Table 2.

A summary of the antioxidant capacity of flavonoids and phenolic acids of different oregano species.

Oregano Species	Extract	Compounds	Plant Part	Antioxidant Assay	Reference
Coleus aromaticus	Methanol	Rosmarinic, caffeic, p-coumaric and gallic acids; quercetin and rutin	Stem	DPPH, superoxide, TAC	[69]
Eryngium foetidum	Aqueous, methanol	Gallic, protocatechuic, syringic, p-coumaric, ferulic and sinapic acids	Leaves	TPC, DPPH	[70]
Lippia alba	Aqueous	Apigenin-7-O-diglucuronide, chrysoeriol-7-O-diglucuronide, tricin-7-O-diglucuronide, luteolin-7-O-glucuronide	Leaves	TPC, DPPH	[21]
Lippia graveolens	Methanol	Rosmarinic acid, naringenin	Aerial parts	TPC, DPPH	[71]
	Methanol	Eriodictyol, naringenin, hispidulin, cirsimaritin	Leaves, commercial herbs	TPC, ORAC	[30]
Origanum dictamnus	Sequentially with hexane, acetone and methanol; Aqueous	Methanolic: gallic, caffeic, ferulic and rosmarinic acids. Aqueous: gallic, caffeic, protocatechuic and rosmarinic acids	Leaves	TPC, DPPH, FRAP	[72]
	Aqueous	Rosmarinic, caffeic and vanillic acids, epicatechin, catechin, genistein	Leaves and flowers	TPC, DPPH, FRAP	[34]
Origanum glandulosum	Methanol, previously deffated with n-hexane	Caffeic acid, luteolin glucoside	Not specified	DPPH, FRAP	[73]
Origanum majorana	Methanol microwave-assisted	Rosmarinic and caffeic acid, apigenin, rutin	Aerial parts	TPC, DPPH, CUPRAC	[75]
	Aqueous, methanol	Rosmarinic and caffeic acids	Leaves	TPC, DPPH, β-carotene bleaching	[76]
	Methanol	Rosmarinic acid, eriodictyol, naringenin, hispidulin, cirsimaritin	Leaves, commercial herbs	TPC, ORAC	[30]
	Methanol	Rosmarinic acid, epigallocatechin, quercetin, apigenin	Not specified	DPPH, FRAP	[39]
	Ethanol	Chlorogenic, ferulic, p-coumaric, p-hydroxybenzoic, protocatechuic, rosmarinic and syringic acids, quercetin	Not specified	TPC, DPPH, ABTS	[77]
Origanum microphyllum	Aqueous	p-Hydroxybenzoic, protocatechuic, syringic and caffeic acids, naringenin	Leaves and flowers	TPC, FRAP	[26]
Origanum vulgare	Methanol	Rosmarinic acid	Leaves	TPC, ORAC	[78]
	Methanol	Rosmarinic acid and (−)-epicatechin	Leaves	DPPH; ABTS, FRAP	[10]
	Water, methanol, ethyl acetate, hexane	Rosmarinic, caffeic, chicoric and p-coumaric acids	Leaves	TPC, DPPH, TAC, RP, superoxide	[32]
	Methanol	Rosmarinic acid, eriodictyol, naringenin	Leaves	TPC, ORAC	[30]
Origanum vulgare	Methanol	Rosmarinic and caffeic acids, luteolin-7-O-glucoside, apigenin-7-O-glucoside	Not specified	TPC, FRAP	[79]
	Aqueous	Eriodictyol, apigenin, caffeic acid, kaempferol	Not specified	TPC, DPPH	[80]
Thymbra capitata	Ethyl acetate, ethanol	Ethyl acetate: taxifolin di-O-glucoside, thymusin. Ethanol: taxifolin di-O-glucoside, rosmarinic acid	Aerial parts	TPC, superoxide	[81]