Determination of nine components in Reduning Injection by quantitative analysis of multi-components with a single-marker Quantitative method for simultaneous assay of four coumarins with one marker in Fraxini cortex Simultaneous determination of six components in water extract and alcohol precipitation liquid in Astragali Radix by HPLC-UV-ELSD Determination of eight components in Qibai Pingfei Granule by quantitative analysis of multi-components with a single-marker A quantitative method for simultaneous assay of five ingredients with one marker in Salvia miltiorrhiza