Morphological and Structural Characteristics of Zein Biofilms with Added Xanthan Gum

Autor(es)

de Almeida, Crislene Barbosa ^[1] ; Catelam, Kelly Tafari ^[1] ; Cornelio, Marinonio Lopes ^[2] ; Lopes Filho, Jose Francisco ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Dept Food Engn & Technol, UNESP, BR-15054000 Sao Jose Do Rio Preto - Brazil

^[2] Sao Paulo State Univ, Dept Phys, UNESP, BR-15054000 Sao Jose Do Rio Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Food Technology and Biotechnology; v. 48, n. 1, p. 19-27, JAN-MAR 2010.
• Citações Web of Science: 8

Resumo

Morphological and structural characteristics of zein-based biofilms have been studied in this work. The sorbitan component in the control formulation of the film was substituted with xanthan gum at concentrations between 0.01 and 0.04% to analyze its effect on lipid dispersion. Scanning electron microscopy (SEM) showed a surface for the control (0 % xanthan) with good lipid distribution. However, when the samples were investigated by optical microscopy (OM), lipid globules in the control biofilm appeared larger and more dispersed in the matrix than in the other samples. Fourier transform infrared (FTIR) spectroscopy indicated that xanthan concentrations deeply affected C=O linkages from amide I group, as well as the functional N-H group of amide H of the zein structure. Other weak interactions of amide I and 11 with carboxylic acids and aliphatic compounds were also observed. UV/VIS analysis as well as transparency measurements indicated that the addition of xanthan to the film matrix lowered significantly its transparency properties. Overall, the addition of xanthan gum favoured lipid dispersion in the matrix, making biofilms more homogeneous, although less transparent. (AU)

• Processo FAPESP: 06/01775-2 - Moagem umida de diferentes hibridos de milho e utilizacao da proteina zeina na producao de biomaterial.
• Beneficiário: José Francisco Lopes Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/02407-4 - Infravermelho em transformada de fourier e correlacao bidimensional (2d-ir) aplicado as proteinas.
• Beneficiário: Marinônio Lopes Cornélio
• Modalidade de apoio: Auxílio à Pesquisa - Regular