Evaluation of some physico-chemical characteristics of FIBAN A-1 and A-5 ion-exchange fibers as tryptophan sorbents from aqueous solutions
Abstract
The work is devoted to the study of samples of fibrous ion–exchange materials of the FIBAN brand as sorbents of the heteroaromatic amino acid tryptophan from aqueous solutions. For a preliminary assessment of the acid-base properties of the sorbents FIBAN A-1 and A-5, their potentiometric titration was carried out by the method of separate weighed portions at the ionic strength of the solution 0.1 M. The total number of ionogenic groups and the number of amino groups differing in their basicity are calculated. By solving the Henderson-Hasselbach equation, the apparent basicity constants of the functional groups of the fibers under study are calculated graphically.
The possibility of using FIBAN A-5 and A-1 fibers for the extraction of heteroaromatic amino acids from aqueous solutions is evaluated using the sample of β-indolylaminopropionic acid (tryptophan, Trp).
It is noted that, in relation to tryptophan, the most effective sorbent is the strong basic anion exchanger FIBAN A-1, which provides participation in the absorption of amino acids not only of functional groups, but also partially of the sorbent matrix. The study of the amount of sorbed sorbtive at different temperatures (293 and 323 K) indicates an endothermic character of sorption – an increase in temperature increases the degree of Trp extraction by the studied fibers.
The paper evaluates the hydration properties of sorbents before and after sorption of a heteroaromatic amino acid. Dehydration of sorbents after tryptophan sorption was noted. According to the analysis of the isotherms of water vapor sorption by ion exchanger samples, this phenomenon is associated with a decrease in the amount of "free" water in the sorbent matrix.
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