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Synthesis of 3-hydroxybutyrate-CO-4-hydroxybutyrate copolymers by hydrogen-oxidizing bacteria

Synthesis of 3-hydroxybutyrate-CO-4-hydroxybutyrate copolymers by hydrogen-oxidizing bacteria Synthesis of 3- and 4-hydroxybutyrate copolymer (3HB-co-4HB), the most promising member of the biodegradable polyhydroxyalkanoate (PHA) family, has been studied. Cultivation conditions of naturally occurring strains of hydrogen-oxidizing bacteria Ralstonia eutropha B5786 and Cupriavidus eutrophus B10646 have been optimized to ensure efficient synthesis of the 3HB-co-4HB copolymer. A set of highly pure samples of the 3HB-co-4HB copolymer with 4HB content varying from 8.7 to 24.3 mol% has been obtained. Incorporation of 4HB into the copolymer was shown to cause a more pronounced decrease in polymer crystallinity than the incorporation of 3-hydroxyvalerate or 3-hydroxyhexanoate; samples with a degree of crystallinity below 30% have been obtained. The weight average molecular mass of the 3HB-co-4HB copolymers was shown to be independent on the monomer ratio and to vary broadly (from 540 to 1110 kDa). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Biochemistry and Microbiology Springer Journals

Synthesis of 3-hydroxybutyrate-CO-4-hydroxybutyrate copolymers by hydrogen-oxidizing bacteria

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References (26)

Publisher
Springer Journals
Copyright
Copyright © 2010 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Microbiology; Medical Microbiology; Biochemistry, general
ISSN
0003-6838
eISSN
1608-3024
DOI
10.1134/S0003683811050152
Publisher site
See Article on Publisher Site

Abstract

Synthesis of 3- and 4-hydroxybutyrate copolymer (3HB-co-4HB), the most promising member of the biodegradable polyhydroxyalkanoate (PHA) family, has been studied. Cultivation conditions of naturally occurring strains of hydrogen-oxidizing bacteria Ralstonia eutropha B5786 and Cupriavidus eutrophus B10646 have been optimized to ensure efficient synthesis of the 3HB-co-4HB copolymer. A set of highly pure samples of the 3HB-co-4HB copolymer with 4HB content varying from 8.7 to 24.3 mol% has been obtained. Incorporation of 4HB into the copolymer was shown to cause a more pronounced decrease in polymer crystallinity than the incorporation of 3-hydroxyvalerate or 3-hydroxyhexanoate; samples with a degree of crystallinity below 30% have been obtained. The weight average molecular mass of the 3HB-co-4HB copolymers was shown to be independent on the monomer ratio and to vary broadly (from 540 to 1110 kDa).

Journal

Applied Biochemistry and MicrobiologySpringer Journals

Published: Sep 7, 2011

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