Abstract
An improved procedure for determination of the residual DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical concentration was proposed taking into account the absorbance of both DPPH free radicals and DPPH nonradical (1,1-diphenyl-2-picrylhydrazine) stable form. The calculated residual DPPH free radical concentrations were compared with those obtained from a calibration curve and variation coefficients below 10 % were found.
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Szabo, M.R., Idiţoiu, C., Chambre, D. et al. Improved DPPH determination for antioxidant activity spectrophotometric assay. Chem. Pap. 61, 214–216 (2007). https://doi.org/10.2478/s11696-007-0022-7
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DOI: https://doi.org/10.2478/s11696-007-0022-7