Fig. 4.

Effect of methanol on the antioxidant capacity of red dragon juice stored at room temperature for 24 h. Pure methanol was mixed with freshly prepared red dragon juice at a ratio of 1:1 and stored at room temperature. Ferric ion reducing antioxidant power (FRAP) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity were measured and compared to the control (red dragon juice without methanol; juice + water, 1:1). Bars represent the mean ± standard deviation (SD) of three independent replicates. An asterisk (*) above the bars indicates a significant difference at that time-ponit between red dragon juice with methanol and control (Student's t-test, p <0.05).