LAUSR

Detection and determination of many known/unknown compounds in traditional Chinese medicines have always been challenging. To comprehensively identify compounds in Qishen granule, which is a widely prescribed herbal formula for treating chronic heart failure, a pseudotargeted screening method was proposed based on compound biosynthetic correlation using ultra high-performance liquid chromatography coupled with high-resolution mass spectrometry. Firstly, all possible compounds of Qishen granule were classified into 9 types according to their core skeletons, and potential analogue molecular formulas were predicted according to core compound-related biosynthetic correlations, such as methylation, hydroxylation, and glucosidation. Secondly, 9 pseudocompound databases consisting of core compounds, deduced biosynthetic correlations, and predicted analogue molecular formulas were established. Then compounds of interest were directly located by pseudotargeted screening of high resolution MS data and further verified by target MS/MS. As a result, 213 constituents were identified and 21 of them were determined as potential new compounds. This demonstrated that pseudotargeted screening based on compound biosynthetic correlations significantly facilitated the processing of extremely large information data and improved the efficiency of compound identification. This research provided essential data for exploration of effective substances in Qishen granule and enriched the methodology for comprehensive characterization of constituents in complex traditional Chinese medicines. This article is protected by copyright. All rights reserved.