title: Spectrophotometric determination of tetracycline and doxycycline in pharmaceutical preparations.
mesh_terms: D004318:Doxycycline / Q000032:analysis*; D007202:Indicators and Reagents; D013056:Spectrophotometry, Ultraviolet; D013752:Tetracycline / Q000032:analysis*
chemical_list: D007202:Indicators and Reagents; D013752:Tetracycline; D004318:Doxycycline