. 2023 Oct 27;24(21):15667. doi: 10.3390/ijms242115667

Table 2.

Flavonoids oxidation peak potentials, E_p vs. Ag/AgCl (3 M KCl), correlated with their substituent groups.

FLAVONOIDS		E_p¹/V	E_p²/V	pH	SUBSTITUENTS							REF
FLAVONOIDS		E_p¹/V	E_p²/V	pH	3^C	5^A	7^A	2′	3′	4′	5′	REF
FLAVONES	Apigenin	0.68/0.82	0.99	4.3	H	OH	OH	H	H	OH	H	[24,25,26,27]
	Acacetin	–	0.98	4.3	H	OH	OH	H	H	OCH₃	H	[25]
	Luteolin	0.40	1.05	4.0	H	OH	OH	H	OH	OH	H	[28,29,30,31]
	Orientin	0.25	0.83	7.0	H	OH	OH	O-sugar	OH	OH	O-sugar	[32]
	Diosmin	0.70	1.08	4.0	H	OH	O-sugar	H	OH	OCH₃	H	[33,34]
	Diosmetin	0.68	1.06	4.0	H	OH	OH	H	OH	OCH₃	H	[34]
	Isorhoifolin	0.65	1.10	5.0	H	OH	O-sugar	H	H	OH	H	[34]
	Linarin	–	1.10	5.0	H	OH	O-sugar	H	H	OCH₃	H	[34]
	Chrysin	–	1.05	4.0	H	OH	OH	H	H	H	H	[24,35,36]
FLAVANONES	Eriodictyol	0.25	0.83	7.0	H	OH	OH	H	OH	OH	H	[32]
	Hesperitin	0.52	1.00	7.0	H	OH	OH	H	OH	OCH₃	H	[37]
	Hesperidin	0.65	–	5.0	H	OH	O-sugar	H	OH	OCH₃	H	[38]
	Naringenin	0.71	0.95	7.0	H	OH	OH	H	H	OH	H	[37]
	Naringin	0.39	–	5.0	H	OH	O-sugar	H	H	OH	H	[38,39]
FLAVONOLS	Myricetin	0.30	–	3.6	OH	OH	OH	H	OH	OH	OH	[38,40]
	Quercetin	0.20	0.4	7.0	OH	OH	OH	H	OH	OH	H	[37,38,41,42,43,44]
	Rutin	0.40	1.06	4.0	O-sugar	OH	OH	H	OH	OH	H	[24,38,45,46,47]
	Quercetrin	0.32	–	5.0	O-sugar	OH	OH	H	OH	OH	H	[38,48]
	Fisetin	0.35	–	5.0	OH	H	OH	H	OH	OH	H	[38,44,49,50]
	Rhamnetin	0.30	–	4.5	OH	OH	OCH₃	H	OH	OH	H	[38]
	Isorhamnetin	0.36	1.15	4.0	OH	OH	OCH₃	H	OH	OH	H	[44,51]
	Morin	0.44	0.98	4.0	OH	OH	OH	OH	H	OH	H	[24,44,52,53,54,55]
	Kaempferol	0.45	–	3.6	OH	OH	OH	H	H	OH	H	[40,44,56]
	Galangin	0.50	–	5.0	OH	OH	OH	H	H	H	H	[24,38]
	Robinin	0.75	0.95	7.0	O-sugar	OH	O-sugar	H	OH	H	H	[32]
FLAVANONOLS	Taxifolin	0.39	1.03	4.0	OH	OH	OH	H	OH	OH	H	[35]
FLAVANOLS	Catechin	0.28	0.61	7.0	OH	OH	OH	H	OH	OH	H	[37,57,58,59]
	Epicatechin	0.21	0.60	7.0	OH	OH	OH	H	OH	OH	H	[37]
	Epicatechin gallate	0.45	0.87	2.0	gall	OH	OH	H	OH	OH	H	[60]
	Epigallotechin gallate	0.38	0.89	2.0	gall	OH	OH	H	OH	OH	OH	[61]
ISOFLAVONOIDS	Genistein	0.48	0.67	7.0	H (2^C)	OH	OH	H	H	OH	H	[25,26]
	Biochanin	–	0.69	7.0	H (2^C)	OH	OH	H	H	OCH₃	H	[26]
	Daidzein	0.50	0.72	7.0	H (2^C)	H	OH	H	H	OH	H	[26]
ANTHOCYANIDINS	Cyanidin	0.40	0.82	4.5	OH	OH	OH	H	OH	OH	H	[62]
	Malvidin	0.49	0.85	4.5	OH	OH	OH	H	OCH₃	OH	OCH₃	[62]
	Peonidin	0.35	0.82	4.5	OH	OH	OH	H	OCH₃	OH	H	[62]
	Petunidin	0.040	0.85	4.5	OH	OH	OH	H	OCH₃	OH	OH	[62]