Journal of agriculture & life science (농업생명과학연구)

Institute of Agriculture & Life Science, Gyeongsang National University (경상대학교 농업생명과학연구원)
권호 표지

Antioxidant and Neuronal Cell Protective Effect of Purple Sweet Potato Extract

자색고구마 추출물의 항산화 효과 및 신경세포 보호효과

  • Kwak, Ji-Hyun (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Choi, Gwi-Nam (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Park, Ju-Hee (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Kim, Ji-Hye (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Jeong, Hee-Rok (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Jeong, Chang-Ho (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.) ;
  • Heo, Ho-Jin (Dept. of Food Sci. & Biotech.(Insti. of Agric. and Life Sci.), Gyeongsang National Unive.)
  • 곽지현 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 최귀남 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 박주희 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 김지혜 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 정희록 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 정창호 (경상대학교 식품공학과(농업생명과학연구원)) ;
  • 허호진 (경상대학교 식품공학과(농업생명과학연구원))
  • Received : 2010.03.15
  • Accepted : 2010.04.20
  • Published : 2010.04.30
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Abstract

The antioxidant and neuronal cell protective effects of water extract from purple sweet potato were investigated. The total phenolics and monomeric anthocyanin contents of purple sweet potato extract were 44.25 mg/g and 2,394 mg/L, respectively. The antioxidant activities of purple sweet potato extract were evaluated using various antioxidant tests, including 1,1-diphenyl- 2-picrylhydrazyl (DPPH), 2,2'-azino- bis-(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging activities, ferric reducing/antioxidant power (FRAP) and reducing power. In these assays, the extract of purple sweet potato presented significant radical scavenging activities, FRAP, and reducing power in a dose-dependent manner. MTT {3-(4,5-dimethylthiazol-2-yl)- 2,5-diphenyl- tetrazoliumbromide} reduction assay showed significantly increase in cell viability when PC12 cells were pretreated with purple sweet potato extract. Because oxidative stress is also known to increase neuronal cell membrane breakdown, we further investigated by lactate dehydrogenase (LDH) and neutral red uptake assay. Purple sweet potato extract inhibited oxidative stress-induced membrane damage in neuronal cells. Therefore, these data results demonstrated that water extract of purple sweet potato have antioxidant activity and neuronal cell protective effect thus it has great potential as a natural source for human health.

자색고구마 추출물의 항산화 효과와 산화적 스트레스로 유도된 PC12 신경세포에 대한 보호효과에 대하여 연구하였다. 자색고구마 추출물의 총 페놀함량은 44.25 mg/g, monomeric anthocyanin 함량은 2,394 mg/L로 나타났다. 자색고구마 추출물의 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azino-bis-(3-ethylben-zthiazoline-6-sulfonic acid) (ABTS) radical 소거활성, ferric reducing/antioxidant power (FRAP) 및 환원력은 농도 의존적으로 항산화 활성이 증가하였다. MTT {3-(4,5-dimethylthiazol-2-yl)- 2,5-diphenyl-tetrazoliumbromide} reduction assay를 이용하여 자색고구마 추출물의 신경세포 보호효과를 측정한 결과, 세포 생존율이 두드러지게 증가하는 것으로 나타났다. 산화적 스트레스는 신경세포막 손상 정도를 증가시키기 때문에 lactate dehydrogenase (LDH) release assay와 neutral red uptake assay를 이용하여 세포막 손상 보호효과를 조사한 결과 자색고구마 추출물 처리구는 대조구에 비하여 산화적 스트레스로 유도된 세포막 손상 보호효과가 농도 의존적으로 나타났다. 따라서 자색고구마 추출물은 천연 항산화 소재 및 알츠하이머성 치매와 같은 신경퇴행성 질환의 예방 소재로서의 활용 가능성이 기대된다.

Keywords

Acknowledgement

Supported by : 학술진흥재단

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