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微量量热法研究黄连中小檗碱类生物碱对金黄色葡萄球菌生长代谢的影响 总被引:2,自引:0,他引:2
采用微量量热法研究中药黄连中具有抑菌作用的3种小檗碱类生物碱成分对金黄色葡萄球菌生长代谢的影响.在不同给药条件下,以表达功率.时间曲线(热谱曲线)的特征参数生长速率常数k、半数抑菌浓度(IC50)、最大输出功率(Pmax)及达峰时间(tp)和总产热量(Qt)为指标,对3种小檗碱类生物碱成分抑制金黄色葡萄球菌生长代谢程度进行客观地量化评价.结果表明,k、Pmax和Qt均随3种小檗碱类生物碱成分浓度的增加而相应的减小;tp随3种小檗碱类生物碱成分浓度的增加而相应的延长;其IC50分别为小檗碱101.4μg/mL、巴马汀241.0μg/mL和药根碱792.3μg/mL,即抑菌活性大小顺序为小檗碱〉巴马汀〉药根碱.初步构效关系研究提示,位于苯环的C2、C3上的亚甲二氧基或甲氧基较羟基更有助于提高其抑菌活性. 相似文献
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ZHAO Yu WANG Gang LI Yong-qiang WANG Su-hua LI Zheng-ming 《高等学校化学研究》2010,(3):380-383
Ten new N-oxalyl derivatives of neonicotinoid compound were designed and synthesized. Their structures were confirmed by 1H NMR spectra, elemental analysis and X-ray diffraction. The preliminary insecticidal activities of the new compounds were evaluated. The results of bioassays indicate that the title compounds exhibit moderate insecticidal activities. Surprisingly, the insecticidal activity of compound 7b against bean aphids at 200 mg/kg is 100%, which is comparable to that of the commercialized imidacloprid. 相似文献
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A new free recoverable and reusable mono-alkaloid-type ligand has been synthesized by a simple method.With highly polar groups,the ligand can be recycled and reused eight times to prepare ethyl(2R,3S)-2,3-dihydroxy-3-phenylpropionate with high yield and ee via asymmetric dihydroxylation(AD) reaction. 相似文献
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建立了同时测定川贝枇杷糖浆中6种有效成分(桔梗皂苷D、贝母辛、齐墩果酸、西贝素、贝母甲素和贝母乙素)含量的微流蒸发光散射检测器(μELSD)与加压毛细管电色谱(p CEC)联用检测方法。搭建p CEC-μELSD联用平台,采用C18毛细管色谱柱(EP-150-15-3-C18),流动相为乙腈(A)-10 mmol·L-1甲酸-三乙胺水溶液(p H 11.0)(B),梯度洗脱,柱流速为1.02μL·min-1,施加电压为+10 k V,雾化载气流速为0.4 L·min-1,蒸发温度为40℃。川贝枇杷糖浆中6种有效成分可在10 min内得到分离检测,6种有效成分的线性范围可达4个数量级,检出限均在pg水平,加标回收率为97.9%~103.0%。所建立的p CEC-μELSD联用方法精密度、重复性和稳定性良好,且简便、快速、可靠,可用于川贝枇杷糖浆中6种有效成分的含量测定。 相似文献
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