engleski

Adsorption study of polyphenols from apples and β- glucan from barley

Polyphenols are secondary plant metabolites that can be found in different sources like apples. Since apples are available around whole year, they are a good source of polyphenols in the human diet. Polyphenols showed numerous bioactivities. They can interact with other food constituents like dietary fiber. One of the dietary fiber which can be found in different cerals is β-glucan. It was shown that β-glucan can interact with polyphenols and these interaction can influence the potentially beneficial bioactivities of polyphenols. Polyphenols and β-glucan interactions can be studyed through the adsorption process, where polyphenol is an adsorbate and β-glucan is an adsorbent. In equilibrium, different adsorption models like Freundlich and Langmuir can be applied in order to obtain the parameters of these models. The aim of these work was to study the adsorption between polyphenols from apple peel and flesh and β-glucan from barley. Polyphenols were extracted by ultrasound assisted extraction from apple peel and flesh with 80 % methanol. The adsorption was conducted between polyphenols from apple peel and flesh at 25 °C and pH 5.5. During the adsorption, polyphenols adsorbed onto β-glucan. The un- adsorbed polyphenols were determined by reversed- phase high performance liquid chromatography (RP- HPLC). After the adsorption process, adsorption models like Freundlich and Langmuir were applied. The results showed that polyphenols from apple peel showed slighty higher adsorption capacity then polyphenols from apple flesh. Also, adsorption proces between polyphenols and β-glucan were favoured.

adsorption ; polyphenols ; apples ; β-glucan ; adsorption models

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