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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Characterization of Anti-Advanced Glycation End Products (AGEs) and Radical Scavenging Constituents from Ainsliaea acerifolia

단풍취의 최종당화산물 생성 저해 및 라디칼 소거 물질의 동정

  • Jeong, Gyeng Han (Department of Food Science and Biotechnology, Daegu University) ;
  • Kim, Tae Hoon (Department of Food Science and Biotechnology, Daegu University)
  • 정경한 (대구대학교 식품공학과) ;
  • 김태훈 (대구대학교 식품공학과)
  • Received : 2017.03.09
  • Accepted : 2017.04.25
  • Published : 2017.06.30
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Abstract

Reactive oxygen species (ROS) and advanced glycation end products (AGEs) are valuable therapeutic targets for the regulation of diabetic complications. Activity-guided isolation of the ethylacetate (EtOAc)-soluble portion of 70% ethanolic extract from aerial parts of Ainsliaea acerifolia was performed, followed by AGE formation inhibition assay for the characterization of four dicaffeoylquinic acid derivatives of a previously known structure, methyl 3,5-di-O-caffeoyl-epi-quinate (1), 3,5-di-O-caffeoyl-epi-quinic acid (2), 4,5-di-O-caffeoyl-quinic acid (3), and methyl 4,5-di-O-caffeoyl-quinate (4). The structures of these compounds were confirmed by interpretation of nuclear magnetic resonance (NMR, $^1H-$, $^{13}C-NMR$, two-dimensional NMR) and mass spectroscopic data. Among the isolates, the major secondary metabolites, 3,5-di-O-caffeoyl-epi-quinic acid (2) and 4,5-di-O-caffeoyl-quinic acid (3) showed the most potent inhibitory effects against AGE formation with $IC_{50}$ values of $0.6{\pm}0.1{\mu}M$ and $0.4{\pm}0.1{\mu}M$, respectively. Furthermore, all isolated dicaffeoylquinic acid derivatives were evaluated for their radical scavenging activities using 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical, and compound 3 exhibited the most potent inhibitory effect in a concentration-dependent manner. This result suggests that the caffeoylquinic acid dimers isolated from A. acerifolia might be beneficial for the prevention of diabetic complications and related diseases.

당뇨합병증에 효과적인 천연물 유래의 신소재를 개발하기 위하여 본 연구를 수행하여 단풍취 70% 에탄올 추출물의 EtOAc 가용부로부터 최종당화산물 생성 억제능($IC_{50}=5.5{\pm}1.1{\mu}g/mL$)을 확인하였다. 활성을 나타내는 성분의 동정을 위하여 $C_{18}$겔 등을 활용한 칼럼크로마토그래피를 수행하여 4종의 dicaffeoylquinic acid 유도체 화합물을 분리하였고, 각 화합물의 화학구조는 NMR 스펙트럼 데이터 해석 및 표품과의 HPLC 직접 비교를 통하여 methyl 3,5-di-O-caffeoyl-epi-quinate(1), 3,5-di-O-caffeoyl-epi-quinic acid(2), 4,5-di-O-caffeoyl-quinic acid(3) 및 methyl 4,5-di-O-caffeoyl-quinate(4)로 동정하였다. 이들 화합물에 대해 최종당화산물 생성 억제능을 평가한 결과 4,5-di-O-caffeoyl-quinic acid(3)가 가장 강한 $0.4{\pm}0.1{\mu}M$의 $IC_{50}$ 값을 나타내었으며, 3,5-di-O-caffeoyl-epi-quinic acid(2)가 $0.6{\pm}0.1{\mu}M$의 $IC_{50}$ 값을 나타내었다. 또한, 이들 물질에 대해 $ABTS^+$ 소거 활성을 평가하여 4,5-di-O-caffeoyl-quinic acid(3)가 가장 강한 라디칼 소거 활성인 $14.6{\pm}0.4{\mu}M$의 $IC_{50}$ 값을 나타내었으며, 구조 이성질체인 3,5-di-O-caffeoyl-epi-quinic acid(2)가 $18.8{\pm}0.4{\mu}M$의 $IC_{50}$ 값을 확인하였다. 단풍취에서 분리한 화합물의 활성은 caffeic acid의 결합방식 및 methyl화 여부에 따른 화합물의 구조에 따라 다름이 시사되었다. 향후 우수한 활성을 나타낸 이들 화합물의 in vivo 실험을 통한 활성기작의 검증이 필요하다고 생각된다. 또한, 추가적인 연구를 통하여 식의약 소재로 활용이 가능한 새로운 천연신소재 발굴을 위한 기초자료제공 및 당뇨합병증에 효과적인 천연 물질의 상업화를 위한 귀중한 자료로 활용할 수 있으리라 판단된다.

Keywords

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