Effects of vegetal fibers on properties of cassava starch biodegradable composites produced by extrusion

被引:15
作者
Debiagi, Flavia [1 ]
Mali, Suzana [1 ]
Eiras Grossmann, Maria Victoria [2 ]
Yamashita, Fabio [2 ]
机构
[1] Univ Estadual Londrina, Dept Bioquim & Biotecnol CCE, BR-86051990 Londrina, PR, Brazil
[2] Univ Estadual Londrina, Dept Ciencia & Tecnol Alimentos CCA, BR-86051990 Londrina, PR, Brazil
来源
CIENCIA E AGROTECNOLOGIA | 2010年 / 34卷 / 06期
关键词
Food packaging; sugar cane fibers; oat hull fibers; CELLULOSE FIBERS; BAKING PROCESS; CORN MEAL; FILMS; FOAMS; GLYCEROL; COOKING; COLOR; FLOUR;
D O I
10.1590/S1413-70542010000600024
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
The concern with the volume of waste has generated interest in the development of biodegradable packaging able to replace, at least in part, the conventional synthetic plastics, such as packs of expanded polystyrene (Isopor). This study aimed to characterize the expansion index, density, the water absorption index (WAI), water solubility index (WSI) and color (coordinates L*, a* and b*) of expanded biodegradable composites produced by extrusion, from the mixture cassava starch, glycerol (plasticizer) and two different types of vegetable fibres. The composites were prepared in a single screw extruder, with three different levels of oat or sugar cane fibres (0, 5 and 10 g/100 g starch), two levels of humidity (18 and 26%) and a fixed level of glycerol (20 g/100 g solds). The addition of fibres did not affect significantly the expansion index, density and WAI of materials, and reduced WSI of products, which is an advantage and promotes the use of these fibres in the reinforcement of composites. The addition of fibers led to the darkening of the samples, with decrease in lightness (L*) and increase in the values of the color parameters a* and b*. This study is a key step for a future industrial scale production of these composites, which requires process conditions that provide reproducible results of expansion and absorption capacity and solubility in water, properties of great importance in these products.
引用
收藏
页码:1522 / 1529
页数:8
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