HPLC测定三拗汤不同煎液中甘草酸的含量及体外抗菌作用比较

目的：考察用合煎、分煎方法制备的三拗汤汤剂中甘草酸含量的变化,比较体外抗菌作用。方法：建立高效液相色谱方法,采用Agilent Zorbax SB C₁₈色谱柱(4.6 mm×250 mm,5 μm),以乙腈-0.2%乙酸(35∶65)为流动相,流速1 mL·min^-1,检测波长254 nm,分析三拗汤合煎液和分煎液样品中甘草酸的含量。采用稀释法体外测试三拗汤不同煎液对常见菌种的最低抑菌浓度(MIC)和最低杀菌浓度(MBC)。结果：三拗汤合煎液中甘草酸的平均含量大于分煎液中甘草酸的平均含量。三拗汤合煎液对绿脓杆菌有抑菌作用,而分煎液没有;合煎液对金黄色葡萄球菌的抑菌作用略大于分煎液。结论：与分煎液比较,合煎液中甘草酸的含量较高,抑菌作用较强。

Determination of glycyrrhizic acid in different decoctions of Sanaotang by HPLC and comparison with antifugal effects in vitro

OBJECTIVE: To investigate the contents of glycyrrhizic acid in hejian decoction (mixed the traditional Chinese herbs together, then boiling them with water) and the fenjian decoction (boiling the single traditional Chinese herb with water separately, then mixed the abstracts) of Sanaotang (composed of Ephedra sinica, Prunus armeniaca and Glycyrrhiza uralensis) and to compare with their anti-bacterial activities in vitro. METHOD: A HPLC method was established with a Agilent Zorbax SB-C18 column (4. 6 mm x 250 mm, 5 microm), a mobile phase of acetonitrile-0.2% acetic acid solution (35:65), a flow rate of 1 mL x min(-1) and a detection wavelength of 254 nmn in order to determine the contents of glycyrrhizic acid minimal bacterial inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) antagonized the common bacteria in different decoctions were rieasured in vitro by employing dilution method. RESULT: The average content of glycyrrhizic acid of the hejian decoction was higher than that of the fenjian decoction. The hejian decoction could display the inhibitory bactericidal activity to Aeruginosus bacillus, but the fenjian decoction could not. And to Staphylococcus aureus, the inhibitory bactericidal activity the hejian decoction was slightly stronger than that of the fenjian decoction. CONCLUSION: Comparing with that of the fenjian decoction, the content of glycyrrhizic acid of the hejian decoction was higher and the anti-bacterial activities was stronger.