초록
멥쌀로 담금한 주모 첨가 몇 무첨가의 탁주 술덧을 발효 과정별로 고체상 추출법으로 추출 농축한 후 극성 column을 사용하여 GC 및 GC-MS로 휘발성 향기성분을 분석, 동정한 결과는 다음과 같다. 멥쌀 탁주 술덧에서 alcohol 10종, ester 9종, acid 2종, aldehyde 7종 등 28종의 향기성분이 동정되었다. 동정된 향기성분은 담금 직후에 $3{\sim}7$종 이었으나 16일에 $26{\sim}28$종으로 증가되었고 주모 첨가 탁주 술덧에서 담금 직후와 발효 3일에 향기성분의 수가 많았다. 담금직후 주모 첨가 탁주 술덧에서 ethyl acetate, ${\beta}-phenylethyl$ acetate, acetic acid의 3종만 검출되었으나 주모 첨가 탁주 술덧에서는 이들 성분 외에 ethyl alcohol 등 4종의 alcohol류가 추가되어 주모에서 유래된 향미성분의 영향으로 본다. 탁주 술덧의 발효 전과정을 통하여 시험구에서 공통으로 검출된 향기성분은 ethyl acetate, ${\beta}-phenylethyl$ acetate, acetic acid였다. 향기성분의 상대적함량(면적비율, peak area %)은 발효 기간에 따라 차이가 있으나 ethyl alcohol, iso-amyl alcohol, hexenyl alcohol, ethyl acetate, ${\beta}-phenylethyl$ acetate, ${\beta}-phenylethyl$ alcohol의 면적비율이 높아 주모 첨가 및 주모 무첨가 탁주 술덧중 휘발성 향기의 주성분들로 나타났다. 주모 첨가의 탁주 술덧에서 ethyl alcohol 향기성분중 상대적함량이 가장 높았으나 주모 무첨가 탁주의 술덧에서 담금 직후 alcohol류가 검출되지 않았고 발효 16일에 hexenyl alcohol의 상대적함량이 가장 높았다. 또한 주모 무첨가 탁주에서 발효 3일까지 ester류의 생성이 극히 적어 주모첨가 탁주와 다른 점을 보여주었다.
The volatile flavor components in mash of nonglutinous rice Takju brewed with or without addition of the starter were determined by GC and GC-MS using polar column. Various kinds of volatile components including alcohols(10), esters(9), organic acids(2) and aldehydes(7) were found in mash of nonglutinous rice Takjus. At the beginning stage of fermentation, 3 to 7 volatile flavor components were detected. The number of volatile flavor components were increased to 26 of to 28 after 16 days fermentation. Early in the brewing, just 3 kinds of flavor components including ethyl acetate, ${\beta}-phenylethyl$ acetate and acetic acid were detected in mash of nonglutinous rice Takju without the addition of the starter, when starter is added additional compounds of alcohol including ethanol were detected, which is suggested to be the effect of flavors originated from the starter. The common flavor compounds through the entire process of fermentation in mash of nonglutinous rice Takju were ethyl acetate, ${\beta}-phenylethyl$ acetate and acetic acid. The relative amount(peak area %) of flavor components were changed with the fermentation period, but the major volatile flavor components were ethyl alcohol, iso-amyl alcohol, hexenyl alcohol, ethyl acetate, ${\beta}-phenylethyl$ acetate and ${\beta}-phenylethyl$ alcohol. The relative amount(peak area %) of ethyl alcohol was the highest in mash of nonglutinous rice Takju with addition of starter. When the starter was not added in the mash of nonglutinous rice Takju, any alcoholic components were not detected in the early stage of fermentation. But the percent of peak area hexenyl alcohol was the highest after 16 days fermentation. Especially few sorts of ester were detected in mash of nonglutious rice Takju without addition of starter by 3 days fermentation.