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摘 要:用HPLC法测定了黄芪甲苷含量.样品从东北黄芪中提取,用色谱纯甲醇溶解并稀释,采用YWG-C18柱,流动相为甲醇,在205
nm下检测,灵敏度为0.1 AUFS,测定了黄芪甲苷的含量.平均回收率为96.1%,RSD为2.15%,结果表明,样品浓度在0.01~0.2
mg/mL之间与峰面积成良好的线性关系. High-performance
Liquid Chromatographic Determination of Tian Feng,Deng Yingjie Abstract:A
sensitive method was developed to determine astragaloside by high-performance
liquid chromatography with the C18 column.The mobile phase was methanol and the UV absorbency
was monitored at 205 nm.This assay demonstrated that astragaloside
had adequate sensitivity and selectivity to measure the concentrations
of astragaloside in Astragalus membranaceus(Fisch.)Bunge. 黄芪为常用中药,素有“补药之长”之称,具有益气固表,利尿托毒等功效.黄芪药用价值很高,临床上常用来治疗非特异性免疫功能低下、乙肝和心血管系统疾病.黄芪甲苷作为黄芪成分之一,其化学结构如图1所示,它具有降压、抗炎、稳定红细胞膜、提高血浆cAMP含量,促进小鼠再生肝DNA合成和增强免疫功能等多种作用〔1〕.因此在研究黄芪过程中,我们对其成分黄芪甲苷进行了含量测定方法研究.已有的测定方法多为薄层扫描法〔2〕和香草醛-硫酸比色法〔3〕,前者操作繁琐,背景干扰多,误差较大;后者空白吸收值高,受时间因素干扰大,均难以准确测定.本文试用HPLC法测定黄芪甲苷的含量.其样品浓度的范围在0.01~0.2 mg.mL之间与峰面积呈线性,该法灵敏度高,重现性好,可准确地测定东北黄芪甲苷的含量. Fig.1 The formulation of astragaloside 1 仪器与方法 仪器:Waters高效液相色谱仪,510型泵,490E紫外检测仪. 2 方法与结果 2.1 色谱条件 Tab.1 The concentration and peak area of the standard sample |
C/(mg.mL-1)×10-1 | Peak area/×106 |
0.1 | 0.483 0 |
0.3 | 0.507 8 |
0.5 | 0.552 1 |
1.0 | 0.633 0 |
2.0 | 0.820 0 |
Tab.2 The results of recovery |
The content of astragaloside | The adding weight | Measuremental | Recovery/% |
0.675 | 0.723 5 | 1.359 | 94.6 |
0.675 | 0.723 5 | 1.369 | 93.5 |
0.675 | 0.723 5 | 1.365 | 96.5 |
0.675 | 0.723 5 | 1.376 | 97.2 |
0.675 | 0.723 5 | 1.392 | 98.7 |
x=96.1%,RSD=2.15% 2.5 稳定性实验 Fig.2 The chromatogram of the sample Fig.3 The chromatogram of control Tab.3 The measuremental results of the sample content |
n | 1 | 2 | 3 | 4 | 5 | Mean |
A(×106) | 0.514 579 | 0.508 208 | 0.501 172 | 0.517 491 | 0.516 960 | 0.511 682 |
n=5,RSD=0.694%,Ai=0.511 682×106,Ci=0.027 mg.mL-1 则50 g药中黄芪甲苷为67.5 mg,相当于每克生药中含黄芪甲苷1.35 mg. 3 讨论 a.本实验考察了黄芪水提取液醇沉除多糖和蛋白质,乙醚除脂类物质,过Al2O3∶MgO滤层除黄酮,最后制得甲醇浸液的工艺,结果表明,此方法提取完全,损失少,分离度良好. 作者单位:田丰(沈阳药科大学药学系,沈阳 110015) 参考文献: [1]余灏,杨胜华.黄芪皂苷分析方法研究近况.华西药学杂志,1993,8(3):163~166 收稿日期:1999-01-16 |