Properties of extruded xanthan-starch-clay nanocomposite films

Brazilian Archives of Biology and Technology

Cristina De Melo²  Patrícia Salomão Garcia¹  Maria Victória Eiras Grossmann¹  Fábio Yamashita¹  Luiz Henrique Dall'antônia¹  Suzana Mali² 

[1] ,Universidade Estadual de Londrina Centro de Ciências Exatas Departamento de Bioquímica e BiotecnologiaLondrina PR ,Brasil

关键词: film blowing;    cassava starch;    microstructure;    mechanical properties;    water vapor permeability;   

DOI  :  10.1590/S1516-89132011000600019

来源: SciELO

【 摘 要 】

The aim of this work was to manufacture the biodegradable nanocomposite films by extrusion from different combinations of cassava starch, xanthan gum and nanoclays (sodium montmorillonite - MMT- Na) and to characterize them according to their microstructure, optical, mechanical and barrier properties. Films were manufactured from nine starch/xanthan/nanoclay combinations, containing glycerol as plasticizer. Scanning electron microscopy (SEM) of the starch-xanthan extruded films showed reticulated surface and smooth interior, indicating that the gum was mostly concentrated on the surface of the films, while starch/xanthan/nanoclays films showed a more homogeneous surface, suggesting that the introduction of nanoclays provided a better biopolymeric interaction. In general, nanoclays addition (2.5 - 5.0, w%) generated more transparent and resistant films, with lower water vapor permeabilities and lower water sorption capacities and xanthan gum addition improved the elongation ofa starch films.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License