Adsorption of grape pomace (Vitis vinifera) and pecan shell (Carya illinoensis) phenolic compounds to insoluble dietary fiber

• Main Author: SUBIRÍA-CUETO,Carlos Rodrigo
• Publication Date: 2022
• Other Authors: MUÑOZ-BERNAL,Óscar Adrián, ROSA,Laura A. de la, WALL-MEDRANO,Abraham, RODRIGO-GARCÍA,Joaquín, MARTINEZ-GONZALEZ,Alejandra I., GONZÁLEZ-AGUILAR,Gustavo, MARTÍNEZ-RUIZ,Nina del Rocío, ALVAREZ-PARRILLA,Emilio
• Format: Article
• Language: eng
• Source: Food Science and Technology (Campinas)
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612022000101308
• topic: phenolic compounds-dietary fiber interactions; adsorption isotherm; by-products; HPLC-MS/MS; Langmuir isotherm; Freundlich isotherm

Abstract Grape pomace (GP) and pecan shell (PS) are agro-industrial by-products rich in healthy bioactives, mainly phenolic compounds (PC) and dietary fiber (DF). Raw GP and PS were chemically characterized, and the adsorption isotherms of their PC-insoluble DF (IDF) complexes were evaluated. GP and PS statistically differed (p < 0.05) in chemical and physicochemical properties. Total PC, total flavonoids, and IDF were higher in GP. Thirteen and eight PC were identified in GP and PS by HPLC-MS/MS chromatography, finding isoquercetin and type B dimer and trimer procyanidins as the most abundant compounds. PC-IDF (phenolic compounds-insoluble dietary fiber) adsorption isotherms were determined by both spectroscopic (Freundlich) and HPLC-MS/MS (Freundlich/Langmuir) techniques, observing that PS IDF presented higher PC adsorption at all tested concentrations. Epicatechin, isoquercetin, and quercetin were the main identified PC in both by-products, and were able to fit to both Langmuir and Freundlich isotherm by HPLC-MS/MS.