Fig. 2From: UHPLC-QQQ-MS/MS assay for the quantification of dianthrones as potential toxic markers of Polygonum multiflorum Thunb: applications for the standardization of traditional Chinese medicines (TCMs) with endogenous toxicityOptimization of different parameters of the method of sample solution, A type of extractant, B volume of extractant and C ultrasound timeBack to article page