Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/63942
Type: Artigo de periódico
Title: EFFECT OF THE CHEMICAL TREATMENT ON THE MECHANICAL PROPERTIES, WATER VAPOR PERMEABILITY AND SORPTION ISOTHERMS OF GELATIN-BASED FILMS
Author: Carvalho, RA
Grosso, CRF
Sobral, PJA
Abstract: Proteins contain hydrophilic groups which can bind to the water molecule through hydrogen bridges resulting in water adsorption. The increase of the cross-linking degree can be an alternative to improve the cohesiveness force and functional properties of protein based films. Thus, the objective of this work was to evaluate the effect of chemical treatment of gelatin with formaldehyde and glyoxal on the mechanical properties, water vapor permeability and water vapor sorption characteristics of gelatin based films. Films were produced using gelatin, with and without chemical treatment. The chemical treatments caused a reduction on the water vapor permeability, however, only the formaldehyde allowed a significant increase on the tensile strength. The GAB and Halsey models could be used to model the sorption isotherms of films. It was observed that the increase of the temperature produced a decrease in water sorption and the chemical modifications caused a slight reduction on the monolayer moisture content.
Subject: physical properties
protein
cross-link
formaldehyde
glyoxal
Country: Itália
Editor: Chiriotti Editori
Citation: Italian Journal Of Food Science. Chiriotti Editori, v. 19, n. 221, n. 225, 2007.
Rights: fechado
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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