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HPLC法测定白石清热冲剂中葛根素的含量
http://www.100md.com 《沈阳药科大学学报》 1999年第3期
     作者:刘东春 殷军 邓世新 赵余庆

    单位:沈阳药科大学中药系, 沈阳 110015;邓世新 赵余庆;沈阳飞龙保健品有限公司, 沈阳 110023

    关键词:白石清热冲剂;葛根素;高效液相离子对色谱法

    沈阳药科大学学报990316 摘 要 用反相高效液相离子对色谱法测定白石清热冲剂中葛根素的含量.色谱柱:spherisorb C18(10 μm,4.6 mm×250 mm);流动相:甲醇-pH 6.8,0.01 mol/L 磷酸盐缓冲液(27:73),每升流动相含四丁基溴化铵0.005 mol;检测波长250 mm,测得线性范围0.116~0.580 μg(r=0.999 8),平均回收率97.2%,相对标准差RSD=1.8%.

    分类号 R914
, 百拇医药
    Determination of the Content of Puerain in Baishiqingre-granule

    Liu Dongchun,Yin Jun,Deng Shixin,Zhao Yuqing

    Department of Traditional Chinese Medicines,Shenyang Pharmaceutical University,Shenyang 110015

    Abstract A method was developed for the determination of the content of puerain in Baishiquingre-granule by high performance liquid ion-pair chromatography with a 4.6 mm×250 mm column packed with 10 μm Spherisorb C18 as the stationary phase,a mixtrue of methanol-pH 6.8,0.01 mol/L phosphate salts buffer(27∶73) as the mobile phase which contained tetrabutyl ammonium bromide(TBAB).The concentration of TBAB was 0.005 mol/L.250 nm detection wavelength was selected.The method had a good linearity,a range of 0.116 μg~0.580 μg,and a correlation coefficient r=0.999 8.The mean recovery of puerain was 97.2% with relative standard deviation of 1.8%.The results showed that this method was simple,sensitive,precise and accurate enough to be used in the quality control of baishiqingre-granule.
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    Key words Baishiqingre-granule;puerain;high performance liquid ion-pair chromatography

    白石清热冲剂由葛根,白茅根,白花蛇舌草,生石膏,红花等11种中药组成,临床用于外感风热,咳嗽痰黄,上呼吸道感染,效果良好.本文报道了反相高效液相离子对色谱法测定制剂中的葛根素含量,这种方法测定中药制剂中葛根素的含量国内尚未见报道.

    1 仪器与材料

    高效液相色谱仪:岛津LC-10A;检测器:岛津SPD-10A;数据处理仪:岛津CR-6A.葛根素对照品(中国药品生物制品检定所);甲醇(色谱纯),重蒸馏水,四丁基溴化铵(分析纯,上海青浦新产品研究所);白石清热冲剂(沈阳飞龙保健品有限公司);其它试剂均为分析纯.

    2 方法与结果
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    2.1 色谱条件

    流动相:甲醇-pH6.8,0.01 mol/L磷酸盐缓冲剂(27∶73),每升流动相加入四丁溴化铵0.005 mol;流速:1.0 mol/min;色谱柱:spherisorbC18:10 μm,4.6 mm×250 mm;检测波长:250 mm.

    2.2 线性考查

    精密称取葛根素对照品适量,加甲醇制成0.05 mg/mL的溶液,作为对照品溶液.分别吸取葛根素对照品溶液(0.058 mg/mL)2.0,4.0,6.0,8.0,10.0 mL依次进样,按上述色谱条件分析,以葛根素进样量(μg)为横座标,色谱峰面积为纵座标绘制标准曲线,结果表明葛根素进样量0.116~0.580 μg,可得良好的线性关系.直线回归方程为:Y=2.851 471×106X—0.004 597×106(r=0.9998),结果见表1.
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    2.3 含量测定

    本品研细,精密称定10g,置250 mL锥形瓶.加氯仿20 mL超声震荡15 min,放冷,滤过.待滤渣中残留氯仿挥尽之后,将药渣放回锥形瓶中,加乙醇20 mL超声震荡15 min,抽滤.再将药渣转移至锥形瓶,加15 mL乙醇,超声震荡8 min抽滤,同前,再取15 mL乙醇超声震荡8 min,抽滤.合并滤液,滤液置水浴上蒸干,残留物加甲醇适量溶解,定量转移至25 mL量瓶中,并用甲醇稀释至刻度,摇匀,作为供试样品溶液.

    精密称定缺葛根空白对照品细粉10 g,同前操作,制得空白对照品溶液,注入色谱仪6 μL空白对照品溶液,记录色谱图(见图3).从色谱图可见,杂质峰不干扰葛根素峰面积的测定.

    测定方法:参照中国药典1995版一部附录VID高效液相色谱法测定.分别精密吸取对照品溶液、样品溶液各6 μL,测定葛根素峰面积(见图1与图2),计算即得.
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    Tab.1 The linerity of detector response No

    1

    2

    3

    4

    5

    X-Amount of puerain/μg

    0.116

    0.232

    0.348

    0.464

    0.580
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    Y-Peak area/×106

    0.329 308

    0.660 275

    0.984 779

    1.301 826

    1.662 386

    Fig.1 Reference standard

    a—Puerain

    Fig.2 Sample
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    Fig.3 Sample which was absence of Radix Puerariae

    2.4 稳定性实验

    精密称取样品10 g,按“3.2”项含量测定方法制备供试液.在第0,1,2,3,4,5 h注入同一供试液6 μL,分别测定葛根素峰面积,测定结果为:0.706 852×106,RSD=1.4%(n=6).

    2.5 回收率实验

    精密称取已知准确含量样品10 g,精密加入对照品溶液10 ml,使甲醇挥尽后.按样品含量测定项下方法操作,测定结果:平均回收率=97.2%,RSD=1.7%(n=5),结果见图2.

    Tab.2 The recovery of puerain Sample
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    no

    Puerain in

    sample/mg

    Added/mg

    Found/mg

    Recovery/%

    Mean

    Recovery/%

    RSD/%

    1

    1.011 4

    0.580
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    1.537 3

    96.6

    —

    —

    2

    1.021 3

    0.580

    1.566 1

    97.8

    —

    —

    3

    1.003 1
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    0.580

    1.571 9

    99.3

    97.2

    1.7

    4

    1.008 0

    0.580

    1.507 2

    94.9

    —

    —

    5
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    1.033 5

    0.580

    1.568 3

    97.2

    —

    —

    3 讨论

    a.葛根素(puerarin)为黄酮苷类,pH值对其溶解度影响较大〔1〕,所以采用含有缓冲盐的流动相以得到稳定的色谱峰,加入四丁基溴化铵以提高柱效,经实验验证方法可行,达到预期目的.

    b.有文献报道以甲醇-水(20∶80)为流动相,对某种中药制剂中葛根素含量进行测定,在40℃可得适宜的葛根素分离图谱〔2〕.而在室温时,若单纯采用上述流动相则柱效过低,对于没有炉箱的高效液相色谱仪来说上述方法不适用.本文所述反相高效液相离子对色谱法在室温时就可简便、快速、准确地测量,且重现性良好.

    参考文献

    1 王成,刘土玲,谷士杰.葛根素的溶解性及其结合助溶的研究.中国药学杂志,1993,28(5):294~296

    2 张伟,粟晓黎,田今改.高效液相色谱法测定鼻炎胶囊中葛根素的含量.药物分析杂志,1994,14(4):43~44

    收稿日期:1999-01-25, 百拇医药