Differences in quality and components of putrefactive
awazmori and normal
awamori were investigated. Putrefactive
awamori contained more total acid, total aldehyde and total ester than normal
awamori and had lower pH.
The acidity and pH of putrefactive
awaznori were not markedly changed by long-term storage. The characteristic odor of putrefactive
awamori was not diminished during storage, and storage did not improve the quality of putrefactive
awamori. The total content of lactic acid, formic acid, acetic acid and propionic acid was greater than 96% of total organic acids, which was not influenced by long-term storage. The content in normal
awamori was about 60%.
The content of higher alcohols (C
3_??_C
5) was decreased by putrefaction of
awamori. Thus, slightly putrefied
awamori contained more higher alcohols (C
3_??_C
5) than heavily putrefied
awamori. In contrast, higher contents of low-boiling carbonyl compounds were found in putrefactive
awamori than in normal
awamori. The ratio of higher alcohols (C
3_??_C
5) to low-boiling carbonyl compounds was about five times greater in putrefactive than in normal
awamori.
A higher content of ethyl acetate and a lower quantity of other ester compounds were found in putrefactive
awamori. The dimethyl sulfide content of putrefactive
awamori was 0.03 of normal
awamori; the compound subsequently disappeared during storage.
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