... thi dextromethorphan HBr, chlorpheniramine maleate, guaifenesin thuục Methorphan bng phng phap trc quang" Chng TNG QUAN TI LIU 1.1 Tng quan v dextromethorphan hydrobromide, chlorpheniramine maleate, ... LI CAM OAN Tụi xin cam oan: ti "Xỏc nh ụng thi dextromethorphan HBr, chlorpheniramine maleate, guaifenesin thuục Methorphan bng phng phỏp trc quang" l bn thõn tụi thc hin Cỏc s liu, kt qu ti ... phõn t ca dextromethorphan HBr, chlorpheniramine maleate, guaifenesin 29 3.2 Kho sỏt s ph thuc hp th quang ca DEX, CPM v GUA vo pH .30 3.3 Kho sỏt s ph thuc hp th quang ca...