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复方益母草胶囊是由益母草、当归和熟地3味药材经过一定的工序加工制成的复方制剂,该胶囊主要药味益母草中含有生物碱类、黄酮类、二萜类、苷类、脂肪酸类、挥发油类等成分[1]. 生物碱类盐酸水苏碱是益母草的主要药效成分[2]. 盐酸水苏碱是季胺碱,极性强,无共轭结构,紫外吸收弱,属于末端吸收. 高效液相色谱法是盐酸水苏碱目前最为普遍的检测方法,盐酸水苏碱常用的检测器有紫外检测器 (DAD等) [3]、质谱检测器(MS)[4]、示差检测器(RID)和蒸发光散射检测器 (ELSD) [5]等,目前尚未报道电雾式检测器(CAD)被用于盐酸水苏碱的定量分析. 用紫外检测器测定盐酸水苏碱,存在方法重复性差、溶剂末端吸收干扰、梯度洗脱时容易出现基线漂移检测不稳定等局限性[6];依据盐酸水苏碱的结构中有旋光性的特点,采用RID检测器测定其含量,无需特殊样品处理方法就有很好的峰形,但专属性不强、灵敏度较低,且不能使用梯度洗脱分离效果不佳,应用相对较少[7-8];ELSD检测器是目前定量分析盐酸水苏碱最常用的检测器,据报道其灵敏度也较低[9]. 电雾式检测器(CAD)是一种质量相关的通用型检测器,其检测信号不依赖于被测物质的化学结构,更适用于无紫外吸收或只有较弱紫外吸收成分的定量分析.
本研究利用Thermo-fisher AcclaimTM Mixed-Mode WAX-1色谱柱结合HPLC-CAD法分离测定复方益母草胶囊中主要成分盐酸水苏碱含量,探讨该方法对比现行《中国药典》(2020版)一部中ELSD测定盐酸水苏碱的优势,为其质量评价和标准制定提供理论依据,同时为未来推广到其它含益母草类制剂中使用提供科学参考,具有现实应用价值,且目前缺少相关报道.
高效液相色谱-电雾式检测法测定复方益母草胶囊中盐酸水苏碱
Determination of stachydrine hydrochloride in compound leonurus japonicus capsules by high performance liquid chromatography-charged aerosol detector
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摘要: 盐酸水苏碱是复方益母草胶囊的主要质控成分,目前主要使用高效液相色谱-蒸发光散检测法(HPLC-ELSD)测定其含量. 本文采用高效液相色谱-电雾式检测器法(HPLC-CAD),建立定量测定复方益母草胶囊中盐酸水苏碱的新分析方法,快速有效的评价复方益母草胶囊的质量. 对比ELSD和CAD不同检测器的检测限(LOD)和定量限(LOQ),考察市场不同型号色谱柱对复方益母草胶囊中盐酸水苏碱的分离效果,以及提取溶剂对盐酸水苏碱提取效率的影响。结果表明,盐酸水苏碱浓度在9.3—465.0 μg·mL−1范围内具有良好的线性关系,相关系数(r)为0.9995. 方法精密度、重复性和24 h稳定性RSD值均小于2.0%(n=6),盐酸水苏碱加样回收率在95.7%—99.2%范围内,RSD值为1.1%. 5批复方益母草胶囊盐酸水苏碱含量每粒14.94—15.92 mg,均符合《中国药典》(2020版)一部复方益母草胶囊含量要求. 批内一致性PA为6.5%,批间一致性PB为28.9%.
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关键词:
- 高效液相色谱-电雾式检测器 /
- 高效液相色谱-蒸发光散检测器 /
- 益母草 /
- 复方益母草胶囊 /
- 盐酸水苏碱
Abstract: Stachydrine hydrochloride is the main quality control component of compound Leonurus japonicus capsules. Due to its non conjugated structure and weak ultraviolet absorption, the content of stachydrine hydrochloride is mainly determined by high performance liquid chromatography-evaporative light scattering detector(HPLC-ELSD). In this study, a new method for the quantitative determination of stachydrine hydrochloride in compound Leonurus japonicus capsule was established by high performance liquid chromatography-charged aerosol detector(HPLC-CAD), and the quality of compound Leonurus japonicus capsule was evaluated rapidly and effectively. Firstly, the detection limit (LOD) and limit of quantitation (LOQ) of different detectors in ELSD and CAD were compared, and the detector with better sensitivity was selected; Secondly, the separation effect of stachydrine hydrochloride in compound Leonurus japonicus capsules by different types of chromatographic columns in the market was investigated to select the best chromatographic column for subsequent experiments; Thirdly, the influence of extraction solvent on the extraction efficiency of stachydrine hydrochloride was also investigated; Results indicated that the concentration of stachydrine hydrochloride had a linear relationship with the concentration of stachydrine hydrochloride in the range of 9.3—465.0 μg·mL−1, and the correlation coefficient (r) was 0.9995. The RSD values of the precision, 24 h stability and repeatability of the method were less than 2.0% (n=6). The recovery of stachydrine hydrochloride was 95.7%—99.2%, and the RSD value was 1.1%. The content of stachydrine hydrochloride in 5 batches of compound motherwort capsules was 14.94—15.92 mg/capsule, which was in line with the requirements of compound Leonurus japonicus in the Chinese Pharmacopoeia 2020 (VolumI). The intra assay consistency was 6.5%, and the inter assay consistency was 28.9%. -
表 1 盐酸水苏碱回收率(n=2)
Table 1. Recovery rate of stachydrine hydrochloride(n=2)
序号 取样量/g 样品含有量/mg 加标量/mg 测得量/mg 回收率/% 平均回收率/% 相对标准偏差/% 1 0.1042 3.4821 3.3420 6.7972 99.1953 97.37 1.14 2 0.1095 3.5389 3.3420 6.7904 97.2901 3 0.1079 3.6058 3.3420 6.8040 95.6998 4 0.1031 3.4454 3.3420 6.6717 96.5381 5 0.1096 3.6626 3.3420 6.9328 97.8527 6 0.1062 3.5489 3.3420 6.8387 98.4361 7 0.1040 3.4754 3.3420 6.7093 96.7638 8 0.1047 3.4988 3.3420 6.7481 97.2262 -
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