Synthesis and Antioxidative Activity of Piperine Derivatives Containing Phenolic Hydroxyl

Figure 4

Duration of the protective effects of piperine derivatives on AAPH-induced hemoglobin oxidation in erythrocytes and time curves. (a) Time curves of the protective effects of piperine derivatives on AAPH-induced hemoglobin oxidation at a concentration of 50 μM. (b) The relationship between the protective effects of piperine derivatives at different concentrations and AAPH-induced hemoglobin oxidation after 4 h incubation.

(a)

(b)