Results 141 to 150 of about 30,247 (183)

Poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate)-based biopolymer systems

Biochemistry (Moscow) Supplement Series B: Biomedical Chemistry, 2011
Biodegradable biopolymers attract much attention in biology and medicine due to its wide application. The present review considers a biodegradable and biocompatible polymer of bacterial origin, poly(3-hydroxybutyrate), which has wide perspectives in medicine and pharmaceutics.
A. P. Bonartsev, G. A. Bonartseva, K. V. Shaitan, M. P. Kirpichnikov   +3 more
openaire   +1 more source

Anaerobic degradation of poly-3-hydroxybutyrate and poly-3-hydroxybutyrate-co-3-hydroxyvalerate

Biodegradation, 1997
The anaerobic degradation of the polyesters poly-3-hydroxybutyrate (PHB) and poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) was investigated with special regard to intermediate products, kinetics, and yields. During the degradation of PHBV acetate, propionate, n-butyrate, and n-valerate were detected.
A, Reischwitz, E, Stoppok, K, Buchholz
openaire   +2 more sources

Degradation of poly(3-hydroxybutyrate) by poly(3-hydroxybutyrate) depolymerase from Alcaligenes faecalis T1

Biochimica et Biophysica Acta (BBA) - General Subjects, 1986
The extracellular poly(3-hydroxybutyrate) depolymerase purified from Alcaligenes faecalis T1 has two disulfide bonds, one of which appears to be necessary for the full enzyme activity. This depolymerase hydrolyzed not only hydrophobic poly(3-hydroxybutyrate) but also water-soluble trimer and larger oligomers of D-(-)-3-hydroxybutyrate, regardless of ...
Y, Shirakura, T, Fukui, T, Saito, Y, Okamoto, T, Narikawa, K, Koide, K, Tomita, T, Takemasa, S, Masamune   +8 more
openaire   +2 more sources

Poly(3-hydroxybutyrate) Granule-Associated Proteins:  Impacts on Poly(3-hydroxybutyrate) Synthesis and Degradation

Biomacromolecules, 2005
Polyhydroxyalkanoates (PHAs) represent a group of biopolymers that are synthesized by many bacteria as storage compounds and deposited as insoluble cytoplasmic inclusions. Because they have many putative technical and medical applications, PHAs may play an important role in human life in the future.
Markus, Pötter, Alexander, Steinbüchel
openaire   +2 more sources

Enzymatic degradation of poly(3-hydroxybutyrate)-based blends: poly(3-hydroxybutyrate)/poly(ethylene oxide) blend

Polymer Degradation and Stability, 1992
Abstract The compatibility and biodegradability of a blend of poly(3-hydroxybutyrate) (PHB) and poly(ethylene oxide) (PEO) were studied by analysis of differential scanning calorimetry and enzymatic degradation. The PHB/PEO blend exhibited a single glass-transition temperature (Tg) and the Tg values depended upon the blend composition, which ...
Y.Kumagai, Y.Doi
openaire   +1 more source

Phase behavior of poly(3-hydroxybutyrate)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) blends

Fluid Phase Equilibria, 2007
Miscibility, molecular interactions and crystallinity of blends of poly(3-hydroxybutyrate) [P(3HB)] with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] were studied in this work. P(3HB)/P(3HB-co-3HV)-6%3HV blends were prepared by casting and characterized by differential scanning calorimetry (DSC) and X-ray diffraction (XRD).
Denise Santos Conti, Maria Irene Yoshida, Sérgio Henrique Pezzin, Luiz Antônio Ferreira Coelho   +3 more
openaire   +1 more source

Poly-3-hydroxybutyrate production byAzotobacter chroococcum

Folia Microbiologica, 2001
Thirty-seven soil isolates and mutants of Azotobacter chroococcum tested for poly-3-hydroxybutyrate (PHB) production using Sudan black B staining method were found to be positive. One mutant showed a higher number of PHB-producing cells and maximum number of granules per cell. Using 2% glucose and 15 mmol/L ammonium acetate, PHB production was found to
J, Parshad, S, Suneja, K, Kukreja, K, Lakshminarayana   +3 more
openaire   +2 more sources

Biodegradable Poly(3‐hydroxybutyrate) Nanocomposite

Macromolecular Symposia, 2009
AbstractThis work seeks bringing a technological and social contribution by searching blends and composites of poly(3‐hydroxybutyrate) (PHB) and polyethylene widely used in packaging films, and colloidal silica. The mixtures were prepared by extrusion using a single‐screw extruder and were analyzed regarding their thermal and mechanical properties and ...
Eiji Ohashi, Walker Soares Drumond, Nicholas Picoli Zane, Pedro Wang de Faria Barros, Marly Grinapel Lachtermacher, Hélio Wiebeck, Shu Hui Wang   +6 more
openaire   +1 more source

Photodegradation of poly(3-hydroxybutyrate)

Polymer Degradation and Stability, 2010
Abstract The effect of ultraviolet radiation on the properties of poly(3-hydroxybutyrate) (PHB) was studied. The PHB investigated is produced from microbial fermentation using saccharose from sugarcane as the carbon source to the bacteria. The material was exposed to artificial UV-A radiation for 3, 6, 9 and 12 weeks.
Roberta K. Sadi, Guilhermino J.M. Fechine, Nicole R. Demarquette   +2 more
openaire   +1 more source

Miscibility and crystallinity of poly(3-hydroxybutyrate)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) blends

Thermochimica Acta, 2006
Abstract With the objective of developing new biodegradable materials, the miscibility and the crystallinity of blends of poly(3-hydroxybutyrate), P(3HB), and poly(3-hydroxybutyrate-co-3-hydroxyvalerate), P(3HB-co-3HV), have been studied. P(3HB) (300 kg mol−1)/P(3HB-co-3HV)–10% 3HV (340 kg mol−1) blends were prepared by casting in a wide range of ...
D.S. Conti, M.I. Yoshida, S.H. Pezzin, L.A.F. Coelho   +3 more
openaire   +1 more source