Influence of food matrix and high-pressure processing on onion flavonols and antioxidant activity during gastrointestinal digestion

A dynamic in vitro gastrointestinal model (GID) was used to evaluate the effect of high-pressure processing (HPP) and food matrix on bioaccessibility and antioxidant activity (AA) of onion flavonols. A dietary supplement of quercetin was also submitted to GID. HPP (400 MPa/25 ºC/5 min) combined with freeze-drying produced a significant increase of major onion flavonols, Q-3,4′-DiGlu (5%), Q-4′-Glu (30%), Iso-3,4′-DiGlu (5%) and Q-3-Glu (14%). Onion flavonols concentration decreased gradually through GID. The most bioaccessible flavonols were quercetin-diglucosides (23–96%) and the less were quercetin-monoglucosides (5–23%) and quercetin-aglycone (6–10%). Although GID phases of HPP-onion presented higher total flavonol content (9–16%) than control-onion, the bioaccessibility of total flavonols in both samples were similar (∼17.63%) and significant higher than that of quercetin dietary supplement (0.028%). Then, onion matrix affected positively flavonol bioaccessibility. Significant positive correlations were found between total flavonol and AA determined by ABTS[rad] and FRAP and between total TP-FC and DPPH[rad] during GID.

Bibliographic Details

Main Authors:	Fernández-Jalao, Irene, Sánchez-Moreno, Concepción, Ancos, Begoña de
Other Authors:	Ministerio de Economía y Competitividad (España)
Format:	artículo biblioteca
Published:	Elsevier 2017
Subjects:	Quercetin, Onion, Dynamic in vitro gastrointestinal digestion, Bioaccessibility,
Online Access:	http://hdl.handle.net/10261/171386 http://dx.doi.org/10.13039/501100003329
Tags:	Add Tag No Tags, Be the first to tag this record!