Martínez de Ilarduya, A. and Ittobane, N. and Bermúdez, M. and Alla, A. and El Idrissi, M. and Muñoz-Guerra, S. (2002) Poly(α-alkyl γ-glutamate)s of microbial origin. 2. On the microstructure and crystal structure of poly(α-ethyl γ-glutamate)s. Biomacromolecules, 3 (5). pp. 1078-1086.

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Abstract

The stereochemical microstructure and crystalline structure of nearly racemic poly(α-ethyl γ,DL-glutamate) obtained by esterification of biosynthetic poly(γ-glutamic acid) were examined by NMR, DSC, and powder X-ray diffraction. The two enantiomerically pure poly(α-ethyl γ-glutamate)s, as well as the racemic stereocopolymers with random and alternating microstructure, were prepared by chemical synthesis and studied in parallel to help in the interpretation of the data. The 13C NMR analysis revealed that biosynthetic poly(α-ethyl γ,DL-glutamate) consists of a block stereocopolymer accompanied by minor amounts of a mixture of the two optically pure homopolymers. The polymer is crystalline, with a degree of crystallinity and crystal structure essentially similar to those displayed by the optically pure polymers but clearly different from the alternating copolymer. Conversely, the racemic stereocopolymer with a random microstructure prepared by chemical synthesis is amorphous. The crystal structure of the racemic mixture of the D- and L-homopolymers seems to be very close to that of the biosynthetic stereocopolymer, although some indications suggesting the existence of a stereocomplex were found.

Item Type: Article
Uncontrolled Keywords: alkyl group; copolymer; crystallin; dextro glutamic acid; glutamic acid derivative; polyglutamic acid, article; biosynthesis; carbon nuclear magnetic resonance; chemical structure; controlled study; crystal structure; data analysis; enantiomer; esterification; powder; priority journal; racemic mixture; randomization; stereochemistry; synthesis; X ray diffraction; bacterium; chemistry; crystallization; differential scanning calorimetry; nuclear magnetic resonance; stereoisomerism, Bacteria; Calorimetry, Differential Scanning; Crystallization; Esterification; Molecular Structure; Nuclear Magnetic Resonance, Biomolecular; Polyglutamic Acid; Stereoisomerism; X-Ray Diffraction
Subjects: Chemical Engineering
Divisions: SCIENTIFIC PRODUCTION > Chemical Engineering
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:45
URI: http://eprints.umi.ac.ma/id/eprint/1776

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