effect of modified clays on the structure and functional properties of biofilms produced with zein efeito das argilas modificadas na estrutura e propriedades funcionais de biofilmes produzidos com zeína

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ID: 227229
2012
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Abstract
The purpose of this study was to evaluate changes in the structure and some functional properties of biofilms added with modified clays (Cloisite® 15A and Cloisite® 30B) prepared by the casting method. The analysis of the microstructure of the films, scanning electron microscopy (SEM), Optical microscopy (MO), and Infrared Spectroscopy (FTIR) indicated that the addition of clay in the films resulted in the formation of a heterogeneous microstructure, microcomposite or tactoid. Due to the formation of a microcomposite structure, functional properties of the films added with both clays such as opacity, solubility, and permeability to water vapor (PVA), were not better than those of the control film. Thus, it was concluded that although it is possible to produce a film added with modified clays using the casting method, it was not possible to obtain intercalation or exfoliation in a nanocomposite, which would result in improved functional properties.
O propósito deste estudo foi avaliar mudanças na estrutura e em algumas propriedades funcionais de biofilmes de zeína adicionados de argilas modificadas (Cloisite® 15A e Cloisite® 30B) elaborados pela técnica casting. Por meio do uso de técnicas de análise de microestrutura dos filmes, Microscopia Eletrônica de Varredura (MEV), Microscopia Ótica (MO) e Espectroscopia no Infravermelho (FTIR), observou-se que os acréscimos de argilas resultaram na formação de uma microestrutura heterogênea, formando um microcompósito ou tactoide. Devido à formação da estrutura tipo tactoide, as propriedades funcionais de opacidade, solubilidade e permeabilidade ao vapor d'água (PVA), para os filmes adicionados de argilas, não foram melhores do que as obtidas para o filme controle. Assim, concluiu-se que é possível elaborar um filme adicionado de argilas modificadas usando a técnica casting, porém não foi possível obter intercalação ou esfoliação em nanocompósito, os quais resultariam em melhores propriedades funcionais.
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tavares2012foodeffect Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Luciana Lopes Tavares;Crislene Barbosa de Almeida;Ícaro Putinhon Caruso;Marinônio Lopes Cornélio;José Francisco Lopes Filho
Journal software - practice and experience
Year 2012
DOI
DOI not found
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000200017
Keywords
clays biofilms zein foods and food supplytechnology (general) tactoidesnutrition

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