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The changes of remaining DPPH• in measuring systems during 30 min of the reaction between DPPH• and: a Caffeic acid or Ferulic acid or Trolox (for each antioxidant the concentration equals 0.25 mg/ml), b BHA or BHT or Propofol (for each antioxidant the concentration equals 0.50 mg/ml). The measurements were performed in methanol at 25 °C
