Fig. 3From: A facile nano-iron oxide sensor for the electrochemical detection of the anti-diabetic drug linagliptin in the presence of glucose and metforminBackground-subtracted cyclic voltammograms at 50 mVs−1 at bare CPE, and ratios of Fe2O3NP/CPEs in 1 mM K4Fe(CN)6/0.1 M KCl solutionBack to article page