Reactivity of 3-Mercaptohexanol in Red Wine: Impact of Oxygen, Phenolic Fractions, and Sulfur Dioxide
|
|
- Sheila Gibson
- 5 years ago
- Views:
Transcription
1 Reactivity of 3-Mercaptohexanol in Red Wine 115 Reactivity of 3-Mercaptohexanol in Red Wine: Impact of Oxygen, Phenolic Fractions, and Sulfur Dioxide Louis Blanchard, 1 Philippe Darriet, 2 * and Denis Dubourdieu 2 Abstract: 3-Mercaptohexanol formed during alcoholic fermentation from an odorless precursor present in grapes can contribute to the fruity aromas of Cabernet Sauvignon, Cabernet franc, and Merlot wines. The concentrations of this compound decreased during aging as a result of oxygen addition each time the wine was handled. 3- Mercaptohexanol decrease did not result from a direct oxidation by oxygen, as the kinetics of 3-mercaptohexanol disappearance in a red wine supplemented with oxygen was delayed compared to the kinetics of oxygen consumption. The implication of wine phenolic compounds in these mechanisms was studied in a model medium. When catechin was dissolved in the presence of oxygen, the 3-mercaptohexanol content decreased more rapidly than in a solution containing only 3-mercaptohexanol and oxygen. Anthocyanins did limit the decrease in 3-mercaptohexanol. The vital role of sulfur dioxide in protecting 3-mercaptohexanol in the model medium and in wines was shown. Key words: oxidation, 3-mercaptohexanol, phenolic compounds, sulfur dioxide Several hundred volatile substances may be involved in the aroma of a red wine. Most are present in all wines, while some are specific or more abundant in wines of particular grape varieties and may contribute to their varietal aroma. For example, the contribution of 2-methoxy-3-isobutylpyrazine to the herbaceous, green pepper aroma at times detected in Cabernet Sauvignon wines has been clearly demonstrated (Allen et al. 1994). Cabernet Sauvignon and Merlot wines, particularly in the Bordeaux area, may develop complex fruity, minty, meaty, or roasted nuances (Peynaud 1980). Several volatile compounds with a thiol function have been identified in red Cabernet Sauvignon and Merlot wines from Bordeaux: 2-mercaptoethyl acetate (Lavigne-Cruège et al. 1997), 3- mercaptohexanol (3MH), 3-mercapto-2-methylpropanol (Bouchilloux et al. 1998a), 2-methyl-3-furanthiol (Bouchilloux et al. 1998b, Kotseridis et al. 2000), furfurylthiol (Tominaga et al. 2000), and ethyl-2-mercaptopropionate (Blanchard 2000). After a specific method for assaying volatile thiols in white wines was developed (Tominaga et al. 1998), the contribution of 3MH and its acetate to the aroma of Sauvignon blanc wines was clearly established. This assay method was later adapted to red wines (Tominaga et al. 1 Seguin Moreau South-America, Seguin-Moreau South America, Las Quilas 4232, Vitacura, Santiago, Chile; 2 Faculté d Oenologie, Université Victor Segalen Bordeaux 2, 351 Cours de la Libération, Talence, France. *Corresponding author [Fax : 33(0) ; philippe.darriet@œnologie.u-bordeaux2.fr] Acknowledgments: The Conseil Interprofessionnel du Vin de Bordeaux (CIVB) and the Conseil Régional d Aquitaine are thanked for funding the research. Manuscript submitted July 2003; revised December 2003 Copyright 2004 by the American Society for Enology and Viticulture. All rights reserved. 2000), making it possible to determine the olfactory impact of these compounds in various Bordeaux wines. It was established that 3MH and furfurylthiol can contribute to the aroma of red Bordeaux wines (Blanchard et al. 1999). More recently, various authors (Murat et al. 2001, Ferreira et al. 2002) have shown that 3MH can play an important role in the fruity aroma of rosé wines obtained from Cabernet Sauvignon, Merlot, and Grenache varieties. In red wines, phenolic compounds, essential for the structure and color of red wines, are particularly reactive with oxygen. These reaction mechanisms play a decisive role in wine development, particularly in stabilizing coloring matter through the formation of cross-linking of tannins and anthocyanins in the presence of ethanal as well as the polymerization mechanisms that result in tannin formation (Haslam 1966, Timberlake et al. 1976, Glories 1978, Escribano-Bailon et al. 1996, Es Safi 1999). Sulfur compounds with thiol function are also highly reactive compounds, easily oxidized to disulfides with metals, particularly iron and copper, at trace concentrations (Jocelyn 1972). Moreover, their nucleophilic properties produce numerous addition reactions, and, in enology, reactions involving nonvolatile or volatile thiols in grape juice with oxidized phenolic compounds have been reported (Singleton et al. 1984, Cheynier et al. 1986, Ribéreau-Gayon et al. 1999a,b). Recently, Murat et al. (2003) have demonstrated the stabilization of a volatile thiol, 3MH, in the presence of anthocyanins in model medium. This article presents the incidence of some technological aspects during red wine aging on the evolution of 3MH concentration and focuses on the impact of oxygen and sulfur dioxide on the 3MH content in the presence of various phenolic fractions isolated from wine. 115
2 116 Blanchard et al. Materials and Methods Reagents and solutions. Catechin (hydrate form, 98% pure) was provided by Fluka (Sigma-Aldrich-Fluka, Saint Quentin Fallavier, France). The anthocyanin fraction was extracted from 5 L of wine sampled at the end of alcoholic fermentation, using the method described by Glories (1978). Hydrogen peroxide (35% w/v) was obtained from Acros (Noisy le Grand, France). The sulfur dioxide was a 10% (w/ v) potassium bisulfite solution (Laffort, Bordeaux, France). 3-Mercaptohexanol (99% pure) was from Interchim (Montluçon, France). 3-Methylthiohexan-1-ol (99.5% pure) was from Oxford Chemicals (Hartlepool, UK). Wine samples. The wines were from several appellations in the Bordeaux area and were made from Cabernet franc, Cabernet Sauvignon, and Merlot grapes. They were vinified in stainless steel vats for alcoholic fermentation and malolactic fermentation, then poured into barrels after malolactic fermentation, and racked every three months by pumping from one barrel to another. Samples were taken at different stages in the winemaking process (after alcoholic fermentation and malolactic fermentation in stainless steel vats and during aging in oak barrels). Samples were taken from vats as soon as the wine had been homogenized (postfermentation) or from a series of three barrels (during aging); contact with air was avoided. The 3MH content was assayed one week after sampling. During aging, the free sulfur dioxide content in the wine was controlled at 30 mg/l (± 5 mg/l), using the Ripper method (OIV 1990). Samples were stored in corked bottles. 3MH assay in wine and model media. The 3MH content of the red wines was assayed using the method described by Tominaga et al. (2000). Reproducibility of the 3MH assay was better than 5%. After incubations in the model media, the internal standard used in Tominaga et al. (2000) method (1-methoxy-3- mercapto-3-methylbutane:1,3,3-mmb) was not used in the assay due to its possible degradation by peroxides or reaction with oxidized phenolic compounds. An alternative assay using an external standard, 3-methylthio-1-hexanol (0.1 mmol added), was developed according to the protocol proposed by Murat et al. (2003). Repeatability of the 3MH assay, determined by calculation from Murat et al. (2003) results, was better than 7%. Free anthocyanin assay. The free anthocyanins were assayed using the method described by Ribéreau-Gayon and Stonestreet (1965). Racking protocols in the cellar. Three racking modalities were used: racking from one barrel to another (protocol 1); racking as in protocol 1 but with nitrogen in the reception barrel (protocol 2); and racking from one barrel to a small vat and again to the barrel (protocol 3). The control sample was not racked. The oxygen content was measured with a Clark electrode (OxyGuard Handy MKII, Birkeroed, Denmark). Wine sampling and oxygen measurements during kinetic studies. A 5-L sample of red wine, taken at the beginning of aging in vat, was supplemented with oxygen (99.9% purity; Air Liquide, Floirac, France) up to a level of 5 mg/l dissolved oxygen (at 20 C), and placed in a hermetically sealed flask under a nitrogen blanket. Samples were taken using nitrogen counter-pressure. Dissolved oxygen was measured using a Clark electrode, submerged in the wine at all times. In this case, the 3MH assay was carried out immediately after sampling. Constitution of model wines with different phenolic fractions. A model wine with a similar composition to wine (ultrapure water [MilliQ, Millipore]/ethanol [88:12 v/v]; 5 g/ L tartaric acid, ph 3.5) was kept under a nitrogen stream until the dissolved oxygen content was as low as possible. Iron and copper concentrations in the medium were less than 1 µg/l. 3MH at 1000 ng/l was then added to the solution. Partially purified anthocyanins (200 mg/l) or catechin (500 mg/l) were added in the presence (4.7 mg/l dissolved oxygen) or absence of oxygen, with or without sulfur dioxide (30 mg/l). After homogenization, the model wines were placed, under nitrogen atmosphere, into bottles (500 ml), hermetically sealed (first-quality corks), and kept in the dark at 20 C. After one week, each sample was assayed twice for 3MH content and oxygen consumed. Results and Discussion Determination of 3MH content during vinification and barrel aging. The 3MH content in young wines can be considerably higher than the olfactory perception threshold (60 ng/l in model wine with a similar composition to wine) (Tominaga et al. 1998), just after alcoholic and malolactic fermentation (Table 1). The 3MH content was also usually higher than the olfactory perception threshold in older vintages analyzed, indicating that this compound can contrib- Table 1 3-Mercaptohexanol (3MH) content in nine Bordeaux red wines. Controlled appellation a Vintage Grape variety b 3MH (ng/l) Aromatic index c Montagne St Emilion (end AF) % Cf Graves (end AF) % CS St Estèphe (end MLF) % M Côtes de Bordeaux (end MLF) % CS Graves % CS 20% M Saint Estèphe % M 50% CS Pauillac % CS 20% M Saint Julien % CS 20% M Pomerol % M <60 <1 a AF: alcoholic fermentation; MLF: malolactic fermentation. b Cf: Cabernet franc; CS: Cabernet Sauvignon; M: Merlot. c Aromatic index was defined as the ratio between the concentration and the olfactory perception threshold of 3MH in model solution.
3 Reactivity of 3-Mercaptohexanol in Red Wine 117 Table 2 Evolution of 3MH content in red wines during barrel aging (Cabernet Sauvignon, Pessac Leognan, 1996 and 1998) after alcoholic fermentation (AF). Days 3MH after AF (ng/l) C. Sauvignon, C. Sauvignon, Table 3 Incidence of oxygen level incorporation on 3MH content in red wines (Cabernet Sauvignon, Pessac Leognan, 1996 and 1998) MH Dissolved O 2 3MH Dissolved O 2 Assay (ng/l) (mg/l) (ng/l) (mg/l) Control sample Protocol Protocol Protocol ute to the fruity aromas of red Merlot, Cabernet franc, and Cabernet Sauvignon wines. The 3MH content of red Bordeaux wines from the 1996 and 1998 vintages was monitored during barrel aging (Table 2). Concentrations were high at the end of alcoholic fermentation and decreased gradually during the winemaking and aging process. Concentrations at the end of aging were only 22% and 27% of those measured just after alcoholic fermentation. The incidence of oxygen incorporation on 3MH evolution was assessed, particularly during transfer operations (racking). Red wines aged in oak barrels (1996 and 1998 vintages) were subjected to three levels of added oxygen, corresponding to different racking techniques (Table 3). After one week, wines were sampled and 3MH concentrations in wines from different modalities were determined. In oxygenated wines, 3MH content was systematically lower than that of the non-oxygenated wine (Table 3). Protocol 1 (2.2 mg/l dissolved oxygen) induced a decrease between 24 and 25% in the 3MH content; protocol 2 (0.5 mg/l dissolved oxygen) induced a decrease between 9 to 17%. 3MH concentrations were noticeably higher than those in the wine supplemented with the highest quantities of dissolved oxygen in protocol 3, which had a 62% decrease. Impact of oxygen and on reactivity of 3MH with phenolic compounds. To identify the mechanisms responsible for the decrease in 3MH in the presence of oxygen, the evolution kinetics of 3MH and dissolved oxygen in a red wine were monitored in the laboratory (Figure 1). The dissolved oxygen content in the wine decreased rapidly, stabilizing at 0.5 mg/l after 48 hr (Figure 1), while the 3MH content started to decrease only after 48 hr, with a 30% decrease by the end of the experiment (168 hr, 7 days). The kinetics of the decrease in oxygen and 3MH were not the same, as the 3MH content started to decrease only when the oxygen content had stabilized. Therefore, the decrease in 3MH was not directly linked to dissolved oxygen and was probably due to other molecules present in red wines Figure 1 Monitoring the evolution of 3MH and oxygen contents in red wine (Côtes de Bordeaux, 1998) (oxygen initial content, 5 mg/l). that react more readily with oxygen than thiols. Their reactivity in oxidized form might have been responsible for the decrease in 3MH. A model wine containing 1000 ng/l 3MH, was supplemented with different grape phenolic compounds at concentrations close to those found in the wines (Table 4). After seven days, the 3MH content in the control solution without added oxygen had dropped by 33%. The addition of oxygen (4.7 mg/l) caused a further 25% decrease in the 3MH content (a total decrease of 49%), although little oxygen was consumed (0.3 mg/l). In contrast, the addition of (30 mg/l) significantly attenuated the decrease in 3MH, producing an additional decrease of only 8% (a total of 38%), with 0.9 mg/l oxygen consumed in seven days. The standard model wine consistently contained low quantities of dissolved oxygen (approximately 0.2 mg/l), and after seven days 0.05 to 0.1 mg/l oxygen remained in the solution. Volatile thiols have been reported not to oxidize easily in the presence of oxygen, but oxidation may be catalyzed by trace amounts of metal ions (iron, copper) (Jocelyn 1972). The presence of metals at concentrations less than 1 µg/l in the model solution cannot be ruled out. It is therefore probable that the decrease in 3MH in the control was due to the aforementioned reaction mechanisms. These same mechanisms might also explain the decrease in 3MH in the presence of larger quantities of oxygen (4.7 mg/l). In the presence of 10 mg/l hydrogen peroxide, corresponding to the concentration of molecular oxygen initially incorporated in the medium (4.7 mg/l), the 3MH content decreased by over 60% (a total decrease of 73%), compared
4 118 Blanchard et al. to the solution kept without oxygen for seven days. This result confirms that thiols are easily oxidized by peroxides (Jocelyn 1972). There was a considerably greater decrease in 3MH in the presence of catechin and oxygen (65% decrease; total decrease 76%) than in the absence of oxygen (only a 31% decrease; total decrease 54%). Another assay, performed in duplicate, with a 10-fold 3MH concentration has shown a greater decrease of this compound in the presence of oxygen and catechin than in the presence of oxygen (a 46% decrease with catechin and oxygen versus a 33% decrease with oxygen). Catechin is likely to oxidize to quinone when exposed to air (Haslam 1966, Singleton 1987). o-quinones are powerful oxidizing agents and strongly electrophilic (Singleton 1987) and they can easily react with thiols by a Michael addition reaction (Cheynier et al. 1986). By a series of coupled reactions, o-quinones can also generate peroxides (Timberlake et al. 1976, Wildenradt and Singleton 1974) known for their oxidative properties against thiols. The disappearance of 3MH in the presence of catechin and oxygen could be due to one or the other mechanism or both. Adding in the presence of catechin significantly attenuated the decrease in thiol content (Table 4), which is consistent with both hypotheses. This observation agrees with having a synergistic antioxidant effect on catechin, as indicated by Saucier and Waterhouse (1999), and with antioxidant properties of against peroxides. This decrease in thiol content may also be explained by the fact that reduces quinone forms of catechin, avoiding reaction of the quinone with thiols. The decrease in 3MH content observed in the catechin solution without oxygen might be due to the presence of peroxides or quinone forms of catechin in the commercial extract. As noticed previously, this decrease did not occur when was present (Table 4). The 3MH content in the solution containing 200 mg/l anthocyanin without added oxygen decreased by only 10%, a much lower decrease than in the control solution (Table 4). This finding was also observed by Murat et al. (2003). Adding oxygen induced a total 25 % decrease of 3MH concentration after seven days (Table 4), and in the presence of and oxygen, the 3MH content after seven days was only slightly lower than it was initially (10% total decrease). The addition of anthocyanins attenuated the decrease in volatile thiols, which is paradoxical considering the oxygen consumed in the solution containing anthocyanins (between 2.2 and 2.3 mg/l) but consistent with the antioxidant properties usually associated with anthocyanins (Ghiselli et al. 1998). Adding in the presence of anthocyanins and oxygen attenuated the decrease in the 3MH content that occurred when oxygen was added. It could be due to the antioxidant effect of sulfur dioxide against peroxides potentially produced by oxidation of anthocyanins. Another hypothesis is that reduced the quinonic and semiquinonic forms of cyanidin-3-glucoside and delphinidin-3-glucoside, which might react with the thiols. These results reveal a synergy between and anthocyanins in stabilizing 3MH in the model wine. To complement previous studies, the incidence of free levels on the evolution of 3MH in red wines supplemented with oxygen (5 mg/l) was evaluated. Free content varied between 13 and 40 mg/l (Table 5). After seven days, there was only a limited decrease in the 3MH concentration in wines with a high free content. The decrease was much greater when free content was low (Table 5). In another experiment, ph value was modified in the same red wines by adding potassium hydroxide and 3MH content was measured 7 or 15 days after oxygen incorporation (Table 6). 3MH content consistently decreased in wines at low free content (Table 6). However, no significant decrease in 3MH content may be established, in relation to the ph value of the wines. Table 4 Evolution of 3MH content and dissolved oxygen in model wines with added phenolic fractions, and O 2 after seven days conservation at 20 C. Sample 3MH Initial dissolved O 2 O 2 consumed (ng/l) (mg/l) (mg/l) Immediate Control nd a After seven days Control Sample + O Sample + O Sample + H 2 O nd nd Sample catechin Sample catechin Sample catechin + O Sample catechin + O Sample anthocyanin Sample anthocyanin + O Sample anthocyanin + O a nd: not determined. Table 5 Effect of free levels on 3MH concentration in red wines in the presence of dissolved oxygen after seven days. Storage time Free 3MH in Initial 3MH (days) (mg/l) wine (ng/l) content (%) Wine Wine Wine Wine Wine Wine Wine Wine Wine
5 Reactivity of 3-Mercaptohexanol in Red Wine 119 Table 6 Effect of free level and ph on 3MH concentration in red wines in the presence of dissolved oxygen after 7 days (wine A) or 15 days (wine B). Storage time Free ph 3MH in Initial 3MH (days) (mg/l) wine (ng/l) content (%) Sample control (no oxygen incorporated) Sample A Sample A Sample A Sample A Sample control (no oxygen incorporated) Sample B Sample B Sample B Sample B These findings suggest the important role played by sulfur dioxide, as it protects the volatile thiols of red wines, and highlight antioxidant properties of described by Pontallier (1981) and Laborde (1987) in relation to the varietal aroma components of a wine. Conclusion Concentrations much higher than the olfactory perception threshold of 3-mercaptohexanol, a thiol of varietal origin, were found frequently in Merlot, Cabernet franc, and Cabernet Sauvignon wines at the end of alcoholic fermentation. These concentrations decreased during malolactic fermentation and barrel aging. By the end of aging, the wines contained only a low percentage of the 3MH formed during alcoholic fermentation. Oxygen dissolved in the wine during various handling operations led to a decrease in the 3MH content of the red wine. However, this decrease of 3MH was delayed relative to that of oxygen consumption in the wine. Preliminary results indicate that phenolic fractions derived from grapes (anthocyanin and catechin) influence the evolution of 3MH content in a model solution in the presence of oxygen. The disappearance of 3MH with catechin in the presence of oxygen was demonstrated as well as the fact that this mechanism can be partially inhibited by adding sulfur dioxide. A synergistic effect of sulfur dioxide and anthocyanins in the stabilization of 3MH was found. In a model wine, the combination of anthocyanins and sulfur dioxide reduced the oxidative decrease of 3MH. Results also confirmed the importance of sulfur dioxide in winemaking, particularly its protective effect in relation to the oxidation phenomena responsible for the decrease in 3MH. A high level of free diminished the decrease in 3MH during handling operations, thus preserving the fruity aromas in red wines provided by this compound. Literature Cited Allen, M.S., M.J. Lacey, and S. Boyd Determination of methoxypyrazines in red wines by stable isotope dilution gas chromatography-mass spectrometry. J. Agric. Food Chem. 42: Blanchard, L Recherche sur la contribution de certains thiols à l arôme des vins rouges: Etude de leur genèse et de leur stabilité. Thesis, Université Victor Segalen Bordeaux 2. Blanchard, L., P. Bouchilloux, P. Darriet, T. Tominaga, and D. Dubourdieu Caractérisation de la fraction volatile de nature soufrée dans les vins de Cabernet et de Merlot. Etude de son évolution au cours de l élevage en barrique. In Sixth Symposium International d Œnologie de Bordeaux. A. Lonvaud (Ed.), pp Tec & Doc, Paris. Bouchilloux, P., P. Darriet, R. Henry, V. Lavigne Cruège, and D. Dubourdieu. 1998a. Identification of volatile and powerful odorous thiols in Bordeaux red wine varieties. J. Agric. Food Chem. 46: Bouchilloux, P., P. Darriet, and D. Dubourdieu. 1998b. Identification du 2-methyl-3-furanthiol dans les vins. Vitis 37: Cheynier, V., E.K. Trousdale, V.L. Singleton, M. Salgues, and R. Wylde Characterization of 2-S-glutathionyl caftaric acid and its hydrolysis in relation to grape wines J. Agric. Food Chem. 34: Escribano-Bailon, M.T., O. Dangles, and R. Brouillard Coupling reaction between flavylium ion and catechin. Phytochemistry 35: Es Safi, N.E., H. Fulcrand, V. Cheynier, and M. Moutounet Studies on the acetaldehyde-induced condensation of (-)-epicatechin and malvidin-3-o-glucoside in a model solution system. J. Agric. Food Chem. 47: Ferreira, V., N. Ortin, A. Escudero, R. Lopez, and J. Cacho Chemical characterization of the aroma of Grenache rosé wines: Aroma extract dilution analysis, quantitative determination, and sensory reconstitution studies. J. Agric. Food Chem. 50: Ghiselli, A., M. Nardini, A. Balbi, and C. Scaccini Antioxidant activity of different phenolic fractions separated from an Italian red wine. J. Agric. Food. Chem. 46:
6 120 Blanchard et al. Glories, Y Recherche sur la matière colorante des vins rouges. Thesis, Université Bordeaux 2. Haslam, E Chemistry of Vegetable Tannins, pp Academic Press, London. Jocelyn, P.C Biochemistry of the SH Group, pp Academic Press, London. Kotseridis, Y., and R. Baumes Identification of impact odorants in Bordeaux red grape juice, in the commercial yeast used for its fermentation, and in the produced wine. J. Agric. Food. Chem. 48: Laborde, J.L Contribution à l étude des phénomènes d oxydation dans les vins rouges. Rôle de l anhydride sulfureux. Thesis, Université de Bordeaux 2. Lavigne-Cruège, V., R. Henry, and D. Dubourdieu Identification et dosage de composés soufrés intervenant dans l arôme grillé des vins. Sci. Aliments 18: Murat, M.L., T. Tominaga, and D. Dubourdieu Mise en évidence de composés clefs dans l arôme des vins rosés et clairés de Bordeaux. J. Int. Sci. Vigne Vin 35: Murat, M.L., T. Tominaga, C. Saucier, Y. Glories, and D. Dubourdieu Effect of anthocyanins on stability of a key odorous compound, 3-mercaptohexan-1-ol, in Bordeaux rosé wines. Am. J. Enol. Vitic. 54: Peynaud, E Le goût du vin. Dunod, Paris. Pontallier, P Recherche sur les conditions d élevage des vins rouges. Rôle des phénomènes oxydatifs. Thesis, Université de Bordeaux 2. Office International de la Vigne et du Vin Recueil des méthodes d analyses. OIV, Paris. Ribéreau-Gayon, P., and E. Stonestreet Dosage des anthocyanes dans les vins rouges. Bull. Soc. Chim Ribéreau-Gayon, P., D. Dubourdieu., B. Donèche, and A. Lonvaud. 1999a In Handbook of Enology. Vol. 1. The Microbiology of Wine and Vinifications, pp Wiley & Sons, London. Ribéreau-Gayon, P., Y.Glories, A. Maujean, and D. Dubourdieu. 1999b. In Handbook of Enology. Vol. 2. The Chemistry of Wine Stabilizations and Treatments, pp Wiley & Sons, London. Saucier, C., and A.L. Waterhouse Synergic activity of catechin and other antioxidants. J. Agric. Food Chem. 47: Singleton, V.L Oxygen with phenols. Am. J. Enol. Vitic. 38: Singleton, V.L., J. Zaya, E.K. Trousdale, and M. Salgues Caftaric acid in grapes and the conversion to a reaction product during processing. Vitis 23: Timberlake, C.F., and P. Brindle Interaction between anthocyanins, phenolic compounds, and acetaldehyde and their significance in red wines. Am. J. Enol. Vitic. 27: Tominaga, T., M.L. Murat, and D. Dubourdieu Development of a method for analyzing the volatile thiols involved in the characteristic aroma of wines made from Vitis vinifera L. cv. Sauvignon blanc. J. Agric. Food Chem. 46: Tominaga, T., L. Blanchard, P. Darriet, and D. Dubourdieu A powerful aromatic volatile thiol, 2-furanmethanethiol, exhibiting roast coffee aroma in wines made from several Vitis vinifera grape varieties. J. Agric. Food Chem. 48: Wildenradt, H.L., and V.L. Singleton The production of aldehydes as a result of oxidation of polyphenolic compounds and its relation to wine aging. Am. J. Enol. Vitic. 25:
Takatoshi Tominaga,* Marie-Laure Murat, and Denis Dubourdieu
1044 J. Agric. Food Chem. 1998, 46, 1044 1048 Development of a Method for Analyzing the Volatile Thiols Involved in the Characteristic Aroma of Wines Made from Vitis vinifera L. Cv. Sauvignon Blanc Takatoshi
More informationTechnical note. How much do potential precursor compounds contribute to reductive aromas in wines post-bottling?
Technical note How much do potential precursor compounds contribute to reductive aromas in wines post-bottling? Introduction The formation of unpleasant reductive aromas in wines is an issue of concern
More informationAN ENOLOGY EXTENSION SERVICE QUARTERLY PUBLICATION
The Effects of Pre-Fermentative Addition of Oenological Tannins on Wine Components and Sensorial Qualities of Red Wine FBZDF Wine. What Where Why How 2017 2. October, November, December What the authors
More informationTiming of Treatment O 2 Dosage Typical Duration During Fermentation mg/l Total Daily. Between AF - MLF 1 3 mg/l/day 4 10 Days
Micro-Oxygenation Principles Micro-oxygenation is a technique that involves the addition of controlled amounts of oxygen into wines. The goal is to simulate the effects of barrel-ageing in a controlled
More informationQuinone Reactions in Wine Oxidation
Chapter 18 Quinone Reactions in Wine Oxidation Andrew L. Waterhouse *,1 and Maria Nikolantonaki 2 Downloaded by UNIV OF CALIFORNIA DAVIS on December 2, 2015 http://pubs.acs.org 1Department of Viticulture
More informationOregon Wine Advisory Board Research Progress Report
Page 1 of 7 Oregon Wine Advisory Board Research Progress Report 1997-1998 Fermentation Processing Effects on Anthocyanins and Phenolic Composition of Oregon Pinot noir Wines Barney Watson, Naomi Goldberg,
More informationWine Aging and Monitoring Workshop On-Line References
College of Agriculture and Life Sciences Food Science and Technology Dr. Bruce W. Zoecklein Wine/Enology-Grape Chemistry Group Blacksburg, Virginia 24061 540/231-5325 Fax: 540/231-9293 Email: bzoeckle@vt.edu
More informationNon-Microbial Off Aromas
Non-Microbial Off Aromas Oxidation Prevention: Reduce oxygen exposure SO 2 Hyper-oxidation (for some whites) Control for metals (Cu, Fe) Enartis Pro FT, other thiols Control for oxidation of phenolic compounds
More informationPremature ageing of wine aromas. Pr Denis Dubourdieu, Dr Alexandre Pons and Dr Valérie Lavigne
Premature ageing of wine aromas Pr Denis Dubourdieu, Dr Alexandre Pons and Dr Valérie Lavigne 1 2 # CITATIONS Premox or not Premox When Premox phenomenon shake the web That is the question 4000 3500 3000
More informationWHITE GRAPE MUST OXYGENATION: SET UP AND SENSORY EFFECT
LAGARDE-PASCAL ET AL., WHITE GRAPE MUST OXYGENATION: SET UP AND SENSORY EFFECT, PAG. 1 WHITE GRAPE MUST OXYGENATION: SET UP AND SENSORY EFFECT Christine LAGARDE-PASCAL et Laurent FARGETON Vivelys SAS,
More information5/13/16. Oxygen Depletion. Wine Oxidation Reactions. Consumed SO2 Versus Consumed O2 in Bottle Aging
5/13/16 Wine Flavor 101C: Managing Oxygen for Wine Composition and Stability Consumed Versus Consumed O2 in Bottle Aging Annegret Cantu Professor A.L. Waterhouse Oxygen Depletion Wine has an inherent ability
More informationSTUDIES ON THE CHROMATIC CHARACTERISTICS OF RED WINES AND COLOR EVOLUTION DURING MATURATION
Scientific Bulletin. Series F. Biotechnologies, Vol. XVII, 2013 ISSN 2285-1364, CD-ROM ISSN 2285-5521, ISSN Online 2285-1372, ISSN-L 2285-1364 STUDIES ON THE CHROMATIC CHARACTERISTICS OF RED WINES AND
More informationUNDERSTANDING FAULTS IN WINE BY JAMIE GOODE
FLAWLESS UNDERSTANDING FAULTS IN WINE BY JAMIE GOODE Contents Table 1 3 Table 2 4 Table 3 5 Table 4 8 table 1 Percentage of SO 2 in the Molecular Form at Different ph Levels ph Molecular SO 2 2.9 7.5 3.0
More informationCopper, the good, the bad, the ugly. Dr Eric Wilkes
Copper, the good, the bad, the ugly Dr Eric Wilkes Why do we use copper at all? Copper has a long history of use in beverage production to remove unpleasant sulfur related smells. Analysis of 80,000 international
More informationNomaSense PolyScan. Analysisof oxidizable compounds in grapes and wines
NomaSense PolyScan Analysisof oxidizable compounds in grapes and wines Oxidizablecompounds GSH SO 2 Reaction with volatile sulfur compounds Reaction with amino acids Loss of varietal thiols Modulation
More informationWinemaking and Sulfur Dioxide
Winemaking and Sulfur Dioxide Prepared and Presented by: Frank Schieber, Amateur Winemaker MoundTop MicroVinification Vermillion, SD www.moundtop.com schieber@usd.edu Outline: Sulfur Dioxide (Free SO 2
More informationVWT 272 Class 7. Quiz 5. Number of quizzes taken 19 Min 2 Max 30 Mean 19.5 Median 23 Mode 24
VWT 272 Class 7 Quiz 5 Number of quizzes taken 19 Min 2 Max 30 Mean 19.5 Median 23 Mode 24 Lecture 7 Other (Smelly) Sulfur Compounds He that lives upon hope will die farting. Benjamin Franklin (1706-1790)
More informationOregon Wine Advisory Board Research Progress Report
Grape Research Reports, 1996-97: Fermentation Processing Effects on Anthocyanin and... Page 1 of 10 Oregon Wine Advisory Board Research Progress Report 1996-1997 Fermentation Processing Effects on Anthocyanin
More informationOak and Grape Tannins: The Trouble with Tannins. J. Harbertson Washington State University
Oak and Grape Tannins: The Trouble with Tannins J. Harbertson Washington State University Barrel Aging O 2 ph Heat Oak Tannins Grape Tannins The Aging Process Wines get Less Astringent as they age? The
More informationActa Chimica and Pharmaceutica Indica
Acta Chimica and Pharmaceutica Indica Research Vol 7 Issue 2 Oxygen Removal from the White Wine in Winery VladimirBales *, DominikFurman, Pavel Timar and Milos Sevcik 2 Faculty of Chemical and Food Technology,
More informationInfluence of climate and variety on the effectiveness of cold maceration. Richard Fennessy Research officer
Influence of climate and variety on the effectiveness of cold maceration Richard Fennessy Research officer What is pre-fermentative cold maceration ( cold soak ) and what are the benefits? Introduction
More informationChristian Butzke & Jill Blume enology.butzke.com
Christian Butzke & Jill Blume butzke@purdue.edu 765.494.6500 enology.butzke.com Chemistry Sensory Causes Prevention-Management-Removal Reduction Oxidation Volatile Acidity Nailpolish Brettanomyces Buttery
More informationVarietal Specific Barrel Profiles
RESEARCH Varietal Specific Barrel Profiles Beaulieu Vineyard and Sea Smoke Cellars 2006 Pinot Noir Domenica Totty, Beaulieu Vineyard Kris Curran, Sea Smoke Cellars Don Shroerder, Sea Smoke Cellars David
More informationMeasuring Sulfur Dioxide: A Perennial Issue. Tom Collins Fosters Wine Estates Americas
Measuring Sulfur Dioxide: A Perennial Issue Tom Collins Fosters Wine Estates Americas 5 February 2010 Measuring SO 2 : A Perennial Issue In the collaborative proficiency testing program managed by ASEV
More informationCOOPER COMPARISONS Next Phase of Study: Results with Wine
COOPER COMPARISONS Next Phase of Study: Results with Wine A follow-up study has just been completed, with the generous cooperation of Cakebread Cellars, Lafond Winery, and Edna Valley Vineyards. Many of
More informationRELEASE OF FUNCTIONAL POLYSACCHARIDES BY WINE YEAST AND THEIR INTERACTION WITH WINE POLYPHENOLS
ESCOT EL AL., YEAST POLYSACCRAIDE INTERACTIONS WITH WINE POLYPHENOLS PAGE 1 RELEASE OF FUNCTIONAL POLYSACCHARIDES BY WINE YEAST AND THEIR INTERACTION WITH WINE POLYPHENOLS S. ESCOT (1), M. FEUILLAT (1),
More informationVWT 272 Class 10. Quiz 9. Number of quizzes taken 24 Min 11 Max 30 Mean 26.5 Median 28 Mode 30
VWT 272 Class 10 Quiz 9 Number of quizzes taken 24 Min 11 Max 30 Mean 26.5 Median 28 Mode 30 Lecture 10 Some Chemical Structures and the Sulfur Dioxide Family The difference between professional winemakers
More informationVarietal thiols in wines : a review on their aromatic contribution and their liberation mechanisms from their precursors
Varietal thiols in wines : a review on their aromatic contribution and their liberation mechanisms from their precursors Dr. Rémi SCHNEIDER Sulfur containing compounds a devilish universe? origin Mean
More informationPractical actions for aging wines
www.-.com Practical actions for aging wines document. Professional use not allowed (training, copy, publication, commercial document, etc.) without written D. s authorization Thirteen main key-points for
More informationCold Stability, CMCs and other crystallization inhibitors.
Cold Stability, CMCs and other crystallization inhibitors. Dr Eric Wilkes Group Manager Commercial Services Tartrate instability The deposit is harmless, but the customers reaction might not be.potassium
More informationGrapes, the essential raw material determining wine volatile. composition. It s not just about varietal characters.
Grapes, the essential raw material determining wine volatile composition. It s not just about varietal characters. Paul Boss and Eric Dennis Food Futures Flagship and CSIR Plant Industry, P Box 350 Glen
More informationVirginie SOUBEYRAND**, Anne JULIEN**, and Jean-Marie SABLAYROLLES*
SOUBEYRAND WINE ACTIVE DRIED YEAST REHYDRATION PAGE 1 OPTIMIZATION OF WINE ACTIVE DRY YEAST REHYDRATION: INFLUENCE OF THE REHYDRATION CONDITIONS ON THE RECOVERING FERMENTATIVE ACTIVITY OF DIFFERENT YEAST
More informationEFFECTS OF SELECTED VITICULTURAL AND ENOLOGICAL FACTORS ON LEVELS OF 2-METHOXY 3-ISOBUTYLPYRAZINE IN WINES
EFFECTS OF SELECTED VITICULTURAL AND ENOLOGICAL FACTORS ON LEVELS OF 2-METHOXY 3-ISOBUTYLPYRAZINE IN WINES EFFETS DE CERTAINS FACTEURS VITICOLES ET ŒNOLOGIQUES SUR LES TENEURS EN 2-MÉTHOXY-3-ISOBUTYLPYRAZINE
More informationdistinct category of "wines with controlled origin denomination" (DOC) was maintained and, in regard to the maturation degree of the grapes at
ABSTARCT By knowing the fact that on an international level Romanian red wines enjoy a considerable attention, this study was initiated in order to know the possibilities of obtaining in Iaşi vineyard
More informationReduction Redux The Good, the Bad and the Nutty. The closure issues. Presented by Adrian Coulter Senior Oenologist AWRI
Reduction Redux The Good, the Bad and the Nutty The closure issues Presented by Adrian Coulter Senior Oenologist AWRI 1999 Semillon wine bottled using 14 different closures Range of color 28 months after
More informationHarvest Series 2017: Wine Analysis. Jasha Karasek. Winemaking Specialist Enartis USA
Harvest Series 2017: Wine Analysis Jasha Karasek Winemaking Specialist Enartis USA WEBINAR INFO 100 Minute presentation + 20 minute Q&A Save Qs until end of presentation Use chat box for audio/connection
More informationRED WINE VINIFICATION, RAPID-EXPANSION (PART B)
ESCUDIER RAPID EXPANSION PART B ARTICLE 2 OF 5 PAGE 1 RED WINE VINIFICATION, RAPID-EXPANSION (PART B) Jean-Louis ESCUDIER INRA, UE Œnologie, IPV-ISSV Pech Rouge, 11430 Gruissan NOTE: THIS IS THE SECOND
More informationGUIDE TANNINS TECHNOLOGICAL
www.martinvialatte.com TANNINS GUIDE TECHNLGICAL To fully understand the use of tannins it is above all necessary to understand their properties and their significance for musts and wines. Gallotannin
More informationIncreasing Toast Character in French Oak Profiles
RESEARCH Increasing Toast Character in French Oak Profiles Beaulieu Vineyard 2006 Chardonnay Domenica Totty, Beaulieu Vineyard David Llodrá, World Cooperage Dr. James Swan, Consultant www.worldcooperage.com
More informationEffects of Capture and Return on Chardonnay (Vitis vinifera L.) Fermentation Volatiles. Emily Hodson
Effects of Capture and Return on Chardonnay (Vitis vinifera L.) Fermentation Volatiles. Emily Hodson Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University in partial
More informationTESTING WINE STABILITY fining, analysis and interpretation
TESTING WINE STABILITY fining, analysis and interpretation Carien Coetzee Stephanie Steyn FROM TANK TO BOTTLE Enartis Stabilisation School Testing wine stability Hazes/colour/precipitate Oxidation Microbial
More informationVWT 272 Class 14. Quiz 12. Number of quizzes taken 16 Min 3 Max 30 Mean 21.1 Median 21 Mode 23
VWT 272 Class 14 Quiz 12 Number of quizzes taken 16 Min 3 Max 30 Mean 21.1 Median 21 Mode 23 Lecture 14 Phenolics: The Dark Art of Winemaking Whether at Naishapur or Babylon, Whether the Cup with sweet
More informationInfluence of Technological Operations in the Dissolved Oxygen Content of Wines
J. Chem. Chem. Eng. 8 (2014) 390-394 D DAVID PUBLISHING Influence of Technological Operations in the Dissolved Oxygen Content of Wines Ana Catarino 1, Sandra Alves 2 and Helena Mira 1* 1. Polytechnic Institute
More informationMAKING WINE WITH HIGH AND LOW PH JUICE. Ethan Brown New Mexico State University 11/11/2017
MAKING WINE WITH HIGH AND LOW PH JUICE Ethan Brown New Mexico State University 11/11/2017 Overview How ph changes during winemaking Reds To adjust for high ph and how Whites Early harvest due to poor conditions
More informationWinemaking Summarized
Prevention of Common Wine Faults Luke Holcombe 707-790-3601 cell lukeh@scottlab.com Winemaking Summarized 1 What are the most Common Faults? Oxidation Volatile Sulfur Compounds (VSC) Microbial Faults Protein
More informationREPORT. Virginia Wine Board. Creating Amarone-Style Wines Using an Enhanced Dehydration Technique.
REPORT Virginia Wine Board Creating Amarone-Style Wines Using an Enhanced Dehydration Technique. Principal Investigators: Molly Kelly, Enology Extension Specialist Virginia Tech Department of Food Science
More informationTHE DIVERSE FUNCTIONS OF OXYGEN 2 ND PART
DELTEIL, THE DIVERSE FUNCTIONS OF OXYGEN. 2 ND PART, 1 THE DIVERSE FUNCTIONS OF OXYGEN 2 ND PART Dominique DELTEIL. Scientific Director ICV 1 Protecting white and rosé wines from the last quarter of the
More informationThe Importance of Dose Rate and Contact Time in the Use of Oak Alternatives
W H I T E PA P E R The Importance of Dose Rate and Contact Time in the Use of Oak Alternatives David Llodrá, Research & Development Director, Oak Solutions Group www.oaksolutionsgroup.com Copyright 216
More informationChristian Butzke Enology Professor.
Christian Butzke Enology Professor butzke@purdue.edu www.indyinternational.org www.indianaquality.org SO 2 & Sorbate Management Oxygen Management Skin Contact Time Residual Nutrients Temperature, ph &
More informationVWT 272 Class 11. Quiz 10. Number of quizzes taken 20 Min 25 Max 30 Mean 29.8 Median 30 Mode 30
VWT 272 Class 11 Quiz 10 Number of quizzes taken 20 Min 25 Max 30 Mean 29.8 Median 30 Mode 30 Lecture 11 Other (Smelly) Sulfur Compounds He that lives upon hope will die farting. Benjamin Franklin (1706-1790)
More informationLAST PART: LITTLE ROOM FOR CORRECTIONS IN THE CELLAR
ROUSSEAU, OCHRATOIN A in WINES LITTLE ROOM FOR CORRECTIONS IN THE CELLAR, PAGE 1 OCHRATOIN A IN WINES: CURRENT KNOWLEDGE LAST PART: LITTLE ROOM FOR CORRECTIONS IN THE CELLAR Jacques Rousseau ICV Viticultural
More informationOxygen Uptake old problem, new solutions
Oxygen Uptake old problem, new solutions Carien Coetzee 31 August 2017 Percentage Rejections % 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Faulty cultivar character 0 0 0 0 0 1 0 1 0 1 0 Microbial
More informationyeast-derived flavours
yeast-derived flavours Positive flavour in some beers - offflavour in others Produced by yeast during fermentation Critically affected by wort [Zn] and yeast health Can also be produced by contaminant
More informationTOASTING TECHNIQUES: Old World and New World RESEARCH. Joel Aiken and Bob Masyczek, Beaulieu Vineyard Maurizio Angeletti, Antinori Winery
RESEARCH TOASTING TECHNIQUES: Old World and New World Joel Aiken and Bob Masyczek, Beaulieu Vineyard Maurizio Angeletti, Antinori Winery www.worldcooperage.com 1 INTRODUCTION In the traditional art of
More informationResearch Note Key Compounds of Provence Rosé Wine Flavor
Research Note Key Compounds of Provence Rosé Wine Flavor Gilles Masson 1 and Rémi Schneider 2 * Abstract: The aromas of French Provence rosé wines were subject to in-depth gas chromatography and sensory
More informationTextbooks: The following textbooks are recommended reading and will be available in the library.
Course Outline BIOC 408 BIOC 408: Enology 2 Professor: Dr. Cedric Saucier Office: FIP 348 Phone: (250) 807 8645 Webct site: www.elearning.ubc.ca e-mail cedric.saucier@ubc.ca Course Description: Advanced
More informationPost-harvest prevention and remediation of ladybug taint
Post-harvest prevention and remediation of ladybug taint Given the significant impact ladybug taint (LBT) can have on wine quality, below is a list of options to consider to assist in reducing LBT if you
More informationBrettanomyces prevention
Brettanomyces prevention Use SO 2 at crush Sanitize or sterilize new barrels Clean surfaces and containers thoroughly Employ microbial monitoring Test all barrels and tanks initially and periodically Filter
More informationD DAVID PUBLISHING. Addition Protocols and Their Effects on Extraction and Retention of Grape Phenolics during Red Wine Fermentation and Aging
Journal of Food Science and Engineering 7 (2017) 472-478 doi: 10.17265/2159-5828/2017.10.002 D DAVID PUBLISHING Addition Protocols and Their Effects on Extraction and Retention of Grape Phenolics during
More information«Precision and homogeneity of barrels selected with OakScan : two examples of selection adapted to different wine profiles or aging objectives»
«Precision and homogeneity of barrels selected with OakScan : two examples of selection adapted to different wine profiles or aging objectives» Nicolas Mourey - October 2015 WWW.RADOUX.FR Introduction
More informationIntroduction to Barrel Profiling
RESEARCH Introduction to Barrel Profiling The Effects of Time and Temperature on Wine Barrel Flavors Tarapacá www.worldcooperage.com 1 OBJECTIVE The objective is to determine if the new Barrel Profiling
More informationHow to fine-tune your wine
How to fine-tune your wine Fining agents help remove undesirable elements or compounds to improve the quality of wine. Fining is not just used in wines for bottle preparation, in some cases there are more
More informationCork as a Closure - Cork as a Closure
Cork as a Closure - Post-bottling reduction, and Permeability performance Prepared for A closer look at cork closures Napa, June 2006 By Dr Alan Limmer Cork as a Closure Post bottling reduction; What is
More informationSensory Quality Measurements
Sensory Quality Measurements Evaluating Fruit Flavor Quality Appearance Taste, Aroma Texture/mouthfeel Florence Zakharov Department of Plant Sciences fnegre@ucdavis.edu Instrumental evaluation / Sensory
More informationMW Exam Review Day. Paper Two. Prepared by Neil Tully MW. 3rd November 2009
MW Exam Review Day Paper Two Prepared by Neil Tully MW 3rd November 2009 Theory Paper Two - This is a technical paper therefore a sound and detailed knowledge of the core syllabus is essential Questions
More informationTHEORY AND APPLICATIONS OF MICRO-OXYGENATION
THEORY AND APPLICATIONS OF MICRO-OXYGENATION Section 2. Micro-Oxygenation and Wine Structure The sensory perception of astringency is due to the interaction between polyphenols and salivary proteins in
More informationROUSSEAU OCHRATOXIN A IN WINES: CURRENT KNOWLEDGE FACTORS FAVOURING ITS EMERGENCE IN VINEYARDS AND WINES PAGE 1
VINEYARDS AND WINES PAGE 1 OCHRATOXIN A IN WINES: CURRENT KNOWLEDGE FIRST PART: FACTORS FAVOURING ITS EMERGENCE IN VINEYARDS AND WINES Jacques Rousseau ICV Viticultural Manager Institut Coopératif du Vin
More informationDetermination of catechins in wines 1 )
Vitis 9, 312-316 (1971) Istituto di Tecnologie Alimentari, Universita di Milano, Italy Determination of catechins in wines 1 ) by C. PoMPEr and C. PERI Introduction The determination of catechins (flavan-3-ols)
More informationYeast strain and nutritional modulation of aroma intensity, longevity and winemaker preference in Sauvignon Blanc wine*
Yeast strain and nutritional modulation of aroma intensity, longevity and winemaker preference in Sauvignon Blanc wine* Paul Bowyer 1, Charlotte Gourraud 2, Marie-Laure Murat 3 and Tertius van der Westhuizen
More informationRISK MANAGEMENT OF BEER FERMENTATION DIACETYL CONTROL
Buletin USAMV-CN, 62/2006 (303-307) ISSN 1454 2382 RISK MANAGEMENT OF BEER FERMENTATION DIACETYL CONTROL Mudura Elena, SevastiŃa Muste, Maria Tofană, Crina Mureşan elenamudura@yahoo.com University of Agricultural
More informationFast Analysis of Smoke Taint Compounds in Wine with an Agilent J&W DB-HeavyWax GC Column
Application Note Flavors and Fragrances Fast Analysis of Smoke Taint Compounds in Wine with an Agilent J&W DB-HeavyWax GC Column Author Vanessa Abercrombie Agilent Technologies, Inc. Abstract The analysis
More informationSO 2 and You: Understanding the When, Why, and How of SO 2 Management in Your Winery. NGP Webinar Tuesday, May 8, 2018
1 SO 2 and You: Understanding the When, Why, and How of SO 2 Management in Your Winery NGP Webinar Tuesday, May 8, 2018 2 Is and Is Not: Demystifying Sulfur Claim: I get headaches from drinking wine, so
More informationSulfur Dioxide Management during Aging Is an Important Factor for the Development of Rosé Wine Color
REPORT Sulfur Dioxide Management during Aging Is an Important Factor for the Development of Rosé Wine Color Caroline P. Merrell 1 and James F. Harbertson 1,2 * Cite this article: Merrell CP and Harbertson
More informationDr. Christian E. BUTZKE Associate Professor of Enology Department of Food Science. (765) FS Room 1261
Dr. Christian E. BUTZKE Associate Professor of Enology Department of Food Science butzke@purdue.edu (765) 494-6500 FS Room 1261 A definition: A variety of interesting odors in wine that depending on their
More informationAn Introduction to StellarTan Premium Tannins. Gusmer June 6, 2018 Windsor, CA
An Introduction to StellarTan Premium Tannins Gusmer June 6, 2018 Windsor, CA Outline General information Berry composition, wine production, tannin extraction, wine composition Tannins Chemistry, perception,
More informationExtract from Technical Notes of Code of Best Practice for Organic Winemaking, produced under the EU FP6 STRIP project ORWINE
ZIRONI ET AL, OXYGEN AND WINE, P. 1 OXYGEN AND WINE Roberto ZIRONI, Piergiorgio COMUZZO, Lata TAT, Sergiu SCOBIOALA Dipartimento di Scienze degli Alimenti, Università degli Studi di Udine, Italy Extract
More informationSULFUR DIOXIDE (SO2) Dr. Bruce Zoecklein
SULFUR DIOXIDE (SO2) Learning Outcomes: The reader will understand the three functions of sulfur dioxide in juice and wine: as an enzyme inhibitor, an antioxidant, and an antimicrobial agent. In the absence
More informationA Study to Determine the Oxygen Status. In Ohio Commercial Wines at Bottling
OHIO AGRICULTURAL RESEARCH AND DEVELOPMENT CENTER A Study to Determine the Oxygen Status In Ohio Commercial Wines at Bottling J.F. Gallander, T.E. Steiner, P.L. Pierquet and L. R. Robbins Department of
More informationGAS-CHROMATOGRAPHIC ANALYSIS OF SOME VOLATILE CONGENERS IN DIFFERENT TYPES OF STRONG ALCOHOLIC FRUIT SPIRITS
GAS-CHROMATOGRAPHIC ANALYSIS OF SOME VOLATILE CONGENERS IN DIFFERENT TYPES OF STRONG ALCOHOLIC FRUIT SPIRITS Vesna Kostik 1*, Shaban Memeti 1, Biljana Bauer 2 1* Institute of Public Health of Republic
More informationDEVELOPMENT OF A RAPID METHOD FOR THE ASSESSMENT OF PHENOLIC MATURITY IN BURGUNDY PINOT NOIR
PINOT NOIR, PAGE 1 DEVELOPMENT OF A RAPID METHOD FOR THE ASSESSMENT OF PHENOLIC MATURITY IN BURGUNDY PINOT NOIR Eric GRANDJEAN, Centre Œnologique de Bourgogne (COEB)* Christine MONAMY, Bureau Interprofessionnel
More informationThe sugar determination in the winemaking process
The sugar determination in the winemaking process Simone Bellassai Enologist and CDR WineLab specialist. Which are the methods commonly used for the sugar analyses in wine or grape juice? Which are their
More informationShort History of Red Wine Color
Chapter 1 Short History of Red Wine Color Downloaded via 148.251.232.83 on June 15, 2018 at 18:15:13 (UTC). See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published
More informationSmoke Taint Update. Thomas Collins, PhD Washington State University
Smoke Taint Update Thomas Collins, PhD Washington State University Wildfires and Wine Overview of smoke taint & the 2017 vintage Review of smoke marker compounds Glycosides of smoke related phenols Risk
More informationEVOLUTION OF PHENOLIC COMPOUNDS DURING WINEMAKING AND MATURATION UNDER MODIFIED ATMOSPHERE
EVOLUTION OF PHENOLIC COMPOUNDS DURING WINEMAKING AND MATURATION UNDER MODIFIED ATMOSPHERE A. Bimpilas, D. Tsimogiannis, V. Oreopoulou Laboratory of Food Chemistry and Technology, School of Chemical Engineering,
More informationDr. Christian E. BUTZKE Associate Professor of Enology Department of Food Science. (765) FS Room 1261
Dr. Christian E. BUTZKE Associate Professor of Enology Department of Food Science butzke@purdue.edu (765) 494-6500 FS Room 1261 Sulfur in Wine Reduced H 2 S hydrogen sulfide S 2- sulfides Oxidized electron-rich
More informationA NEW APPROACH FOR ASSESSING
5 TH YOUNG SCIENTISTS SYMPOSIUM IN MALTING, BREWING AND DISTILLING 21-23 APRIL 2016, CHICO, USA A NEW APPROACH FOR ASSESSING THE INTRINSIC ALDEHYDE CONTENT OF BEER Jessika De Clippeleer, Jeroen Baert,
More informationAddressing Research Issues Facing Midwest Wine Industry
Addressing Research Issues Facing Midwest Wine Industry 18th Annual Nebraska Winery and Grape Growers Forum and Trade Show at the Omaha Marriott March 7 th, 2015 Murli R Dharmadhikari Department of Food
More informationBEEF Effect of processing conditions on nutrient disappearance of cold-pressed and hexane-extracted camelina and carinata meals in vitro 1
BEEF 2015-05 Effect of processing conditions on nutrient disappearance of cold-pressed and hexane-extracted camelina and carinata meals in vitro 1 A. Sackey 2, E. E. Grings 2, D. W. Brake 2 and K. Muthukumarappan
More informationSULPHIDES IN WINE. Treatment and Prevention - a practical approach
SULPHIDES IN WINE Treatment and Prevention - a practical approach SULPHIDES and the screwcap challenge A VERY common wine fault, especially in screwcap wines: of the bottles with faults, cork taint stayed
More informationCOMPENDIUM OF INTERNATIONAL METHODS OF ANALYSIS - OIV Volatile acidity. Volatile Acidity
Method OIV-MA-AS313-02 Type I method Volatile Acidity 1. Definition The volatile acidity is derived from the acids of the acetic series present in wine in the free state and combined as salts. 2. Principle
More informationTypes of Sanitizers. Heat, w/ water or steam to saturate effect
Types of Sanitizers Heat, w/ water or steam to saturate effect Very effective anti-microbial, except some encysted forms Exposure time critical Non-corrosive, but energy intensive Chemical Effectiveness
More informationEffect of Oxidation on Wine Composition. Andrew L. Waterhouse University of British Columbia, Kelowna Mar 25, 2011
Effect of xidation on Wine Composition Andrew L. Waterhouse University of British Columbia, Kelowna Mar 25, 2011 xygen Reduction Cascade +e - +e - 2.- 2 Superoxide 2 2- Peroxide +e - +e - Hydroxyl radical
More informationAndrew L. Waterhouse 1 * and V. Felipe Laurie 1,2
306 Waterhouse and Laurie From the ASEV 2005 Phenolics Symposium Oxidation of Wine Phenolics: A Critical Evaluation and Hypotheses Andrew L. Waterhouse 1 * and V. Felipe Laurie 1,2 Abstract: Oxidation
More informationPetite Mutations and their Impact of Beer Flavours. Maria Josey and Alex Speers ICBD, Heriot Watt University IBD Asia Pacific Meeting March 2016
Petite Mutations and their Impact of Beer Flavours Maria Josey and Alex Speers ICBD, Heriot Watt University IBD Asia Pacific Meeting March 2016 Table of Contents What Are They? No or reduced mitochondrial
More informationVITIS vinifera GRAPE COMPOSITION
VITIS vinifera GRAPE COMPOSITION Milena Lambri Enology Area - DiSTAS Department for Sustainable Food Process Università Cattolica del Sacro Cuore - Piacenza GRAPE (and WINE) COMPOSITION Chemical composition
More informationINSTRUCTIONS FOR CO-INOCULATION
INSTRUCTIONS FOR CO-INOCULATION Preliminary Considerations Objective of this protocol is to promote malolactic fermentation in conjunction with alcoholic fermentation. 1. Work within a temperature range
More informationEmerging Applications
Emerging Applications Headspace Analysis and Stripping of Volatile Compounds from Apple and Orange Juices Using SIFT-MS Introduction Differences in fruit varieties, fruit ripeness and processing techniques
More informationTANNINS & ANTHOCYANINS IN GRAPES & WINE AUGUST 3, 2013 ROCHESTER, NY
Daniel Pambianchi TANNINS & ANTHOCYANINS IN GRAPES & WINE AUGUST 3, 2013 ROCHESTER, NY 1 REVIEW FUNDAMENTAL TANNIN & ANTHOCYANIN CHEMISTRY TO UNDERSTAND HOW THESE AND THE MANY OTHER WINE COMPONENTS INTERACT
More informationAn Economic And Simple Purification Procedure For The Large-Scale Production Of Ovotransferrin From Egg White
An Economic And Simple Purification Procedure For The Large-Scale Production Of Ovotransferrin From Egg White D. U. Ahn, E. J. Lee and A. Pometto Department of Animal Science, Iowa State University, Ames,
More informationEnzymatic Hydrolysis of Ovomucin and the Functional and Structural Characteristics of Peptides in the Hydrolysates
Animal Industry Report AS 663 ASL R3128 2017 Enzymatic Hydrolysis of Ovomucin and the Functional and Structural Characteristics of Peptides in the Hydrolysates Sandun Abeyrathne Iowa State University Hyun
More information