Avocado. recipe or working method? WLODEK. Wlodzimierz S. BOREJSZA-WYSOCKI Ph.D. IR-4 Southern Regional Laboratory Research Director
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1 Avocado recipe or working method? WLODEK Wlodzimierz S. BOREJSZA-WYSOCKI Ph.D. IR-4 Southern Regional Laboratory Research Director Food & Environmental Toxicology Laboratory Institute of Food and Agricultural Sciences University of Florida, Gainesville, FL Orlando, FL, 2/28-3/01/2017
2 Perfect Guacamole?
3 Perfect IR-4 sample
4 Projects 6-Benzyladenine (2012), PR#10922 Bifenthrin (2013), PR#10578 AVOCADO λ-cyhalothrin (2010), PR#10540 Novaluron (2009), PR#09246
5 Reference Method CHEMICAL STRUCTURE COMMODITY EXTRACTION SOLVENT (Relative polarity) 6-BENZYLADENINE Apple and Pear 0.1 N HCl in (Plant Growth Regulator) Methanol (insoluble in water) (0.762) BIFENTHRIN Potato Acetone (Insecticide) (0.355) (poorly soluble in water 0.1 mg/l)
6 Reference Method CHEMICAL STRUCTURE COMMODITY EXTRACTION SOLVENT (Relative polarity) λ-cyhalothrin Fruits, vegetables Acetone:Hexane (insecticide) and grains 50:50 (0.182) (insoluble in water mg/l) NOVALURON Pome Fruits Methanol:Water (insecticide) 70:30 (insoluble in water (0.881) mg/l)
7 Commodities Commodity Compounds (%) Water Fat Carbohydrates Protein Avocado Apple & Pear Potato Cauliflower Broccoli Cabbage Bean Pea
8 Modifications (6-Benzyladenine on Avocado) Reference Method Working Method *Acidic Partition and Basic Partition 3 x partitioned 4 x partitioned vigorously shaken gently shaken (reduced emulsion formation) Yes Yes GC/MS *Derivatization *Post-Derivatization Cleanup *Instrument No No LC/MS/MS
9 Reference Method Modifications (Bifenthrin on Avocado) Working Method * Extraction 2.5 g + 2 x 15 ml acetone 2.5 g + 2 x 15 ml acetone * Evaporate under a stream of nitrogen (~35oC) ~ 2 ml residual water ~2 ml 2mL residual water + oil * Partition with hexane Yes * Cleanup 1 g Silica SPE cartridge 2 g Silica SPE cartridge *Elute Bifenthrin with 12 ml of 10 % ethyl acetate/hexane 4 ml of 4% ethyl acetate/hexane (discard), 7 ml of 4% ethyl acetate/hexane * Evaporate to ~ 0.25 ml remains under nitrogen, dissolve in hexane and analyze by GC/MSD GC/ECD Yes
10 Reference Method Modifications (Novaluron on Avocado) Working Method * Extraction 2 x 100 ml Methanol : water (70:30) 2 x 100 ml Methanol : water (70:30) 1 x 50 ml Methanol * Evaporate on rotary evaporator at ~40oC *Liquid/Liquid cleanup 2 x with hexane 2 x with ethyl acetate * Evaporate on rotary evaporator at ~40oC to a low volume (hexane) * SPE cleanup on NH2 cartridge Loaded and discarded Elute with dietheyl ether : ethyl acetate (50:50) to dryness and add ethyl acetate loaded and collected elute with ethyl acetate and acetone : hexane (50:50) *Evaporate under a stream of nitrogen and reconstitute in the ethyl acetate *Analyze the Novaluron residue by GC/ECD
11 Reference Method Modifications (λ-cyhalothrin on Avocado) Working Method * Extraction with hexane : acetone (50:50) * Evaporate on rotary evaporator complete dryness near dryness (oil/water) add 4 ml acetonitrile, sonicate add 6 ml water, sonicate (dilute with 60/40, water/acetonitrile) * Solvent exchange -add hexane, sonicate * Centrifuge Separate hexane (add sodium sulfate) * Instrument * Liquid-Liquid Extraction Cleanup LC/MS/MS add acetonitrile saturated with hexane separate acetonitrile, evaporate to dryness and residue dissolve in hexane * SPE Cleanup
12 Modifications (λ-cyhalothrin on Avocado) Reference Method Working Method * SPE Cleanup 2 g Cyano Cartridge Elute with 1.5% acetone in hexane Evaporate to dryness Dissolve residue in 10 ml acetonitrile (sonicate), add 15 ml water and mix well (60/40 water/acetonitrile) * Instrument LC/MS/MS
13 How much does the working method reflect the reference method? A B
14
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No adulterants, diluents, or contaminants were detected via this method. Conforms to 10/12 Iso Norms
1 Sample: Client: Sample: Brambleberry Batch # 10188501 CAS Number 8000-28-0 Type: Country Lavender (Lavandula angustifolia) Essential Oil France Conclusion: No adulterants, diluents, or contaminants were
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Figure 11.1 Derivatives of Salicylic Acid O C OH OCH3. Na + OH sodium salicylate. OH CH3 Acetylsaliclic acid Aspirin.
Experiment 11 heck-in; A. heck-in Be sure that all of your glassware is present in your locker at check-in time. nce you have checked-in you will be held responsible for missing or damaged glassware items.
2. Other constituents in the sample solution should not interfere with the precipitation of the component of interest.
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No adulterants, diluents, or contaminants were detected via this method. Conforms to ranges found in the literature. Extra caution should be taken
1 Sample: Client: Sample: Brambleberry Batch # 10355605 CAS Number 8000-28-0 Type: Lavender Absolute (Lavandula angustifolia) Essential Oil Conclusion: No adulterants, diluents, or contaminants were detected
The grade 5 English science unit, Solutions, meets the academic content standards set in the Korean curriculum, which state students should:
This unit deals with how solids dissolve in liquids and what affects their dissolution. By studying the dissolution process and related factors, students develop an interest in and curiosity about solutions.
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www.quality-control-plan.com/copyright.htm PROCEDURE FOR PREPARING STANDARD REAGENTS, MISCELLANEOUS SOLUTIONS, AND INDICATORS (mo/yr) Revisions Rev: Letter E.O. Number - Description Date Used On Contract#:
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