Evaluation of enzymatic degradation based on the quantification of glucose in thermoplastic starch and its characterization by mechanical and morphological properties and NMR measurements

Rosa, Derval dos Santos; Carvalho, C. L. de; Gaboardi, F.; Rezende, M.L.; Tavares, Maria Inês Bruno; Petro, Miroslav; Calil, M.R.

doi:10.1016/j.polymertesting.2008.06.008

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…It was further reported that blending of PVC by PVA enhances the biodegradability of the polymer [14]. In another study about 3% reduction in the molar mass of pPVC (DOP) was observed after 3-month soil burial experiment [15]. The microorganism adherence brings some structural changes in PCL and PVC plastics having more carbonyl groups observed by UV-Vis spectrometer [16].…”

Section: Introductionmentioning

confidence: 86%

Isolation and molecular characterization of polyvinyl chloride (PVC) plastic degrading fungal isolates

Ali

Ahmed

Robson

et al. 2013

J. Basic Microbiol.

152

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The recalcitrant nature of polyvinyl chloride creates serious environmental concerns during manufacturing and waste disposal. The present study was aimed to isolate and screen different soil fungi having potential to biodegrade PVC films. After 10 months of soil burial experiment, it was observed that a number of fungal strains were flourishing on PVC films. On morphological as well as on 18rRNA gene sequence and phylogenetic basis they were identified as Phanerochaete chrysosporium PV1, Lentinus tigrinus PV2, Aspergillus niger PV3, and Aspergillus sydowii PV4. The biodegradation ability of these fungal isolates was further checked in shake flask experiments by taking thin films of PVC (C source) in mineral salt medium. A significant change in color and surface deterioration of PVC films was confirmed through visual observation and Scanning electron microscopy. During shake flask experiments, P. chrysosporium PV1 produced maximum biomass of about 2.57 mg ml(-1) followed by A. niger PV3. P. chrysosporium PV1 showed significant reduction (178,292 Da(-1)) in Molecular weight of the PVC film than control (200,000 Da(-1)) by gel permeation chromatography. Furthermore more Fourier transform infrared spectroscopy and nuclear magnetic resonance also revealed structural changes in the PVC. It was concluded that isolated fungal strains have significant potential for biodegradation of PVC plastics.

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Section: Introductionmentioning

confidence: 86%

Isolation and molecular characterization of polyvinyl chloride (PVC) plastic degrading fungal isolates

Ali

Ahmed

Robson

et al. 2013

J. Basic Microbiol.

152

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“…This category of reported studies show a theoretical basis for the observation of aging presented in different TPSs and the change in MW using various methods such as the dynamic mechanical thermal analysis (DMTA) 134, XRD 135, DSC 136–139, AFM 140–142, SEM, high‐resolution optical microscopy 143–145, gel permeation chromatography 146–150, NMR spectroscopy 76, 133, 151, 152, and Fourier‐transform infrared spectroscopy 153, 154. The mobility of water in these systems was monitored using thermo‐plasticization studies of sorption and diffusion during storage 52, 113, 155.…”

Section: Biodegradation Retrogradation and Agingmentioning

confidence: 99%

Thermoplastic starches: Properties, challenges, and prospects

et al. 2013

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Thermoplastic starch (TPS) polymers were reviewed in this article. This review was categorized into the following studies: the role of starch as a thermoplastic polymer, transformation and melting mechanisms, plasticization and plasticizers, reactive extrusion (REX) and modifications, retrogradation, biodegradability, filler and blenders, and nano‐particle incorporation in thermoplastic starch. This categorization allows us to understand the developments in this field in recent years and shows that the major challenges in the future are reducing sensitivity to moisture and retarding retrogradation of the thermoplastic matrix. Moreover, nano‐particles such as clay can be used in TPS matrices to overcome these disadvantages.

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“…Amylopectin is the major branched component of starch and presents a (1→6) linkage that forms branch points. The hydrophilicity of these polymers is responsible for their incompatibility with most hydrophobic polymers [17]. When exposed to a soil environment, the starch component is easily consumed by microorganisms, leading to increase its porosity by void formation and the loss of integrity of the plastic matrix.…”

Section: Starchmentioning

confidence: 99%

Biocomposites: Influence of Matrix Nature and Additives on the Properties and Biodegradation Behaviour

Rosa¹,

Lenz²

2013

Biodegradation - Engineering and Technology

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Table 1. Classification of natural polymers based on their sources. There are several types of carbohydrates: monosaccharides, disaccharides, oligosaccharides and polysaccharides. The latter ones, of particular interest, are comprised of hundreds or thousands of monosaccharides, commonly glucose, forming linear chains, such as cellulose, or branched chains, as in starch and glycogen. For this chapter, cellulose and its derivatives, starch and chitosan will be presented as natural biodegradable polymers [10]. 2.1.1. Cellulose derivatives Cellulose acetate (CA), universally recognized as the most important organic ester of cellulose because of its extensive applications in fibres, plastics and coatings, is prepared by reacting cellulose with acetic anhydride using acetic acid as a solvent and perchloric acid or sulphuric acid as a catalyst. CA is a carbohydrate composed of β-glucose molecules that are covalently linked through β-1,4-glycosidic bonds, widely found in nature in algae and land plants which has been valued as a functional material. CA comes to meeting the diverse needs of today's society including biodegradability characteristics, its hydrophilic behaviour and biocompatibility [11]. Several applications for cellulose and its derivatives have been shown, for example: in paints, textiles, pharmaceuticals and beauty, fibers, ionic liquids, construction technology and so on [12, 13]. Cellulose esters for coating applications are nearly always used as miscible blends with acrylics, polyesters and other polymers. This is possible because of their ability to form hydrogen bonds through the presence of hydroxyl groups and the carboxyl groups of the ester. An increase in ester molecular weight increases the toughness and melting point but decreases the compatibility and solubility, whereas hardness and density are unaffected. Compatibility, solubility and the maximum non-volatile content all decrease as the ester molecular weight increases. The hydroxyl group content inversely affects the moisture resistance and toughness [11]. Ignácio et al. [14] evaluated the production of cellulosic polymer membranes based on cellulose acetate and thus advanced technology was brougth to be used in membranes for separation Biocomposites: Influence of Matrix Nature and Additives on the Properties and Biodegradation Behaviour

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Evaluation of enzymatic degradation based on the quantification of glucose in thermoplastic starch and its characterization by mechanical and morphological properties and NMR measurements

Cited by 13 publications

References 19 publications

Isolation and molecular characterization of polyvinyl chloride (PVC) plastic degrading fungal isolates

Isolation and molecular characterization of polyvinyl chloride (PVC) plastic degrading fungal isolates

Thermoplastic starches: Properties, challenges, and prospects

Biocomposites: Influence of Matrix Nature and Additives on the Properties and Biodegradation Behaviour

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