Rapid identification of chemical constituents in Yinqiao powder using ultra-high-performance liquid chromatography coupled to quadrupole-time-of-flight tandem mass spectrometry using data filtering strategy.

Yinqiao powder is a classic and effective prescription for the treatment of many kinds of pneumonia in China. To date, its chemical constituents have not been determined. A comprehensive identification of its chemical constituents provided a structural basis to discover the potential anti-pneumonia ingredients in Yinqiao powder. This paper developed an ultra-high-performance liquid chromatography (UHPLC) coupled to quadrupole time-of-flight tandem mass spectrometry (UHPLC-QTOF-MS/MS) analysis with diagnostic product ions and neutral loss filtering strategy and applied it for the comprehensive chemical profiling of Yinqiao powder, which simplified the structural elucidation of chemical constituents in Yinqiao powder. A total of 124 compounds, comprising 8 C6-C2 glucoside conjugates, 28 iridoid glycosides, 14 lignans, 21 phenylethanol glycosides, 20 triterpenoid saponins, 9 chlorogenic acids, and 24 flavonoids, were rapidly identified in Yinqiao powder, and 32 of these were characterized by comparing their MS/MS data and retention time with reference standards. The results indicated that UHPLC-QTOF-MS/MS method coupled with data filtering strategy was feasible and rational to identify the complex chemical constituents of Yinqiao powder, which would be conducive to discover the active ingredients of Yinqiao powder for the treatment of pneumonia and establish its quality standard.