Phenolic extracts of brewers' spent grain (BSG) as functional ingredients - Assessment of their DNA protective effect against oxidant-induced DNA single strand breaks in U937 cells

► Anti-oxidant potential of phenolic extracts of brewers' spent grain in vitro. ► Oxidant-induced DNA damage using Comet assay in U937 cells. ► Protection against damage induced by H2O2 and SIN-1, but not by t-BOOH and 4-NQO. ► Relationship between total phenol content and anti-oxidant potential.