Artículo
Thermoplastic starch plasticized with alginate-glycerol mixtures:Melt-processing evaluation and film properties
Lopez, Olivia Valeria
; Ninago, Mario Daniel
; Lencina, María Malvina Soledad
; García, Maria Alejandra; Andreucetti, Noemi Amalia; Ciolino, Andrés Eduardo
; Villar, Marcelo Armando
Fecha de publicación:
21/03/2015
Editorial:
Elsevier
Revista:
Carbohydrate Polymers
ISSN:
0144-8617
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Corn starch melt-processing in the presence of a commonly used plasticizer mixture (water/glycerol)and a non-conventional alternative (alginate/glycerol) was evaluated. All assayed formulations weresuccessfully processed by melt-mixing and injected in circular probes. It was determined that all samples presented a typical viscoelastic behavior, observing a decrease in storage and loss modulus withwater and alginate concentration, which facilitated samples processability. Concerning to thermal sta-bility, it was not affected neither for water nor alginate presence. From injected probes, flexible filmswere obtained by thermo-compression. Films with the highest assayed water content presented a stickyappearance, whereas those containing alginate were non-tacky. Plasticizing action of water and alginatewas evidenced by the occurrence of homogeneous fracture surfaces, without the presence of unmeltedstarch granules. Besides, the shift of glass transition temperature to lower values also corroborated theplasticizing effect of both additives. In conclusion, obtained results demonstrated the well-plasticizingaction of sodium alginate on starch matrix, turning this additive into a promissory alternative to replacewater during melt-processing of thermoplastic corn-starch.
Palabras clave:
Corn Starch
,
Sodium Alginate
,
Plasticizer
,
Melt Processing
Archivos asociados
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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)
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Lopez, Olivia Valeria; Ninago, Mario Daniel; Lencina, María Malvina Soledad; García, Maria Alejandra; Andreucetti, Noemi Amalia; et al.; Thermoplastic starch plasticized with alginate-glycerol mixtures:Melt-processing evaluation and film properties; Elsevier; Carbohydrate Polymers; 126; 21-3-2015; 83-90
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