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Antioxidant activity and neuroprotective effects of ethanol extracts from the core of Diospyros kaki

감 심지 에탄올 추출물의 항산화 활성 및 신경세포 보호 효과

  • Byun, Eui-Baek (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Kim, Min-Jin (Department of Food Science and Technology, Kongju National University) ;
  • Kim, Soon-Jung (Department of Food Science and Technology, Kongju National University) ;
  • Oh, Nam-Soon (Department of Food Science and Technology, Kongju National University) ;
  • Park, Sang-Hyun (Department of Food Science and Technology, Kongju National University) ;
  • Kim, Woo Sik (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Song, Ha-Yeon (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Han, JeongMoo (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Kim, Kwangwook (Department of Food Science and Technology, Kongju National University) ;
  • Byun, Eui-Hong (Department of Food Science and Technology, Kongju National University)
  • Received : 2019.09.03
  • Accepted : 2019.10.21
  • Published : 2020.02.29

Abstract

This study examined the antioxidant activity and neuroprotective effects of ethanol extracts obtained from Diospyros kaki core (DCE). The total polyphenol and flavonoid contents in DCE was 786.47±15.27 and 31.14±0.82 mg/g, respectively. In addition, DCE exhibited a dose-dependent induction of radical scavenging activity, determined by 1,1-diphenyl-picrylhydrazyl (DPPH), 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonicacid) (ABTS), ferric reducing antioxidant power (FRAP), and reducing power assays. The viability of HT22 hippocampal cells was examined to investigate the neuroprotective effect of DCE. DCE treatment did not induce cytotoxicity at concentrations below 1,000 ㎍/mL. Additionally, DCE treatment in the background of H2O2 induce oxidative stress revealed a significant increase in the survival rat, indicated by increased SOD activity and decreased levels of MDA, a lipid peroxidation product. Therefore, the results suggest that DCE can be used as a source of natural antioxidants source and a therapeutic agent for the treatment of brain disorders induced by oxidative stress and neuronal damage.

본 연구는 DCE의 항산화 활성 및 신경세포 보호 효과에 평가하였다. 감 심지로부터 유용성 성분을 얻기 위하여 에탄올 추출을 한 결과 약 10.36±1.34%의 추출물의 수율을 얻을 수 있었다. DCE의 총 폴리페놀, 총 폴라보노이드 함량과 항산화 활성으로 DPPH, ABTS 라디칼 소거능 및 환원력을 평가한 결과, DCE의 항산화 활성이 농도 의존적으로 증가하는 것으로 나타났다. 또한, DCE의 HT22 세포 보호 효과에 관하여 알아보기 위하여 HT22 세포에 DCE을 처리한 후 H2O2를 통한 산화적인 스트레스의 유도를 통하여 세포독성에 미치는 영향을 확인한 결과, DCE의 처리는 HT22 세포에 독성이 나타나지 않았으며, 이에 따라 항산화 효소인 SOD 활성이 증가와 지질과산화 생성물인 MDA level의 감소를 확인 할 수 있었다. 이러한 결과들로 볼 때, DCE의 항산화 및 산화적 스트레스로부터 신경세포 보호효과를 확인함으로서 향후 퇴행성 신경질환 예방에 유용한 건강기능성 식품 소재로서의 개발 가능성이 높을 것으로 판단된다.

Keywords

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