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Odor Properties & Molecular Visualization

Aldehydes

DETECTION THRESHOLDS
&
Molecular Structures 

Acetaldehyde ...C2H40
Odor Detection Threshold (in water) = 8.7 ppb
Pungent, breathtaking; in dilution a nutty alcoholic note

Propionaldehyde...C3H60
Odor Detection Threshold (in water) = 9.5 ppb
Breathtaking green acetaldehyde-like odor; green-coffee taste

Butyraldehyde...C4H80
Odor Detection Threshold (in water) = 9 ppb
In high dilution, a fruity, banana-like, green odor & taste

Pentanal...C5H100
Odor Detection Threshold (in water) = 12 ppb
Strong, acrid, pungent odor; chocolate & nut-like below 10ppm

Hexanal...C6H120
Odor Detection Threshold (in water) = 4.5 ppb
Strong, penetrating, fatty-green, grassy unripe fruit odor

Heptanal...C7H140
Odor Detection Threshold (in water) = 3 ppb
Fatty; in dilution sweet, fruity, nutty, fatty-cognac like

Octanal...C8H160
Odor Detection Threshold (in water) = 0.7 ppb
Fatty-fruity odor; sweet, citrus-orange-fatty taste

Nonanal...C9H180
Flavor Detection Threshold (in water) = 1 ppb
Fatty-floral-rose, waxy odor; citrus taste in dilution

Decanal...C10H200
Odor Detection Threshold (in water) = 0.1 ppb
Strong, penetrating, sweet, orange peel odor; citrus taste

Undecanal...C11H220
Odor Detection Threshold (in water) = 5 ppb
Sweet, fatty, waxy-floral-citrus odor; fatty citrus taste

Dodecanal...C12H240
Odor Detection Threshold (in water) = 2 ppb
Sweet, waxy-fatty-citrus herbaceous odor; in dilution: violet

Tridecanal...C13H260
Odor Detection Threshold (in water) = NA
Waxy, citrus, grapefruit peel, slightly floral

Myristaldehyde...C14H280
Flavor Detection Threshold (in water) = 60 ppb
Fatty, waxy, citrus odor; citrus taste on dilution

Data abstracted from Flavor-Base 98
Copyright John C. Leffingwell 1989-98
Leffingwell & Associates

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