EFFECT OF FAT-CONTENT OIL ODOR INTENSITY OF 3 AROMA COMPOUNDS IN MODEL EMULSIONS - DELTA-DECALACTONE, DIACETYL, AND BUTYRIC-ACID

The purpose of this investigation is to try to explain the odor intens ity of three aroma compounds in model emulsions using physicochemical measurements (liquid/liquid partition coefficients and vapor/liquid pa rtition coefficients) and to evaluate how odor intensity is affected b y the oil content and the pH of the emulsion. The aroma compounds chos en for this study were diacetyl, delta-decalactone and butyric acid. T he physicochemical analyses agree with the sensory data. Hydrophilic m olecules (diacetyl and butyric acid) are all the more odorant as the o il content is high. In contrast, odor of hydrophobic molecules (delta- decalactone) is more pronounced in aqueous media. The odor and the vap or/liquid partition coefficient of butyric acid are influenced by pH. This study also provides the means to predict the vapor/liquid partiti on coefficient of a compound in an oil/water emulsion on the basis of a few physical measurements.