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|Type:||Artigo de periódico|
|Title:||Water Vapor Barrier And Mechanical Properties Of Starch Films Containing Stearic Acid|
|Abstract:||Polysaccharide is often used as a low-cost renewable source for the manufacture of films. Starch films present appropriate mechanical and oxygen barrier properties, but are sensitive to humidity. In order to improve their water vapor permeability the addition of lipids such as stearic acid to starch films has been studied. The films were prepared using different concentrations of stearic acid (3.76-12.24g/100g dry starch) and glycerol (21.76-30.24g/100g dry starch). The suspensions were prepared as emulsions, using a stirring frequency of 200Hz (12,000rpm). The effects of the stearic acid concentration and glycerol on the mechanical properties, solubility in water and water vapor permeability were evaluated using response surface methodology (RSM). It was found that the addition of stearic acid to starch films affected the mechanical properties. Moreover, films elaborated with 4g stearic acid and 24g glycerol/100g starch presented reductions in the water vapor permeability (WVP=1.93×10 -7gm/m 2Pah) and solubility in water (S≅25%). This work demonstrates that the addition of stearic acid to films could be an alternative to reduce their solubility in water and water vapor permeability, thus promoting their physical properties. © 2012 Elsevier B.V.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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