采用高效液相色谱法测定杜仲叶中绿原酸的含量.所用色谱柱为Shim-pack CLC-ODS柱 ,以巯嘌呤为内标,以甲醇-0.01 mol/L磷酸二氢钾缓冲液(体积比为25:75;pH 3.9) 为流动相,UV检测波长为328 nm.在上述色谱条件下,当绿原酸质量浓度为25~300 mg/L时 ,以绿原酸对照品溶液与内标液的峰面积比为纵坐标(Y),绿原酸的质量浓度为横坐标(X),二者呈良好的线性关系,线性方程为Y=8.036 8X+1.275×10-3 ,r=0.999 9;平均回收率为99.89%,RSD=1.45%(n=6).
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