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Stability of Anti-Yeast Activities and Inhibitory Effects of Defatted Green Tea Seed Extracts on Yeast Film Formation

탈지 녹차씨 추출물의 항효모 활성 안정성 및 산막 형성 억제능 평가

  • Yang, Eun Ju (Food Research Center, Jeonnam Bioindustry Foundation) ;
  • Seo, Ye-Seul (Food Research Center, Jeonnam Bioindustry Foundation)
  • 양은주 ((재)전남생물산업진흥원 식품산업연구센터) ;
  • 서예슬 ((재)전남생물산업진흥원 식품산업연구센터)
  • Received : 2016.12.26
  • Accepted : 2017.02.27
  • Published : 2017.03.31

Abstract

Water and 75% ethanol extracts were prepared from defatted green tea seeds and evaluated for their anti-yeast activities. The antimicrobial activities of defatted green tea seed extracts (DGTSEs) were tested against food-spoilage bacteria, yeasts, and molds. DGTSEs exhibited antimicrobial activities with minimum inhibitory concentrations of $39{\sim}1,250{\mu}g/mL$ against three bacteria, two molds, and all tested yeast strains. Ethanol extract showed higher antimicrobial activity than water extract. The stability of anti-yeast activities of DGTSEs was examined under different conditions of temperature, pH, and NaCl concentrations. The anti-yeast activities of DGTSEs were stable at pH 3~9, 0~20% NaCl, and $100^{\circ}C$ for 30 min. However, anti-yeast activities of DGTSEs decreased upon heating at $70^{\circ}C$ for 24 h or $121^{\circ}C$ for 15 min. DGTSEs were applied to food models to determine their inhibitory effects on yeast film formation. Water and 75% ethanol extracts were effective in preventing yeast film formation at concentrations more than 156 and $39{\mu}g/mL$ in soy sauce, 156 and $78{\mu}g/mL$ in pickle sauce, and 78 and $39{\mu}g/mL$ in kimchi, respectively.

탈지 녹차씨 추출물을 식품에 적용할 수 있는 보존 소재로 개발하기 위해 물 또는 75% 에탄올 추출물을 이용하여 항효모 활성을 평가하였다. 탈지 녹차씨 추출물의 항균 스펙트럼을 조사한 결과 세균과 곰팡이에서는 일부 지시균을 저해했지만, 효모 지시균 5종에 대해서는 모두 생육 저해 활성을 나타내어 항효모 활성이 우수함을 확인하였다. 추출 용매에 따른 활성은 75% 에탄올 추출물이 물 추출물에 비해 2배 정도 활성이 우수하였다. 탈지 녹차씨 추출물의 온도, pH, NaCl 처리에 대한 항효모 활성 안정성을 평가한 결과, 물과 75% 에탄올 추출물 모두 pH 3~9와 0~20% NaCl 처리에 안정하였으며, 온도에 대한 영향은 $70^{\circ}C$, 24시간 및 $121^{\circ}C$, 15분 처리에 항효모 활성이 2배 정도 감소하였으나 다른 온도 처리에는 모두 안정하였다. 산막효모인 P. membranifaciens가 첨가된 식품 모델에 탈지 녹차씨 추출물을 농도 별로 처리한 후 산막 형성이 억제되는지 평가하였다. 물과 75% 에탄올 추출물은 간장에서 각각 $156{\mu}g/mL$, $39{\mu}g/mL$, 장아찌 소스에서 각각 $156{\mu}g/mL$, $78{\mu}g/mL$ 이상의 농도에서 산막 형성을 억제하였다. 김치에서 물 추출물은 $78{\mu}g/mL$ 이상, 75% 에탄올 추출물은 $39{\mu}g/mL$ 이상의 농도에서 농도 의존적으로 산막 형성 억제능이 나타났다. 항효모 활성 안정성이 우수하며 실제 식품에서 산막효모를 효과적으로 억제하는 탈지 녹차씨 추출물은 효모의 부패를 저해할 수 있는 천연 보존 소재로서 활용 가능성이 높을 것으로 기대된다.

Keywords

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