A reliable and accurate HPLC/UV method was developed for the quantitative determination of astragaloside IV in ＇Huang-Qi-Si-Wu＇ Capsules, a widely used prescription of traditional Chinese medicines （TCM）. The chromatographic separation conditions employed for HPLC/UV were optimized using a Hypersil-ODS column （250 mm^4.6 mm, 5.0 pm） with isocratic elution. Acetonitrile-water （32：68, v/v） were used as the mobile phase pumped at a flow rate of 1.0 mL/min and a detection wavelength at 203 nm was used. The method was fully validated with respect to linearity, precision, accuracy, specificity and robustness. The validated method was applied successfully to the quantification of astragaloside IV in the extract of ＇Huang-Qi- Si-Wu＇ Capsules from different production batches. The results indicate that the established HPLC/UV method is suitable for the quantitative analysis and quality control of ＇Huang-Qi-Si-Wu＇ Capsules and other related botanical drugs.
Traditional Chinese medicines （TCMs） have a long history of clinical testing and reliable therapeutic efficacy. They have attracted international attention as excellent sources of bioactive compounds for the discovery of new drugs. However, TCMs usually contain hundreds or even thousands of components and only a few of these compounds are responsible for the pharmacological effects. The large number of components in TCMs makes the analysis and screening for bioactive compounds extremely difficult. Therefore, strategies for analysis and screening of bioactive compounds in TCMs have long been a focus of studies on TCMs. Cell membrane chromatography （CMC） has become a useful tool for studying the bioactive compounds of TCMs. This review summarizes the principles, characteristics, and application of CMC, and the possible problems faced when working with TCMs. This method will likely become increasingly important for screening and analysis of hioactive compounds in TCMs.
