Please can anyone explaine why a plant extract can be an excellent hydrogen donnor (DPPH test) but a very weak electron donnor ( reducing power) ?

I found an IC50 of a plant extract in DPPH 6 µg/ml but EC50 in reducing power 140 µg/ml. I woundred to know if I make a mistake or there is a logic explanation?

20 May 2019 4,328 2 View