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Evaluation of biological activity for Dangyuja (Citrus grandis) leaves and investigation of optimal concentrations extracted by alternative ethanol concentrations

에탄올 농도별 당유자 잎의 최적추출조건 및 생리활성 평가

  • Nakamura, Masaya (Majors in Plant Resource and Environment, College of Agriculture and Life sciences, SARI, Jeju National University) ;
  • Ra, Jong-Hwan (Majors in Plant Resource and Environment, College of Agriculture and Life sciences, SARI, Jeju National University) ;
  • Kim, Ju-Sung (Majors in Plant Resource and Environment, College of Agriculture and Life sciences, SARI, Jeju National University)
  • 나카무라 마사야 (제주대학교 생명자원과학대학 친환경농업연구소) ;
  • 라종환 (제주대학교 생명자원과학대학 친환경농업연구소) ;
  • 김주성 (제주대학교 생명자원과학대학 친환경농업연구소)
  • Received : 2019.02.01
  • Accepted : 2019.03.20
  • Published : 2019.03.31

Abstract

TheCitrus grandis Osbeck is a special product in the Jeju island. The product has been as a remedy for liver damage and hang over. This study demonstrates how to investigate and compare the antioxidant, phenol content, tyrosinase and ${\alpha}$-glucosidase inhibitory activity, antimicrobial, and alcohol dehydrogenase (ADH) and acetaldehyde dehydrogenase (ALDH) activity with the C. grandis leaves extracted in different ethanol concentrations. From the yield, a 20% ethanol extract demonstrated the highest results among the other extracts. The distilled water extract showed the most abundant in a total phenol content and highest ABTS radical scavenging activity and reducing power assay. In the DPPH radical scavenging activity, ${\alpha}$-glucosidase and tyrosinase inhibitory assay (used ${\text\tiny{L}}$-tyrosine as substrate), the 80% ethanol extract exhibited a higher value than other extracts. The 60% ethanol extract showed prominent activities in the tyrosinase inhibitory (used ${\text\tiny{L}}$-dopa as substrate), ADH and ALDH activity assay. In the minimum inhibitory concentration (MIC) assay, 60% and 80% ethanol extracts inhibited the bacterial growth almost similarly. Moreover, the gram-positive bacteria was more restrained than the gram-negative bacteria. The resultsrevealed that the distilled water and 80% ethanol extract showed a relatively higher antioxidant activity compared to other extracts. The 60 ~ 80% ethanol extracts demonstrated potential tyrosinase, ${\alpha}$-glucosidase inhibitory, antimicrobial, ADH and ALDH activities. Therefore, the C. grandis is suggested to be considered as a functional material for various proposes.

제주도 특산물로 알려진 당유자의 잎을 이용한 연구는 미흡한 실정이며, 특히 용매 농도별로 다양한 생리활성을 측정한 연구는 지금까지 보고되어 있지 않았다. 이에 따라 본 연구에서는 에탄올 농도별로 추출된 당유자 잎에 대한 생리활성을 측정하였다. 수율과 총 페놀 함량은 각각 20% 에탄올, 물 추출물이 가장높은 함량을 가진 것으로 나타났으며 가장 낮은 수율을 보인 100% 에탄올 추출물에서 비교적 높은 페놀 함량이 나타나 수율에 비하여 많은 페놀 함량이 확인되었다. 환원력과 ABTS radical 소거능 실험 결과 물 추출물이 가장 높은 활성을 나타냈으며 80% 에탄올 추출물이 DPPH radical 소거능, ${\alpha}$-glucosidase, ${\text\tiny{L}}$-tyrosine을 기질로 한 tyrosinase 저해 활성에서 가장 우수한 활성을 가진 것으로 나타났다. 또한 ${\text\tiny{L}}$-dopa를 기질로 한 tyrosinase 저해 활성과 지금까지 보고된 바 없는 ADH 및 ALDH 활성에서는 60% 에탄올 추출물이 가장뛰어난 활성을 촉진시켰고 미생물 생육을 억제하는 능력이 60%, 80% 에탄올에서 거의 동일하게 나타났다. 이 결과에서 항산화 효과를 얻고자 할때는 물이나 80% 에탄올로, 그 외 생리활성(${\alpha}$-glucosidase 저해활성, tyrosinase 저해활성, 항미생물 활성, ADH 및 ALDH 활성)에서는 60~80% 에탄올로 추출하는 것이 가장 효과적일 것으로 사료된다. 본 실험의 결과는 당유자 잎을 신소재 개발 원료로서 사용하는데 하나의 기초 자료가 될 것으로 기대된다.

Keywords

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