Low nanomolar concentrations of a quercetin oxidation product, which naturally occurs in onion peel, protect cells against oxidative damage
Author
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Fuentes, Jocelyn
Author
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Arias Santé, M. Fernanda
Author
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Atala Riffo, Elías
Author
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Pastene, Edgar
Author
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Kogan Bocian, Marcelo
Author
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Speisky Cosoy, Hernán
Admission date
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2020-05-08T14:08:46Z
Available date
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2020-05-08T14:08:46Z
Publication date
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2020
Cita de ítem
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Food Chemistry 314 (2020) 126166
es_ES
Identifier
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10.1016/j.foodchem.2020.126166
Identifier
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https://repositorio.uchile.cl/handle/2250/174577
Abstract
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The occurrence of the quercetin oxidation metabolite 2-(3,4-dihydroxybenzoyl)-2,4,6-trihydroxy-3(2H)-benzofuranone (BZF), whose antioxidant potency is notably higher than the antioxidant potency of quercetin, was investigated in twenty quercetin-rich plant foods. BZF was identified (HPLC-DAD-ESI-MS/MS) only in the dry outer scales of onions and shallots. Aqueous extracts of onions (OAE) and shallots (SAE) were evaluated for their antioxidant and cytoprotective properties. OAE, whose potency did not differ from SAE, protected ROS-exposed Caco2 cells against oxidative (78%) and cellular (90%) damage at a 3 mu g/L concentration (corresponding to 0.03 nM of BZF). After chromatographic resolution of OAE, the BZF peak accounted fully and exclusively for its antioxidant effect. The antioxidant effects of OAE and of a pure BZF were described by two perfectly overlapping curves whose concentration-dependence was within the 3 x 10(-4) to 10(2) nM BZF range. Such unprecedented low concentrations place BZF-containing plants on the frontier of the search for novel sources of antioxidants.
es_ES
Patrocinador
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Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) FONDECYT-1190053 21180410 21180870