OBJECTIVE To compare two methods for the determination of tulobuterol. METHODS Non-aqueous titration method was performed with acetic acid and acetic anhydride(7∶3) as the solvent and crystal violet as indicator. The tulobuterol solution was titrated with 0.1 mol·L-1 perchloric acid solution. The end point was decided by potentiometric method and indicator method. The HPLC method was performed on a C18 column(250 mm×4.6 mm, 5 μm) with mobile phase of acetonitrile-5 mmol·L-1 phosphate buffer at flow-rate of ...
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