Effect of extrusion on the emulsifying properties of soybean proteins and pectin mixtures modelled by response surface methodology

Autor(es)

Bueno, Arthur Soares ^[1] ; Pereira, Cristina Meyer ^[1] ; Menegassi, Bruna ^[2] ; Areas, Jose Alfredo Gomes ^[2] ; Castro, Inar Alves ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Food & Expt Nutr, Fac Pharmaceut Sci, BR-05508900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Nutr, Fac Publ Hlth, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Food Engineering; v. 90, n. 4, p. 504-510, FEB 2009.
• Citações Web of Science: 18

Resumo

The objective of this study was to apply response surface methodology to estimate the emulsifying capacity and stability of mixtures containing isolated and textured soybean proteins combined with pectin and to evaluate if the extrusion process affects these interfacial properties. A simplex-centroid design was applied to the model emulsifying activity index (EAI), average droplet size (D-{[}4.3]) and creaming inhibition (Cl%) of the mixtures. All models were significant and able to explain more than 86% of the variation. The high predictive capacity of the models was also confirmed. The mean values for EAI, D-{[}4.3] and Cl% observed in all assays were 0.173 +/- 0.015 mn, 19.2 +/- 1.0 mu m and 53.3 +/- 2.6%, respectively. No synergism was observed between the three compounds. This result can be attributed to the low soybean protein solubility at pH 6.2 (<35%). Pectin was the most important variable for improving all responses. The emulsifying capacity of the mixture increased 41% after extrusion. Our results showed that pectin could substitute or improve the emulsifying properties of the soybean proteins and that the extrusion brings additional advantage to interfacial properties of this combination. (C) 2008 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/02682-0 - Aplicação de metodologia de superfície de resposta na otimização de biossurfactantes para uso em alimentos à base de misturas de proteínas com polissacarídeos
• Beneficiário: Cristina Meyer Pereira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 06/00384-0 - Aplicação de metodologia de superfície de resposta na otimização de biosurfactantes para uso em alimentos à base de misturas de proteínas com polissacaridios
• Beneficiário: Inar Castro Erger
• Modalidade de apoio: Auxílio à Pesquisa - Regular