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DPPH free radical scavenging activity of natural (S,S)-SDG-1, synthetic (S,S)-SDG-1 and (R,R)-SDG-2, ascorbic acid, and α-tocopherol. The radical scavenging activity was measured as a decrease in the absorbance of DPPH at 517 nm. The results are presented as mean ± standard deviation (n = 3). *p < 0.05 significantly lower than all other compounds, **p < 0.05 significantly lower than natural (S,S)-SDG-1.
