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Artículo

Chitosan molecular weight effect on starch-composite film properties

Bof, Maria JulietaIcon ; Bordagaray, Valeria CarinaIcon ; Locaso, Delia Elisa; Garcia, Maria AlejandraIcon
Fecha de publicación: 05/2015
Editorial: Elsevier
Revista: Food Hydrocolloids
ISSN: 0268-005X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Alimentos y Bebidas

Resumen

The aim of this work was to prepare and characterize composite films based on chitosan (CH) and corn starch (CS), analyzing the influence of the chitosan molecular weight (MW) on film structure and functional properties. Three chitosan products were characterized and classified as low (LMW), medium (MMW) and high (HMW) according to its MW. Rheological behavior of filmogenic solutions depend on CH-MW from Newtonian to pseudoplastic one. Chitosan based film physicochemical properties were strongly affected by its molecular weight: the lower the MW the higher the color differences and film solubility. SEM observations demonstrated that plasticized chitosan films exhibited homogeneous structures, the higher the MW the more compact is the structure and the lower is the water vapor permeability (WVP, 4.55±0.6 ×10-11 g/m s Pa.). Likewise, CH and CS were compatible polymers which led to the development of homogeneous blend films. Polymer interactions were evidenced in FTIR spectra by the shifts observed within the region of 1500-1700cm-1, which reduce the hydrophilic groups? availability of chitosan matrices, leading to a reduction in WVP of composite films. Mechanical properties of the developed films were performed through different complementary tests. Chitosan MW affects both the type and number of interactions, which determine the matrix structure and characteristics. In HMW-CH matrix polymer-polymer interactions are favored, leading to strong and resistant matrices with high dynamic elastic modulus values. Meanwhile, in LMW-CH one, polymer-plasticizer and polymer-solvent interactions became important and the development of high extensible and soluble materials is privileged.
Palabras clave: Chitosan Molecular Weight , Starch , Mechanical Properties , Water Vapor Permeability , Physico-Chemical Properties , Microstructural Analysis
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/42253
DOI: http://dx.doi.org/10.1016/j.foodhyd.2015.05.018
URL: https://www.sciencedirect.com/science/article/pii/S0268005X15002192
Colecciones
Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Bof, Maria Julieta; Bordagaray, Valeria Carina; Locaso, Delia Elisa; Garcia, Maria Alejandra; Chitosan molecular weight effect on starch-composite film properties; Elsevier; Food Hydrocolloids; 51; 5-2015; 281-294
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