Equilibrium adsorption of caffeic, chlorogenic and rosmarinic acids on cationic cross-linked starch with quaternary ammonium groups.
作者： Deimante Simanaviciute , Rima Klimaviciute , Ramune Rutkaite
DOI: 10.1016/J.IJBIOMAC.2016.12.006
关键词:
摘要: In the present study, equilibrium adsorption of caffeic acid (CA) and its derivatives, namely, chlorogenic (CGA) rosmarinic (RA) acids on cationic cross-linked starch (CCS) with degree substitution quaternary ammonium groups 0.42 have been investigated in relation to structure acidity phenolic acids. The Langmuir, Freundlich Dubinin-Radushkevich models used describe CA, CGA RA from their initial solutions having equimolar amount NaOH at different temperatures. case values parameters were closely related dissociation constants According increasing effectiveness adsorption, could be arranged following order: CA < CGA < RA, i.e. range contrary value pKa. At temperature 30 °C maximum Langmuir sorption capacity was 0.76, 1.11 2.68 mmol/g for RA, respectively. addition amounts changed properties which became mostly structure.
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