Fresh Fruit Bouquets

An aroma compound , also known as odorant , aroma , fragrance or flavor , is a chemical compound that has a smell or odor. A chemical compound has a smell or odor when two conditions are met: the compound needs to be volatile, so it can be transported to the olfactory system in the upper part of the nose, and it needs to be in a sufficiently high concentration to be able to interact with one or more of the olfactory receptors.

Aroma compounds can be found in food, wine, spices, perfumes, fragrance oils, and essential oils. For example, many form biochemically during ripening of fruits and other crops. In wines, most form as byproducts of fermentation. Odorants can also be added to a dangerous odorless substance, like natural gas or hydrogen, as a warning. As well many of the aroma compounds plays a significant role in the production of flavorants, which are used in the food service industry to flavor, improve and increase the appeal of their products.

Aroma compounds classified by structure

Esters

Terpenes

Cyclic terpenes

Aromatic

Amines

Other aroma compounds

Alcohols

• Furaneol (strawberry)
• 1-Hexanol (herbaceous, woody)
• cis -3-Hexen-1-ol (fresh cut grass)
• Menthol (peppermint)

Aldehydes

• Acetaldehyde (pungent)
• Hexanal (green, grassy)
• cis -3-Hexenal (green tomatoes)
• Furfural (burnt oats)

Esters

• Fructone (fruity, apple-like)
• Hexyl acetate (apple, floral, fruity)
• Ethyl methylphenylglycidate (strawberry)

Ketones

• Dihydrojasmone (fruity woody floral)
• Oct-1-en-3-one (blood, metallic, mushroom-like)
• 2-Acetyl-1-pyrroline (fresh bread, jasmine rice)
• 6-Acetyl-2,3,4,5-tetrahydropyridine (fresh bread, tortillas, popcorn)

Lactones

• gamma-Decalactone intense peach flavor
• gamma-Nonalactone coconut odor, popular in suntan lotions
• delta-Octalactone creamy note
• Jasmine lactone powerful fatty fruity peach and apricot
• Massoia lactone powerful creamy coconut
• Wine lactone sweet coconut odor
• Sotolon (maple syrup, curry, fenugreek)

Thiols

• Ethanethiol, commonly called Ethyl mercaptan (added to propane or other liquefied petroleum gases used as fuel gases)
• Grapefruit mercaptan (grapefruit)
• Methanethiol, commonly called Methyl mercaptan (Durian or leek)
• 2-Methyl-2-propanethiol, commonly called tertiary-butyl mercaptan is added as a blend of other components to natural gas used as fuel gas.

Miscellaneous compounds

• Methylphosphine and dimethylphosphine (garlic-metallic, two of the most potent odorants known)

• Nerolin (orange flowers)
• Tetrahydrothiophene (added to natural gas)
• 2,4,6-Trichloroanisole (cork taint)
• Substituted pyrazines

Aroma compound receptors

Animals which are capable of smell detect aroma compounds with olfactory receptors. Olfactory receptors are cell membrane receptors on the surface of sensory neurons in the olfactory system which detect air-borne aroma compounds.

In mammals, olfactory receptors are expressed on the surface of the olfactory epithelium in the nasal cavity.

Safety

'Fragrance' was voted Allergen of the Year in 2007 by the American Contact Dermatitis Society. The composition of fragrances are usually not disclosed in the label of products, hiding the actual chemicals of the formula, which raises concerns between some consumers.

References

1. ^ ^{a b} D. Glindemann, A. Dietrich, H. Staerk, P. Kuschk, (2005). "The Two Odors of Iron when Touched or Pickled: (Skin) Carbonyl Compounds and Organophosphines". Angewandte Chemie International Edition 45 (42): 7006–7009. doi: 10.1002/anie.200602100 .  
2. ^ Toxic chemicals linked to birth defects are being found at alarming levels in women of childbearing age

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