H. Guth, W. Grosch
1989
Citations
4
Influential Citations
52
Citations
Journal
Fett-lipid
Abstract
Nonane-2,4-dione and 3-mehthylnonane-2,4-dione were identified in reverted soya-bean oil. The odour threshold of the latter compound, which smelled “lard-like, strawy, fruity”, was very low (0.01 ng/1 air) in comparison to that of the nonane-2,4-dione (3.9ng/1 air). Based on its odour properties and the result of an aroma extract dilution analysis, which have been recently reported (Fat Sci. Technol. 90, 332 [1988]), it was concluded that 3-methylnonane-2,4-dione contributed very strongly to the reversion odour of soya-bean oil. 3-Methylnonane-2,4-dione, 3,7-dimethyloctane-2,4-dione, decane-2,5-, -3,5-and- -4,5-dione, 3-oxo- and 5-oxodecanal were prepared as reference for the identification experiments. The spectroscopic (1H-NMR, MS) and odour threshold data are reported.