Why do the absorbance values of different concentrations of ascorbic acid solutions mixed with DPPH free radicals stay constant?

By means of serial dilution, I've prepared a range of aqueous ascorbic acid solutions (from 200 to 1 µg/ml). From each concentration I took 1 ml and mixed it with 1 ml of DPPH ethanolic (99.8%)...

27 January 2021 630 14 View