한국식품영양과학회지 (Journal of the Korean Society of Food Science and Nutrition)

  • 제44권12호
  • /
  • Pages.1912-1917
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  • 2015
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  • 1226-3311(pISSN)
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  • 2288-5978(eISSN)
한국식품영양과학회 (The Korean Society of Food Science and Nutrition)
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카페인산의 효소적 산화반응으로부터 췌장 지방분해효소 저해 물질의 분리

Secondary Metabolites from Enzymatic Oxidation of Caffeic Acid with Pancreatic Lipase Inhibitory Activity

  • 김태훈 (대구대학교 식품공학과) ;
  • 김명권 (대구대학교 물리치료학과)
  • Kim, Tae Hoon (Department of Food Science and Biotechnology, Daegu University) ;
  • Kim, Myoung Kwon (Department of Physical Therapy, Daegu University)
  • 투고 : 2015.09.01
  • 심사 : 2015.10.08
  • 발행 : 2015.12.31
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초록

천연식물에 광범위하게 존재하는 대표적인 페닐프로파노이드 화합물인 caffeic acid에 대해 배 유래의 polyphenol oxidase로 산화반응을 수행하여 상대적으로 높은 pancreatic lipase 저해 활성($IC_{50}$; $161.2{\pm}2.8{\mu}g/mL$)을 확인하였으며, 이는 caffeic acid와 비교하였을 경우 활성이 상승함을 알 수 있었다. Caffeic acid 산화반응물에 대해서 $C_{18}$ 겔을 활용한 column chromatography를 수행하여 4종의 리그난 화합물을 분리하였고, 각 화합물의 화학구조는 NMR 스펙트럼 데이터 해석 및 표품과의 HPLC 직접 비교를 통하여 phellinsin A(2), caffeicinic acid(3), isocaffeicinic acid(4), 7,8-erythro-caffeicin(5)으로 동정하였다. 이들 화합물중 phellinsin A(2)는 $IC_{50}$ 값이 $66.3{\pm}2.6{\mu}M$로 가장 강한 효능을 나타내었으며, 다음으로 caffeic acid 2분자의 산화 결합을 통해 생합성된 caffeicinic acid(3)의 $IC_{50}$ 값이 $109.6{\pm}3.7{\mu}M$의 저해능을 나타내었다. 배에 존재하는 polyphenol 산화효소에 의해 생합성된 caffeic acid 이량체가 pancreatic lipase 저해 활성 물질임을 확인하였으며, 이들 활성은 caffeic acid가 결합 양상에 따른 화합물의 구조에 따라 다름이 시사되었다. 향후 이들 활성물질의 활성 기작에 대한 연구가 필요하며 본 연구 결과는 보다 우수한 pancreatic lipase 저해능을 가지는 새로운 선도화합물 발굴을 위한 기초자료로 이용될 수 있을 뿐만 아니라 항비만 물질의 상업화를 위한 기초자료로 이용될 수 있을 것으로 사료된다.

Pancreatic lipase is a potential therapeutic target for the treatment of diet-induced obesity in humans. As part of our continuing search for novel bioactive compounds, the convenient enzymatic transformation of caffeic acid into neolignans as well as related oxidized-products enhanced pancreatic lipase inhibitory activity. Enzymatic transformation of caffeic acid (1) using polyphenol oxidase originating from Korean pear yielded four oxidized metabolites, which were identified by different spectroscopic techniques ($^1H$,$^{13}C$ NMR, DEP/T, $^1H-^1H$ COSY, HMBC, HMQC, and NOESY). The anti-obesity efficacy of caffeic acid reactant was tested by in vitro porcine pancreatic lipase assay. All tested samples showed dose-dependent pancreatic lipase inhibitory activities. Four oxidative products including phellinsin A (2), caffeicinic acid (3), isocaffeicinic acid (4), and 7,8-erythro-caffeicin (5) were isolated and identified. The major metabolites (2~5) were evaluated for their pancreatic lipase inhibitory activity, and oxidized-products (2~3) improved potency against pancreatic lipase when compared to original caffeic acid. This result suggested that the neolignans isolated from oxidative transformation of caffeic acid might be beneficial in the treatment of obesity and relevant diseases, and the convenient enzymatic transformation by polyphenol oxidase may be a valuable method for structural modification and enhancement of activity.

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