The Chemical Signatures of Taste: Characterizing Flavor Compounds in 50 Foods/Flavors
Characterizing flavor compounds are the chemical fingerprints of our food—the essential molecules that tell our senses exactly what we are eating. They are the reason a single whiff can distinguish a ripe strawberry from a crisp apple, or a sip of coffee from a bite of dark chocolate. These key compounds form the distinct identity of a flavor, acting as the primary signal that allows the brain to instantly recognize and differentiate one food from another.
The following is a list of 50 foods and flavors, each defined by its primary characterizing flavor compound(s). This data, cited from the book The Technology of Food Flavoring, includes the associated flavor notes as well as the taste and aroma perception thresholds for each compound.
| Food/Flavor | Flavor Compound | Taste/Aroma Perception Threshold |
|---|---|---|
| Brandy | Ethyl heptanoate | 2 - 5 ppb (Fruity, wine-like) |
| Strong-aroma Baijiu | Ethyl hexanoate | 0.5 - 5 ppb (Strong fruity, pineapple-like) |
| Light-aroma Baijiu | Ethyl acetate, Ethyl lactate | Ethyl acetate: 5 - 50 ppm (Solvent-like, fruity at low levels); Ethyl lactate: 100 - 250 ppm (Buttery, creamy) |
| Thyme | Thymol | 10 - 30 ppm (Herbal, medicinal, thyme-like) |
| Popcorn | 2-Acetylpyridine, 2-Acetylpyrazine | 2-Acetylpyridine: 0.1 - 1 ppm (Popcorn, corn tortilla); 2-Acetylpyrazine: 0.1 - 1 ppm (Roasted, nutty, popcorn) |
| Pineapple | Methyl 3-(methylthio)propionate, Allyl hexanoate | Methyl 3-(methylthio)propionate: 0.01 - 0.1 ppm (Sulfurous, fruity, pineapple); Allyl hexanoate: 0.5 - 5 ppm (Sweet, fruity, pineapple) |
| Mint / Peppermint | Menthol | 0.1 - 1 ppm (Cooling, minty) |
| Strawberry | Estragole, Ethyl β-methyl-β-phenylglycidate | Estragole: 0.01 - 0.1 ppm (Sweet, anise, herbal); Ethyl β-methyl-β-phenylglycidate (Strawberry Furanone): 0.001 - 0.01 ppb (Intensely sweet, strawberry jam) |
| Orange | α-Sinensal | 0.01 - 0.1 ppm (Sweet, citrus, orange peel) |
| Vinegar | Ethyl acetate, Acetic acid | Ethyl acetate: 5 - 50 ppm (Solvent, fruity, nail polish); Acetic acid: 50 - 200 ppm (Sour, pungent, vinegar) |
| Rice | 2-Acetyl-1-pyrroline | 0.01 - 0.1 ppb (Popcorn, roasted, cooked rice, pandan) |
| Garlic | Diallyl disulfide | 0.1 - 1 ppb (Pungent, garlic, sulfurous) |
| Clove | Eugenol | 0.5 - 5 ppb (Spicy, clove, sweet, woody) |
| (General Green/Grassy notes) | cis-3-Hexenal, cis-4-Heptenal, 2-Isobutylthiazole | cis-3-Hexenal: 0.1 - 1 ppb (Freshly cut grass); cis-4-Heptenal: 0.1 - 1 ppb (Creamy, oily, green); 2-Isobutylthiazole: 0.1 - 1 ppb (Green, tomato vine) |
| (Raspberry/ Berry notes) | Raspberry ketone, (Estragole?), β-Ionone, γ-Ionone | Raspberry ketone: 0.1 - 1 ppm (Sweet, raspberry); β-Ionone: 0.001 - 0.01 ppb (Violet, woody, berry); γ-Ionone: 0.01 - 0.1 ppb (Woody, violet, weaker than β) |
| Caraway | d-Carvone | 1 - 10 ppb (Sweet, spearmint-like at low levels; caraway at high levels) |
| Peanut | 2-Methyl-5-methoxypyrazine, 2,5-Dimethylpyrazine | 2-Methyl-5-methoxypyrazine: 0.1 - 1 ppb (Earthy, peanut, bell pepper); 2,5-Dimethylpyrazine: 1 - 10 ppm (Nutty, cocoa, roasted) |
| Cucumber | trans-2-cis-6-Nonadienal | 0.01 - 0.1 ppb (Fresh cucumber, melon) |
| Fennel / Anise | Anethole, Methyl chavicol (Estragole) | Anethole: 10 - 50 ppm (Sweet, anise, licorice); Methyl chavicol: 10 - 50 ppb (Sweet, anise, herbal) |
| Basic Meaty Flavor | Methyl-3-furanyl disulfide, Trimethylthiazole, 2-Methyl-3-furanthiol, 2,5-Dimethyl-3-furanthiol, 2-Methyl-3-(methylthio)furan, Methyl(2-methyl-3-furanyl) disulfide | 2-Methyl-3-furanthiol: 0.0001 - 0.001 ppb (Boiled meat, savory); Bis(2-methyl-3-furyl) disulfide: <0.0001 ppb (Intense meaty, savory); Others in low ppb range |
| Characteristic Mutton Flavor | 4-Methyloctanoic acid, 4-Ethyloctanoic acid, 4-Methylnonanoic acid | 4-Methyloctanoic acid: 0.1 - 1 ppm (Goaty, mutton, sweaty); 4-Ethyloctanoic acid: 0.01 - 0.1 ppm (Powerful animal, goat); 4-Methylnonanoic acid: similar to above |
| Soy Sauce | Soy sauce ketone (4-Hydroxy-2(or 5)-ethyl-5(or 2)-methyl-3(2H)-furanone) | 0.1 - 1 ppm (Soy sauce, sweet, caramel-like) |
| Caramel | 2,5-Dimethyl-4-hydroxy-3(2H)-furanone (Furaneol), Maltol, Ethyl maltol | Furaneol: 0.01 - 0.1 ppm (Caramelized sugar, strawberry); Maltol: 5 - 30 ppm (Caramel, cotton candy); Ethyl maltol: 0.1 - 1 ppm (Intensely sweet, caramelized fruit) |
| Coffee | Furfuryl mercaptan (Furfuryl thiol), Furfuryl thiopropionate | Furfuryl mercaptan: 0.001 - 0.01 ppb (Roasted coffee, sulfurous); Furfuryl thiopropionate: likely low ppb range |
| Roasted Aroma | 2,5-Dimethylpyrazine | 1 - 10 ppm (Nutty, roasted, cocoa) |
| Spearmint | l-Carvone | 1 - 10 ppb (Cooling, spearmint) |
| Mushroom | 1-Octen-3-ol, 1-Octen-3-one | 1-Octen-3-ol: 0.1 - 1 ppb (Mushroom, earthy, fungal); 1-Octen-3-one: 0.01 - 0.1 ppb (Metallic, mushroom, earthy) |
| Cheese | 2-Heptanone | 0.1 - 1 ppm (Fruity, spicy, blue cheese-like) |
| Cream | Diacetyl (2,3-Butanedione) | 0.1 - 1 ppb (Buttery, creamy) |
| Lemon | Citral (mixture of Geranial and Neral) | 10 - 50 ppb (Lemon, citrus, fresh) |
| Apple | Isoamyl acetate, Ethyl 2-methylbutyrate, Hexanal, Tagetes oil | Isoamyl acetate: 1 - 10 ppb (Banana, fruity); Ethyl 2-methylbutyrate: 0.1 - 1 ppb (Apple, fruity, sweet); Hexanal: 5 - 50 ppb (Green, grassy, apple skin) |
| Grape | Methyl anthranilate | 1 - 5 ppb (Foxy, sweet, grape, specifically Concord grape) |
| Chocolate | 5-Methyl-2-phenyl-2-hexenal, Tetramethylpyrazine, Isoamyl butyrate, Vanillin, Ethyl vanillin, 2-Methoxy-5-methylpyrazine | 5-Methyl-2-phenyl-2-hexenal: 0.1 - 1 ppb (Cocoa, chocolate); Tetramethylpyrazine: 1 - 10 ppm (Cocoa, coffee, nutty); Isoamyl butyrate: 5 - 50 ppb (Sweet, fruity); Vanillin: 5 - 50 ppb (Vanilla); Ethyl vanillin: 0.1 - 1 ppb (Intense vanilla) |
| Celery | 3-Butyl-4,5,6,7-tetrahydrophthalide, 3-Propylidenephthalide | Low ppb range (Celery, herbal, spicy, hay-like) |
| Green / Grassy | cis-3-Hexenal | 0.1 - 1 ppb (Freshly cut grass) |
| Cinnamon | Cinnamaldehyde | 10 - 50 ppb (Cinnamon, spicy, warm) |
| Pear | Ethyl trans-2, cis-4-decadienoate | 0.1 - 1 ppb (Sweet, ripe pear, characteristic) |
| Peach | γ-Undecalactone (Peach aldehyde), 6-Pentyl-α-pyrone | γ-Undecalactone: 1 - 10 ppb (Sweet, fruity, peach, creamy); 6-Pentyl-α-pyrone: 0.1 - 1 ppm (Coconut, peach, lactonic) |
| Melon | 2-Phenylpropanal (Hydratropaldehyde), 2-Methyl-3-(4-isopropylphenyl)propanal (Cyclamen aldehyde) | Likely in ppb range for both (Floral, fruity, melon, cucumber nuances) |
| Potato | 3-(Methylthio)propanal (Methional), Methyl propyl sulfide, 2-Isopropyl-3-methoxypyrazine | Methional: 0.1 - 1 ppb (Cooked potato, savory, sulfurous); 2-Isopropyl-3-methoxypyrazine: 0.1 - 1 ppb (Earthy, green pea, bell pepper, potato skin) |
| Vanilla | Vanillin, Ethyl vanillin | Vanillin: 5 - 50 ppb (Vanilla); Ethyl vanillin: 0.1 - 1 ppb (Intense vanilla, sweeter than vanillin) |
| Banana | Isoamyl acetate | 1 - 10 ppb (Banana, fruity) |
| Bergamot | Linalyl acetate | 10 - 100 ppb (Sweet, floral, citrusy, bergamot-like) |
| Almond | Benzaldehyde | 50 - 500 ppb (Marzipan, almond, cherry-like) |
| Apricot | γ-Undecalactone | 1 - 10 ppb (Sweet, fruity, peach, apricot, creamy) |
| Smoky / Smoke | Guaiacol | 0.5 - 5 ppb (Smoky, phenolic, sweet, burnt) |
| (General floral note) | Linalool | 1 - 10 ppb (Floral, citrusy, sweet, woody) |
| Onion | Dipropyl disulfide | 0.1 - 1 ppb (Pungent, sulfurous, fresh onion) |
| Coconut | γ-Nonalactone (Coconut aldehyde) | 1 - 10 ppb (Sweet, creamy, coconut, lactonic) |
| Cherry | Benzaldehyde, Amyl butyrate, Ethyl lactate, Benzyl alcohol, Anisaldehyde | Benzaldehyde: 50 - 500 ppb (Marzipan, almond, cherry); Amyl butyrate: 5 - 50 ppb (Sweet, fruity, apricot); Ethyl lactate: 100 - 250 ppm (Buttery, creamy); Benzyl alcohol: 10 - 100 ppm (Faint aromatic, sweet); Anisaldehyde: 5 - 50 ppb (Sweet, floral, hawthorn, creamy) |
| Grapefruit | Nootkatone, 1-p-Menthene-8-thiol | Nootkatone: 0.5 - 5 ppm (Grapefruit, citrus, bitter); 1-p-Menthene-8-thiol: 0.00001 - 0.0001 ppb (Extremely potent, grapefruit, tropical, sulfurous) |
| Hazelnut | 2-Methyl-5-(methylthio)pyrazine | 0.1 - 1 ppb (Roasted, nutty, hazelnut, earthy) |
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