Biblioteca Digital

499 resultados para Serna

Istmo Centroamericano y República Dominicana: desafíos de la crisis global al crecimiento agropecuario

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Incluye Bibliografía

Veja mais

Honduras: tendencias, desafíos y temas estratégicos del desarrollo agropecuario

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Incluye Bibliografía

Veja mais

Objetivos de las políticas de desarrollo económico

Relevância:

10.00% 10.00%

Publicador:

Veja mais

Influence of ethanol and glycerol concentration over functional and structural properties of zein-oleic acid films

Relevância:

10.00% 10.00%

Publicador:

Resumo:

This study was performed in order to determine the effect of the addition of different concentrations of glycerol and ethanol over functional and structural properties of zein-oleic acid films. Films were prepared from zein and oleic acid formulations, containing: 0, 10, 20 and 30% (w/w) of glycerol as plasticizer and 75, 80, 85, 90 and 95% (v/v) of ethanol as zein solvent. Water vapor permeability (WVP) at 4 and 24 C, opacity, water solubility and structural behavior of the film were assessed. The film water barrier properties, WVP and water solubility, were increased when higher ethanol concentration and lower glycerol concentration were used. Furthermore, WVP at 4 C was lower than WVP at 24 C due to the crystalline solid state of oleic acid at lower temperatures. Likewise, opacity, homogeneity and structure of the composite film were improved as ethanol increased and glycerol lowered. © 2013 Elsevier B.V. All rights reserved.

Veja mais