From the total methanolic extract of Gardenia jasminoides (Rubiaceae), various antioxidative characteristics were identified in terms of nitrite scavenging ability, 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical cation inhibition, superoxide dismutase (SOD)-like activity, and elongation effect of lipid peroxidation using Rancimat. After successive partitioning with n-hexane, chloroform, n-butanol, and water, potent nitrite scavenging abilities were shown in the n-butanol fraction and water fraction, and IC50 values were 183 ppm and 194 ppm, respectively. As for ABTS radical cation inhibition, the chloroform fraction was most potent and its IC50 was 159 ppm. SOD-like activity was slightly low in all of the fractions. The elongation effect of lipid peroxidation also increased dose-dependently and the antioxidative index (AI) of the total methanolic extract was 2.93 in 1000 ppm, which was more effective than 1.66 of butylated hydroxy anisol in the same concentration. The compounds I and II were isolated through silica gel column chromatography of the active fractions, and identified as geniposide and crocin, respectively, by 1H-NMR spectral data. The IC50 values for the nitrite scavenging abilities of geniposide and crocin were 940 ppm and 77 ppm, respectively. In ABTS radical cation inhibition, the IC50 values of geniposide and crocin were 684 ppm and 549 ppm, respectively. And the EC50 value for SOD-like activity of crocin was 259 ppm, which was much smaller than 453 ppm by the positive control, chlorogenic acid. The EC50 value of geniposide could not be identified.
목차
Abstract 서론 재료 및 방법 재료 시약 및 기기 치자의 추출 및 분획 Nitrite 소거작용 측정 ABTS radical cation 저해작용 측정 SOD 유사활성 측정 유지산화 지연효과 측정 Compound I과 compound II의 분리 Compound I의 구조 확인 Compound II의 구조 확인 통계처리 결과 및 고찰 치자 fraction의 Nitrite 소거작용 치자 fraction의 ABTS radical cation 저해작용 측정 치자 fraction의 SOD 유사활성 활성 Rancimat을 이용한 유지산화 지연효과 측정 Compound I과 II의 Nitrite 소거작용 Compound I과 II의 ABTS radical cation 저해작용 측정 Compound I과 II의 SOD 유사활성 요약 문헌
키워드
Gardenia jasminoidesgeniposidecrocinantioxidant activitiesantioxidative index