Degradation of commercially important polyhydroxyalkanoates in tropical mangrove ecosystem

Sridewi, Nanthini; Bhubalan, Kesaven; Sudesh, Kumar

doi:10.1016/j.polymdegradstab.2006.08.027

Cited by 117 publications

(65 citation statements)

References 25 publications

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“…There are few parameters such as monomeric composition and crystallinity of the PHA that can be included to evaluate the degradation rate of PHA (Sridewi et al, 2006). Zhenguo Li and co-workers suggested that enzymatic degradation of PHA is based on the length of the side chain of PHA, which implies that the longer side chains provide better degradability .…”

Section: Extracellular Degradationmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of Polyhydroxyalkanoate (PHA): a Review

Ong¹,

Chee²,

Sudesh³

2017

J. Sib. Fed. Univ., Biol.

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Section: Extracellular Degradationmentioning

confidence: 99%

“…This higher degradation capability is attributed to the surface morphology of copolymers which combines low crystallinity and porous surface (Wang et al, 2004;Sridewi et al, 2006).…”

Section: Extracellular Degradationmentioning

confidence: 99%

Degradation of Polyhydroxyalkanoate (PHA): a Review

Ong¹,

Chee²,

Sudesh³

2017

J. Sib. Fed. Univ., Biol.

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“…Os polímeros obtidos a partir deste material podem ter composição e distribuição de comonômeros mais controlada em relação à transesterificação direta [6] . Lauzier et al [17] estudaram a redução da massa molar do PHB via hidrólise ácida em meio drão.…”

Section: Solventes E Reagentesunclassified

“…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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“…It is less brittle than its homopolymer, PHB (poly (3-hydroxybutyrate) [17] and its physical and thermal properties depends on the content of hydroxyvalerate units (HV) [18] . Biodegradation experiments were performed with this polymer and the researchers observed that degradation of the samples occurred in just 4 weeks [19] .…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of films of low density polyethylene (LDPE), poly(hydroxibutyrate-co-valerate) (PHBV), and LDPE/PHBV (70/30) blend with Paecilomyces variotii

2015

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SbstractThe increased consumption of plastics in the world has been a subject of great concern and special attention by the scientific community. The aim is to promote development of materials that are biodegradable in a shorter time upon disposal in the environment. The most used synthetic plastics are difficult to biodegrade because they are made of long hydrocarbon chains, such as polyethylene (PE), polypropylene (PP), poly(vinyl chloride) (PVC), which are hydrophobic and resistant to the action of microbial enzymes. The use of alternative materials (natural polyesters) can minimize the harm to dumps and landfills upon their disposal, because they are susceptible to the action of microorganisms. In this study we evaluated the biodegradation/biodeterioration of PHBV (poly(3-hydroxybutyrate-co-hydroxyvalerate) films, LDPE (low density polyethylene) and the blend of LDPE/PHBV (70/30) by the fungus Paecilomyces variotii, using different methods: optical microscopy (OM), scanning electronic microscopy (SEM) and Fourier Transform Infrared spectroscopy (FTIR).

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Degradation of commercially important polyhydroxyalkanoates in tropical mangrove ecosystem

Cited by 117 publications

References 25 publications

Degradation of Polyhydroxyalkanoate (PHA): a Review

Degradation of Polyhydroxyalkanoate (PHA): a Review

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

Biodegradation of films of low density polyethylene (LDPE), poly(hydroxibutyrate-co-valerate) (PHBV), and LDPE/PHBV (70/30) blend with Paecilomyces variotii

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