Production of hybrid gels from polysorbate and gellan gum

Autor(es)

Fasolin, L. H. ^[1] ; Picone, C. S. F. ^[1] ; Santana, R. C. ^[1] ; Cunha, R. L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Food Engn, Dept Food Engn, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Food Research International; v. 54, n. 1, p. 501-507, NOV 2013.
• Citações Web of Science: 9

Resumo

The association of gellan gum and nonionic surfactant in the gel formation was explored in systems with high biopolymer concentration (3% w/w). Gels formed with different concentrations of polysorbate 80 (0-60% w/v) and pH (3.0 and 5.0) were evaluated from their microstructure, mechanical and theological properties. The high concentration of polysaccharide in water at more acidic pH (3.0) favored the aggregation of molecules, producing harder gels even at high temperatures. The thermal theological measurements showed two distinct behaviors which depending on the predominance of polysaccharide or surfactant in the systems. The gellan gum properties were predominant at lower surfactant concentrations. However, the surfactant micelles could enhance the linkage between the macromolecules through the few remaining hydrophobic sites of the biopolymer and consequently increase the gel strength that presented strain-hardening behavior. As the surfactant concentration was increased to 30% (w/w), different slopes in the theological curves were observed. They were attributed to the structuration of the polysorbate. At higher concentration of polysorbate, the surfactant prevented the gellan gum aggregation and the gum did not exert influence on the theological behavior, which was related to the surfactant structuration. The surfactant self-assembly produced weaker gel-like structures than the gellan network, presenting a strain-weakening behavior. Thus, results suggest that depending on the medium conditions, gellan-polysorbate 80 interaction could produce different gels with different technological properties. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/54137-1 - EMUS: aquisição de um analisador de distribuição de tamanho de partículas, um medidor de potencial zeta, um spray dryer e um sistema de cromatografia líquida de ultra alta pressão / espectrômetro de massa
• Beneficiário: Miriam Dupas Hubinger
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários