葛根黄豆甙元-PVP分散物的研究

本文采用聚乙烯吡咯烷酮(PVP)为载体,制备了葛根黄豆甙元固体分散物。经差热分析、X-射线衍射、偏光显微镜观察实验证明黄豆甙元-PVP 1∶9固体分散物为固体溶液或共沉淀物,其胶囊在人工胃液中最高累积释放百分量和人工肠液中平衡溶解度均是普通胶囊的8倍左右。     

Simultaneous determination of safflor yellow A, puerarin, daidzein, ginsenosides (Rg(1), Rb(1), Rd), and notoginsenoside R(1) in rat plasma by liquid chromatography-mass spectrometry

A liquid chromatograph/mass spectrometry (LC/MS) method was developed for the simultaneous quantitation of seven compounds (safflor yellow A, puerarin, daidzein, ginsenosides (Rg(1), Rb(1), Rd), and notoginsenoside R(1)) in rat plasma samples with sufficient sensitivity to facilitate analysis of samples collected after an intravenous injection of Naodesheng. The plasma samples were subjected to protein precipitation with acetone, and analyzed using negative atmospheric pressure chemical ionization mass spectrometry in selected ion monitoring (SIM) mode with baicalin as an internal standard. Good linearity for all the seven compounds was observed. The intra- and inter-day precision of analysis was <15.0% for each compound, and the accuracy ranged from 90.0% to 109.0%. This quantitation method was successfully applied to a pharmacokinetic study of following intravenous injection of rats with Naodesheng.     

大豆素与葛根素抑制LPS 诱导RAW264.7细胞NO 产生的活性比较

目的：比较分析大豆素与葛根素体外抗氧化及抑制NO、NOS活性机制。方法：用1滋g·mL-1 LPS诱导体外培养的RAW264.7细胞,制备呼吸爆发、自由基反应模型。采用MTT法检测大豆素及葛根素的细胞毒性;采用DCFH-DA探针及激光共聚焦显微镜观察被试药的抗氧化能力;采用Griess法检测细胞培养体系中NO水平;采用化学比色法测定细胞内T-NOS含量。结果：大豆素与葛根素均能显著抑制LPS诱导RAW264.7细胞NO释放及T-NOS表达。结论：大豆素与葛根素的抗氧自由基活性接近,有望作为葛根素的替代品使用。     

Endocrine disrupting effects in rats perinatally exposed to a dietary relevant mixture of phytoestrogens

Dietary phytoestrogens may prevent certain human diseases, but endocrine activity has been reported in animal studies. Sprague-Dawley rats were exposed perinatally to a 1-, 10- or 100-fold “high human dietary intake” mixture of 12 phytoestrogens consisting of mainly the lignan secoisolarici resinol and the isoflavones genistein and daidzein.This mixture induced persistent adverse effects, as adult male mammary glands showed hypertrophic growth. A reduced anogenital distance in newborn males indicated an anti-androgenic mode of action. Testosterone levels, testis and prostate weights, and expression of selected genes in testis and prostate were unaffected. Decreased serum estradiol was seen in genistein-exposed dams. This study indicated adverse effects at high intake levels in rats, but does not provide evidence for risk of phytoestrogen-mediated endocrine disruption at normal human dietary consumption levels. Further studies are warranted to increase the knowledge upon which risk assessment on dietary phytoestrogen exposure during pregnancy and infancy is based.     

The role of intestinal microflora on daidzein excretion in urine in humans treated with chungpesagantang

This study examined the relationship between the metabolism of the constituents of herbal medicines by human intestinal microflora and the level of metabolites excreted in the urine. This was performed by administering Chungpesagantang (CST) to volunteers and measuring their fecal metabolic activity CST to and urine excretion of daidzein, one of the metabolite of CST The metabolic activity of of CST dadizein was 54.8 +/- 16.7 mmol/h/g wet feces. When CST was administered orally to the subjects, the amount of daidzein excreted in the urine over 24 h was 103.7 +/- 55.8 mg, which accounted for 20.2% of the puerarin, daidzin and daidzein contained in CST. However, neither puerarin nor daidzin were excreted in the urine. The profile of daidzein excreted in the urine was found to be in proportion to that of the metabolic activity of the CST components. This suggests that the daidzein level excreted in the urine of the subjects administered CST is associated with the daidzein glycoside-hydrolyzing activity of the fecal microflora.     

大豆苷元对豚鼠离体胆囊自发性收缩运动的影响

目的：研究大豆苷元对豚鼠离体胆囊自发性收缩运动的影响。方法：采用豚鼠离体胆囊肌条收缩描记法．观察不同浓度的大豆苷元其自发性收缩的影响。结果：大豆苷元显著抑制豚鼠离体胆囊肌条自发性收缩活动,使收缩力降低,紧张性下降。且呈量效反应关系。此外,还可对抗乙酰胆碱、组胺引起的离体胆囊肌条收缩运动。结论：大豆苷元显著抑制豚鼠离体胆囊自发性收缩。     

大豆苷元局部麻醉作用的研究

目的：研究大豆苷元的局部麻醉作用。方法：采用蟾蜍离体坐骨神经动作电位法、豚鼠皮丘法、椎管麻醉法、表面麻醉法。结果：大豆苷元对蟾蜍离体坐骨神经动作电位可完全消失,且动作电位可恢复正常。大豆苷元有浸润麻醉作用,而且盐酸肾上腺素可明显延长大豆苷元的局麻作用时间。家兔椎管内注入大豆苷元也可产生明显的椎管内麻醉作用。大豆苷元对家兔角膜具有一定的表面麻醉作用,其表面麻醉效果较1％的普鲁卡因更弱。结果：大豆苷元有明显的局部麻醉作用。     

大豆苷元对免疫器官的影响

目的：研究大豆苷元对免疫器官的作用。方法：称重法测定小鼠的体重和脾脏、胸腺重量。结果：大豆苷元能显著增加小鼠的体重,及其脾指数和胸腺指数。结论：大豆苷元能增加小鼠的体重和免疫器官的重量。     

金雀黄素和大豆黄酮对人乳腺癌细胞系体外增殖作用的影响

应用体外细胞培养和MTT比色法.研究大豆异黄酮类化合物金雀黄素和大豆黄酮对人乳腺癌细胞系体外增殖作用的影响.结果大豆异黄酮类化合物能明显抑制人乳腺癌细胞系MCF-7 和MDA-MB-231的体外增殖,且呈明显的剂量依赖性和时间依赖性.金雀黄素和大豆黄酮对MDA-MB-231细胞的抑制作用不如MCF-7明显,而金雀黄素的抑制作用优于大豆黄酮.说明金雀黄素和大豆黄酮对乳腺癌细胞系体外增殖具有明显的抑制作用,为进一步阐明其防癌抑癌作用机理奠定了实验基础.     

大豆苷元对人非小细胞肺癌A549、H1299细胞增殖、迁移能力的影响及机制

目的探究大豆苷元(daidzein,Daid)对非小细胞性肺癌细胞株A549和H1299增殖、迁移能力的影响及可能机制。方法以A549和H1299为研究对象,CCK-8法检测Daid(0,5,10,25,50,100,200μmol·L^-1)抑制A549和H1299两种细胞的增殖情况。划痕和Transwell小室实验检测Daid对肺癌细胞迁移和侵袭能力的影响。Western blot检测Cleaved Caspase-3和LC3Ⅱ/Ⅰ等的蛋白表达。结果与对照组相比,Daid在体外可明显抑制肺癌细胞的增殖,且抑制作用呈浓度依赖关系。Daid(100μmol·L^-1)可明显降低人肺癌细胞A549和H1299的迁移侵袭能力。Western blot结果显示,Daid(100μmol·L^-1)预处理后,两种肺癌细胞的Cleaved Caspase-3及LC3Ⅱ/Ⅰ表达升高。结论Daid可抑制人非小细胞肺癌A549和H1299细胞的增殖,使上述细胞的迁移侵袭能力明显下降,其机制可能与Daid诱导细胞凋亡及自噬有关。