Objective To develop and verify a HPLC method for determination of free protein content in groups A & C meningococcal polysaccharide conjugate vaccine. Methods The free protein content in groups A & C meningococcal polysaccharide conjugate vaccine was determined by HPLC on TSKgel G3000 SW column(300 mm × 7. 5 mm, 10 μm),using 0. 01 mol / L phosphate buffered saline as mobile phase at a flow rate of 0. 5 ml / min. The sample load, detection wavelength and column temperature were 100 μl, 280 nm and room tempe...