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Anti-inflammatory effects of ethyl acetate fraction of unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo-Bansi) on lipopolysaccharide-stimulated RAW 264.7 cells

지방질다당류로 자극한 RAW 264.7 세포에서 청도반시 땡감 에틸 아세테이트 분획물의 항염증 효과

  • Park, Ye Bin (Department of Food Science and Biotechnology, Kyung Hee University) ;
  • Jeong, Ha-Ram (Department of Food Science and Biotechnology, Kyung Hee University) ;
  • Lee, Seung Hwan (Department of Food Science and Biotechnology, Andong National University) ;
  • Kim, Taewan (Department of Food Science and Biotechnology, Andong National University) ;
  • Kim, Dae-Ok (Department of Food Science and Biotechnology, Kyung Hee University)
  • 박예빈 (경희대학교 식품생명공학과) ;
  • 정하람 (경희대학교 식품생명공학과) ;
  • 이승환 (안동대학교 식품생명공학과) ;
  • 김태완 (안동대학교 식품생명공학과) ;
  • 김대옥 (경희대학교 식품생명공학과)
  • Received : 2018.12.28
  • Accepted : 2019.02.02
  • Published : 2019.02.28

Abstract

Unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo-Bansi) is a by-product produced when thinning out the superfluous fruit of persimmon. We investigated whether unripe astringent persimmon has antioxidative and anti-inflammatory effects. Unripe astringent persimmon extract was fractionated sequentially in n-hexane, chloroform, ethyl acetate, n-butanol, and water. The ethyl acetate fraction had the highest total phenolic content, total flavonoid content, and antioxidant capacity compared to those of the other fractions. Pretreatment of lipopolysaccharide-stimulated RAW 264.7 macrophages with the ethyl acetate fraction reduced nitric oxide, interleukin-6, and intracellular oxidative stress in a dose-dependent manner. Ultra-high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry analysis revealed gallic acid, protocatechuic acid, 4-hydroxybenzoic acid, quercetin-3-O-glucoside, quercetin, and p-coumaric acid as the phenolic compounds of the ethyl acetate fraction. Collectively, these findings suggest that unripe astringent persimmon is a source of functional materials that can promote antioxidative and anti-inflammatory effects.

본 연구에서는 적과한 청도반시 땡감을 40% (v/v) 에탄올-물 혼합 용액으로 추출하고, 이 추출물을 액체-액체 추출법으로 5개 분획물(노말-헥세인, 클로로폼, 에틸 아세테이트, 노말-뷰탄올, 물)을 얻었다. 5개 분획물 중에서 에틸 아세테이트 분획물이 총 페놀 함량, 총 플라보노이드 함량 및 산화방지능이 가장 높았다. 에틸 아세테이트 분획물은 지방질다당류로 자극한 RAW 264.7 세포에서 산화 질소, IL-6, 산화 스트레스를 감소시켰다. UPLC-ESI-MS/MS를 이용하여 땡감 에틸 아세테이트 분획물에서 페놀 화합물로 갈산, 프로토카테츄산, 4-하이드록시벤조산, 쿼서틴-3-O-글루코사이드, 파라-쿠마르산, 쿼서틴을 동정하였다. 본 연구를 통해서 적과 과정에서 부산물로 버려지는 청도반시 땡감이 산화방지능 및 항염증 효과를 보유한 기능성 소재로서 활용될 가능성을 제시하였다. 그러나 향후 적과한 청도반시 땡감의 산화방지능에 기반한 항염증 효과를 좀 더 명확하게 밝히기 위해서는 청도반시 땡감에 존재하는 개별 생리활성물질의 정량 분석 및 항염증에 대한 분자생물학적 메커니즘을 규명할 필요가 있다.

Keywords

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Fig. 1. Inhibitory effects of the ethyl acetate fraction from unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo- Bansi) on nitrite production in lipopolysaccharide (LPS)- stimulated RAW 264.7 cells.

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Fig. 2. Inhibitory effects of the ethyl acetate fraction from unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo- Bansi) on inflammatory cytokine interleukin 6 (IL-6) production in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells.

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Fig. 3. Effects of the ethyl acetate fraction from unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo- Bansi) on intracellular oxidative stress in RAW 264.7 cells against oxidative stress induced with AAPH using the DCFHDA assay.

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Fig. 4. UPLC-ESI-MS/MS chromatogram of the ethyl acetate fraction from unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo-Bansi).

Table 1. Total phenolic and flavonoid contents, and antioxidant capacities of five fractions of unripe astringent persimmon (Diospyros kaki Thunb. cv. Cheongdo-Bansi)

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Table 2. Identification of phenolic compounds in the ethyl acetate fraction of unripe astringent persimmon (Diospyros kaki Thunb. cv.Cheongdo-Bansi) using UPLC-ESI-MS/MS

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