Table 1.

In vitro assays commonly used to screen antioxidant activity of plants.

Sr. No.	Assay	Mechanism	References
1	β-Carotene or crocin-bleaching assay	Hydrogen atom transfer	Karadag et al. 63
2	ORAC (oxygen radical absorbance capacity)	Hydrogen atom transfer	Ou et al. 64
3	IOU (inhibited oxygen uptake)	Hydrogen atom transfer	Karadag et al. 63
4	LPIC (lipid peroxidation inhibition capacity) assay	Hydrogen atom transfer	Karadag et al. 63
5	TRAP (total radical trapping antioxidant parameter)	Hydrogen atom transfer	Karadag et al. 63
6	Copper reduction assay	Single electron transfer	Huang et al. 65
7	FRAP (ferric reducing antioxidant power assay	Single electron transfer	Huang et al. 65
8	Total phenolic content assay by Folin-Ciocalteu reagent	Single electron transfer	Karadag et al. 63
9	ABTS ({2,2' - azinobis-(3-ethyl-benzothiazoline-6-sulphonic acid)}) assay	Both hydrogen atom and single electron transfer	Huang et al. 65
10	DPPH (2,2-Diphenyl-1-picrylhydrazyl) assay	Both hydrogen atom and single electron transfer	Huang et al. 65