HPLC法测定白石清热冲剂中葛根素的含量
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.
, 百拇医药
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
, http://www.100md.com
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.
, 百拇医药
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.
, 百拇医药
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
, http://www.100md.com
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
, 百拇医药
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
, 百拇医药
no
Puerain in
sample/mg
Added/mg
Found/mg
Recovery/%
Mean
Recovery/%
RSD/%
1
1.011 4
0.580
, http://www.100md.com
1.537 3
96.6
—
—
2
1.021 3
0.580
1.566 1
97.8
—
—
3
1.003 1
, 百拇医药
0.580
1.571 9
99.3
97.2
1.7
4
1.008 0
0.580
1.507 2
94.9
—
—
5
, http://www.100md.com
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
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.
, 百拇医药
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
, http://www.100md.com
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.
, 百拇医药
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.
, 百拇医药
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
, http://www.100md.com
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
, 百拇医药
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
, 百拇医药
no
Puerain in
sample/mg
Added/mg
Found/mg
Recovery/%
Mean
Recovery/%
RSD/%
1
1.011 4
0.580
, http://www.100md.com
1.537 3
96.6
—
—
2
1.021 3
0.580
1.566 1
97.8
—
—
3
1.003 1
, 百拇医药
0.580
1.571 9
99.3
97.2
1.7
4
1.008 0
0.580
1.507 2
94.9
—
—
5
, http://www.100md.com
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