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Phenolics Level and Antioxidant Activity of Methanol Extracts from Different Plant Parts in Youngia sonchifolia

고들빼기 부위별 메탄올 추출물의 폴리페놀 함량 및 항산화성 연구

  • Chon, Sang-Uk (EFARINET Co. LTD., BI Center, Chosun University) ;
  • Kang, Jong-Goo (Department of Horticulture, Sunchon National University)
  • 천상욱 (조선대학교 BI센터 (주)이파리넷) ;
  • 강종구 (순천대학교 원예학과)
  • Received : 2012.08.06
  • Accepted : 2013.01.21
  • Published : 2013.03.31

Abstract

Proximate composition, total phenolics and total flavonoids level, DPPH radical scavenging activity, and cytotoxicity were determined in the methanol extracts of different plant parts of Youngia sonchifolia at reproductive growth stage. Crude protein and crude fat were present as the highest amount in flowers, and crude fiber in the stems and roots. The highest content of phenolics [mg ferulic acid equivalents (FAE) $kg^{-1}$ dry weight (DW)] was found in flowers (highest) and followed by leaves, stems and roots (lowest). Flavonoids [mg rutin equivalents $kg^{-1}$ DW] level, however, showed the highest in leaf extracts and lowest in root extracts. The antioxidant potential of the methanol extracts from the plants dose-dependently increased DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical scavenging activity (%). DPPH radical scavenging activity were highest in root extracts ($IC_{50}=1,135.6\;mg\;kg^{-1}$) and followed by leaf, stem and flower extracts. By way of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay, methanol extracts of roots showed the highest anticancer activity on human cancer cell line Calu-6 for human pulmonary carcinoma ($IC_{50}=196.3\;mg\;kg^{-1}$) and HCT-116 for human colon carcinoma ($IC_{50}=623.6\;mg\;kg^{-1}$).

고들빼기의 부위별 성분 및 생리활성 차이를 검토하고자 일반성분, 폴리페놀 및 플라보노이드 함량, 항산화성 및 항암성을 분석하였다. 고들빼기 식물체 부위별 조단백질과 조지방은 꽃, 잎, 줄기 뿌리 순으로 높았고 조섬유와 조회분은 줄기와 뿌리가 꽃과 잎보다 높은 것으로 나타났다. 고들빼기의 총 페놀 함량은 꽃($72.9\;mgkg^{-1}$)에서 가장 높게 나타났고, 그 다음은 잎, 줄기, 뿌리 순으로 나타났다. 총 플라보노이드 함량은 잎($23.3\;mgkg^{-1}$), 꽃, 줄기, 뿌리 순으로 나타났다. 고들빼기에서 DPPH(DPPH radical scavenging activity)법에 의한 항산화성은 농도와 비례하게 활성이 증가하는 양상을 합성 항산화제 Vitamin C와 BHT보다 낮은 활성이지만 뿌리, 잎, 꽃, 줄기 순으로 높은 활성을 보였다. MTT assay에 의한 세포독성 시험결과 뿌리 추출물이 폐암(Calu-6) ($IC_{50}=196.3\;mgkg^{-1}$)과 대장암 세포주(HCT-116) ($IC_{50}=623.6\;mgkg^{-1}$)에 대해서 가장 높은 활성을 보였다. 생리활성물질 함량과 그 활성은 고들빼기 부위별로 다르게 나타났으며 총 페놀 함량과 총 플라보노이드 함량은 생리활성과 낮은 연관성을 보였으나 항산화성과 항암활성간에는 높은 상관관계를 보인 것으로 나타났다.

Keywords

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