Study of the adsorption process between the phenolic compound catechin and the dietary fiber zymosan A: The influence of pH and concentration

Abstract

Polyphenolic compounds have shown various beneficial effects on human health as well as certain bioactivities such as interactions with dietary fiber. Factors that can influence their interactions with dietary fibers include the pH value, the polyphenolic compound concentration and compound stability. The aim of this work was to study the interactions between the polyphenolic compound catechin and the dietary fiber zymosan A from yeast through investigation of the adsorption process. The catechin stability and the influence of concentration and pH value on interactions were investigated. Catechin showed the lowest stability at pH 7.0 with degradation ratio from 6 to 15 %. The lowest adsorption capacity was at pH 7.0, then higher in water and the highest at pH 1.5. A Dubinin–Radushkevich adsorption model fit to the data and FTIR analysis indicates the presence of physical interactions between catechin and zymosan A. This study can contribute to better understanding of interactions of polyphenols and dietary fiber for possible design of functional food, or to increase bioaccessibility of polyphenols.

Keywords

• catechin
• zymosan a
• adsorption
• interactions
• stability
• bioavailability