Fig. 9From: Sensitive and selective determination of vitamin B2 in non-alcoholic beverage and milk samples at poly (glutamic acid)/zinc oxide nanoparticles modified carbon paste electrodeA SWVs of 5 µM vitamin B2 at poly (glutamic acid)/ ZnO NPs–CPE in 0.1 M PBS of various pH values (3.5, 4, 5, 5.5, 6, 6.5, 7.5, 8 and 8.5), B Effect of pH on the current responses of vitamin B2 and C Plots of peak potential of vitamin B2 versus the pH of buffer solutionBack to article page