Fig. 4
From: Electrochemical oxidation of provitamin B5, d-panthenol and its analysis in spiked human urine
Square wave voltammograms with increasing concentrations of DP in pH 4.2 phosphate buffer solution at glassy carbon electrode: (a) blank, (b) 8 × 10−6, (c) 3 × 10−5, (d) 5 × 10−5, (e) 6 × 10−5, (f) 7 × 10−5, (g) 9 × 10−5, (h) 1 × 10−4, (i) 4 × 10−4, and (j) 1 × 10−3 M. Inset plot of concentration (C) versus peak current (I p/μA)