Figure 4

The H2O2 scavenging activity of both the mandarin peel oil and the standard increased in a concentration-dependent manner (Fig. 4A). Interestingly, at a concentration of 1000 μg/mL, mandarin peel oil exhibited the highest superoxide removal action, with an IC50 value of 176.2 μg/mL (Fig. 4B). This indicates that the oil was more effective at scavenging the superoxide radicals than the standard, ascorbic acid.