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

Brew Your Own Beer

Brew Your Own Beer

Discover How To Become Your Own Brew Master, With Brew Your Own Beer. It takes more than a recipe to make a great beer. Just using the right ingredients doesn't mean your beer will taste like it was meant to. Most of the time it’s the way a beer is made and served that makes it either an exceptional beer or one that gets dumped into the nearest flower pot.

Get My Free Ebook

Post a comment