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Effect of Addition of Ethanol on the Quality of Kimchi Paste

에탄올 첨가가 김치 양념의 품질에 미치는 영향

  • Kang, Miran (Industrial Technology Research Group, Research and Development Division, World Institute of Kimchi) ;
  • Jung, Hyemin (Industrial Technology Research Group, Research and Development Division, World Institute of Kimchi) ;
  • Seo, Hye-Young (Industrial Technology Research Group, Research and Development Division, World Institute of Kimchi)
  • 강미란 (세계김치연구소 연구개발본부 산업기술연구단) ;
  • 정혜민 (세계김치연구소 연구개발본부 산업기술연구단) ;
  • 서혜영 (세계김치연구소 연구개발본부 산업기술연구단)
  • Received : 2015.10.27
  • Accepted : 2015.12.16
  • Published : 2015.12.31

Abstract

This study was conducted to evaluate the effects of ethanol on the prolongation of the shelf-life of kimchi paste. Kimchi paste was prepared by adding 0.5~3.0% ethanol, and then stored at $4^{\circ}C$ for 35 days. The retardation of kimchi paste fermentation was evaluated by measuring chemical, microbial, and sensory characteristics. Titratable acidity and pH showed a slight difference, depending on the ethanol concentration. The titratable acidity showed the low content in kimchi paste with 3.0% ethanol during fermentation, whereas the pH showed a reverse tendency, indicating that fermentation was inhibited under a high ethanol concentration. The changes in the sugar-reduced contents were similar to that of the pH. The growth of microorganisms such as total aerobic bacteria, lactic acid bacteria, yeasts and molds in kimchi paste during fermentation were inhibited by ethanol, and the addition of 3.0% ethanol was most effective to inhibit the microbial growth. The number of coliform bacteria was decreased during fermentation of kimchi paste and not detected in any sample at 35 days, except for kimchi paste with 3.0% ethanol. In sensory evaluation, the addition of 0.5~1.5% ethanol in kimchi paste was showed no significant difference on sensory properties compared to the kimchi paste without ethanol (p<0.05). As a result, it is considered that the addition of 1.5% ethanol is the most appropriate to maintain the quality of kimchi paste, without the changing the flavor.

김치 양념의 유통 중 품질 유지기한 연장 효과를 확인하기 위해 농도별 에탄올이 첨가된 양념을 $4^{\circ}C$에 35일간 저장하면서 pH, 산도, 환원당, 미생물 수, 및 관능적 특성을 확인하였다. 김치 양념에 에탄올을 0~3.0% 첨가하여 pH 변화를 조사한 결과 에탄올 함량이 높을수록 김치 양념의 발효가 지연되어 pH 감소가 적었다. 산도의 경우 에탄올 무첨가 김치 양념은 0.87%에서 1.57%까지 증가한 반면 3.0% 에탄올 첨가 김치 양념은 0.73%에서 0.88%로 에탄올 첨가는 김치 양념의 산도 증가를 억제하였다. 3.0% 에탄올 첨가는 김치 양념의 일반세균수, 유산균수, 효모와 곰팡이 생성을 효과적으로 억제하였으나 pH 저하 지연으로 대장균군 수 감소가 지연되었다. 관능평가에서는 0.5~1.5% 에탄올 첨가는 에탄올 무첨가 김치 양념과 비교하여 유의적인 차이를 보이지 않았다. 하지만 2.0%이상 에탄올 첨가시 에탄올 무첨가 김치 양념에 비하여 관능적 선호도가 낮아짐을 확인하였다. 따라서 이화학적 특성, 미생물학적 특성 및 관능검사 결과를 고려할 때 1.5% 에탄올 첨가가 김치 양념의 관능적 선호도를 유지하면서, 김치 양념의 발효를 지연시키는 최적 첨가량으로 사료되었다.

Keywords

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