Comprehensive quality control of Qingjin Yiqi granule based on UHPLC‐Q‐Orbitrap‐MS and UPLC‐QQQ‐MS

Abstract Introduction Qingjin Yiqi granule (QYG) is a prescription medicine of traditional Chinese medicine which is widely used clinically for the recovery of coronavirus patients. However, there is currently limited research on the quality control of QYG. Objective To evaluate the quality of QYG qualitatively and quantitatively by making full use of advanced chromatography–mass spectrometry techniques. Methods Firstly, a multicomponent characterisation of QYG was performed by ultrahigh‐performance liquid chromatography coupled with a Q Exactive™ hybrid quadrupole‐Orbitrap mass spectrometry (UHPLC‐Q‐Orbitrap‐MS) system using a rapid negative/positive switching mode. Secondly, the co‐condition fingerprint analysis of constituted herbal medicines of QYG was performed to unveil active ingredients as the quality markers of QYG. Thirdly, the marker compounds in 10 batches of QYG were quantified by ultrahigh‐performance liquid chromatography coupled with a Waters Xevo TQ‐S triple quadrupole mass spectrometry (UPLC‐QQQ‐MS) system. Results A comprehensive method that combined the inclusion list and data‐dependent acquisition (DDA) to achieve a systematic characterisation of QYG was established by UHPLC‐Q‐Orbitrap‐MS. After analysis based on Compound Discoverer software and Global Natural Products Social (GNPS) platform, a total of 332 compounds were detected. Eleven Q‐markers were determined for the quality evaluation of QYG by comparison with the fingerprint of nine constituted herbal medicines. An adjusted multiple reaction monitoring (MRM) quantification method was further established to simultaneously determine the 11 Q‐markers for holistic quality evaluation of QYG. Conclusion This is the first study to report comprehensive multicomponent characterisation, identification, and quality assessment of QYG, which could be used for effective guarantee of the quality of QYG.