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HPLC法测定丹&#21

 
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lin91957
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PostPosted: Fri 19:55, 18 Mar 2011    Post subject: HPLC法测定丹&#21

HPLC法测定丹参通脉口服液中原儿茶醛的含量
=9).Conclusion:Themethodissimple,rapid,accurateandreproducible.KEYWORDSCyproheptadinehydrochloride;Cyproheptadinehydrochloridetablets;Determination《中国药典>>2005年版二部【1采用紫外分光光度法测定盐酸赛庚啶片的含量.该法受溶剂以及仪器等因素影响较大,笔者参考相关的文献采用高效液相色谱法测定其含量,结果满意。1仪器与试药Aglient1100高效液相色谱仪(在线脱气机、四元泵、自动进样器、柱温箱、可变波长检测器、HPCHEM工作站);XS205Du电子天平(梅特勒.特多利仪器有限公司),PB-20酸度计(赛多利斯仪器有限公司),UV2450紫外.可见分光光度计(日本岛津仪器有限公司),乙腈和庚烷磺酸钠为色谱纯,水为超纯水,其余试剂为分析纯;盐酸赛庚啶对照品(批号:100502—200401,中国药品生物制品检定所),盐酸赛庚啶片为市售品(批号070503,02070901和0801001)。2方法与结果2.1色谱条件色谱柱为KromasilCI8(250mm×4.6mm,5m);流动相为乙腈一0.01tool·L的庚烷磺酸钠溶液(用冰醋酸调节pH至3.0)(70:30);流速1.Oml·min~,进样量:2Ol,检测波长240nm,柱温:30~C。样品溶剂为乙腈一水(50:50)溶液。在选定的色谱条件下,盐酸赛庚啶的保留时间为3.2min,理论塔板数大于10000,峰宽小,峰对称性好。见图1。2.2对照品储备液的制备精密称取于IO0~C减压干燥5h的盐酸赛庚啶对照品适量,加乙腈.水(50:50)溶液制成401.201xg·ml的溶液。2.3供试品溶液和阴性样品溶液的制备取样片20片,精密称定,研细,精密称取适量(约相当于含盐酸赛庚啶2mg)置于lOOml的量瓶中,加乙腈-水(5O:作者简介:张玲雅,女,副主任药师,从事药品检验工作。rrel:(0595)22119785E-mail:815545701@qq.tom!!!!!!!!!!!!!!!!!!!、!;!;;石也石蜗宕蠕;3讨论3.1因原儿茶醛为丹参中的水溶性成分,其又易溶于乙醚,本试验首先用酸酸化使原儿茶醛游离出来,再用乙醚提取,故得到较纯的样品溶液,避免其它组分的干扰。3.2本试验在酸化时曾选择稀硫酸0.3ml和0.5ml酸化,但加0.5ml稀硫酸时样品里有许多粘稠物质析出,导致提取的重复性较差,故选择0.3ml稀硫酸酸化;用乙醚提取时曾提取4、5、6次,结果第5次提取液中还有少量的原儿茶醛,第6次提取液无原儿茶醛,故选择提取次数为5次。3.3流动相的选择:曾参照文献选择流动相为甲醇一水一7冰醋酸(11:89:1)、甲醇.10g·L冰醋酸(20:80),峰形均拖尾。后经过摸索,流动相调整为甲醇一水一冰醋酸(15:84.5:0.5)峰形对称性良好。
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