Profiles of Purine Metabolism and Purine Alkaloid Biosynthesis in Schima and Eurya Plants Fingerprint study of Wuji Pill by UPLC-MS/MS Rapid determination of 15 chemical drugs illegally added into slimming Chinese patent medicines and health foods by UPLC-MS/MS Promoting effect for transdermal enhancers on theophylline with fuzzy comprehensive evaluation method Synthesis of theophylline molecular imprinted polymer microspheres and their properties