Journal of the Korean Society of Food Culture (한국식생활문화학회지)

Korean Society of Food Culture (한국식생활문화학회)
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A study on the Antioxidative and Antimicrobial Activities of the Citrus Unshju peel Extracts

감귤과피 추출물의 항산화 및 항균 효과에 관한 연구

  • Ahn, Myung-Soo (Department of Food and Nutrition, Sungshin Women’s University) ;
  • Seo, Mi-Sook (Department of Food and Nutrition, Sungshin Women’s University) ;
  • Kim, Hyun-Jeung (Department of Food and Nutrition, Sungshin Women’s University)
  • 안명수 (성신여자대학교 식품영양학과) ;
  • 서미숙 (성신여자대학교 식품영양학과) ;
  • 김현정 (성신여자대학교 식품영양학과)
  • Published : 2007.09.30
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Abstract

Antioxidative and antimicrobial activities were carried out on the Citrus Unshju peel solvent extracts in order to discover new functional activities. The amounts of polyphenol in 70% metanol extract (MtEx) was measured as 836.8 mg% in Citrus Unshju peel. The EDA (electron donating ability) of 0.01, 0.02 and 0.1% MtEx in Citrus Unshju peel were measured as levels of 81.3, 86.0 and 89.6%. The nitrite scavenging effects of Citrus peel were also determined as the levels of 34.4% (pH 1.2) and 19.5% (pH 7.0). The pH of react solution was more acidic, the nitrite scavenging effect was more increased. The order of antioxidatives was shown as TBHQ > BHT > TOC > ChEx > EaEx > EtEx > WaEx > Control in corn germ oil and TBHQ > ChEx > EaEx > BHT > EtEx > WaEx > TOC > Control in canola oil. A number of the extracts were certified to have antimicrobial activities for a small number of micro-organisms, similar gram negative and positive micro-organisms. According to the results above, it was summerized that Citrus Unshju peel had the higher total polyphenol, EDA, nitrite scavenging effects and antimicrobial activities. Also isolated extract from ChEx and EaEx had high antioxidative, these effects were very similar to that of ${alpha}$-tocopherol and BHT. It would be proposed that Citrus peel can become a new natural source for antioxidative agents in future food industry.

본 연구 결과 동결건조된 감귤과피 70% 메탄올 추출물의 총 폴리페놀 함량은 836.8 ㎎%였으며 감귤과피 추출물 0.01, 0.02와 0.1%의 EDA는 각각 89.6, 86, 81.3%로 높았으며 아질산염 소거능은 pH 1.2에서 34.4%, pH 7.0에서 19.5%를 나타내어 산성 영역에서 높은 소거작용을 보였다. 또한 이들 추출물의 항산화효과는 옥배유의 경우 TBHQ > BHT > TOC > ChEx > EaEx > EtEx > WaEx > Control 순이었고, 채종유의 경우 TBHQ > ChEx > EaEx > BHT > EtEx > WaEx > TOC > Control 순이었다. 두 유지모두에서 에틸아세이트추출물(EaEx)과 클로로포름추출물(ChEx)이 에탄올추출물(EtEx)과 물추출물(WaEx) 보다 항산화 효과가 높았으며 첨가농도가 증가함에 따라 항산화 효과도 증가하는 경향을 보였다. 그리고 감귤과피의 각 용매별 추출물의 공액이중산가도 에틸아세테이트추출물(EaEx)과 클로로포름추출물(ChEx)이 높았으며 이들의 항산화 효과는 TBHQ보다는 낮았으나 BHT, tocopherol과 비교하였을 때 거의 유사하거나 좀 더 높은 경향을 보였다. 한편 감귤과피 추출물은 우수한 항균력을 보여주었고 농도가 상승함에 따라 항균효과도 상승하였으며 이 효과는 그램 양성, 음성균주에서 고르게 나타나 천연 항균소재로서의 이용가능성을 확인하였다. 이상의 결과에서 감귤 과피는 총 폴리페놀 함량과 전자공여능 활성이 높아 항산화효과와 항균효과가 우수하게 나타나 감귤 과피의 기능성 이용도가 매우 높을 것으로 생각되며 감귤 가공 후 생기는 부산물들의 식품산업에서의 유용성도 높을 것으로 사료된다.

Keywords

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