Improved DPPH determination for antioxidant activity spectrophotometric assay

@article{Szabo2007ImprovedDD,
  title={Improved DPPH determination for antioxidant activity spectrophotometric assay},
  author={Maria-Raluca Szabo and Cornelia Idiţoiu and Dorina Rodica Chambre and Alfa Xenia Lupea},
  journal={Chemical Papers},
  year={2007},
  volume={61},
  pages={214-216}
}
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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