Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Lipase Inhibitory Mode of Dieckol Isolated from Eisenia bicyclis Ethanol Extract

Eisenia bicyclis 에탄올 추출물로부터 분리한 Dieckol의 Lipase 저해 Mode

  • Jung, Seul-A (Department of Food Science and Technology / Institute of Food Science, Pukyong National University) ;
  • Kim, Koth-Bong-Woo-Ri (Institute of Fisheries Sciences, Pukyong National University) ;
  • Kim, Dong-Hyun (Department of Food Science and Technology / Institute of Food Science, Pukyong National University) ;
  • Cho, Ji-Young (Department of marine biotechnology, Soonchunhyang University) ;
  • Kim, Tae-Wan (Department of Food Science and Biotechnology, Andong National University) ;
  • Ahn, Dong-Hyun (Department of Food Science and Technology / Institute of Food Science, Pukyong National University)
  • 정슬아 (부경대학교 식품공학과/식품연구소) ;
  • 김꽃봉우리 (부경대학교 수산과학 연구소) ;
  • 김동현 (부경대학교 식품공학과/식품연구소) ;
  • 조지영 (순천향대학교 해양생명공학과) ;
  • 김태완 (안동대학교 식품생명공학과) ;
  • 안동현 (부경대학교 식품공학과/식품연구소)
  • Received : 2012.10.11
  • Accepted : 2012.12.01
  • Published : 2013.03.28
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Abstract

This study was performed to investigate the possible use of Eisenia bicyclis (EB) ethanol extract to inhibit activity against lipase. In tests, the lipase inhibitory activity of EB ethanol extract was noted as being 43, 27, and 24% at concentrations of 5, 2.5, and 1 mg/ml, respectively. Isolation was carried out by liquid and liquid extraction, silica-gel column chromatography, and HPLC. The results showed that the lipase inhibitory activity of the ethyl acetate (EA) fraction from EB ethanol extract exhibited the strongest lipase inhibitory activity with an $IC_{50}$ value of 1.31 mg/ml. The EA fraction was separated using silica-gel column chromatography and we obtained 22 sub-fractions. Amongst them, the EA1 fraction showed the highest lipase inhibitory activity with an $IC_{50}$ value of 0.54 mg/ml. Eight peaks were obtained from the EA1 fraction by HPLC. Fraction 5 also showed a strong lipase inhibitory activity with an $IC_{50}$ value of 0.37 mg/ml. The fraction 5 was identified as dieckol and the inhibition pattern analyzed from Lineweaver-Burk plots revealed a non-competitive inhibitor. These results suggest that EB has potential as a natural anti-obesity agent.

대황 ethyl acetate 분획은 $IC_{50}$ 값이 1.31 mg/ml으로 에탄올 추출물보다 높은 lipase 저해활성을 나타내었다. Silicagel column chromatography를 이용하여 ethyl acetate 분획으로부터 얻은 sub-fraction 중 EA1 fraction이 $IC_{50}$ 값 0.54 mg/ml로 가장 높은 저해활성을 보였으며 더 나아가 HPLC를 이용하여 8개의 sub-fraction으로 분리하였다. HPLC fraction 중 fraction 5가 $IC_{50}$ 값 0.37 mg/ml로 높은 lipase 저해활성을 보였다. 이 fraction 5는 분자량 741.1로 $C_{36}H_{22}O_{18}$ 화합물인 phlorotannin derivative dieckol로 확인되었으며 lipase에 대해 비경쟁적 저해타입을 나타내었다. 이상의 결과로, 대황 에탄올 추출물로부터 분리한 dieckol의 lipase 저해 활성 및 저해 타입 확인을 통해 식품 산업에 항비만 소재로서 응용할 수 있을 것으로 사료되어진다.

Keywords

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