Non-exchange sorption of amino acids from multicomponents mixtures by anion exchanger AB-17-2P (Cl)
Abstract
Consideration of sorption of substances by ion exchangers shows that non-exchange absorption is
the independent process which is of interest to a research than ionic exchange. There are enough of works
devoted to non-exchange sorption of amino acids by ion exchangers, however, there are theoretical and practical
interest to study non-exchange sorption in multicomponent systems. Identification of mutual influence
of components will allow to develop and optimize reagentless methods of separation of substances on ion
exchangers.
The sorption equilibrium in which «n» of components simultaneously involved can be described as a
set of «n» of sorption processes, independent from each other ideally. However for real processes it not so ,
therefore, accounting for the nonideal behavior of sorbed substances in multicomponent systems and to determine
the impact of components on each other are the most important issue of the theory and practice of
sorption processes.
The purpose of work was to study of regularity of non-exchange sorption of multicomponent mixtures
of amino acids by high-basic anion exchanger AV-17-2P in a Cl-form and to evaluate the influence of
amino acids properties on their sorption characteristics.
The research of non-exchange sorption of amino acids from individual solutions and their mixtures
was carried out in static conditions by method of variable concentration at 293 K from water solutions in
which the investigated amino acids are in the form of neutral particles or koinov (histidine), recharge of sorbate
and ionic exchange are excluded and non-exchange sorption occurs. Determination of tyrosine, phenylalanine,
histidine and tryptophan in a mixture was performed by means of spectrophotometer.
It is established that the mutual influence of sorbed aromatic and heterocyclic amino acids from
mixtures in water solutions in case non-exchange sorption by anion exchanger AV-17-2P (Cl) is determined
by a certain property of the additional zwitterion - size factor, hydrophobicity of lateral radical, or solubility.
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