Abstract
Cationic cross-linked starches having quaternary ammonium groups (CCS) and tertiary amine groups (CTAS) were used for equilibrium adsorption of chlorogenic acid (CGA) from aqueous solution. The parameters of the Langmuir, Freundlich and Dubinin-Radushkevich adsorption models showed that driving forces of adsorption were interactions between cationic groups of starches and carboxylic group of acid. The values of parameters of both adsorption models and thermodynamic parameters showed that CGA has higher affinity to CTAS than CCS, the adsorption proceeds more favourably with higher exothermic effect and bigger changes in the systems order. Immobilization of CGA on CTAS and especially on CCS prevented the rapid loss of antioxidant activity. CGA adsorbed on CTAS and CCS exhibited the prolonged radical scavenging activity which could be related to gradual CGA desorption from cationic starch microgranules.
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