Results 201 to 210 of about 116,724,214 (245)

Ecofriendly poly(3-hydroxybutyrate-co-4-hydroxybutyrate) microbeads for sanitary products

International Journal of Biological Macromolecules, 2023
In the past, plastic microbeads (MBs) were added to personal healthcare products to improve the cleaning and exfoliating effects, but these have been withdrawn owing to their non-degradable nature and contribution to the pollution of marine environment, especially that caused by the adsorption of persistent organic pollutants (POPs) on MBs.
Yun Hyeok, Choi, Jeong Jin, Park, Eun Jung, Sim, Eunhye, Lee, Ki Chull, Yoon, Won Ho, Park   +5 more
openaire   +2 more sources

Biosynthesis and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) in Alcaligenes eutrophus

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
openaire   +2 more sources

Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) formation fromγ-aminobutyrate and glutamate

Biotechnology and Bioengineering, 2000
To 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
openaire   +2 more sources

Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by Alcaligenes latus

Biotechnology Letters, 1993
Copolymers 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
openaire   +1 more source

Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) byPseudomonas acidovorans

Biotechnology Letters, 1992
Terpolyesters 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
openaire   +1 more source

Microbial Degradation of Poly(3-Hydroxybutyrate-co-4-Hydroxybutyrate) in Soil

Journal of Polymers and the Environment, 2011
The 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
openaire   +1 more source

Microbial Synthesis and Properties of Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)

Polymer International, 1996
Microbial synthesis of copolymers of [R]-3-hydroxybutyrate (3HB) and 4-hydroxybutyrate (4HB), P(3HB-co-4HB), by Alcaligenes eutrophus, Alcaligenes latus, and Comamonas acidovorans from various carbon sources has been studied. The copolyester compositions varied from 0 to 100 mol% 4HB, depending on the microorganism and the combination of carbon ...
Y. Saito, S. Nakamura, M. Hiramitsu, Y. Doi   +3 more
openaire   +1 more source

Biosynthesis and biocompatibility of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)

Polymer Degradation and Stability, 2010
Abstract 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, Ketsunee Buasri, Aumtiga Muangwong, Phonpisit Utiswannakul   +3 more
openaire   +1 more source

Microbial synthesis and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)

Macromolecules, 1992
Copolyesters 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
openaire   +1 more source

The Compatibility of Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and Thermoplastic Polyurethane Blends

Advanced Materials Research, 2013
Thermoplastic polyurethane (TPU) has been used to toughen Poly (3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) and increase its cold-resistance. The compatibility of P34HB/TPU blends was predicted by solubility parameter, then investigated by appearance and transparence, Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscopy (SEM) analysis.
Xi Ming Sun, Lu Hua Zhong, Xiao Ping Lan, Guan Yue Tan   +3 more
openaire   +1 more source