Liquid chromatography of xanthines, analgesic drugs and coffee.
D000700:Analgesics / Q000032:analysis*; D002021:Buffers; D002110:Caffeine / Q000032:analysis; D002852:Chromatography, Ion Exchange; D003069:Coffee / Q000032:analysis*; D000431:Ethanol; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins; D008722:Methods; D011137:Polystyrenes; D013662:Tea / Q000032:analysis; D014970:Xanthines / Q000032:analysis*
D000700:Analgesics; D002021:Buffers; D003069:Coffee; D007475:Ion Exchange Resins; D011137:Polystyrenes; D013662:Tea; D014970:Xanthines; D002110:Caffeine; D000431:Ethanol