CHEMICAL STRUCTURE-ODOR CORRELATION IN SERIES OF SYNTHETIC METHYLENE INTERRUPTED N-NONADIEN-1-OLS

Chemical structure-odor correlations in all the isomers of the purifie d n-nonadien-1-ols were analyzed by treating the data obtained statist ically with the principal component analysis method (Sakoda et at, 199 5; Cramer et al, 1988) in comparison with those of n-nonen-1-ols. The odor profiles of the n-nonadien-1-ols were attributable largely to the geometries of the isomers, compared with n-nonen-1-ols (Sakoda et al. , 1995). With the principal component analysis, the odor profiles of t he series of the dienols were successfully integrated into the first a nd the second principal components. The first component (PC 1) consist ed of combined characteristics of fruity, fresh, sweet, herbal and oil y-fatty, and the second component (PC 2) leaf or grassy and vegetable- like. Of the methylene interrupted dienol isomers, (2E,6Z)- and (3Z,6Z )-nonadien-1-ols which are natural products and have (6Z) in the same, deviated markedly from the other isomers as seen in (6Z)-nonen-1-ol o f n-nonen-1-ols. That suggests that the double bond of (omega 3Z) was an important factor for natural characteristic odor.