Nh O O

Some of these are quite insoluble and have been used for isolation of amino acids. Decomposition of carbamino acid occurs by boiling in aqueous solution.

L-Glu is able to react with various kind of cations, especially with metallic ions to form their corresponding specific complexes. The complex constant (log Ks) for various complexes of L-Glu is 10.3 for Ni2 + , 8.5 for Zn2 + , 8.1 for Co2 + , 4.8 for Fe2 + , and 3.0 for Mn2+ (19). Glutamic acid reacted with sodium ion to form monosodium L-glutamate, on the other hand, reacts as a base with sulfuric acid to form diglutamate sulfate crystals.

Infrared Spectra

Comparison of the infrared (IR) spectra of L-Glu, L-GluHCl, and L-GluNa H2O are shown in Figure 3 (20). The IR spectra of L-Glu shows strong bands at 1,820 and 1,420 cm-1, which correspond to the COO; these are 1,880 cm-1 for COOH and 2,740 cm-1 for NH+, respectively. The spectra of L-Glu HCl, on the other hand, does not show bands at 1,820 and 1,420 cm-1 for COO- and that of L-Glu NaH2O does not show the band at 1,870 cm-1 for COOH, but does show a strong band at 1,820 and 1,420 cm-1 for COO-.

Ionic Forms

The four ionic forms of L-Glu exist depending on the pH of the solution. The dipolar nature of amino acids in solution has been shown by Raman spectroscopy. The Raman spectra of L-Glu shows a strong line at 1730 cm-1, which corresponds to the C=O vibration. The spectrum of sodium L-Glu-, on the other hand, does not show this frequency because the salt is completely dissociated and its structure represented is by the resonant forms

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