Without internal affiliation

  • Author: Alftrén, Johan


  • Author: Peñarrieta, J. Mauricio

    Lund University

  • Author: Bergenståhl, Björn

    Lund University

  • Author: Nilsson, Lars

    Lund University

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The molecular and emulsifying properties of gum arabic (GA) and mesquite gum (MG) were characterized using asymmetrical flow field-flow fractionation connected to multi-angle light scattering and refractive index detection. Properties such as molar mass, root-mean-square radius (rrms), hydrodynamic radius (rh), conformation, apparent densities and distribution of proteinaceous matter over the whole molar mass range were determined. GA displayed a low molar mass (3.4 105 g/mol), protein-poor component (population 1) and a high molar mass (1.9 106 g/mol), protein-rich component (population 2). MG displayed one molar mass population with an average molar mass of 1.1 106 g/mol. For both GA and MG, the conformation (rrms/rh) was increasingly spherical with increasing molar mass. However, MG had higher values of rrms/rh for a specific molar mass suggesting differences in structure between GA and MG. The protein content increased with increasing molar mass for both gums, although to a higher extent for GA. Selective adsorption, during emulsification experiments, could be observed of population 2 of GA which may be due to a combination of the higher protein content and a more flexible structure rendering it more surface active than population 1. Comparing GA and MG in terms of emulsion stability, it could be concluded that GA-stabilized emulsions have considerably higher stability against coalescence.
Keyword: Exudate gums,Emulsion,Field-flow fractionation,Mesquite gum,Gum arabic,Hydrocolloids
Original languageEnglish
JournalFood Hydrocolloids
Issue number1
Pages (from-to)54-62
StatePublished - 2012
CitationsWeb of Science® Times Cited: 17
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ID: 5734392