
																
																	Validated RP-UHPLC PDA and GC–MS methods for the analysis of psychoactive alkaloids in Sceletium tortuosum
																
																
																
															Keywords: CNS, central nervous system; ICH, International Conference of Harmonisation; PDE, phosphodiesterase; SIM, selective ion monitoring; PDA, photodiode array; Sa, uncertainty in the y intercept; Sb, uncertainty in the slope; Sy/x, random calibration uncertain