Poly hydroxy butyrate

Biosynthesis of Poly (3-hydroxy butyrate-co-3-hydroxyalkanoates) by Metabolically Engineered Escherichia coli Strains... [Pg.335]

T7177>. Ring-opening polymerization can proceed by two mechanisms depending on the initiator used the coordination-insertion mechanism or the anionic mechanism. While most studies focused on the synthesis of poly(/3-hydroxy butyrate), alternative PHAs were synthesized from a-methyl-/3-pentyl-/3-propiolactone... [Pg.359]

Avella, M. Matuscelli, E. Raimo, M. Properties of blends and composites based on poly(3-hydroxy)butyrate (PHB) and poly(3-hydroxybutyrate-hydroxyvalerate) (PHBV) copolymers. J. Mater. Sci. 2000, 35, 523-545. [Pg.85]

The dependence of CD-IC formation from solution for polymers with different stereosequences was investigated for isotactic (i) and atactic (a) poly(3-hydroxy-butyrates) (i-PHB and a-PHB) [26], i-PHB was found to form an IC with a-CD, but not with 0- or y-CDs, while only y-CD formed an IC with a-PHB. From these observations it was concluded that extended conformations available to i-PHB were too narrow, thin for a tight-packing fit with 0- or y-CDs, while the much wider, thicker extended conformations available to a-PHB chains precluded their inclusion in the narrower a- and 3-CDs, but fit tightly in the more spacious channels of its IC formed with y-CD. [Pg.120]

The distinct changes in morphology achieved by melt-crystallization of polymers in the presence of small amounts of their (n-s) polymer-CD-ICs results in changes in other physical properties as well. For example, in Table 2 a comparison of the properties of poly(3-hydroxy butyrate) (PHB) melt-spun with and without the presence of (n-s) PHB-a-CD-IC are compared [104], The mechanical properties of the PHB/( -s) PHB-a-CD-IC fibers are superior. In fact, their lower elongation at break likely contributes to the removal of the stickiness normally observed between melt-spun PBH fibers [104],... [Pg.141]

Synthetic or man-made, e.g., PVAl, CA, polylactams e.g., polycaprolactam), polyglycols (e.g., polyethylene glycol), poly(aspartic acid), poly(butylene succinate-co-adipate), as well as poly(3-hydroxy butyrate) or PHB, poly(P-hydroxybutyric acid) or PHBA, poly(hydroxy-valerate) or PHV, poly(lactic acid) or PLA, polyCglycolic acid), polyglycolides, polybu-tyric acid, their copolymers and mixtures. [Pg.1152]

Biodegradable, aliphatic polyesters can be synthesized or produced by bacteria and cyanobacteria. These organisms accumulate poly(3-hydroxy butyrate) (PHB) up to 80 wt% of the dry cellular material. Long branching has been produced by modifying the culture medium [Ramsay et ah, 1991]. PHB is degraded by the enzyme poly(3-hydroxybutyrate depolymerase). [Pg.1155]

Poly(D(-)-3-hydroxybutyrate miscibility has been reported with polyvinylacetate (PVAC) [Greco and Martuscelli, 1989], poly(p-vinyl phenol) [Xing et al., 1997], and polyethylene-oxide (PEG) [Avella and Martuscelli, 1988]. Phase separation of poly(3-hydroxy butyrate-co-... [Pg.1186]

Poly(3-hydroxy butyric acid) and poly(3-hydroxyl valeric acid) copolymers are formed by the fermentation of glucose with the aid of Alcaligenes eutrophus species. As a result of using copolymers, PHBV is synthesised via polymerisation (Figure 5.3). [Pg.121]

Coskun, S. Korkusuz, F. and Hasirci, V. Hydroxyapatite reinforced poly(3-hydroxy-butyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvaleiate) based degradable composite bone plate. J. Biomater. Sci. Polym. Edn. 2005,16(12), 1485-1502. [Pg.38]

Ostwald, J. Dommerich, S. Nischan, C. andKiamp, B. [In vitro culture of cells from respiratory mucosa on foils of coUagen, poly-L-lactide (PLLA) and poly-3-hydroxy-butyrate (PHB)]. Latyngorhinootol. 2003,82(10), 693-699, [Article in Germany]. [Pg.41]

Gursel, L and Hasirci, V. Properties and drug release behaviour of poly(3-hydroxy-butyric acid) and various poly(3-hydroxybutyrate-hydroxyvalerate) copolymer microcapsules. J. M croewca/jsw/., 1995,12(2), 185-193. [Pg.44]

Livshits, V. A. et al. Microspheres based on poly(3-hydroxy )butyrate for prolonged drug release. Polym. Sci. Series B. 2009, 51(7-8), 256-263. [Pg.46]

Bacterial polyesters (polyhydroxy alkanoates) Poly(3-hydroxy butyrate), poly(3-hydroxy valerate) Some micro-organisms, especially bacteria, can synthesise biocompatible aliphatic polyesters, which have potential in medical applications. [Pg.79]

Degradable, synthetic polymers that are commonly known in the medical field include poly(a-hydroxy esters), poly(fi-caprolactone), poly(ortho esters), polyanhydrides, poly(3-hydroxy butyrate), polypho-sphazenes, polydioxanones, polyoxalates, and poly(amino acids). [Pg.622]

Lee SY, Choi JI (1998) Effect of fermentation performance on the economics of poly(3-hydroxy-butyrate) production by Alcaligenes latus. Polym Degrad Stab 59 387-393 Lee SY, Choi J, Wong HH (1999) Recent advances in polyhydroxyalkanoate production by bacterial fermentation mini-review. Int J Biol Macromol 25 31-36 Lee SY, Lee KM, Chan HN, Steinbiichel A (1994) Comparison of recombinant Escherichia coli strains for synthesis and accumulation of poly(3-hydroxybutyric acid) and morphological changes. Biotechnol Bioeng 44 1337-1347... [Pg.116]

Suwantong O, Waleetomcheepsawat S, Sanchavanakit N, Pavasant P, Cheepsunthom P, Bunaprasert T, Supaphol P (2007) In vitro biocompatibility of electrospun poly(3-hydroxy-butyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) fiber mats. Int 1 Biol Macromol 40 217-223... [Pg.125]

Poly (3 -hydroxy butyrate) Poly(alpha-hydroxy esters)... [Pg.1079]

Madden L.A. and Andrason, A.J., 1998, Synthesis and characterization of poly(3-hydroxy-butyrate and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymer mixtures produced in high-density fed-batch cultures of Ralstonia eutropha Alcaligenes eutrophus). Macromolecules 31 5660... [Pg.124]

Anderson AJ, Dawes EA (1990) Occurrence, metabolism, metabolic role, and industrial uses of bacterial polyhydroxyalkanoates. Microbiol Rev 54 450 72 Aneja P, Dai M, Lacorre DA, PUlon B, Charles TC (2004) Heterologous complementation of the exopolysaccharide synthesis and carbon utilization phenotypes of Sinorhizobium meliloti Rml021 polyhydroxyalkanoate synthesis mutants. FEMS Microbiol Lett 39 277-283 Arora NK, Singhal V, Maheshwari DK (2006) Salinity-induced accumulation of poly- 3-hydroxy-butyrate in rhizobia indicating its role in cell protection. World J Microbiol Biotechnol 22 603-606... [Pg.56]

Lopez Nl, Eloccaii ME, Garcia AE, Steinbiichel A, Mendez BS (1995) Effect of poly-3-hydroxy-butyrate content on the starvation survival of bacteria in natural waters. FEMS Microbiol Ecol 16 95-102... [Pg.59]

Fukui T, Doi Y (1998) Expression and characterization of (/f)-specdlic enoyl coenzyme A hydiatase involved in polyhydroxyalkanoate biosynthesis by Aeromonas caviae. J Bacteriol 180 667-673 Fukui T, Abe H, Doi Y (2002) Engineering of Ralstonia euttopha for production of poly(3-hydroxy-butyrate-co-3-hydroxyhexanoate) from fructose and solid-state properties of the copolymer. Biomacromolecules 3 618-624... [Pg.80]

Han MJ, Park SJ, Park TJ, Lee SY (2004) Roles and applications of small heat shock proteins in the production of recombinemt proteins in Escherichia coli. Biotechnol Bioeng 88 426-436 Han MJ, Park S J, Lee JW, Min BH, Lee SY, Kim SJ, Yoo JS (2006) Analysis of poly(3-hydroxy-butyrate) granule-associated proteome in Recombinant Eicher/ch/a coli. J Microbiol Biotechnol 16 901-910... [Pg.80]

Wittmann C, Heinzle E (2001) Modeling and experimental design for metabolic flux analysis of lysine-producing Corynebacteria by mass spectrometry. Metab Eng 3 173-191 Wong MS, Causey TB, Mantzaris N, Bennett GN, San KY (2007) Engineering poly(3-hydroxy-butyrate-co-3-hydroxyvalerate) copolymer composition in E. coli. Biotechnol Bioeng 99 919-928... [Pg.84]

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