Produção biotecnológica de poli-hidroxialcanoatos para a geração de polímeros biodegradáveis no Brasil

Silva, Luiziana Ferreira da; Gomez, José Gregório Cabrera; Rocha, Rafael Costa Santos; Taciro, Marilda Keico; Pradella, José Geraldo da Cruz

doi:10.1590/s0100-40422007000700040

Cited by 49 publications

(62 citation statements)

References 40 publications

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“…These bacteria can be found in a variety of environments, in soil, water, sewer microbiologically treated [40] and even of mangrove [15]. Some of the most known species of PHB bacteria are: Ralstonia eutropha [41] (nowadays Cupriavidus necator [42]), Escherichia coli [9], Burkholderia cepacia and Zobellela denitrificans [15], Bacillus megaterium and Pseudomonas oleovorans [26], Protomonas extorquens, Protomonas oleovorans, Alcaligenes latus and Azobacter vinelandii [43]. These bacteria can be divided into two groups according to the composition of the culture medium necessary for the synthesis of PHB.…”

Section: Phb Synthesismentioning

confidence: 99%

From Obtaining to Degradation of PHB:Material Properties. Part I

et al. 2017

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This paper presents a review of the chemical, physical and morphological characteristics, as well as the existing applications and mechanisms for the production of poly (3-hydroxybutyrate). This biopolymer, which is obtained from renewable sources, degrades when exposed in biologically active environments and is biocompatible, that is, it is not rejected by the human body in health applications. However, in spite of presenting similar properties with some conventional plastics, the PHB exhibits fragile behavior and thermal instability when processed. The literature proposes the use of blends, the development of copolymers or the insertion of additives in an attempt to improve the mechanical and thermal properties of PHB. Key words: Biopolymers; polyhydroxyalkanoates (PHA); Polyhydroxybutyrate (PHB). Universidad EAFIT 269|From Obtaining to Degradation of PHB: Material Properties. Part I De la obtención a la degradación de PHB: Propiedades del material. Parte I ResumenEste artículo presenta una revisión de las características químicas, físicas y morfológicas, así como las aplicaciones y mecanismos existentes para la producción de poli(3-hidroxibutirato). Este biopolímero, que se obtiene a partir de fuentes renovables, se degrada cuando se expone en ambientes biológicamente activos y es biocompatible, es decir, no es rechazado por el cuerpo humano en aplicaciones de salud. Sin embargo, a pesar de presentar propiedades similares con algunos plásticos convencionales, el PHB exhibe comportamiento frágil e inestabilidad térmica cuando se procesa. La literatura propone el uso de mezclas, el desarrollo de copolímeros o la inserción de aditivos en un intento por mejorar las propiedades mecánicas y térmicas del PHB.Palabras clave: Biopolímeros; degradación de PHB; polihidroxialcanoato (PHA); polihidroxibutirato (PHB).

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Section: Phb Synthesismentioning

confidence: 99%

From Obtaining to Degradation of PHB:Material Properties. Part I

et al. 2017

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“…The inappropriate disposal of these materials is a cause for concern due to the following main characteristics: they are resistant to microbial degradation due to their hydrophobicity and high molecular weight [4][5][6] . To reduce the impacts of these recalcitrant materials in the environment, researchers are investigating some alternatives, as for example, the production of more degradable polymers, such as the biodegradable and oxo-biodegradable polymers which are less damaging to the environment and production blends composed of synthetic and biodegradable polymers [6,7] . Oxo-biodegradable polymers are synthetic polymers mixed with organic salts (stearate, carbamate) of metals such as cobalt, manganese, iron, etc [8] .…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of additive PHBV/PP-co-PE films buried in soil

et al. 2016

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SbstractThere is considerable concern about the impact plastic materials have on the environment due to their durability and resistance to degradation. The use of pro-oxidant additives in the polymer films could be a viable way to decrease the harmful effects of these discarded materials. In this study, films of PHBV/PP-co-PE (80/20 w/w) and PHBV/PP-co-PE/add (80/19/1 w/w/w) (with pro-oxidant additive) were employed to verify the influence of the additive on the biodegradation of these films in the soil. These films were obtained by melting the pellets in a press at 180 °C which were buried in soil columns for 3 and 6 months. Some samples were also heated before being buried in soil. The biodegradation is higher for the additive blend buried for 3 months than for the pre-heated blend. After 6 months the blend buried and heated/buried was completely degraded in soil. The effect of the additive, on chain oxidation, is more time-dependant than heat-dependant.

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“…podem ser manipuladas variando a composição de HB e HV. Essas vantagens tornam os copolímeros de PHBHV mais adequados do que os homopolímeros de PHB para muitas aplicações [6][7][8][9] . A estrutura do PHBHV é mostrada na Figura 1.…”

Section: Introductionunclassified

Estudo cinético da redução da massa molar do poli(3-hidroxibutirato-co-3-hidroxivalerato) (PHBHV)

et al. 2010

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Resumo: Neste trabalho foi realizado um estudo cinético da redução da massa molar do poli(3-hidroxibutirato-co-3-hidroxivalerato) (PHBHV) em três diferentes metodologias: hidrólise ácida com ácido clorídrico, transesterificação com hexilenoglicol ou etilenoglicol e redução na presença do borohidreto de sódio (NaBH 4 ). Foram investigados os parâmetros de processo: tempo, temperatura, tipo e concentração de catalisadores. Os resultados de redução de massa molar foram analisados pelo modelo cinético de ordem n. A redução com NaBH 4 foi mais eficiente do ponto de vista cinético, tendo em vista os parâmetros: constante de reação k e energia de ativação (E a ), uma vez que os valores observados foram significativamente maiores em comparação com os calculados para os demais métodos. Palavras-chave: Polihidroxialcanoatos, PHBHV, redução da massa molar, análise cinética. Kinetic Study of the Molecular Weight Reduction of Poly (3-Hydroxybutirate-co-3-Hydroxyvalerate) (PHBHV)Abstract: In this work a kinetic study was carried out of the molecular weight reduction of poly(3-hydroxybutirate-co-3-hydroxyvalerate) (PHBHV) in three different methodologies: acid hydrolysis using hydrochloric acid, transesterification with ethylene glycol or hexylene glycol and reduction in the presence of sodium borohydride (NaBH 4 ). The following process parameters were investigated: time, temperature, type and concentration of catalysts. The results of molecular weight reduction were fitted with a n-order kinetic model. The kinetics analysis has shown that the NaBH 4 reduction was the most efficient in terms of reaction rate in comparison with the other methods.

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Produção biotecnológica de poli-hidroxialcanoatos para a geração de polímeros biodegradáveis no Brasil

Cited by 49 publications

References 40 publications

From Obtaining to Degradation of PHB:Material Properties. Part I

From Obtaining to Degradation of PHB:Material Properties. Part I

Biodegradation of additive PHBV/PP-co-PE films buried in soil

Estudo cinético da redução da massa molar do poli(3-hidroxibutirato-co-3-hidroxivalerato) (PHBHV)

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