Freeze-dried ABTS+ method: A ready-to-use radical powder to assess antioxidant capacity of vegetable oils

► ABTS radical was freeze-dried to obtain freeze-dried ABTS (FD-ABTS). ► FD-ABTS was found to be soluble in methanol and further dilutable in organic solvents. ► Freeze-drying found to cause no loss in radical activity of ABTS. ► High precision was achieved with FD-ABTS method in model oil samples.