RESUMO
@#Objective To develop and verify a chemical choromogenic method for the determination of residual cetyltrimethylammonium bromide(CTAB)content in ACYW135 meningococcal polysaccharide stock solution. Methods A chemical chromogenic method was developed for the determination of residual CTAB content by using titan yellow as chromogenic reagent,and verified for the linear range,intermediate precision and accuracy. ACYW135 meningococcal polysaccharide stock solution were determined for residual CTAB content by the developed method. Results The CTAB reference at concentrations of 4. 0～10. 0 μg/mL showed good linear relationship to A_(500),with a R~2 value of more than 0. 990. The recovery rates of CTAB standard at concentrations of 5. 0,7. 0,and 9. 0 μg/mL were all within 95% ～ 110% in six repeated tests,with the CV values of determination results of less than 10%. All the residual CTAB contents in four batches of meningococcal polysaccharide stock solutions were less than 8. 0 μg/mL. Conclusion The chemical chromogenic method showed good linearity,intermediate precision and accuracy,which might be used for the determination of residual CTAB content in ACYW135 meningococcal polysaccharide stock solution.