Naslov
Adsorption isotherms for stuying interactions between flavonols and anthocyanins from aronia and β-glucan

Autori
Jakobek, Lidija ; Matić, Petra ; Buljeta, Ivana ; Ištuk, Jozo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstract 18. Ružička days "Today science- Tomorrow industry" / Jukić, Ante - Zagreb : Osijek : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI) ; Prehrambeno tehnološki fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku, 2020, 102-102

ISBN
978-953-7005-72-6

Skup
International conference 18. Ružička days "Today science-Tomorrow industry"

Mjesto i datum
Vukovar, Hrvatska, 16.09.2020. - 18.09.2020

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
interactions ; polyphenols ; dietary fibers ; bioactivities

Sažetak
It has been shown previously that traditional apple varieties have higher amounts of polyphenols than commercial varieties. That is why these apples are being investigated for various beneficial effects. Beneficial effects of polyphenols are often connected to their bioaccessibility. Bioaccessibility of polyphenols can be influenced by their interactions with other macromolecules present in the food matrix such as dietary fibers. Interactions between polyphenols and dietary fibers can be studied through the adsorption process. In this work we studied interactions of individual polyphenols from flesh and peel of two traditional varieties of apples and dietary fiber β-glucan by studying adsorption process. Polyphenols were extracted by using ultrasonic assisted extraction, identified and quantified by using reversedphase high-performance liquid chromatography (RP-HPLC) and separated into two fractions by using Sephadex LH-20. Polyphenols from fractions were adsorbed onto β-glucan for 5 h, at pH 5.5. The amount of adsorbed polyphenols was calculated (qe). Phenolic acids (chlorogenic acid, chlorogenic acid isomer, p-coumaroylquinic acid) and anthocyanins (cyanidin-3-galactoside) were present in the first, and flavonols (quercetin-3-galactoside, quercetin-3-glucoside, quercetin-3-xyloside, quercetin-3-rhamnsoide, two additional quercetin derivatives) and dihydrochalcones (phloretin-2’-glucoside) in the second fractions. Polyphenols from the peel adsorbed in higher amount onto β-glucan (0.7 to 82 mg g-1) than polyphenols from the flesh (3.3 to 12.4 mg g-1). The adsorption was concentration dependent and it can be suggested that bonds between polyphenols and β-glucan can be H bonds or Van der Waals forces.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA