Hydroxycinnamic Acid Antioxidants: An Electrochemical Overview

Figure 3

Differential pulse voltammograms for 0.1 mM solutions of (a) (black line) ethyl caffeate, (blue line) ethyl 5-bromocaffeate, (green line) ethyl 3,4,5-trihydroxycinnamate acid; (b) (black line) ethyl ferulate, (blue line) ethyl 5-bromoferulate, (green line) ethyl sinapate; (c) (black line) caffeoylhexylamide, (red line) hydrocaffeoylhexylamide; and (d) (black line) feruloylhexylamide, (red line) hydroferuloylhexylamide, in physiological pH 7.3 supporting electrolyte. Scan rate: 5 mV s⁻¹.

(a)

(b)

(c)

(d)