Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Antioxidant and anti-diabetic effects of Ixeris strigosa extract

선씀바귀 추출물의 항산화 및 항당뇨 효과

  • Ji, Yun-Jeong (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Lee, Eun Young (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Lee, Ji Yeon (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Seo, Kyung Hye (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Kim, Dong Hwi (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Park, Chun Geon (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science) ;
  • Kim, Hyung Don (Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science)
  • Received : 2020.04.14
  • Accepted : 2020.05.18
  • Published : 2020.06.30
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Abstract

Purpose: Ixeris strigosa (IS) is a perennial plant that commonly grows in meadows. The leaves and roots of IS have been used in medicine as a sedative. This study evaluated the antioxidant and carbohydrate-digestive-enzyme inhibitory effects of IS to determine its potential as an essential antioxidant and glycemic inhibitor for type 2 diabetics. Methods: The antioxidative and α-amylase and α-glucosidase inhibitory activities were examined using the water extracts (ISW), ethanol extracts (ISE), and solvent fractions from IS. The antioxidative activities were measured using in vitro methods by measuring the 1,1-diphenyl-2-picrylhydrazyl and 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid radical scavenging activity. Results: Investigations of the total polyphenol, flavonoid content, in vitro antioxidant activity, and α-amylase and α-glucosidase inhibitory activities of the IS extract showed that the ISE had higher total phenolic and flavonoid contents than the ISW, as well as high antioxidant activity. The ethanolic extracts of IS (70%) had an α-amylase inhibitory activity of 78.55%. The ethyl acetate fraction (90.56%) showed higher α-glucosidase inhibitory activity than the positive control, acarbose (83.01%). Conclusion: Among the ISE fractions, the ethyl acetate and butanol fractions showed the best digestive enzyme inhibitory activity. Moreover, the antioxidant activity of the extract and the carbohydrate, α-amylase, and α-glucosidase inhibitory effects showed a stronger correlation with the total phenol and flavonoid contents compared to the ISW. As a result, the antioxidant and digestive enzyme inhibitory activities of high ISE are due to the phenolic compounds, particularly the flavonoid compounds. Therefore, ethyl acetate and butanol fractions of the 70% ethanol extract are excellent anti-diabetic functional materials.

본 연구는 선씀바귀의 항산화 및 탄수화물 소화효소 억제 효과를 평가하여 제 2형 당뇨환자에게 중요한 항산화제 및 혈당 상승 억제제로서의 가능성을 타진하고자 하였다. 선씀바귀 추출물의 총 폴리페놀, 플라보노이드 함량과 in vitro 항산화 활성 및 소화효소 저해 활성을 조사한 결과 ISE가 ISW보다 총페놀과 플라보노이드 함량이 높았고 항산화 활성 및 소화효소 저해 활성 또한 높았다. ISE의 계통분획물 중에 에틸아세테이트 분획물과 부탄올 분획물의 소화효소 저해 활성이 가장 우수하고, 추출물의 항산화활성과 탄수화물 소화효소 억제효과가 총 페놀 및 플라보노이드함량과 높은 상관성을 가지는 것으로 볼 때, ISW에 비해 상대적으로 높은 ISE의 항산화 및 소화효소 저해 활성은 페놀 화합물, 특히 플라보노이드 화합물 때문임을 알 수 있었다. 따라서 ISE와 에틸아세테이트 그리고 부탄올 분획물은 우수한 항당뇨 기능성 소재라고 판단된다.

Keywords

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