
Keywords: APCI-MS; Atmospheric-pressure chemical ionization mass spectrometry; APPI-MS; Atmospheric-pressure photoionization mass spectrometry; CA; Cholic acid; CAT; 1,2-Dihydroxybenzene (benzene catechol); CAT-Q; 1,2-Dihydroxybenzene-Quinone; CID; Collision-in