METHODS Use a BDS-C18 column with linear gradient elution of sodium acetate buffer (pH 4.5) - methanol (80:20) and methanol at the flow rate of 1.0mL/min. The detection wavelength was 271nm.

• 方法采用BDS-C18柱；以醋酸-醋酸钠缓冲液(pH4.；5)-甲醇(80:20)为流动相A；甲醇为流动相B进行程序梯度洗脱；检测波长271nm；流速1