Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Quality Properties of Jujube Yakju Based on the Adding Rate of Dried Jujube and Storage Periods

건조대추 첨가비율 및 저장기간에 따른 대추약주의 품질특성

  • Choi, Jeong-Sil (Fermented Food Science Division, National Academy of Agricultural Science) ;
  • Yeo, Soo-Hwan (Fermented Food Science Division, National Academy of Agricultural Science) ;
  • Choi, Ji-Ho (Fermented Food Science Division, National Academy of Agricultural Science) ;
  • Choi, Han-Seok (Fermented Food Science Division, National Academy of Agricultural Science) ;
  • Jeong, Seok-Tae (Fermented Food Science Division, National Academy of Agricultural Science)
  • 최정실 (국립농업과학원 발효식품과) ;
  • 여수환 (국립농업과학원 발효식품과) ;
  • 최지호 (국립농업과학원 발효식품과) ;
  • 최한석 (국립농업과학원 발효식품과) ;
  • 정석태 (국립농업과학원 발효식품과)
  • Received : 2012.10.11
  • Accepted : 2013.02.14
  • Published : 2013.02.28
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Abstract

This study was conducted not only to investigate the effects of rate of addition of dried jujube to Yakju (0, 0.5, 1.0, 1.5, 2.0 percent) but also to examine the quality changes in jujube Yakju during its storage (for 75 days at $35^{\circ}C$). The results showed no significant differences in pH, total acidity, soluble solids, and anthocyanin and alcohol contents of the Yakju right after its fermentation. With the increase in the amount of jujube that was added, the lightness of the jujube Yakju changed from 93 to 94, its redness decreased, and its yellowness significantly increased. The jujube Yakju that was fermented with 1.5-percent dried jujube had high sensory evaluation (selection rate) scores for color, flavor, taste and overall acceptability. It had no significant changes in pH and total acidity during its storage after its heat treatment. Its soluble solids contents tended to decrease with its heat treatment and to increase in its storage period. With respect to its color changes during its storage, the higher the ratio of the jujube that was added, the longer the storage period was, the lightness (L) and redness (a) decreased and the yellowness (b) increased. The polyphenol contents depended on the rate of addition of the dried jujube, but were not affected by the heat treatment and storage period. The organic acids in jujube Yakju were citric acid, succinic acid, lactic acid, malic acid and acetic acid.

건조대추 첨가비율을 달리하여(0, 0.5, 1.0, 1.5, 2.0%) 발효시킨 대추약주의 품질 특성과 열처리 후 저장기간 중의 품질 변화에 대해 살펴보았다. 대추 첨가비율이 높을수록 pH, 총산, 가용성고형분, 알코올 생성에는 영향을 주지 않았다. 대추약주의 색도 중 L값은 대추 첨가비율이 높을수록 93~94 정도로 매우 맑은 편이었으며, a값은 낮아졌고 b값은 유의적으로 높아지는 것으로 나타났다. 대추 약주의 폴리페놀 함량은 건조대추의 첨가비율이 높을수록 유의적으로 증가되었다. 대추약주의 안토시아닌 함량은 처리별 유의적인 차이가 없었다. 건조대추 첨가비율을 달리한 대추 약주에 대한 기호도 검사 결과, 술덧량에 대추를 1.5% 첨가 하였을 때 우수한 결과를 보였다. 열처리 후 저장 중 대추약주의 pH나 총산에 있어서, 열처리나 저장기간에 따라 처리별 큰 차이는 없었다. 가용성고형분 함량은 열처리함에 따라 감소하는 경향을 보였으며, 저장기간이 증가할수록 소폭 증가하는 경향을 보였다. 대추약주의 저장 중 색의 변화에 있어서, 대추 첨가비율이 높고 저장기간이 길어질수록 L값과 a값은 감소하는 것으로 나타났으며 b값은 각 처리구에서 증가되는 것으로 나타났다. 대추약주의 저장 중 폴리페놀 함량은 대추첨가비율이 높아짐에 따라 증가하였다. 대추약주에서 검출된 유기산은 구연산(citric acid), 호박산(succinic acid), 젖산(lactic acid), 사과산(malic acid), 초산(acetic acid) 이었으며, 구연산이 130~150 mg%, 젖산이 50~60 mg% 정도 함유되어 있었다.

Keywords

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