Poly 3 Hydroxybutyrate
Mostrando 25-36 de 160 artigos, teses e dissertações.
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25. EXTRAÇÃO DE POLI(3-HIDROXIBUTIRATO), PRODUZIDO POR Cupriavidus necator, COM CARBONATO DE PROPILENO
The environmental impact of plastic waste has attracted worldwide attention. Amid the current context of increasing concern for the environment, biodegradable plastics have been widely studied as a replacement for synthetic plastics. Poly(3-hydroxybutyrate) (P(3HB)) is a biopolymer stored as an intracellular energy and reserve source in many microorganisms.
Quím. Nova. Publicado em: 2015-02
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26. Maintenance-energy-dependent dynamics of growth and poly(3-hydroxybutyrate) [P(3HB)] production by Azohydromonas lata MTCC 2311 using simple and renewable carbon substrates
The dynamics of microbial growth and poly(3-hydroxybutyrate) [P(3HB)] production in growth/ non-growth phases of Azhohydromonas lata MTCC 2311 were studied using a maintenance-energy-dependent mathematical model. The values of calculated model kinetic parameters were: m s1 = 0.0005 h-1, k = 0.0965, µmax = 0.25 h-1 for glucose; m s1 = 0.003 h-1, k = 0.1229,
Braz. J. Chem. Eng.. Publicado em: 2014-06
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27. Glicólise do poli(3-hidroxibutirato) por via enzimática
Poly(3-hydroxybutyrate), PHB, is a polymer with broad potential applications because of its biodegradability and biocompatibility. However, its high crystallinity is a limiting factor for many applications. To overcome this drawback, one strategy currently employed involves the reduction of the molecular weight of PHB with the concomitant formation of end-fu
Quím. Nova. Publicado em: 2014-06
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28. Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)-based scaffolds for tissue engineering
Development and selection of an ideal scaffold is of importance for tissue engineering. Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a biocompatible bioresorbable copolymer that belongs to the polyhydroxyalkanoate family. Because of its good biocompatibility, PHBHHx has been widely used as a cell scaffold for tissue engineering. This review focu
Braz J Med Biol Res. Publicado em: 30/05/2014
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29. The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers
Poly lactic acid (PLLA) is a promising biopolymer, obtained from polymerization of lactic acid that is derived from renewable resources through fermentation. The characteristic brittleness of PLLA is attributed to slow crystallization rates, which results in the formation of the large spherulites. Its glass temperature is relative high, above room temperatur
Polímeros. Publicado em: 2014
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30. Influence of poly(ethylene grycol) - (PEG) on the properties of influence of poly(3-hydroxybutyrate-CO-3-hydroxyvalerate) - PHBV
Films of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - PHBV with polyethylene glycol (PEG) were prepared by casting solvent evaporation. The thermal behavior, morphology, crystallinity and molecular weight of these films were studied by the following techniques: differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffraction (
Polímeros. Publicado em: 11/06/2013
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31. Poly(3-hydroxybutyrate-co-3- hydroxyvalerate) nanoparticles prepared by a miniemulsion/solvent evaporation technique: effect of phbv molar mass and concentration
Miniemulsification and emulsion/solvent evaporation techniques were combined to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles. Those nanoparticles were prepared with different PHBV molar masses and PHBV concentrations to verify their effect on the final particle size. Nanoparticles with an average diameter of 133 nm were obtained
Braz. J. Chem. Eng.. Publicado em: 2013-06
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32. Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1: 1 blend nanocomposites
Melt blending of 1:1 poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and glycerol-plasticized starch (TPS) was performed in the presence of an organically-modified montmorillonite, incorporated at 2.5, 5, 7.5 and 10 wt% amounts. Scanning electron micrographs (SEM) revealed the role of the organoclay as a compatibilizing agent for the immiscible blend. Th
Polímeros. Publicado em: 28/05/2013
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33. Separación de fases y cristalinidad en mezclas epoxy/poli-3-hidroxibutirato
In this work, epoxy/poly-3-hydroxybutyrate (PHB) blends in two different proportions, 90/10 and 85/15, were studied. For this purpose, the samples were submitted to 80ºC and 120ºC for the curing process of epoxy. The phase separation and the crystallization were analyzed using optical microscopy and differential scanning calorimetry. Likewise, the lamellar
Polímeros. Publicado em: 28/05/2013
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34. Coprecipitation of safrole oxide with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in supercritical carbon dioxide
5-(Oxiran-2-ilmetil)-1,3-benzodioxol ou epóxi-safrol (SO) vem sendo estudado ao longo dos anos devido a suas propriedades dependentes da concentração, como indução à apoptose e transdiferenciação celular. A coprecipitação do SO com um polímero biodegradável e biocompatível, poli(3-hidroxibutirato-co-3-hidroxivalerato) (PHBV), foi realizada utili
J. Braz. Chem. Soc.. Publicado em: 2013-02
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35. EstratÃgias de cultivo utilizando resÃduos das indÃstrias processadoras de alimentos e Ãleo de soja para produÃÃo de Poli (3-Hidroxibutirato) / Cultivation strategies using wastes of food processing industries and soybean oil for the production Polyhidroxybutyrate
A diversidade de utilizaÃÃo de materiais polimÃricos acarreta preocupaÃÃo devido a utilizaÃÃo de fonte nÃo renovÃvel para a sua produÃÃo, bem como os problemas ambientais causados pelo acÃmulo do volume de lixo sÃlido gerado. Procurando minimizar este problema buscaram-se alternativas de produtos semelhantes aos plÃsticos de origem petroquÃmic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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36. The effect of gamma radiation on mechanical properties of biodegradable polymers poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Brazilian poly(3-hydroxybutyrate), P(3-HB), and its copolymer, poly (3-hydroxybutyrate-co-3-hydroxyvalerate), P(3-HB-co-3-HV) were irradiated with gamma radiation (60Co) at room temperature and in the presence of oxygen. The viscosity-average molar mass (Mv) was analyzed by viscometry using an Ostwald-type capillary viscometer. Both polymers showed a decreas
Mat. Res.. Publicado em: 11/12/2012