Quality analysis of Polygala tenuifolia root by ultrahigh performance liquid chromatography–tandem mass spectrometry and gas chromatography–mass spectrometry  Dan Wu, Jirui He, Yueming Jiang, Bao Yang  Journal of Food and Drug Analysis  Volume 23, Issue 1, Pages 144-151 (March 2015) DOI: 10.1016/j.jfda.2014.07.009 Copyright © 2014 Terms and Conditions

Fig. 1 Ultrahigh-performance liquid chromatography–tandem mass spectrometry and gas chromatography–mass spectrometry profiles of Polygala tenuifolia root. (A) Total ion chromatogram analyzed by ultrahigh-performance liquid chromatography–tandem mass spectrometry; (B) total ion chromatogram analyzed by gas chromatography–mass spectrometry. Journal of Food and Drug Analysis 2015 23, 144-151DOI: (10.1016/j.jfda.2014.07.009) Copyright © 2014 Terms and Conditions

Fig. 2 Structures of characteristic metabolites in Polygala tenuifolia root. Journal of Food and Drug Analysis 2015 23, 144-151DOI: (10.1016/j.jfda.2014.07.009) Copyright © 2014 Terms and Conditions

Fig. 3 Plots of PCA on semipolar and volatile metabolites of Polygala tenuifolia root. (A) Loading plot and score plot are the results of semipolar metabolites; (B) loading plot and score plot are the results of volatile metabolites. Journal of Food and Drug Analysis 2015 23, 144-151DOI: (10.1016/j.jfda.2014.07.009) Copyright © 2014 Terms and Conditions