PHYSICAL PROPERTIES OF EDIBLE FILMS BASED ON CASSAVA STARCH AS AFFECTED BY THE PLASTICIZER CONCENTRATION

Autor(es)

Bergo, P. V. A. ; Carvalho, R. A. ; Sobral, P. J. A. ; dos Santos, R. M. C. ; da Silva, F. B. R. ; Prison, J. M. ; Solorza-Feria, J. ; Habitante, A. M. Q. B.

• Tipo de documento: Artigo Científico
• Fonte: ITALIAN JOURNAL OF FOOD SCIENCE; v. 19, p. 6-pg., 2007-01-01.

Resumo

The aim of this work was to investigate the effect of glycerol contents on the physical properties of cassava starch films. Films were prepared from film-forming solutions with 2g cassava starch/100g water plus 0, 15, 30 and 45g glycerol/100g starch, and analyzed to determine its mechanical properties by tensile tests; the glass transition temperature (Tg) by differential scanning calorimetry (DSC); and the crystallinity by X-ray diffraction (XDR). The infrared spectra of the films were also recorded. The resistance values of the films decreased while those of the elasticity increased with the increase of the glycerol concentration, due to plasticizer effect of glycerol, which was also observed in DSC curves. The Tg of the films prepared decreased with the glycerol content. However, for samples with 30 and 45g glycerol/100 g starch, two Tg curves were observed, probably due to a phase separation phenomenon. According to the XRD diffractograms, films with 0 and 15g glycerol/100 g starch presented an amorphous character, but some tendency to show crystalline peaks were observed for films with 30 and 45 g glycerol/100 g starch. The results obtained with FTIR corroborated these observations. (AU)

• Processo FAPESP: 02/09829-3 - Propriedades mecanicas de filmes de fecula de mandioca plastificados com poliois.
• Beneficiário: Rodolfo Maldonado Campoy dos Santos
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 05/54952-6 - Javier Solorza Feria | Instituto Politecnico Nacional - México
• Beneficiário: Paulo José do Amaral Sobral
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 05/57781-8 - Desenvolvimento e caracterização de filmes biodegradáveis à base de blendas de gelatina e PVA
• Beneficiário: Paulo José do Amaral Sobral
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 04/08771-7 - Projeto multi-usuário e multi-institucional para estudo de interações entre polióis e biopolímeros em géis e biofilmes e de açúcares com nanoDSC e FTIR
• Beneficiário: Paulo José do Amaral Sobral
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários