ARE	antioxidant response elements
BZF	2-(benzoyl)-2-hydroxy-3(2H)-benzofuranone derivative(s)
Caco-2	human colonic adenocarcinoma
CAT	catalase
CYP	cytochrome P450
DPPH	2,2-diphenyl-1-picrylhydrazyl
EpRE	electrophile response elements
FITC dextran	3–5-kDa dextran conjugated with fluorescein isothiocyanate
Ɣ-Glu–Cys ligase	gamma glutamate–cysteine ligase
GI	gastrointestinal
GSH	reduced glutathione
GSHpx	glutathione peroxidase
GSSGred	glutathione reductase
HO-1	heme oxygenase-1
Keap1	Kelch-like ECH-associated protein 1
NF-κB	nuclear factor kappa B
NQO1	NAD(P)H:quinone oxidoreductase 1
Nrf2-Keap1	nuclear factor (erythroid-derived 2)-like 2
NSAID	non-steroidal anti-inflammatory drugs
OAE	onion peel aqueous extract
PKC	protein kinase C
PKCζ	protein kinase C zeta type
Q-BZF	2-(3,4-dihydroxybenzoyl)-2,4,6-trihydroxy-3(2H)-benzofuranone
Qox	quercetin oxidation mixture
ROS	reactive oxygen species
SOD	superoxide dismutase
TEER	transepithelial electrical resistance