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余冠中 《中国医药工业杂志》2002,33(5):217-218
对棕榈氯霉素结晶工艺进行了摸索研究,确定了由生理无效型A晶型转化为生理有效型B晶型工艺的最佳条件,获得了符合中国药典1995年,BP93版标准的产品。 相似文献
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抗生素结晶工艺优化方法 总被引:7,自引:0,他引:7
从4个方面综合论述了目前抗生素结晶工艺优化研究中采用的方法:(1)抗生素结晶溶剂的选择;(2)抗生素结晶体系介稳区测定:(3)晶体的制备;(4)抗生素结晶过程过饱和度的控制。 相似文献
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通过实验研究各操作参数对普鲁卡因青霉素结晶产品粒度的影响,来考察混合对普鲁卡因青霉素溶液微粒结晶过程的影响,从而得到了最佳结晶工艺,并应用于工业生产中。 相似文献
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目的 了解MBT矫治技术之托槽多用性对上颌侧切牙腭向错位的矫治效果。方法 选择15例安氏Ⅰ类或Ⅲ类伴上颌侧切牙腭向错位患者,运用MBT技术之托槽多用性原理进行矫治并观察其治疗结果。结果 15例患者经过矫治后腭向错位的牙齿均回复到正常牙弓的位置,且冠根控制良好,无需进行弓丝弯制,从而节省了椅旁操作时间,提升了整个矫治的效率。结论 MBT矫治技术之托槽多用性对上颌侧切牙腭向错位有很好的矫治效果。 相似文献
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The aim of this study was to gain information on the effects of the crystal form of corticosteroids on the topical anti-inflammatory activity. Two different crystal forms, Form A and Form B, of the drugs of prednicarbate, hydrocortisone, betamethasone 17-valerate, prednisolone, and methyl prednisolone were prepared and their topical anti-inflammatory activities were measured using arachidonic acid induced ear edema assay in mice. Two crystal forms of the drugs showed differences in anti-inflammatory activity. Among the drugs examined, Form B of prednicarbate and betamethasone 17-valerate showed significantly more potent anti-inflammatory activities as compared to their Form A. 相似文献
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不同盐酸青藤碱晶形在家兔体内相对生物利用度的研究 总被引:3,自引:2,他引:3
目的:比较不同盐酸青藤碱晶形在家兔体内相对生物利用度.方法:家兔灌胃给药30mg/kg体重.采用反相高效液相色谱法测定家兔的血药浓度,色谱柱为ODS C18柱(150mm×4.6mm,5μm),流动相为乙腈-0.01 mol/L KH2PO4(55:45)检测波长为263 nm.结果:盐酸青藤碱纯白色、淡黄色、浅灰色3种晶形的AUC0-12h,分别为(693.3±120.5),(494.4±101.6),(481.9±98.5)ng·h/mL,其相对生物利用度分别为97.5%,75.4%,73.5%.结论:纯白色盐酸青藤碱为最佳晶形,供该原料药制剂生产提供参考. 相似文献
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Nojavan S Ghassempour A Bashour Y Darbandi MK Ahmadi SH 《Journal of pharmaceutical and biomedical analysis》2005,36(5):983-988
In the present work, the relationship between residual solvents concentration and ampicillin trihydrate crystals stability has been investigated. The amounts of residual solvents determined by GC, X-ray powder diffraction (XRPD) and Fourier transform infrared spectroscopy (FT-IR) were used for characterization of solid state. The obtained results have shown good relationship between concentration of methylene chloride (as a critical residue solvent) and degree of ampicillin trihydrate crystallinity. As with the increasing methylene chloride concentration in the sample the degree of crystallinity decreased after stability test. From this relationship, critical concentration of methylene chloride into the ampicillin trihydrate is obtained and the results can be used for improving the large-scale production of ampicillin trihydrate. 相似文献
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介绍了农村专业技术协会的组建原则与方法、民主管理制度、利润分配制度及其产权结构安排,并从决策机制、激励机制、积累与发展机制、约束机制等方面介绍协会的运行机制,探讨其存在的主要问题,并提出进一步发展的政策建议 相似文献
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本文应用误差叠加原理,对药物分析中的内标定量法进行了评价。五个实际例子说明,内标法改善分析方法精密度的条件是CV;s<2rCV,i。作者提出了在药物分析中所用内标法的条件。本文表明内标法除了其优点外,还存在一些局限性。 相似文献