Volatile Flavor Components in Mash of Takju prepared by using Aspergillus oryzae Nuruks.

Aspergillus oryzae 누룩으로 담금한 탁주 술덧의 발효 과정 중 휘발성 향기성분

Volatile flavor components in the mash of Takjus prepared by using Aspergillus oryzae nuruk were identified by using Gas Chromatography and Gas Chromatography-Mass Spectrometry. Twenty-four esters, 21 alcohols, 10 acids, 9 aldehydes and 4 others were found in the mash of Takju. Thirty six components including 13 esters and 12 alcohols were detected in the beginning of fermentation. Twenty nine components were more detected after second day of fermentation and 68 components were detected after 12 days of fermentation. Thirty five flavor components including 12 alcohols such as ethanol, 2-methyl-1-propanol, 3-methyl-1-butanol and benzeneethanol, 13 esters such as ethyl acetate, ethyl caprylate, ethyl butyrate and isoamyl acetate, 4 aldehydes and 6 acids were usually detected in the fermentation process. Ethanol was predominantly found in the range of $79.86{\sim}89.54%$ as a major component by using relative peak area. 3-Methyl-1-butanol, ethyl caprylate and benzeneethanol were some of the major volatile components through the fermentation respectively. Peak area of 2-methyl-1-propanol, 1-hexanol, 1-dodecanol, ethyl acetate, monoethyl butanoate, acetic acid and isobutylaldehyde among the same group were higher than other components depending upon fermentation time.

Aspergillus oryzae균을 파종하여 만든 누룩으로 담금한 탁주 술덧의 발효과정 중 휘발성 향기성분을 GC와 GC-MS를 사용하여 분석 동정한 결과 ester 24종, alcohol 21종, acid 10종, aldehyde 9종, 기타 4종 등 68종의 향기 성분이 동정되었다. 동정된 향기성분 수는 담금일에 ester 13종, alcohol 12종을 비롯한 총 36종이었으나, 발효 2일에 ester 10종, alcohol 8종을 포함한 29종이 추가 검출되어 65종으로 증가되었다. 발효 12일에는 68종으로 향기 성분수가 최대에 달하였다. ethanol, 3-methyl-1-butanol, 2-methyl-1-propanol, benzeneethanol등 alcohol류 12종, ethyl acetate, ethyl caprylate, ethyl butyrate 등 ester류 13종, acetaldehyde, isobutyl aldehyde등 aldehyde 4종, pentanoic acid , acetic acid등 acid 6종 등 총 35종은 발효 전과정을 통하여 검출되었다. 향기 성분의 면적비율은 ethanol이 $79.86{\sim}89.54%$로 발효 전기간을 통하여 탁주 술덧에서 타 성분 보다 월등히 높았다. ethanol을 제외하고 발효 전과정을 통하여 면적비율이 높은 성분은 ethyl caprylate, 3-methyl-1-butanol, benzeneethanol이었다. 이외 발효기간에 따라서 2-methyl-1-propanol, 1-hexanol, 2,3-butanediol(D.L), 1-dodecanol, 2-phenylethyl acetate, ethyl acetate, monoethyl butanoate, diethyl succinate, ethylbenzoic acid, acetic acid, isobutylaldehyde등의 성분도 동종 계열간의 향기 성분중 면적비율이 다소 높게 나타나기도 하였다.