Evaluation of antiradical properties of components of the ginger root

Antiradical properties of components of juice of the fresh ginger root and essence and oleoresin of ginger (Zingiber officinale R.) were studied and compared with the properties of the ionol synthetic antioxidant. A reaction with the stable free 2,2-diphenyl-1-picrylhydrazyl radical was used for the evaluation of the antiradical properties. Rates of the fast phase of this reaction and equivalent concentrations of the antiradical components in the ginger samples were determined from kinetic curves of this reaction phase. The values of EC50 and antiradical efficacy (AE) found for the ginger oleoresin were close to those of ionol and characteristic of highly active natural antioxidants, whereas the same values for the ginger essence and juice were two orders of magnitude lower. The ginger preparations belonged to the antiradical compounds of prolonged action according to their kinetic parameters.