Izvorni znanstveni članak
https://doi.org/10.17508/CJFST.2018.10.1.13
An equilibrium and kinetic study of phenolic acids adsorption onto β-glucan
PETRA MATIĆ
orcid.org/0000-0003-0804-1280
; Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology Osijek, Department of Applied Chemistry and Ecology, Franje Kuhača 20, 31000 Osijek, Croatia
LIDIJA JAKOBEK
orcid.org/0000-0002-4846-327X
; Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology Osijek, Department of Applied Chemistry and Ecology, Franje Kuhača 20, 31000 Osijek, Croatia
ŠIME UKIĆ
orcid.org/0000-0001-6567-459X
; University of Zagreb, Faculty of Chemical Engineering and Technology, Department of Analytical Chemistry, Marulićev trg 19, 10000 Zagreb, Croatia
Sažetak
Phenolic acids belong to the group of natural polyphenols, which are
secondary plant metabolites. Polyphenols show many positive bioactivities,
which are not completely investigated. One of these bioactivities is the
polyphenol interaction with food compounds, such as lipids, proteins, and
dietary fibres. The information about the interactions between polyphenols and
dietary fibres can be obtained through the parameters of adsorption
equilibrium models, like Freundlich, Langmuir, Dubinin-Radushkevich, and
others. Also, the reaction order and the kinetic constants can be obtained
through kinetic models, like pseudo-first and pseudo-second order models.
The objective of this study was to obtain information about the interactions
between phenolic acids, like, p-coumaric and caffeic acid, and β-glucan as a
natural dietary fibre, through non-linear adsorption models and kinetic models
of the pseudo-first and pseudo-second order. The adsorption was carried out at
25 °C for 16 h, in a model solution which contained polyphenol, β-glucan and
phosphate buffer pH 5.5. Kinetics was conducted at 25 °C during 1, 2, 5, 10,
and 16 h. After reaching the adsorption equilibrium, the un-adsorbed
polyphenols were separated from the adsorbed ones by ultrafiltration. The
non-linear adsorption equilibrium models and kinetic models were
determined. Adsorption process of phenolic acids and β-glucan was favored
and chemical, and was best described by the pseudo-second order model.
Ključne riječi
adsorption; kinetic; phenolic acid; β-glucan
Hrčak ID:
200554
URI
Datum izdavanja:
25.5.2018.
Posjeta: 1.305 *