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Electrokinetic potential of some hydroxybenzoic acids and hydroxybenzoic acids-β-glucan models

Hydroxybenzoic acids are subgroup of phenolic acids. 4-hydroxybenzoic acid, gallic acid, vanillic acid, salicylic acid are some of hydroxybenzoic acids. Structure of hydroxybenzoic acids differ because of the hydroxylation and methylations of aromatic ring. β-glucan is soluble dietary fiber constructed of glucose units. Electrokinetic potential is also known as zeta potential. Zeta potential is a physical property expressed on the surface of a macromolecule, respectively as potential at the shear plane distance. Knowledge of the zeta potential could predict the long-term stable behaviour of a macromolecule. The aim of this work was to predict a long-term stability of macromolecules such as 4- hydroxybenzoic acid - β-glucan model and gallic acid - β-glucan model in different pH (1.5, 5.5, 7.5, 10) and during the time period (0, 1, 2, 5, 16 h). The zeta potential values have shown that analysed models have been stable in pH 10 according the theoretical stability criteria. In addition, absorption spectra of selected hydroxybenzoic acids and theirs models were recorded.

electrokinetic potential ; absorption spectra ; 4-hydroxybenzoic acid ; gallic acid ; β-glucan

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