摘要
目的研究蒙古黄芪[Astragalus membranaceus(Fish·)Bge·var·mongholicus(Bge·)Hsiao]中有效成分对超氧阴离子(O2-)的清除能力,并探讨黄酮类物质抗氧化能力与结构之间的关系。方法对蒙古黄芪中的黄酮类成分进行分离,通过化学发光法测定这些成分对邻苯三酚-鲁米诺-碳酸缓冲液(pH10·2)体系产生的超氧阴离子的清除能力。结果从蒙古黄芪中分离出12个黄酮类单体,分别为:槲皮素(Ⅰ),异槲皮苷(Ⅱ),芦丁(Ⅲ),山柰酚(Ⅳ)和异鼠李素(Ⅴ),芒柄花素(Ⅵ),芒柄花苷(Ⅶ),毛蕊异黄酮(Ⅷ),(3R)-8,2′-二羟基-7,4′-二甲氧基异黄烷(Ⅸ),2′,4′-二甲氧基-3′-羟基异黄烷-6-O-β-葡萄糖苷(Ⅹ),(6aR,11aR)-10-羟基-3,9-二甲氧基紫檀烷(Ⅺ),(6aR,11aR)9,10-二甲氧基紫檀烷-3-O-β-D-葡萄糖苷(Ⅻ)。结果表明,所有成分在一定浓度范围内(此浓度范围所对应的清除率在10%~90%之间),量效呈对数关系(y=alogx+b)。构效关系结果显示,化合物的分子结构决定其抗氧化活性。结论黄芪中的黄酮类成分具有明显的清除超氧阴离子活性,是黄芪抗氧化作用的主要活性成分,且黄酮类成分的清除超氧阴离子活性与其结构有明显的相关性。
OBJECTIVE To study the scavenging activities of the flavonoids for superoxide anion radicals from Astragalus membranaceus ( Fish. ) Bge. var. mongholicus ( Bge. ) Hsiao, and to analyze the structure-activity relationship of the compounds. METHODS The flavonoids were isolated from Astragalus membranaceus ( Fish. ) Bge. var. mongholicus ( Bge. ) Hsiao, Their antioxidant activities were compared by scavenging the superoxide anion radicals generated by the Pyrogallic acid 3-Amino-Phthalhy-drazid(Luminol)-Na2CO3/ NaHCO3 buffer( pH 10. 2)system. RESULTS Twelve compounds were isolated from Astragalus membranaceus (Fish.) Bge. var. mong- holicus ( Bge. ) Hsiao , they were quercetin (Ⅰ), isoquercitrin (Ⅱ), rutin (Ⅲ) , kaempferol (Ⅳ), isorhamnetin ( Ⅴ ), formononetin ( Ⅵ ), formononetin-7 -O-β-D-glucoside ( Ⅶ), calycosin (Ⅷ), ( 3R ) 8,2'-dihydroxy-7, 4 '-dimethoxyisoflavan ( Ⅸ ), 2', 4'-dimethoxy-3 '-hydroxy- isoflavan-6-O-β-glucopyranoside( Ⅹ), (6aR, 11aR)3,9-dimethoxy-10-hydroxypterocarpan(Ⅺ) and (6aR, 11aR)9,10-dimethoxypterocar- pan-3-O-β-D-glucoside(Ⅻ). The concentration effect relationships were all logarithmic(y = alogx + b) over the range of 10% - 90% of the scavenging activities. The scavenging activities of the flavonoids for superoxide anion were decided by their structures. CONCLUSION The flavonoids from Astragalus membranaceus (Fish.) Bge. var. mongholicus ( Bge. ) Hsiao have strong scavenging activities of the superoxide anion,and they are the main antioxidants in the herb.
出处
《中国药学杂志》
CAS
CSCD
北大核心
2008年第4期256-259,共4页
Chinese Pharmaceutical Journal
基金
国家自然科学基金资助项目(30472160)
关键词
蒙古黄芪
黄酮
抗氧化
超氧阴离子
Astragalus membranaceus (Fish.) Bge. var. mongholicus (Bge.) Hsiao
flavonoids
antioxidant
superoxide anion