Artículo
Microstructural characterization of yam starch films
Mali, Suzana; Grossmann, María Vitória E.; Garcia, Maria Alejandra
; Martino, Miriam Nora
; Zaritzky, Noemi Elisabet
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Fecha de publicación:
12/2002
Editorial:
Elsevier
Revista:
Carbohydrate Polymers
ISSN:
0144-8617
e-ISSN:
1879-1344
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Yam starch films were produced by thermal gelatinization of starch suspensions using different starch and glycerol concentrations and were compared to control samples without glycerol. Films were characterized by polarized light microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermomechanical analysis (TMA), X-ray diffraction, water vapor permeability (WVP) and water sorption isotherms. The polarized light microscopy and DSC data showed that starch gelatinization for film formation was complete. Plasticized films have a homogeneous structure as observed by SEM. At water activities >0.43, glycerol increased the equilibrium moisture content of the films due to its hydrophilic character. X-ray pattern of the yam films could be assigned to a B-type starch; during storage this pattern remained almost the same, however a slight recrystallization process could be observed. Amylopectin retrogradation was not observed by DSC with storage time of the films. Glass transition temperatures of films with glycerol were lower than those of control films as measured by DSC and TMA. WVP of yam starch films increased with the presence of glycerol.
Palabras clave:
BIODEGRADABLE FILMS
,
MICROSTRUCTURE
,
PLASTICIZER
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Identificadores
Colecciones
Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Citación
Mali, Suzana; Grossmann, María Vitória E.; Garcia, Maria Alejandra; Martino, Miriam Nora; Zaritzky, Noemi Elisabet; Microstructural characterization of yam starch films; Elsevier; Carbohydrate Polymers; 50; 4; 12-2002; 379-386
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