> ## Content Index > Fetch the complete content index at: https://www.flavorist.com/llms.txt > Use this file to discover other available public pages before exploring further. # 128 Important Synthetic Flavor Compounds Every Flavorist Needs to Know and Work with - URL: https://www.flavorist.com/128-important-synthetic-flavor-compounds-every-flavorist-needs-to-know-and-work-with/ - Published: 2026-03-29T00:44:55.000Z - Updated: 2026-03-29T12:51:06.000Z - Author: Editor This is a quick-reference list of the flavor compounds John Wright recommends in *Flavor Creation* as essential for every flavorist to know and work with. Details for each compound are provided in multiple parts—Parts 1 through 13. Here are the complete series: --- ## Important Synthetic Flavor Compounds - Complete Series | Part | Title | URL | | ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Part 1** | Alcohols & Aldehydes (Isoamyl alcohol, cis-3-Hexenol, 1-Octen-3-ol, cis-6-Nonen-1-ol, Acetaldehyde, Isovaleraldehyde, Hexanal, Octanal, Decanal, trans-2-Hexenal) | | | **Part 2** | Aldehydes & Ketones (trans-2-Nonenal, trans-2,cis-6-Nonadienal, trans-2,trans-4-Decadienal, 2-Heptanone, 2-Octen-4-one, Diacetyl, Acetoin, Acetic acid, Butyric acid, 2-Methyl butyric acid) | | | **Part 3** | Acids & Esters (Isovaleric acid, Caproic acid, Caprylic acid, Capric acid, Lauric acid, 2-Methyl-2-pentenoic acid, cis-3-Hexenoic acid, Ethyl acetate, Ethyl butyrate, Ethyl 2-methyl butyrate) | | | **Part 4** | Esters (Ethyl 3-methyl butyrate, Ethyl hexanoate, Isopropyl acetate, Isobutyl acetate, Isoamyl acetate, Isoamyl butyrate, Ethyl acrylate, Ethyl cis-4-octenoate, Ethyl trans-2,cis-4-decadienoate, Allyl hexanoate) | | | **Part 5** | (cis-3-hexenyl acetate, cis-3-hexenyl butyrate, methane thiol or methyl mercaptan, dimethyl sulfide, 3-(methylthio) propanal,methyl thiobutyrate, methyl 3-methylthiopropionate, 3-methylcyclopentane-1,2-dione, methyl jasmonate, linalool) | | | **Part 6** | Terpene Alcohols & Ketones (Citronellol, Geraniol, Nerol, alpha-Terpineol, Menthol, Citronellal, Citral, alpha-Ionone, beta-Ionone, l-Carvone) | | | **Part 7** | Damascones & Acetates (alpha-Damascone, beta-Damascone, Damascenone, Nootkatone, Neryl acetate, Geranyl acetate, Citronellyl acetate, Linalyl acetate, Isobornyl acetate, 4-Mentha-8-thiol-3-one) | | | **Part 8** | Citrus & Terpenes (Grapefruit mercaptan, Myrcene, Valencene, 1,8-Cineole, Neryl oxide, Linalool oxide, 2-Phenyl ethanol, Benzaldehyde, Raspberry ketone, Phenylacetic acid) | | | **Part 9** | Floral & Spice (Methyl phenyl acetate, Methyl p-tert-butyl phenyl acetate, DMBC butyrate, Methyl cinnamate, 2,6-Dimethyl phenol, Guaiacol, Syringol, Eugenol, Methyl anthranilate, Vanillin) | | | **Part 10** | Vanilla & Lactones (Ethyl vanillin, Anethole, Anisaldehyde, Heliotropine, γ-Hexalactone, γ-Nonalactone, γ-Decalactone, γ-Undecalactone, γ-Octalactone, γ-Dodecalactone) | | | **Part 11** | Lactones & Furans (γ-Decalactone, γ-Dodecalactone, Exaltolide, Ambrettolide, 5-Methylfurfural, 2-Acetylfurfural, Theaspirane, 2-Methyl tetrahydrofuran-3-one, Furfuryl mercaptan, 2-Methyl-3-tetrahydrofuran thiol) | | | **Part 12** | Pyrazines & Sweet Notes (Difurfuryl sulfide, Maltol, Ethyl maltol, Indole, 2,3-Dimethyl pyrazine, Trimethyl pyrazine, Tetramethyl pyrazine, 2-Acetyl pyrazine, 2-Methoxy-3-methyl pyrazine, 2-Methoxy-3-ethyl pyrazine) | | | **Part 13** | Heterocyclics (2-Methoxy-3-isobutyl pyrazine, 2-Isopropyl-4-methyl thiazole, 2-Isobutyl thiazole, Pyridine, 2-Acetyl pyridine, 2,4,5-Trimethyl oxazole, Trithioacetone) | | --- ### Isoamyl alcohol - **Aroma Descriptors:** Fermented, banana, fruity, alcoholic, fusel oil - **Odor Threshold:** 250–300 ppb (in water) - **Applications:** Whiskey, brandy, rum, fruit essences (banana, apple) ### cis-3-Hexenol - **Aroma Descriptors:** Fresh cut grass, green leaf, vegetative, melon - **Odor Threshold:** 0.1–0.7 ppb - **Applications:** Green notes in tea, strawberry, tomato, and gardenia ### 1-Octen-3-ol - **Aroma Descriptors:** Mushroom, earthy, fungal, oily, vegetative - **Odor Threshold:** 0.01–0.02 ppb (very low) - **Applications:** Mushroom flavor, porcini, truffle, soy sauce, savory snacks ### cis-6-Nonen-1-ol - **Aroma Descriptors:** Melon, cucumber, violet, fatty, green - **Odor Threshold:** 0.05–0.1 ppb - **Applications:** Melon (cantaloupe), cucumber, violet fragrances --- ## Aldehydes ### Acetaldehyde - **Aroma Descriptors:** Pungent, ethereal, green, fruity (fresh apple) - **Odor Threshold:** 4–25 ppb - **Applications:** Yogurt, ripe fruit, coffee, alcoholic beverages ### Isovaleraldehyde - **Aroma Descriptors:** Pungent, malty, chocolate, fruity, nutty - **Odor Threshold:** 1–2 ppb - **Applications:** Cocoa, chocolate, dairy, fermented notes ### Hexanal - **Aroma Descriptors:** Green, grassy, unripe apple, fatty - **Odor Threshold:** 4.5–5 ppb - **Applications:** Green apple, fresh cut grass, tomato, citrus ### Octanal - **Aroma Descriptors:** Citrus, orange, soapy, fatty - **Odor Threshold:** 0.7–1 ppb - **Applications:** Orange oil reconstructions, citrus flavors ### Decanal - **Aroma Descriptors:** Orange peel, citrus, waxy, floral - **Odor Threshold:** 0.1–3 ppb - **Applications:** Sweet orange flavor, citrus blends, floral perfumery ### trans-2-Hexenal - **Aroma Descriptors:** Green apple, almond, leafy, fruity - **Odor Threshold:** 17–20 ppb - **Applications:** Apple, tomato, strawberry, cucumber ### trans-2-Nonenal - **Aroma Descriptors:** Cucumber, melon, tallowy, cardboard, stale - **Odor Threshold:** 0.08–0.5 ppb (extremely low) - **Applications:** Cucumber flavor; also associated with off-flavor in aged beer and cereal ### trans-2,cis-6-Nonadienal - **Aroma Descriptors:** Cucumber, watermelon, violet, powerful green - **Odor Threshold:** 0.01–0.05 ppb - **Applications:** Cucumber, melon, tropical fruit flavors ### trans-2,trans-4-Decadienal - **Aroma Descriptors:** Fatty, fried chicken, orange peel, tallowy - **Odor Threshold:** 0.02–0.5 ppb - **Applications:** Fried chicken, potato chips, orange juice, deep-fried notes --- ## Ketones & Diketones ### 2-Heptanone - **Aroma Descriptors:** Blue cheese, spicy, banana, fruity, cinnamon - **Odor Threshold:** 140 ppb - **Applications:** Blue cheese, dairy, fruity nuances ### 2-Octen-4-one - **Aroma Descriptors:** Fruity, earthy, mushroom, nutty - **Odor Threshold:** 0.01–0.1 ppb - **Applications:** Mushroom, strawberry, tropical fruits ### Diacetyl - **Aroma Descriptors:** Buttery, creamy, caramel, sweet - **Odor Threshold:** 0.2–2.0 ppb - **Applications:** Butter, margarine, popcorn, butterscotch, dairy ### Acetyl methyl carbinol (Acetoin) - **Aroma Descriptors:** Buttery, creamy, yogurt, slightly sweet - **Odor Threshold:** 800–1000 ppb (much higher than diacetyl) - **Applications:** Dairy, butter, wine; often used with diacetyl for balance --- ## Acids ### Acetic acid - **Aroma Descriptors:** Vinegar, pungent, sour - **Odor Threshold:** 0.5–1 ppm - **Applications:** Vinegar, pickles, fermentation notes ### Butyric acid - **Aroma Descriptors:** Rancid butter, cheesy, vomit (at high concentration) - **Odor Threshold:** 0.5–1 ppm - **Applications:** Cheese, butter, dairy; also in strawberry and pineapple at low levels ### 2-Methyl butyric acid - **Aroma Descriptors:** Sweaty, cheesy, fruity (strawberry, apple) - **Odor Threshold:** 0.1–0.5 ppm - **Applications:** Strawberry, apple, cheese, dairy ### 3-Methyl butyric acid (Isovaleric acid) - **Aroma Descriptors:** Sweaty, cheesy, rancid, foot odor - **Odor Threshold:** 0.1–0.5 ppm - **Applications:** Cheese, chocolate, fermented dairy ### Caproic acid (Hexanoic acid, C6) - **Aroma Descriptors:** Goat-like, sweaty, waxy, cheesy - **Odor Threshold:** 2–3 ppm - **Applications:** Cheese (especially goat), dairy, tropical fruits ### Caprylic acid (Octanoic acid, C8) - **Aroma Descriptors:** Rancid, soapy, slightly fruity - **Odor Threshold:** 0.5–1 ppm - **Applications:** Cheese, coconut, fermented notes ### Capric acid (Decanoic acid, C10) - **Aroma Descriptors:** Waxy, soapy, orange-like, fatty - **Odor Threshold:** 1–2 ppm - **Applications:** Dairy, citrus, coconut ### Lauric acid (Dodecanoic acid, C12) - **Aroma Descriptors:** Waxy, soapy, metallic - **Odor Threshold:** 1–10 ppm - **Applications:** Coconut, soap, dairy ### 2-Methyl-2-pentenoic acid - **Aroma Descriptors:** Fruity, strawberry, sharp, acidic - **Odor Threshold:** Not well established - **Applications:** Strawberry, tropical fruit, and berry flavors ### cis-3-Hexenoic acid - **Aroma Descriptors:** Grassy, green, cheesy, sweaty - **Odor Threshold:** Not well established - **Applications:** Green notes, tropical fruits, and dairy --- ## Esters ### Ethyl acetate - **Aroma Descriptors:** Fruity, pineapple, nail polish remover - **Odor Threshold:** 5,000–12,000 ppb - **Applications:** Solvent note in fruit blends, pear, wine ### Ethyl butyrate - **Aroma Descriptors:** Juicy fruit, pineapple, strawberry, bubble gum - **Odor Threshold:** 1–2 ppb - **Applications:** Orange juice, pineapple, strawberry, rum ### Ethyl 2-methyl butyrate - **Aroma Descriptors:** Fruity, apple, strawberry, sweet - **Odor Threshold:** 0.1–0.5 ppb - **Applications:** Apple, strawberry, fruit cocktail flavors ### Ethyl 3-methyl butyrate - **Aroma Descriptors:** Fruity, apple, pineapple, sweet - **Odor Threshold:** 1–5 ppb - **Applications:** Apple, pineapple, fruit blends ### Ethyl hexanoate - **Aroma Descriptors:** Fruity, pineapple, banana, green apple - **Odor Threshold:** 1–5 ppb - **Applications:** Pineapple, apple, alcoholic beverages (wine, brandy) ### Isopropyl acetate - **Aroma Descriptors:** Fruity, sweet, pear, solvent-like - **Odor Threshold:** 2,000–10,000 ppb - **Applications:** Pear, apple, and solvent notes in fruit flavors ### Isobutyl acetate - **Aroma Descriptors:** Fruity, sweet, pear, banana, solvent - **Odor Threshold:** 1,500–2,500 ppb - **Applications:** Pear, banana, and fruit punch flavors ### Isoamyl acetate - **Aroma Descriptors:** Banana, pear, candy-like, sweet - **Odor Threshold:** 2–5 ppb - **Applications:** Banana flavor, pear drops, bubble gum ### Isoamyl butyrate - **Aroma Descriptors:** Fruity, sweet, apricot, pear, banana - **Odor Threshold:** 10–20 ppb - **Applications:** Apricot, pear, banana, and tropical fruit blends ### Ethyl acrylate (Ethyl 2-propenoate) - **Aroma Descriptors:** Pungent, fruity, plastic, pineapple - **Odor Threshold:** 0.5–2 ppb - **Applications:** Used cautiously in fruit flavors; also a known off-flavor ### Ethyl cis-4-octenoate - **Aroma Descriptors:** Fruity, juicy, pineapple, waxy - **Odor Threshold:** 0.5–1 ppb - **Applications:** Pineapple, tropical fruit, and citrus ### Ethyl trans-2,cis-4-decadienoate - **Aroma Descriptors:** Pear, apple, tropical, waxy, melon - **Odor Threshold:** 0.01–0.05 ppb (extremely low) - **Applications:** Pear, apple, tropical fruit nuances ### Allyl hexanoate - **Aroma Descriptors:** Pineapple, sweet, fruity - **Odor Threshold:** 10–20 ppb - **Applications:** Pineapple flavor, tropical blends ### cis-3-Hexenyl acetate - **Aroma Descriptors:** Green banana, pear, apple, grassy - **Odor Threshold:** 2–10 ppb - **Applications:** Green apple, pear, tea, fresh vegetable notes ### cis-3-Hexenyl butyrate - **Aroma Descriptors:** Green, fruity, pear, apple, tropical - **Odor Threshold:** 5–15 ppb - **Applications:** Green fruit notes, apple, pear, and tropical flavors --- ## Sulfur Compounds ### Methane thiol (Methyl mercaptan) - **Aroma Descriptors:** Rotten cabbage, garlic, sulfurous - **Odor Threshold:** 0.02–0.4 ppb - **Applications:** Onion, garlic, leek, cheese; also a common off-flavor ### Dimethyl sulfide (DMS) - **Aroma Descriptors:** Canned corn, cabbage, seafood, sweet - **Odor Threshold:** 0.3–3 ppb - **Applications:** Corn, tomato, seafood, beer ### 3-(Methylthio) propanal (Methional) - **Aroma Descriptors:** Cooked potato, soup, savory, earthy - **Odor Threshold:** 0.2–0.5 ppb - **Applications:** Potato, savory snacks, meat flavors ### Methyl thiobutyrate - **Aroma Descriptors:** Fruity, sulfurous, cheese, pineapple - **Odor Threshold:** 1–5 ppb - **Applications:** Pineapple, cheese, tropical fruit ### Methyl 3-methylthiopropionate - **Aroma Descriptors:** Fruity, pineapple, sulfurous, tomato - **Odor Threshold:** 0.5–2 ppb - **Applications:** Pineapple, tomato, tropical fruits --- ## Miscellaneous Cyclic & Aroma Compounds ### 3-Methylcyclopentane-1,2-dione - **Aroma Descriptors:** Caramel, maple, sweet, nutty - **Odor Threshold:** 10–50 ppb - **Applications:** Maple, caramel, butterscotch, coffee ### Methyl jasmonate - **Aroma Descriptors:** Floral, jasmine, sweet, tea-like - **Odor Threshold:** 10–20 ppb - **Applications:** Jasmine, tea, floral compositions --- ## Terpenes & Terpenoids ### Linalool - **Aroma Descriptors:** Floral, lavender, bergamot, sweet - **Odor Threshold:** 0.5–6 ppb - **Applications:** Lavender, citrus, floral blends, tea ### Citronellol - **Aroma Descriptors:** Rose, floral, citrus, sweet - **Odor Threshold:** 40–80 ppb - **Applications:** Rose, geranium reconstructions ### Geraniol - **Aroma Descriptors:** Sweet rose, floral, fruity - **Odor Threshold:** 30–75 ppb - **Applications:** Rose, peach, citrus flavors ### Nerol - **Aroma Descriptors:** Sweet rose, floral, fresh, citrus - **Odor Threshold:** 50–100 ppb - **Applications:** Rose, neroli, citrus oils ### alpha-Terpineol - **Aroma Descriptors:** Lilac, floral, pine, woody - **Odor Threshold:** 280–350 ppb - **Applications:** Lilac, pine, citrus oils ### Menthol - **Aroma Descriptors:** Mint, cooling, peppermint, fresh - **Odor Threshold:** 50–200 ppb - **Applications:** Peppermint, menthol cigarettes, oral care ### Citronellal - **Aroma Descriptors:** Lemon, citrus, green, grassy - **Odor Threshold:** 10–30 ppb - **Applications:** Lemon, citronella, insect repellents, citrus flavors ### Citral - **Aroma Descriptors:** Lemon, intense citrus, fresh - **Odor Threshold:** 30–50 ppb - **Applications:** Lemon, lime, citrus flavors ### alpha-Ionone - **Aroma Descriptors:** Violet, woody, floral, raspberry - **Odor Threshold:** 10–20 ppb - **Applications:** Violet, raspberry, woody floral blends ### beta-Ionone - **Aroma Descriptors:** Violet, woody, floral, berry - **Odor Threshold:** 0.007–0.01 ppb (extremely low) - **Applications:** Violet, raspberry, strawberry, tea ### Laevo-Carvone - **Aroma Descriptors:** Spearmint, sweet - **Odor Threshold:** 20–50 ppb - **Applications:** Spearmint, chewing gum, toothpaste ### alpha-Damascenone - **Aroma Descriptors:** Apple, rose, honey, tobacco, fruity - **Odor Threshold:** 0.01–0.05 ppb - **Applications:** Rose, apple, honey, tobacco, wine ### beta-Damascone - **Aroma Descriptors:** Fruity, floral, plum, blackcurrant, woody - **Odor Threshold:** 0.01–0.05 ppb - **Applications:** Blackcurrant, plum, tobacco, floral blends ### Damascenone - **Aroma Descriptors:** Apple, rose, honey, tobacco, fruity - **Odor Threshold:** 0.002–0.01 ppb (extremely low) - **Applications:** Rose, apple, honey, tobacco, wine ### Nootkatone - **Aroma Descriptors:** Grapefruit, woody, citrus - **Odor Threshold:** 0.5–1 ppb - **Applications:** Grapefruit, citrus flavors --- ## Terpene Esters ### Neryl acetate - **Aroma Descriptors:** Floral, rose, sweet, citrus - **Odor Threshold:** 100–200 ppb - **Applications:** Neroli, bergamot, floral compositions ### Geranyl acetate - **Aroma Descriptors:** Floral, rose, sweet, fruity - **Odor Threshold:** 10–50 ppb - **Applications:** Rose, lavender, citrus, fruity florals ### Citronellyl acetate - **Aroma Descriptors:** Fruity, rose, floral, citrus - **Odor Threshold:** 20–100 ppb - **Applications:** Rose, citrus, fruity floral blends ### Linalyl acetate - **Aroma Descriptors:** Floral, lavender, bergamot, sweet - **Odor Threshold:** 100–500 ppb - **Applications:** Lavender, bergamot, floral perfumes ### Isobornyl acetate - **Aroma Descriptors:** Pine, woody, camphoraceous, herbal - **Odor Threshold:** 10–50 ppb - **Applications:** Pine, fir, woody accords, air fresheners --- ## Thiols (Highly Potent) ### 4-Mentha-8-thiol-3-one - **Aroma Descriptors:** Blackcurrant, cat urine (at high concentration), tropical - **Odor Threshold:** 0.0005–0.001 ppb (extremely low) - **Applications:** Blackcurrant, grapefruit, tropical fruits ### Para-Menth-1-ene-8-thiol - **Aroma Descriptors:** Grapefruit, sulfury, tropical - **Odor Threshold:** 0.0001–0.0005 ppb (extremely low) - **Applications:** Grapefruit, citrus notes --- ## Hydrocarbons ### Myrcene - **Aroma Descriptors:** Herbal, spicy, balsamic, woody, citrus - **Odor Threshold:** 10–30 ppb - **Applications:** Hops, bay, citrus, mango, spice blends ### Valencene - **Aroma Descriptors:** Citrus, orange, woody, fresh - **Odor Threshold:** 10–50 ppb - **Applications:** Orange, citrus flavors, natural orange oil reconstructions --- ## Ethers & Oxides ### 1,8-Cineole (Eucalyptol) - **Aroma Descriptors:** Eucalyptus, camphoraceous, minty, cooling - **Odor Threshold:** 10–50 ppb - **Applications:** Eucalyptus, mint, cough drops, rosemary ### Neryl oxide - **Aroma Descriptors:** Floral, citrus, green, herbal - **Odor Threshold:** Not well established - **Applications:** Floral and citrus blends ### Linalool oxide - **Aroma Descriptors:** Floral, earthy, woody, tea-like - **Odor Threshold:** 100–500 ppb - **Applications:** Tea (especially oolong), floral compositions --- ## Phenyls & Aromatics ### 2-Phenyl ethanol - **Aroma Descriptors:** Rose, honey, floral, sweet - **Odor Threshold:** 750–1000 ppb - **Applications:** Rose, honey, floral compositions ### Benzaldehyde - **Aroma Descriptors:** Almond, cherry, sweet, nutty - **Odor Threshold:** 350–400 ppb - **Applications:** Maraschino cherry, almond, stone fruits ### 4-(4-Hydroxy phenyl)-2-butanone (Raspberry ketone) - **Aroma Descriptors:** Raspberry, sweet, fruity, jammy - **Odor Threshold:** 10–100 ppb - **Applications:** Raspberry, strawberry, fruit blends ### 2-Phenyl acetic acid - **Aroma Descriptors:** Honey, floral, sweet, animalic - **Odor Threshold:** 1–5 ppm - **Applications:** Honey, chocolate, tobacco, floral notes ### Methyl phenyl acetate - **Aroma Descriptors:** Honey, floral, sweet, jasmine - **Odor Threshold:** 50–200 ppb - **Applications:** Honey, jasmine, gardenia, floral blends ### Methyl para-tert-butyl phenyl acetate - **Aroma Descriptors:** Floral, lily, green, earthy - **Odor Threshold:** Not well established - **Applications:** Lily, floral perfumery ### Dimethyl benzyl carbinyl butyrate - **Aroma Descriptors:** Fruity, floral, pear, apricot - **Odor Threshold:** 10–50 ppb - **Applications:** Pear, apricot, floral fruit blends ### Methyl cinnamate - **Aroma Descriptors:** Sweet, fruity, strawberry, balsamic - **Odor Threshold:** 20–100 ppb - **Applications:** Strawberry, cinnamon, fruit flavors --- ## Phenols ### 2,6-Dimethyl phenol - **Aroma Descriptors:** Smoky, phenolic, medicinal, plastic - **Odor Threshold:** 10–100 ppb - **Applications:** Smoke, medicinal flavors; often an off-flavor ### Guaiacol (2-Methoxy phenol) - **Aroma Descriptors:** Smoky, phenolic, medicinal, spicy - **Odor Threshold:** 3–10 ppb - **Applications:** Smoke, barbecue, coffee, vanilla ### 2,6-Dimethoxy phenol - **Aroma Descriptors:** Smoky, woody, spicy, clove-like - **Odor Threshold:** 10–50 ppb - **Applications:** Smoke, clove, medicinal, vanilla nuances ### Eugenol - **Aroma Descriptors:** Clove, spicy, warm, woody - **Odor Threshold:** 5–20 ppb - **Applications:** Clove, cinnamon, carnation, medicinal --- ## Anthranilates & Vanillins ### Methyl anthranilate - **Aroma Descriptors:** Grape, floral, orange blossom, fruity - **Odor Threshold:** 10–50 ppb - **Applications:** Grape, orange blossom, strawberry ### Vanillin - **Aroma Descriptors:** Vanilla, sweet, creamy - **Odor Threshold:** 50–100 ppb (in water) - **Applications:** Vanilla, chocolate, sweet blends ### Ethyl vanillin - **Aroma Descriptors:** Vanilla, sweet, creamy (3x stronger than vanillin) - **Odor Threshold:** 15–30 ppb - **Applications:** Vanilla, chocolate, gourmand flavors --- ## Spice & Floral Aromatics ### Anethole - **Aroma Descriptors:** Licorice, anise, sweet, fennel - **Odor Threshold:** 10–50 ppb - **Applications:** Licorice, anise, fennel, absinthe ### Anisaldehyde - **Aroma Descriptors:** Sweet, floral, anise, hawthorn, powdery - **Odor Threshold:** 10–50 ppb - **Applications:** Hawthorn, anise, floral blends, vanilla nuances ### Heliotropine (Piperonal) - **Aroma Descriptors:** Sweet, floral, cherry, vanilla, powdery - **Odor Threshold:** 10–50 ppb - **Applications:** Cherry, vanilla, almond, heliotrope, powdery florals --- ## Lactones ### gamma-Hexalactone - **Aroma Descriptors:** Sweet, herbal, coumarin-like - **Odor Threshold:** 100–200 ppb - **Applications:** Coconut, peach, creamy notes ### gamma-Nonalactone - **Aroma Descriptors:** Coconut, peach, creamy, sweet - **Odor Threshold:** 30–60 ppb - **Applications:** Coconut, peach, apricot ### gamma-Decalactone - **Aroma Descriptors:** Peach, apricot, creamy, sweet - **Odor Threshold:** 10–20 ppb - **Applications:** Peach, apricot, dairy ### gamma-Undecalactone - **Aroma Descriptors:** Peach, fruity, creamy, fatty - **Odor Threshold:** 10–15 ppb - **Applications:** Peach, fruit blends ### gamma-Octalactone - **Aroma Descriptors:** Coconut, sweet, creamy, nutty - **Odor Threshold:** 10–50 ppb - **Applications:** Coconut, peach, dairy ### gamma-Dodecalactone - **Aroma Descriptors:** Fruity, fatty, peach, coconut - **Odor Threshold:** 7–10 ppb - **Applications:** Coconut, peach, milk fat ### 1,15-Pentadecalactone (Exaltolide) - **Aroma Descriptors:** Musk, sweet, creamy, powdery - **Odor Threshold:** 1–10 ppb (in oil) - **Applications:** Musk perfumery, fine fragrances ### Ambrettolide - **Aroma Descriptors:** Musk, sweet, fruity, floral, ambrette seed - **Odor Threshold:** 1–10 ppb - **Applications:** Musk, floral, fine fragrances --- ## Furans & Furanones ### 5-Methylfurfural - **Aroma Descriptors:** Sweet, caramel, bready, nutty, spicy - **Odor Threshold:** 500–1000 ppb - **Applications:** Caramel, coffee, cocoa, bread ### 2-Acetylfurfural - **Aroma Descriptors:** Sweet, bready, nutty, caramel, smoky - **Odor Threshold:** 100–500 ppb - **Applications:** Coffee, bread, nutty flavors ### Theaspirane - **Aroma Descriptors:** Camphoraceous, woody, herbal, tea-like - **Odor Threshold:** 10–50 ppb - **Applications:** Tea, herbal notes, woody florals ### 2-Methyl tetrahydrofuran-3-one - **Aroma Descriptors:** Caramel, sweet, nutty, roasted - **Odor Threshold:** 50–200 ppb - **Applications:** Caramel, coffee, roasted nuts ### 2-Furanmethanethiol (Furfuryl mercaptan) - **Aroma Descriptors:** Roasted coffee, sulfury, burnt, savory - **Odor Threshold:** 0.01–0.5 ppb (very low) - **Applications:** Coffee, roasted meat, savory flavors ### 2-Methyl-3-tetrahydrofuranthiol - **Aroma Descriptors:** Roasted meat, savory, sulfury, coffee - **Odor Threshold:** 0.01–0.1 ppb - **Applications:** Meat, coffee, savory snacks ### Difurfuryl sulfide - **Aroma Descriptors:** Roasted coffee, sulfurous, nutty, savory - **Odor Threshold:** 0.5–5 ppb - **Applications:** Coffee, roasted flavors ### Maltol - **Aroma Descriptors:** Caramelized sugar, cotton candy, sweet - **Odor Threshold:** 2,000–3,500 ppb - **Applications:** Caramel, strawberry, sweetener enhancer ### Ethyl maltol - **Aroma Descriptors:** Caramel, sweet, fruity, cotton candy - **Odor Threshold:** 50–100 ppb (more potent than maltol) - **Applications:** Strawberry, chocolate, flavor enhancer --- ## Nitrogen Heterocycles (Pyrazines, Pyridines, Thiazoles, Oxazoles) ### Indole - **Aroma Descriptors:** Floral (jasmine) at low concentration, fecal at high concentration - **Odor Threshold:** 0.5–5 ppb - **Applications:** Jasmine, orange blossom, tuberose, floral blends ### 2,3-Dimethyl pyrazine - **Aroma Descriptors:** Nutty, roasted, peanut, cocoa - **Odor Threshold:** 1,000–2,500 ppb - **Applications:** Roasted nuts, coffee, cocoa ### Trimethyl pyrazine - **Aroma Descriptors:** Nutty, potato chip, cocoa, roasted - **Odor Threshold:** 200–900 ppb - **Applications:** Roasted nuts, coffee, chocolate ### Tetramethyl pyrazine - **Aroma Descriptors:** Fermented soy, nutty, coffee, cocoa - **Odor Threshold:** 1,000–5,000 ppb - **Applications:** Soy sauce, miso, coffee, chocolate ### 2-Acetyl pyrazine - **Aroma Descriptors:** Popcorn, nutty, roasted, bready - **Odor Threshold:** 10–50 ppb - **Applications:** Popcorn, roasted nuts, bread, coffee ### 2-Methoxy-3-methyl pyrazine - **Aroma Descriptors:** Roasted, nutty, earthy, peanut - **Odor Threshold:** 5–20 ppb - **Applications:** Peanut, roasted nuts, coffee ### 2-Methoxy-3-ethyl pyrazine - **Aroma Descriptors:** Earthy, nutty, bell pepper, green - **Odor Threshold:** 0.5–2 ppb - **Applications:** Bell pepper, green notes, earthy nuances ### 2-Methoxy-3-isobutyl pyrazine - **Aroma Descriptors:** Bell pepper, green pepper, earthy, pea - **Odor Threshold:** 0.002–0.01 ppb (extremely low) - **Applications:** Bell pepper, galbanum, green vegetable notes ### 2-Isopropyl-4-methyl thiazole - **Aroma Descriptors:** Earthy, nutty, green, tomato leaf - **Odor Threshold:** 1–5 ppb - **Applications:** Tomato leaf, green notes, earthy flavors ### 2-Isobutyl thiazole - **Aroma Descriptors:** Green, tomato leaf, earthy, nutty - **Odor Threshold:** 1–5 ppb - **Applications:** Tomato, green pepper, vegetable flavors ### Pyridine - **Aroma Descriptors:** Pungent, fishy, medicinal, burnt - **Odor Threshold:** 1–10 ppb - **Applications:** Fish, meat, savory flavors; also off-flavor ### 2-Acetyl pyridine - **Aroma Descriptors:** Popcorn, nutty, bready, roasted - **Odor Threshold:** 10–50 ppb - **Applications:** Popcorn, roasted nuts, coffee, bread ### 2,4,5-Trimethyl oxazole - **Aroma Descriptors:** Nutty, roasted, green, vegetable - **Odor Threshold:** 10–100 ppb - **Applications:** Roasted nuts, green vegetable notes --- ## Sulfur Cyclic ### Trithioacetone - **Aroma Descriptors:** Sulfurous, tropical, fruity, passionfruit, cheesy - **Odor Threshold:** 0.001–0.01 ppb (extremely low) - **Applications:** Passionfruit, tropical fruits, cheese ### Ethyl acrylate (Ethyl 2-propenoate) - **Aroma Descriptors:** Pungent, fruity, pineapple, plastic, harsh - **Odor Threshold:** 0.5–2 ppb - **Applications:** Used cautiously in fruit flavors; also a known off-flavor in some alcoholic beverages ### Ethyl cis-4-octenoate - **Aroma Descriptors:** Fruity, juicy, pineapple, waxy, tropical - **Odor Threshold:** 0.5–1 ppb - **Applications:** Pineapple, tropical fruit, citrus --- ### Methyl thiobutyrate - **Aroma Descriptors:** Fruity, sulfurous, cheese, pineapple, tropical - **Odor Threshold:** 1–5 ppb - **Applications:** Pineapple, cheese, tropical fruit ### Methyl 3-methylthiopropionate - **Aroma Descriptors:** Fruity, pineapple, sulfurous, tomato - **Odor Threshold:** 0.5–2 ppb - **Applications:** Pineapple, tomato, tropical fruits ### 3-Methylcyclopentane-1,2-dione - **Aroma Descriptors:** Caramel, maple, sweet, nutty, coffee-like - **Odor Threshold:** 10–50 ppb - **Applications:** Maple, caramel, butterscotch, coffee, tobacco ### Methyl jasmonate A**roma Descriptors:** Floral, jasmine, sweet, tea-like, woody - **Odor Threshold:** 10–20 ppb - **Applications:** Jasmine, tea, floral compositions, fruit blends ### Nerol - **Aroma Descriptors:** Sweet rose, floral, fresh, citrus, slightly green - **Odor Threshold:** 50–100 ppb - **Applications:** Rose, neroli, citrus oils, floral blends ### alpha-Damascenone - **Aroma Descriptors:** Apple, rose, honey, tobacco, fruity, woody - **Odor Threshold:** 0.01–0.05 ppb - **Applications:** Rose, apple, honey, tobacco, wine, tea ### beta-Damascone - **Aroma Descriptors:** Fruity, floral, plum, blackcurrant, woody - **Odor Threshold:** 0.01–0.05 ppb - **Applications:** Blackcurrant, plum, tobacco, floral blends, wine ### Neryl acetate - **Aroma Descriptors:** Floral, rose, sweet, citrus, fresh - **Odor Threshold:** 100–200 ppb - **Applications:** Neroli, bergamot, floral compositions, citrus blends ### Geranyl acetate - **Aroma Descriptors:** Floral, rose, sweet, fruity, lavender-like - **Odor Threshold:** 10–50 ppb - **Applications:** Rose, lavender, citrus, fruity florals ### Citronellyl acetate - **Aroma Descriptors:** Fruity, rose, floral, citrus, sweet - **Odor Threshold:** 20–100 ppb - **Applications:** Rose, citrus, fruity floral blends, geranium ### Linalyl acetate - **Aroma Descriptors:** Floral, lavender, bergamot, sweet, herbaceous - **Odor Threshold:** 100–500 ppb - **Applications:** Lavender, bergamot, floral perfumes, citrus ### Isobornyl acetate - **Aroma Descriptors:** Pine, woody, camphoraceous, herbal, fir needle - **Odor Threshold:** 10–50 ppb - **Applications:** Pine, fir, woody accords, air fresheners, forest notes ###