
DPPH-HPLC-MS assisted rapid identification of endothelial protective substances from Xiao-Ke-An
Keywords: MTT; DPPH-HPLC-MS; 2,2â²-diphenyl-1-picrylhydrazyl high performance liquid chromatography coupled with mass spectrometry; XKA; Xiao-Ke-An formula; t-BHP; tert-butyl hydroperoxide; DMEM; Dulbecco's modified Eagle's medium; FBS; fetal bovine serum; MTT; 3-(4,5-