Abstract
The antiradical properties of three samples of ginger (Zingiber officinale R.)-juice from fresh rhizome, essential oil, and extracts (oleoresin)-were studied and compared with the properties of synthetic antioxidant ionol (butylatedhydroxy-toluene, BHT). Reaction antioxidants with stable free 2,2-diphenyl-1-picrylhydrozyl radicals were used as model systems. DPPH equivalents per gram of ginger sample, EC50, and antiradical efficiency (AE) were determined. The EC50 and AE values for ginger oleoresin and BHT were similar. They were the same as those of highly active natural antioxidants, and the values for essential oil and ginger juice were lower by two orders of magnitude. On the base of kinetic parameters, the ginger samples may belong to antiradical compounds with prolonged action.
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