Measurement of antioxidant ability of melatonin and serotonin by the DMPD and CUPRAC methods as trolox equivalent

Figures & data

Figure 1.  The chemical structures of melatonin and serotonin.

Figure 2.  DMPD^√+ scavenging values of trolox at different concentrations (20–100 μg/mL) for determination of calibration curve (r²:0.9831).

FIG  3 DMPD^√+ scavenging capacity of different concentrations (10–100 μg/mL) of melatonin (r²:0.9823) and serotonin (r²:0.9860) expressed as trolox equivalent antioxidant activity (TEAC).

Figure 4.  Cupric ion (Cu²⁺) reducing ability of the trolox at 450 nm and different concentrations (5–50 μg/mL; r²:0.9913) for determination of calibration curve.

Figure 5.  Cupric ion (Cu²⁺) reducing values of different concentrations (10–100 μg/mL) of melatonin (r²:0.9951) and serotonin (r²:0.9961).