The biologically active substances influence of an aspen bark water extract complex on free radical oxidation processes in a model system іn vitro in broad ranges of concentration was investigated: an aspen bark water extract — 62–123 mkg/ml, flakumin — 28–55 mkg/ml. The concentration increasing of the investigated extract and preparation of сomparison was accompanied by their antioxidant activity amplification and depressing of a chemiluminescence in a model system. As compared with the known classical antioxidant flakumin the investigated extract has antioxidant action in average, that confirms anti-inflammatory action of the extract.
