The interaction of methionine with mono - and bifunctional carboxyl ion exchangers in a copper form
Abstract
For establishment of possibility of division of amino acids and ions of metals on carboxylic ion
exchangers it is necessary to find out competitiveness of functional groups of sorbents in relation to ions of
amino acids. With the help of sorption, spectroscopic and calorimetric methods in work studied interaction of
ions of methionine with carboxylic cation exchangers KB-2 and KB-4 and an iminodiacetate polyampholyte
ANKB-35 in copper forms. Amino acid sorption isotherms by copper forms mono - and bifunctional ion
exchangers from water solutions with рН 2.0, 5.5 and 11.0 are received; IR-spectrums of ion exchangers in a
copper form and sated with methionine in various environments and enthalpies of sorption at 298 K are
received; limit capacities of sorbents and coefficients of distribution of methionine between carboxyl pitches
and solutions of various acidity are calculated. It is established that the hydrogen indicator of the
environment plays the defining role in change of the nature of interaction between solution of methionine and
an ion exchanger in a copper form. At рН 2.0 and 5.5 there is a destruction of an ionite complex on the ionexchange
mechanism to eluating of cations of copper(II) in solution. At рН 11.0 in the presence of a
coordination and nonsaturated form of an ion exchanger mixed ligand complexes in a phase of sorbents are
formed: KB-2 and KB-4 at low concentration of methionine, ANKB-35 – in a wide interval of extents of
filling. The coefficient of distribution of amino acid between the carboxylic cation exchanger and water
solution has the maximum value at рН 10.
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References
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