Ionic state of proline in complexes with dinonyl naphthalene sulfonic acid
Complexes of proline (Pro) with dinonyl naphthalene sulfonic acid (HD) in octane, differing on structure and content of ionic forms of amino acid, in a рН range of 1,0÷6,0, have been studied by IR-spectroscopy. On the basis of integrated intensities of absorption bands for non-dissociated carboxyl group and carboxylate ion, the content of cationic and zwitterionic forms of Pro in the extractant phase has been calculated.