The capacity for scavenging 2,2-diphenyl-1-picrylhydrazyl
(DPPH) radicals was assessed by measuring the bleaching of
a black-coloured methanol solution containing DPPH radicals,
as described by Yao, Sang, Zhou, and Ren (2010). Trolox
was used as the reference compound. The results are expressed
in μmol of Trolox equivalents per g of dry weight (μmol
TE/g DW). The linear range of the calibration curve was 100–
1000 μM.