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The Antioxidative and Antibrowning Effects of Citrus Peel Extracts on Fresh-cut Apples

Citrus 과피 추출물의 항산화 및 사과 슬라이스에 대한 항갈변 효과

  • Park, Miji (Plant Resources Research Institute, Duksung Women's University) ;
  • Kim, Gun-Hee (Plant Resources Research Institute, Duksung Women's University)
  • 박미지 (덕성여자대학교 건강기능신소재학과) ;
  • 김건희 (덕성여자대학교 건강기능신소재학과)
  • Received : 2013.04.01
  • Accepted : 2013.07.01
  • Published : 2013.10.31

Abstract

This study was designed to evaluate the usability of the following citrus peel extracts (CPEs): Citrus sinensis (orange), C. unshiu (mandarin orange), C. limon (lemon), and C. paradise (grapefruit) as natural antibrowning agents. Overall, 0.1% of the CPEs were effective in reducing the browning of apple slices. The appearance of apple slices dipped in C. limon peel extracts (LPE) were found to be excellent and their Hunter L and ${\Delta}E$ values were similar to the values obtained when apple slices were dipped in ascorbic acid. The pH values of the different CPEs were not significantly different from each other, but were higher than that of ascorbic acid. LPE was found to possess the highest total phenolic content, flavonoid content, DPPH radical scavenging activity, and copper ($Cu^{2+}$) chelating activity. All these results suggest that citrus peel extracts, especially lemon peel extract, can be used as natural antibrowning agents.

본 연구는 citrus 과피의 천연 갈변저해제로서 사용가능성을 알아보았다. Citrus 중 생과 및 가공에서 가장 많이 이용되고 있는 오렌지(C. sinensis), 감귤(C. unshiu), 레몬(C. limon), 자몽(C. paradisi)의 과피를 80% 에탄올로 추출 농축하였다. 각 추출물 0.05-5%에 사과 슬라이스를 침지하여 외관 및 색도 변화를 관찰한 후, pH와 페놀 및 플라보노이드 함량을 조사하였으며, DPPH radical 소거 활성과 $Cu^{2+}$ 킬레이트 활성을 측정하였다. 사과 슬라이스 침지의 경우 다양한 농도의 추출물 중 대체로 0.1%에서 우수한 갈변저해효과를 보였으며 4종의 citrus 과피 중 레몬 과피추출물이 가장 우수한 효과를 보였다. pH의 경우 4종의 citrus 과피 추출물 간의 유의적 차이는 없었으며, ascorbic acid에 비해 높은 값을 보였고, 총 페놀 및 플라보노이드 함량의 경우 레몬 과피 추출물이 가장 높게 측정되었다. DPPH radical 소거활성과 $Cu^{2+}$ 킬레이트 활성 모두 레몬 과피 추출물이 가장 우수하였고, 자몽 과피 추출물이 가장 낮은 활성을 보였다. 사과 슬라이스 침지 결과와 radical 소거 및 킬레이트 활성이 페놀 및 플라보노이드와 유사한 경향을 보이고 있어 이 물질들이 항산화 및 갈변저해 효과를 나타낸다고 추정된다. Citrus 과피 추출물의 항산화능은 농도 의존적이었지만 갈변저해효과는 mono 및 diphenol 과 같은 기질로 작용하는 페놀성 물질의 일부와 추출물 자체가 띠는 색으로 인해 0.1-0.5%에서 효과적이었다. 따라서 본 연구를 통해 citrus 과피 특히, 레몬 과피 추출물의 항산화와 갈변저해효과를 확인하였고, 천연 갈변저해제로서의 사용 가능성을 제시하였다.

Keywords

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