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

Author(s)

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

Affiliation

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

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

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 142, n. 2-3, p. 580-585, NOV 15 2013.
• Web of Science Citations: 18

Abstract

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)

• FAPESP's process: 11/08107-3 - Development of zein-based biodegradable films, characterization of the functional and structural properties and evaluation of the use as coatings in the conservation of the physicochemical characteristics of Minas padrão cheese
• Grantee: Carolina Pena Serna
• Support Opportunities: Scholarships in Brazil - Doctorate