Improved high-performance liquid chromatographic assay for theophylline in plasma and saliva in the presence of caffeine and its metabolites and comparisons with three other assays.
D002110:Caffeine / Q000378:metabolism / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D003069:Coffee; D006801:Humans; D012463:Saliva / Q000032:analysis*; D013806:Theophylline / Q000032:analysis* / Q000097:blood / Q000302:isolation & purification / Q000378:metabolism
D003069:Coffee; D002110:Caffeine; D013806:Theophylline; C021183:1,7-dimethylxanthine