engleski

Zeta potential of some hydroxycinnamic acids

Polyphenol acids are plant metabolites found in food. They contain a phenolic ring and at least one organic carboxylic acid function. Caffeic, chlorogenic, ferulic acids are some of the hydroxycinnamic acids. In food, hydroxycinnamic acids are found in the form of esters. β-glucan is a polysaccharide that belongs to the group of soluble fibres. Zeta potential is also called electrokinetic potential, which represents a physical property on the surface of a macromolecule. Also, zeta potential is defined as the potential at the distance of the shear surface. Knowing the zeta-potential allows predicting the long-term most stable behaviour of a macromolecule. Stability of a macromolecule depends on the zeta potential and the charge on the surface and the macromolecule. One of the aims of this work is to determine the zeta potential of hydroxycinnamic acids solutions, β- glucan solution and hydroxycinnamic acids and β- glucan model through different concentration ranges. The second aim is the prediction of the most stable behaviours of hydroxycinnamic acids and β-glucan models at different pH values. In addition, absorption spectra were recorded. Zeta potential of hydroxycinnamic acids and β- glucan model had shown in acidic medium positive values and alkali medium negative values. The highest zeta potential value of hydroxycinnamic acids and β-glucan model had reached in pH 10. According to the stability criteria, hydroxycinnamic acids and β-glucan model had shown the most stable behaviour at pH 10. The change of pH value had a great influence on the chemical structure and the zeta potential value of analyzed models.

zeta potential ; caffeic acid ; chlorogenic acid ; β-glucan

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