共查询到20条相似文献,搜索用时 140 毫秒
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采用抗癌药筛选新方法-MTT法,研究了6种从中草药马先蒿(Pedicularis)中分离提取的苯丙素甙化合物(phenylpropanoidglycosides,PPG)对3种不同组织癌细胞生长的抑制活性。结果表明:6种PPG的抗肿瘤活性强度与其化学结构密切相关;它们的抑癌活性强度顺序为:isoverbascoside,verbascoside,echinacoside,pediculariosideA>cistanosideD>permethylverbascoside;即分子中酚羟基越多,抗肿瘤活性愈强,当酚羟基完全被甲基化后,则对癌细胞生长无抑制作用。 相似文献
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从何首乌Polygonum multiflorum块根中分离得到二苯乙烯甙,经理化性质和波谱数据分析为2,3,5,4'-四羟基二苯乙烯-2-O-β-D-葡萄糖甙(2,3,5,4'-terahydroxystilbene-2-O-β-D-glucoside),是首乌有效成分。又以此化合物为对照品,测定首乌制剂中二苯乙烯甙的含量。 相似文献
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棘莓果鞣质类化学成分研究 总被引:3,自引:1,他引:3
从棘莓果中分得10个化合物,经理化常数测定和光谱分析鉴定为木麻黄素、1,2,3,6-四氧-没食子酰-β-D-葡萄糖(1,2,3,6-tetra-O-galloyl-β-D-glucose,Ⅲ)、1,2,3,4,6-五氧-没食子酰-β-D-葡萄糖(1,2,3,4,6-penta-O-galloyl-β-D-glucose,Ⅲ)、龙芽草素、金樱子素D、金樱子素F、棘莓果素M1、刺莓果素D1、刺莓果素D 相似文献
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目的建立同时测定旱柳叶中木樨草素-7-O-葡萄糖苷、水杨苷、芹菜素-3’-氧乙基-7-O-葡萄糖苷及杨梅酮含量的高效液相色谱(HPLC)方法。方法 Nucleosil C18(4.6 mm×250 mm,5μm)色谱柱,以乙腈-水(5∶95)-(30∶70)为梯度流动相;流速为1.0 ml.min-1;检测波长为246 nm;柱温为25℃。结果木樨草素-7-O-葡萄糖苷在0.02~0.1 mg范围内与峰面积呈良好线性关系,R=0.999 0,平均回收率为97.81%,RSD为2.93%;水杨苷在0.03~0.15 mg范围内与峰面积呈良好线性关系,R=0.998 8,平均回收率为97.54%,RSD为1.62%;芹菜素-3’-氧乙基-7-O-葡萄糖苷在0.008~0.04 mg范围内与峰面积呈良好线性关系,R=0.999 1,平均回收率为97.41%,RSD为1.37%;杨梅酮在0.04~0.2 mg范围内与峰面积呈良好线性关系,R=0.9977,平均回收率为97.91%,RSD为1.03%。结论此法简便快速,结果准确可靠、重复性好,可用于药材中木樨草素-7-O-葡萄糖苷、水杨苷、芹菜素-3’-氧乙基-7-O-葡萄糖苷及杨梅酮含量的同时测定。 相似文献
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The ethanol extract of a biannual medicinal herb, Youngia japonica (commonly known as Oriental hawk's beard) was reported previously to have potent antiviral activity against respiratory syncytial virus (RSV) cultured in HEp-2 cells. Three anti-microbial agents, namely 3,4-dicaffeoylquinic acid, 3,5-dicaffeoylquinic acid, and luteolin-7-O-glucoside were subsequently purified and chemically characterized from the ethanol extract of Youngia japonica. The two dicaffeoylquinic acids exhibited prominent anti-RSV with 50% inhibitory concentration (IC50) of 0.5 microg/ml in vitro. Luteolin-7-O-glucoside together with the two dicaffeoylquinic acids were also manifested to have some antibacterial activity towards the causal agents of food-borne disease, namely Vibrio cholerae and Vibrio parahaemolyticus at the concentration of 2mg/ml. Bacillus cereus was sensitive to 3,4-dicaffeoylquinic acid and 3,5-dicaffeoylquinic acid only, but not to luteolin-7-O-glucoside. 相似文献
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Antihyperlipidemic effect of flavonoids from Prunus davidiana 总被引:2,自引:0,他引:2
Blood lipid levels in rats with hyperlipidemia resulting from high-fat feeding were determined after ip administration of an MeOH extract of Prunus davidiana stems and its flavonoid components, (+)-catechin, prunin (= naringenin 7-O-glucoside), and hesperetin 5-O-glucoside. Administration of the MeOH extract for 3 days produced a significant decrease of blood triglyceride and total cholesterol, and the atherogenic index was also improved. (+)-Catechin was shown to be effective in reducing the elevated level of triglyceride. Prunin and hesperetin 5-O-glucoside did not show such an effect in high-fat-fed hypertriglyceridemic rats, but they did exhibit a significant hypocholesterolemic effect. 相似文献
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Iranshahi M Shaki F Mashlab A Porzel A Wessjohann LA 《Journal of natural products》2007,70(8):1240-1243
Three new sesquiterpene derivatives, kopetdaghins A-C (1-3), one known prenylated coumarin (7), and two known steroid glucosides, sitosterol 3-O-glucoside and stigmasterol 3-O-glucoside, were isolated from the aerial parts of Dorema kopetdaghense. In addition, two new sesquiterpene derivatives, kopetdaghin D (4) and kopetdaghin E (5), together with kopetdaghins A-C and one known sesquiterpene coumarin (6), were isolated from the roots of the plant. The structures of these compounds were elucidated by various 1D and 2D NMR techniques as well as high-resolution positive-ion ESIMS. 相似文献
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目的:建立红花地上部分中木犀草苷和木犀草素的含量测定方法。方法:采用HPLC法,色谱柱为Hanbanhedera ODS-2C18柱(5μm,4.6×250mm),流动相为甲醇-0.4%冰醋酸梯度洗脱,检测波长为350nm,柱温30℃。结果:木犀草苷回归方程:Y=59558771X-1755,r=0.999991,在0.0019mg/mL~0.1238mg/mL范围内有良好的线性关系,平均回收率为98.04%,RSD=1.68%(n=9);木犀草素回归方程:Y=76381285X-9981,r=0.999995,在0.0020mg/mL~0.1266mg/mL范围内有良好的线性关系,平均回收率为96.56%,RSD=2.00%(n=9)。结论:该方法简便、快捷、准确、重复性好,可用于木犀草苷和木犀草素的含量测定。 相似文献
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茅膏菜化学成分的研究 总被引:2,自引:0,他引:2
采用各种色谱技术对茅膏菜的化学成分进行了研究,从乙醇提取物的乙酸乙酯和水部位分离得到11个化合物,并利用理化常数和波谱数据分别鉴定为:异柿萘醇酮-4-O-β-D-葡萄糖苷(1)、异柿萘醇酮(2)、表异柿萘醇酮(3)、矶松素(4)、茅膏醌(5)、茅膏醌-5-O-葡萄糖苷(6)、槲皮素(7)、山柰酚(8)、棉花皮素-8-O-葡萄糖苷(9)、3,3’-二甲氧基鞣花酸(10)、鞣花酸(11)。其中,化合物1为新化合物,化合物3,8,10,11为首次从该植物中分离得到。 相似文献
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Jayaprakasam B Damu AG Rao KV Gunasekar D Blond A Bodo B 《Journal of natural products》2000,63(4):507-508
7-O-Methyltetrahydroochnaflavone (1), a new biflavanone, together with nine known flavonoids, afrormosin (2), 2,3-dihydroochnaflavone 7-O-methyl ether (3), kaempferol (4), 2,3-dihydroochnaflavone (5), ochnaflavone (6), (-)-epicatechin (7), kaempferol 3-O-rhamnoside (8), taxifolin 3-O-rhamnoside (9), and kaempferol 3-O-glucoside (10), were isolated from the leaves of Ochna beddomei, and the structures were elucidated by spectral and chemical studies. 相似文献