Antioxidant and anti-inflammatory activities of six flavonoids separated from licorice.

•Six flavonoids were isolated from two Glycyrrhiza species.•Some of the isolates displayed potent antioxidant and/or anti-inflammatory activity.•The antioxidant and/or anti-inflammatory activities of three flavonoids were first reported.•These isolated flavonoids were quantified in four Glycyrrhiza species.