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目的 采用高效液相-质谱联用-自体内标法(HPLC-MS-AIS)测定钩藤中四种主要的吲哚类生物碱(钩藤碱、异钩藤碱、去氢钩藤碱、异去氢钩藤碱)含量。方法 采用C18色谱柱(3.0 mm×50 mm,3.3 μm);0.1%甲酸水溶液∶乙腈=82∶18为流动相;流速0.5 mL/min;柱温30℃。质谱条件:电喷雾离子源;正离子多反应监测模式;毛细管电压为4 000 v;选择质子数/电荷数(m/z):385.25/160.10(钩藤碱)、385.30/160.10(异钩藤碱)、383.25/160.15(去氢钩藤碱)、383.25/160.15(异去氢钩藤碱)作为检测离子对;进样量2 μL。结果 钩藤碱、异钩藤碱、去氢钩藤碱、异去氢钩藤碱线性范围分别为2.30~600.00 ng/mL(r=0.999 3)、2.30~600.00 ng/mL(r=0.999 2)、2.47~650.00 ng/mL(r=0.999 4)、2.47~650.00 ng/mL(r=0.999 2),精密度和稳定性的相对标准偏差(RSD)均<5.00%,准确度为92.40%~104.10%,加样回收率为95.90%~104.60%。结论 采用HPLC-MS-AIS法测定钩藤中四种生物碱含量简便准确,可作为钩藤药材质量控制的新方法。  相似文献   
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目的 建立二维高效液相色谱法(2D-HPLC)同时检测钩藤碱、异钩藤碱、去氢钩藤碱、异去氢钩藤碱四种钩藤生物碱含量的方法。方法 采用Aston SC2(3.5 mm×25 mm,5 μm)一维色谱柱,Aston SH C18(3.5 mm×10 mm,5 μm)中间色谱柱,Aston SCB(4.6 mm×125 mm,5 μm)分析色谱柱,一维流动相为CAA-1,分析流动相为BPI-1∶MPI-1∶OPI=45∶14∶41,流速1.0 mL/min,柱温40℃,检测波长254 nm,进样量500 μL,分析时间9.5 min。结果 钩藤碱、异钩藤碱、去氢钩藤碱、异去氢钩藤碱线性范围分别为9.77~10 000.00 ng/mL(r=0.999 6)、10.74~11 000.00 ng/mL(r=0.999 7)、10.74~11 000.00 ng/mL(r=0.999 7)、10.74~11 000.00 ng/mL(r=0.999 6),精密度、稳定性和重复性相对标准偏差(RSD)<5.00%,准确度为95.20%~104.01%,方法回收率为93.63%~101.38%。结论 建立的2D-HPLC同时检测钩藤中四种生物碱含量的方法简单准确,可作为钩藤药材质量控制的新方法。  相似文献   
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Isorhynchophylline is a major oxindole alkaloid found in Uncaria species which have long been used in traditional Chinese medicine. Here, we investigated the effects of isorhynchophylline and isorhynchophylline-related alkaloids on 5-hydroxytryptamine (5-HT) receptor-mediated behavioural responses in mice and 5-HT-evoked current responses in Xenopus oocytes expressing 5-HT2A or 5-HT2C receptors. Isorhynchophylline dose-dependently inhibited 5-HT2A receptor-mediated head-twitch but not 5-HT1A receptor-mediated head-weaving responses evoked by 5-methoxy-N,N-dimethyltryptamine. Pretreatment with reserpine, a monoamine-depleting agent, enhanced the head-twitching, but did not influence the effect of isorhynchophylline on the behavioural response. Isocorynoxeine, an isorhynchophylline-related alkaloid in which the configuration of the oxindole moiety is the same as in isorhynchophylline, also reduced the head-twitch response in reserpinized mice over the same dose range as isorhynchophylline, while both rhynchophylline and corynoxeine, stereoisomers of isorhynchophylline and isocorynoxeine, did not. None of the alkaloids tested had an effect on meta-chlorophenylpiperazine-induced hypolocomotion, a 5-HT2C receptor-mediated behavioural response. In experiments in vitro, isorhynchophylline and isocorynoxeine dose-dependently and competitively inhibited 5-HT-evoked currents in Xenopus oocytes expressing 5-HT2A receptors, but had less of a suppressive effect on those in oocytes expressing 5-HT2C receptors. These results indicate that isorhynchophylline and isocorynoxeine preferentially suppress 5-HT2A receptor function in the brain probably via a competitive antagonism at 5-HT2A receptor sites and that the configuration of the oxindole moiety of isorhynchophylline is essential for their antagonistic activity at the 5-HT2A receptor.  相似文献   
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