Fig. 4From: Electrochemical investigations and theoretical studies of biocompatible niacin-modified carbon paste electrode interface for electrochemical sensing of folic acidCVs of 40.0 µM FA in 0.2 M PBS (pH 7.4) at bare/CPE (curve a) and NC/CPE (curve c), the curve b represents the voltammogram in absence of FA at NC/CPE; at the scan rate of 0.05 Vs−1Back to article page