Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Characteristics of Umbilicaria esculenta Yakju Added with Grapefruit Seed Extract during Storage

자몽씨 추출물을 첨가한 석이버섯주의 저장 중 품질 특성

  • Received : 2015.10.05
  • Accepted : 2015.12.08
  • Published : 2016.02.29
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Abstract

This study was performed to investigate changes in characteristics of Umbilicaria esculenta Yakju added with 0.5% and 1% grapefruit seed extracts (GSE) during storage for 75 days at $25^{\circ}C$ and 165 days at $4^{\circ}C$. Quality characteristics of pH, titratable acidity, turbidity, total aerobic microbes, and ethanol, glucose, acetic acid, and lactic acid contents were analyzed. Control group showed sharply increased pH, titratable acidity, turbidity, and acetic acid and lactic acid has contents while the 0.5% and 1% GSE groups added to Yakju did not show significant changes in pattern (P<0.05). Total aerobic microbes increased rapidly during storage from 15 days in the control group, and the 0.5% and 1% GSE groups showed gradually increased total aerobic microbes from 30 days of storage compared to the control group (P<0.05). In addition, in all test groups, coli, yeast, and fungus were not detected. Ethanol content slightly increased during storage and glucose content slightly decreased, but there were no large changes during storage between the control group and GSE groups. Therefore, 3 months and $4^{\circ}C$ are considered safe for 6 months of storage, and GSE is effective to improve shelf-life and quality improvement of Yakju.

석이버섯과 한방재료를 첨가하여 만든 숙성된 석이버섯주에 grapefruit seed extract(GSE)를 0.5%, 1% 첨가하여 $4^{\circ}C$는 165일간, $25^{\circ}C$ 75일간 저장하면서 약주의 저장성과 품질 특성에 미치는 영향을 조사하였다. 품질 특성은 pH, 총산도, 탁도, 일반세균수 및 ethanol, glucose, acetic acid, lactic acid 함량을 분석하였다. GSE 무첨가 약주는 저장 중 pH, 총산도, 탁도, acetic acid, lactic acid가 급격하게 증가한 반면에 GSE 0.5%, 1% 첨가 약주는 미미하게 증가하여 큰 변화 양상을 보이지 않았으며 GSE 무첨가 대조군과 유의적인 차이를 보였다(P<0.05). 일반세균수는 대조군보다 GSE 첨가군에서 유의하게 적었으며(P<0.05), 모든 시험군에서 대장균, 효모 곰팡이는 검출되지 않았다. Ethanol 함량은 저장 중 조금씩 증가하였고, glucose 함량은 저장 중 약간 감소하였으나 저장 중 큰 변화는 없었으며, ethanol, glucose 함량 모두 대조군과 GSE 첨가군의 유의적인 차이는 없었다. 따라서 식품규격에 따라 품질 유지기한이 $25^{\circ}C$는 3개월, $4^{\circ}C$는 6개월까지 섭취가 가능할 것으로 판단되며 이로써 GSE는 약주의 저장성 향상 및 품질 증진에 효과적인 것으로 사료된다.

Keywords

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