How Chocolate Gets Its Taste
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1 How Chocolate Gets Its Taste Clay Gordon prepared for Roots of Cacao Institute of Culinary Education presented on Feb 4, Clay Gordon/TheChocolateLife except where noted. All Rights Reserved.
2 Chocolate is chemically complex Over 750 distinct aroma/flavor compounds have been identified. No single compound yet detected is responsible for typical cocoa aroma and flavor. About 25 chemicals are needed for typical cocoa aroma. About 15 are needed for typical cocoa taste.
3 With all that complexity How does chocolate get its taste?
4 Taste Equation The final taste of a chocolate F C can be expressed as: Genetics+Terroir [F e~ff+php] mod Manufacturing [F i~ F b~fr 1 ~Fg+r+c] mod Senses [F s ] Note: I use F for Taste so there is no confusing it with the T in Terroir.
5 Genetics & Terroir F gt
6 Genetics < 2008 Criollos Forasteros Trinitarios Nacional (Ecuador, Arriba)
7 Genetics > 2008 Forastero group Clusters: Amelonado, Contamana, Curara, Guiana, Iquitos, Marañon, Nacional, Nanay, Purús Criollo group Clusters: Amelonado, Contamana, Curara, Guiana, Iquitos, Marañon, Nacional, Nanay, Purús Forastero cultivars e.g., Trinitarios, acriollados, other hybrids Origin in South America (Peru?) 450,000,000 base pairs in genome Criollo cultivars e.g., porcelana Origin most likely in Central America (Mexico?) 420,000,000 base pairs in genome
8 Visualizing groups/clusters
9 Visualizing groups/clusters
10 Terroir = Environment+Farming+Post Harvest Environment Soil Elevation/Temps Climate Weather Water Farming, Post Harvest Planting Maintenance Harvesting Fermentation Drying
11 FERMENTATION
12 Why ferment cacao seeds? Kill the seed to prevent germination. Reduce, chemically and thermally, complex chemicals to simpler ones (aka flavor precursors) that can be further changed during drying and manufacturing, especially roasting.
13 Fermentation variables to consider Genetics Location Microbiology Moisture (pulp) ph (acidity) Temperature (pile & ambient) Quantity Containment vessel Times Mixing Brix (sugar)
14 Visualizing one aspect of fermentation
15 VISUALIZATION PRODUCT SHEET 15
16 CONCLUSIONS No correlation between Global Appreciation and Cut-Test results No correlation between %well-fermented beans and FI FI>1 for all fermentations à Completed processes Fermentation Index:%well-fermented beans No clustering for floral (disperse samples) Uniqueness is related to post-harvest protocol and not just genetics Tray-fermented cocoa tends to have more spicy or herbal flavors 16
17 STATISTICAL CORRELATION (Volatiles vs Sensory scores) 17
18 In the final analysis Control two of three variables rule: If same genetics and same controlled post harvest, then other aspects of terroir dominate. Otherwise, post-harvest dominates genetics non-post harvest aspects of terroir when it comes to determining the flavor precursors present in dried cocoa.
19 Manufacturing F m
20 Some manufacturing variables Recipe Ingredients and their processing steps Roasting Grinding and Refining, Conching Type of equipment, times
21 Senses F s
22 Taste Taste is highly bio-individual and is the result of a complex series of chemical reactions and interactions that take place in the nose, mouth, memory, and emotions. Individual sensory apparatus Cultural biases Physics of heat transfer, chewing, and melting Chemistry of water and oil soluble volatiles
23 Some aroma/flavor chemicals alpha-amyl cinnamyl acetate Aromas : floral, jasmine, chocolate, leather, fruity, balsam, spicy, cinnamyl Flavors : earthy, fruity, spicy, powdery and balsamic 2,3,5,6 tetramethyl pyrazine Aromas : musty, nutty, chocolate, coffee, cocoa, soybean, lard, burnt Flavors : nutty, musty, cocoa, drying, peanut-like and raw coffee notes cocoa hexenal Aromas : aldehydic, bitter, cocoa, nut, skin, green, sweet, chocolate, fruity, butyric Flavors : bitter cocoa, honey, aldehydic, coffee and nutty with a green nuance
24 Reconstituting chocolate flavor Potato chips Cooked meat Peaches Raw beef fat Cooked cabbage Earth Cucumber Honey And... more Schieberle, et al, 2011 Human sweat
25 Questions?
26 References Motomayor et al,
N.A. Ali 1, D.A. Sukha 2, G. Meerdink 1 and P. Umaharan 2. International Symposium on Cocoa Research ISCR 2017 Lima, Peru th November 2017
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