PLA and Organoclays Nanocomposites: Degradation Process and Evaluation of ecotoxicity Using Allium cepa as Test Organism

dc.creatorSouza, PMS
dc.creatorCorroque, NA
dc.creatorMorales, AR
dc.creatorMarin-Morales, MA
dc.creatorMei, LHI
dc.date2013
dc.dateDEC
dc.date2014-07-30T14:32:13Z
dc.date2015-11-26T16:46:53Z
dc.date2014-07-30T14:32:13Z
dc.date2015-11-26T16:46:53Z
dc.date.accessioned2018-03-28T23:32:51Z
dc.date.available2018-03-28T23:32:51Z
dc.identifierJournal Of Polymers And The Environment. Springer/plenum Publishers, v. 21, n. 4, n. 1052, n. 1063, 2013.
dc.identifier1566-2543
dc.identifier1572-8900
dc.identifierWOS:000326933700019
dc.identifier10.1007/s10924-013-0604-0
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/59873
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/59873
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274670
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionIn this study, nanocomposites of PLA and organoclays Cloisite 20A and Cloisite 30B were prepared by the melt intercalation method and the obtained samples were characterized by transmission electron microscopy (TEM). Since composting is an important proposal to the final disposal of biopolymers, the influence of clays on the hydrolytic degradation process of PLA was evaluated by visual analysis and monitoring of molecular weight after periods of 15 and 30 days of degradation in compost. After degradation of the materials in composting environment, the evaluation of cytotoxic, genotoxic and mutagenic effects of compost aqueous extract was carried out using a bioassay with Allium cepa as test organism. The TEM micrographs permitted the observation of different levels of dispersion, including exfoliated regions. In the evaluation of hydrolytic degradation it was noted that the presence of organoclays can decrease the rate of degradation possibly due to the barrier effect of clay layers and/or the higher degree of crystallinity in the nanocomposite samples. Nevertheless, even in the case of nanocomposites, the molecular weight reduction was significant, indicating that the composting process is favorable to the chain scission of PLA in studied materials. In the analysis performed by the bioassay using A. cepa as test organism, it was found that after degradation of the PLA and its nanocomposites the aqueous extract of compost samples induced a decreasing in the mitotic index and an increasing in the induction of chromosomal abnormalities. These results were statistically significant in relation to the negative control (distilled water). By comparing the results obtained for the nanocomposites in relative to pure polymer, there were no statistically significant differences. The types of the observed chromosomal aberrations indicated a possible genotoxic effect of the materials, which may be related to an aneugenic action of PLA degradation products.
dc.description21
dc.description4
dc.description1052
dc.description1063
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFAPESP [2011/14250-3, 2012/00227-2]
dc.languageen
dc.publisherSpringer/plenum Publishers
dc.publisherNew York
dc.publisherEUA
dc.relationJournal Of Polymers And The Environment
dc.relationJ. Polym. Environ.
dc.rightsfechado
dc.rightshttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dc.sourceWeb of Science
dc.subjectPLA
dc.subjectNanocomposites
dc.subjectOrganoclays
dc.subjectComposting
dc.subjectEcotoxicity
dc.subjectBioassay
dc.subjectAllium cepa
dc.subjectChromosome-aberration Assay
dc.subjectPoly(lactic Acid)
dc.subjectSilicate Nanocomposites
dc.subjectLayered Silicate
dc.subjectTest System
dc.subjectPart 2
dc.subjectPolylactide
dc.subjectCompostability
dc.subjectWaste
dc.subjectBiodegradability
dc.titlePLA and Organoclays Nanocomposites: Degradation Process and Evaluation of ecotoxicity Using Allium cepa as Test Organism
dc.typeArtículos de revistas


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