The differentiating effect of solventat nonexchangeablesorption of amino acids ion exchangers
Abstract
At not exchange of non-exchange sorption of substances by ion exchangers of the same nature, the acting forces are the same, which complicates the separation of multicomponent mixtures. Regulation of dominant interactions in sorption systems by changing the conditions of the process will allow more efficient separation of substances without the use of additional electrolytes. It’s known that solvent plays an important role in many physical and chemical processes, especially on the phase boundary, therefore the purpose of work was identification of patterns of non-exchange sorption of glycine and tryptophan from hudroalcoholic solutions with different ratios of components in the solvent anion exchange АV-17-2P (Сl).
We used the simplest amino acid, not having the side of the radical (glycine), and the hydrophobic amino acid (tryptophan) and the high basic anion exchanger АV-17-2P in the Cl-form, having as functional groups Quaternary nitrogen. The properties of hudroalcoholic solutions of amino acids, anion exchanger and the equilibrium of non-exchange sorption at different ethyl alcohol content in the solvent were investigated (0, 25, 40, 50, 60, 75, 100 % by volume). It is established that the properties of hudroalcoholic solutions of amino acids (tryptophan and glycine) and ion exchanger AV-17-2P (Cl) are determined by the ratio of water and ethyl alcohol in the solvent, as well as the presence of polar and hydrophobic parts in the structure of the
objects of study.The change in the properties of the sorbent and the sorbates under study depending on the content of the organic component in the solution is nonmonotonic: the swelling of the anion exchanger is minimal at 75% alc, and the solubility of tryptophan is maximum at 40% alc, which, however, isn’t observed for glycine. It is revealed, that non-exchange sorption of amino acids by anion exchangerАV-17-2P from hudroalcoholic solutions also is nonmonotonic, depending on the content of organic component in the composition of the solvent - is observed the min sorption of tryptophan and the maximum sorption of glycine with a comparable content of water and alcohol in the composition of the solvent.The difference in the patter of sorption of amino acids under study is determined by the difference in their properties – the polarity of glycine and tryptophan hydrophobicity. Changing the composition of the solvent allows you to adjust the sorption characteristics in the anion exchanger-amino acid systems and separate the mixtures of zwitterlites due to the differentiating action of the solvent.
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References
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