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IC50 values of higenamine and Trolox in 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide radical (PTIO•)-scavenging assay at pH 4.5, 6.0 and 7.4. Means values with different superscripts (a or b or c) for the same sample are significantly different (p < 0.05).
