| Poly(alpha-alkyl gamma-glutamate)s of microbial origin. 2. On the microstructure and crystal structure of poly(alpha-ethyl gamma-glutamate)s. | |
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MedLine Citation:
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PMID: 12217056 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The stereochemical microstructure and crystalline structure of nearly racemic poly(alpha-ethyl gamma,DL-glutamate) obtained by esterification of biosynthetic poly(gamma-glutamic acid) were examined by NMR, DSC, and powder X-ray diffraction. The two enantiomerically pure poly(alpha-ethyl gamma-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 (13)C NMR analysis revealed that biosynthetic poly(alpha-ethyl gamma,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. |
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Authors:
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Antxon Martínez de Ilarduya; Najim Ittobane; Marta Bermúdez; Abdelilah Alla; Mustafa El Idrissi; Sebastián Muñoz-Guerra |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biomacromolecules Volume: 3 ISSN: 1525-7797 ISO Abbreviation: Biomacromolecules Publication Date: 2002 Sep-Oct |
Date Detail:
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Created Date: 2002-09-09 Completed Date: 2003-07-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: United States |
Other Details:
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Languages: eng Pagination: 1078-86 Citation Subset: IM |
Affiliation:
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Departament d'Enginyería Química, Universitat Politécnica de Catalunya E.T.S. d'Enginyers Industrials de Barcelona, Diagonal 647, 08028 Barcelona, Spain. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria
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chemistry Calorimetry, Differential Scanning Crystallization Esterification Molecular Structure Nuclear Magnetic Resonance, Biomolecular Polyglutamic Acid / chemistry* Stereoisomerism X-Ray Diffraction |
| Chemical | |
Reg. No./Substance:
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25513-46-6/Polyglutamic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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