为筛选黄连中α-葡萄糖苷酶抑制剂,本研究采用高效液相色谱.电喷雾质谱联用技术(HPLC—DAD-MS)对黄连提取物中的化学成分进行分析鉴定,并采用高速逆流色谱分离其中的活性成分。选用反相C18色谱柱,以0.02%醋酸溶液(A)和甲醇(B)为流动相,进行梯度洗脱;利用电喷雾质谱(ESI-MS)正离子模式在线检测化学成分;以仪-葡萄糖苷酶作为生物靶分子,以超滤质谱技术筛选酶抑制剂。再经高速逆流色谱分离纯化,以乙酸乙酯-正丁醇-乙醇-水(3.0:1.7:0.5:6.0,v/v/v/v)为两相溶剂系统,所得分离收集液经高效液相色谱法检测。实验通过HPLC.DAD.MS共鉴定出5个化学成分,分别为药根碱、表小檗碱、黄连碱、巴马亭和小檗碱。通过HSCCC分离得到两种α-葡萄糖苷酶抑制剂巴马亭和小檗碱。利用液相色谱-超滤-质谱-高速逆流色谱联用技术可以快速分离鉴定黄连中的化合物。此方法对于筛选有效成分具有快速和灵敏等优势。
The aim of this study was to analyze and identify the chemical compositions from Rh/zoma Coptidis crude extracts by ultrafiltration HPLC-DAD-MS combined with high-speed countercurrent chromatography, and to screen the α- glucosidase inhibitors from R. Coptidis. Chromatographic separation was carried out on a reversed phase Clscolumn and a binary mobile phase system consisting of 0.02% acetic acid aqueous(A) and methanol(B) under a gradient condition; Electrospray ionization mass spectrometry(ESI-MS) with positive ion mode was used to detect the chemical constituents. α-Glucosidase were employed as the targeted enzyme, and the uhrafiltration MS technique was employed to screening the inhibitors ;HSCCC purification with a binary phase system was made up of ethyl acetate/n-butanol/ethanol/water(3.0: 1.7:0.5 : 6.0, v/v/v/v). Finally, five chemical compounds from R. Coptidis including jaterorhizine, epibererine, cop- tisine, palmatine and berberine respectively were separated and detected. Palmatine and berberine were found to have α- glucosidase inhibition effect.