According to this technique, direct production of the (blue/green)
2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium
salt radical cation (ABTS+
) chromophore was achieved via
reaction between ABTS and potassium persulfate; this method is
able to quantify both water and lipid-soluble antioxidants, as pure
compounds or in crude extracts containing them