[Application of differential derivative spectrophotometry to the determination of total chlorogenic acid in Lonicera japonica Thunb. and yinqiao jiedu pian].

The total chlorogenic acid in Lonicera japonica and yinqiao jiedu pian was determined by differential derivative spectrophotometry in this paper. Quantitative analysis of this component in eight mixtures of medicinal herbs can be done without any separation. The average recovery of total chlorogenic acid is 100.40 +/- 1.82% (CV). The method features good reproducibility, favorable stability and high sensitivity.