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Thermal degradation behavior of poly[(R)-3-hydroxybutyrate-co-4-hydroxybutyrate]
Polymer Degradation and Stability, 2021Abstract The thermal degradation behavior of poly[(R)-3-hydroxybutyrate-co-16 mol%-4-hydroxybutyrate] (P(3HB-co-16 mol%-4HB)) was investigated based on spectroscopic analysis of its pyrolyzates and two kinetic modeling approaches. Pyrolyzate analysis revealed that trans-crotonic acid, cis-crotonic acid, γ-butyrolactone, and their oligomers (dimers ...
Taku Omura +5 more
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Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) formation fromγ-aminobutyrate and glutamate
Biotechnology and Bioengineering, 2000To provide 4-hydroxybutyryl-CoA for poly(3-hydroxybutyrate-co-4-hydroxybutyrate) formation from glutamate in Escherichia coli, an acetyl-CoA:4-hydroxybutyrate CoA transferase from Clostridium kluyveri, a 4-hydroxybutyrate dehydrogenase from Ralstonia eutropha, a gamma-aminobutyrate:2-ketoglutarate transaminase from Escherichia coli, and glutamate ...
H E, Valentin, S, Reiser, K J, Gruys
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Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) byPseudomonas acidovorans
Biotechnology Letters, 1992Terpolyesters of 3-hydroxybutyrate (3HB), 4-hydroxybutyrate (4HB) and 3-hydroxyvarelate (3HV) were produced byPseudomonas acidovorans in nitrogen-free culture solutions of 1,4-butanediol and pentanol. When 1,4-butanediol was used as the sole carbon source, a polyester with an unusually high 4HB fraction of 99 mol% was produced.
H.Kimura, Y.Yoshida, Y.Doi
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Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by Alcaligenes latus
Biotechnology Letters, 1993Copolymers of (R)-3-hydroxybutyrate (3HB) and 4-hydroxybutyrate (4HB) were efficiently produced by Alcaligenes latus in the culture solution containing sucrose and γ-butyrolactone. The conversion yield of γ-butyrolactone into 4HB unit of copolymer by A. latus was as high as 60%.
M.Hiramitsu, N.Koyama, Y.Doi
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Microbial Degradation of Poly(3-Hydroxybutyrate-co-4-Hydroxybutyrate) in Soil
Journal of Polymers and the Environment, 2011The microbial degradation of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3/4HB) copolymers with different 4HB molar fraction were investigated in soil for 60 days. In the degradation process, changes in weight loss and molecular weight were periodically measured to determine the biodegradability; the surface morphology also was observed using ...
Xing Wen, Xiuping Lu
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Microbial synthesis and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)
Macromolecules, 1992Copolyesters of 3-hydrorybutyrate (3HB) and 4-hydroxybutyrate (4HB) with a wide range of compositions from 0 to 100 mol % 4HB were microbially synthesized at 30°C by Alcaligenes eutrophus from 4-hydrorybutyric acid in the presence of some additives. When 4-hydrorybutyric acid, citrate, and ammonium sulfate were fed as mixed substrates in the aqueous ...
S.Nakamura, Y.Doi, M.Scandola
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Biosynthesis and biocompatibility of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)
Polymer Degradation and Stability, 2010Abstract Poly(3-hydroxybutyrate), PHB, and poly(3-hydroxybutyrate- co -4-hydroxybutyrate), P(3HB -co- 4HB), consisting of 0–94% mole fraction of 4HB content, were produced in high content by Cupriavidus necator strain A-04. The carbon sources used for PHB production included sugars made locally in Thailand: refined sugarcane, brown sugarcane, rock ...
Suchada Chanprateep +3 more
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Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by Ralstonia eutropha
Biochemical Engineering Journal, 2005Abstract Ralstonia eutropha ATCC 17699 was grown to produce poly(3-hydroxybutyrate- co -4-hydroxybutyrate) [P(3HB- co -4HB)] from fructose and γ-butyrolactone. Through flask cultures, it was found that R. eutropha cells were inhibited by high concentrations of fructose (more than 20 g/L) and γ-butyrolactone (more than 6 g/L).
Jin Seol Kim, Bong Hee Lee, Beom Soo Kim
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International Journal of Biological Macromolecules, 2021
Fused deposition modelling (FDM) is a process of additive manufacturing allowing creating of highly precise complex three-dimensional objects for a large range of applications. The principle of FDM is an extrusion of the molten filament and gradual deposition of layers and their solidification.
Kovalčík, Adriána +8 more
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Fused deposition modelling (FDM) is a process of additive manufacturing allowing creating of highly precise complex three-dimensional objects for a large range of applications. The principle of FDM is an extrusion of the molten filament and gradual deposition of layers and their solidification.
Kovalčík, Adriána +8 more
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International Journal of Biological Macromolecules, 1990
Copolyesters of 3-hydroxybutyrate (3HB) and 4-hydroxybutyrate (4HB) were produced by Alcaligenes eutrophus at 30 degrees C in nitrogen-free culture solutions containing gamma-butyrolactone alone or with fructose or butyric acid as the carbon sources. When gamma-butyrolactone was used as the sole carbon source, the 4HB fraction in copolyester increased ...
Y.Doi, A.Segawa, M.Kunioka
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Copolyesters of 3-hydroxybutyrate (3HB) and 4-hydroxybutyrate (4HB) were produced by Alcaligenes eutrophus at 30 degrees C in nitrogen-free culture solutions containing gamma-butyrolactone alone or with fructose or butyric acid as the carbon sources. When gamma-butyrolactone was used as the sole carbon source, the 4HB fraction in copolyester increased ...
Y.Doi, A.Segawa, M.Kunioka
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