Fig. 7From: Electrochemical investigations and theoretical studies of biocompatible niacin-modified carbon paste electrode interface for electrochemical sensing of folic acidA Cyclic voltammograms of FA in 0.2 M PBS (pH 7.4) at NC/CPE at scan rate of 0.05Vs−1 with different concentration (a-i; 5.0 µM to 45.0 µM). B Graph of anodic peak current versus concentration of FABack to article page