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

Autor(es)

Pena-Serna, Carolina ^{[1, 2]} ; Lopes-Filho, Jose Francisco ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Food Engn & Technol Dept, Sao Jose Do Rio Preto - Brazil

^[2] Univ Antioquia, Agr Sci Fac, Medellin - Colombia

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 142, n. 2-3, p. 580-585, NOV 15 2013.
• Citações Web of Science: 18

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 degrees 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 degrees C was lower than WVP at 24 degrees 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. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/08107-3 - Desenvolvimento de filmes biodegradáveis à base de zeína, caracterização das propriedades funcionais e estruturais e avaliação do uso como cobertura na conservação das características físico-químicas do queijo Minas padrão
• Beneficiário: Carolina Pena Serna
• Modalidade de apoio: Bolsas no Brasil - Doutorado