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β-Glucan and Aronia (Aronia melanocarpa) Phenolics: Interactions During In Vitro Simulated Gastrointestinal Digestion and Adsorption
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Department of Applied Chemistry and Ecology, Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology Osijek, Franje Kuhača 18, HR 31000 Osijek, Croatia
Lidija Jakobek   

Department of Applied Chemistry and Ecology, Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology, Franje Kuhača 18, 31000, Osijek, Croatia
Submission date: 2022-06-11
Acceptance date: 2022-10-10
Online publication date: 2022-11-14
Publication date: 2022-11-14
Pol. J. Food Nutr. Sci. 2022;72(4):371–380
Interactions between phenolics and dietary fibers, such as β-glucan, are important for the bioactivities of phenolics. However, interactions between aronia phenolics and β-glucan in the digestion process, both promoted for their health benefits, have not been studied. The aim was to study the interactions between aronia phenolics and β-glucan in an in vitro simulated digestion and in the adsorption process. After extracting aronia phenolics with chemically- and enzymatically-assisted extraction, and characterizing the phenolics, the aronia extract was subjected to simulated oral, gastric, and intestinal digestion without or with β-glucan. Flavonol release increased throughout oral, gastric, and intestinal digestion, while the recovery of phenolic acids and anthocyanins after an increase in the gastric phase, decreased in the intestinal phase. β-Glucan entrapped phenolics, lowering the quantities of recovered phenolics. It also adsorbed aronia phenolics at pH 1.5, 3.0, and 7.0. In comparison to 15 and 30 mg/L concentrations of β-glucan, a solution with the lower concentration (15 mg/L) allowed for the entrapment of the higher quantity of phenolics and had high adsorption capacity. Entrapment of aronia phenolics by β-glucan is important for the bioaccessibility and concentration of phenolics that reach the lower parts of the digestive tract which depends on β-glucan concentration.
Authors would like to thank to Prof. Andrew R. Barron from Yale University (USA) for his help in English editing and the interpretation of statistical analysis.
This work was supported by the Croatian Science Foundation [grant number HRZZ-IP-2016-06-6777]. The work of J.I. was financed by European social fund, Operational Program 2014-2020, aim 10.II.3.
Authors declare no potential conflicts of interests.
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