Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/22444
Title: Effect of the molecular weight of a neutral polysaccharide on soy protein gelation
Author: Monteiro, Sónia R.
Lopes-da-Silva, José A.
Keywords: Soy proteins
Locust bean gum
Molecular weight
Protein-polysaccharide interactions
Rheology
Microstructure
Issue Date: 27-Sep-2017
Publisher: Elsevier
Abstract: The effects of galactomannans with different molecular weights on the heat–induced gelation characteristics of soybean protein were investigated using dynamic small-strain rheometry, under conditions where the proteins carry a net negative charge (pH 7). Microstructure of the resulting gels was investigated by confocal laser scanning microscopy. Phase-separated systems were obtained with different morphologies and degree of phase separation, depending on both biopolymer concentrations and polysaccharide molecular weight. In general, a gelling enhancing effect on soy proteins was verified, despite extensive phase-separation processes observed at the higher polysaccharide molecular weight. This effect was demonstrated by an increase of the gelation rate, a decrease in the temperature at the onset of gelation, and an increase of gel stiffness and elastic character, with the length of polysaccharide chains. Overall, the results obtained established that the judicious selection of the galactomannan molecular weight may be used to modify the structure and gelation properties of soy proteins, originating a diversity of rheological characteristics and microstructures that will impact on the design of novel food formulations
Peer review: yes
URI: http://hdl.handle.net/10773/22444
DOI: 10.1016/j.foodres.2017.09.066
ISSN: 0963-9969
Appears in Collections:QOPNA - Artigos

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