Fig. 3From: Sensitive and selective determination of vitamin B2 in non-alcoholic beverage and milk samples at poly (glutamic acid)/zinc oxide nanoparticles modified carbon paste electrodeCVs of 5.0 mM [Fe (CN)6] 3−/4− in 0.1 M KCl at a BCPE, b ZnO NPs–CPE, c poly (glutamic acid)/CPE and d poly (glutamic acid)/ZnO NPs–CPE at a scan rate of 100 mVs−1Back to article page