Morphological and structural heterogeneity of solid gliadin food foams modified with transglutaminase and food grade dispersants.

Research output: Contribution to journalArticle

Abstract

We show in this study the impact of transglutaminase (SB6), glycerol (Gly) and linoleic acid (LA) on the development of gliadin (Glia) solid edible foams. Two concentrations of SB6 were tested, 0.58 U/g and 1.17 U/g, and sufficiently high concentration of SB6 was found essential to crosslink the gliadins. Greater cross-linking in foam prepared with gliadin and 1.17 U/g of SB6 (2-TG-Glia) was followed by an increase of the size of the bubbles as well as improved bubble spatial homogeneity when compared to the non-treated gliadin foam (0-Glia). The inclusion of Gly had little effect on the periodic morphology of 2-TG-Glia, and the formed bubbles decreased in size. The 3D images of 2-TG-Glia revealed that the boundaries of the foams were less defined as observed by x-ray tomography. Nanomorphology studied by SAXS indicated that Gly impared the unfolding of
gliadin in the foam. The addition of linoleic acid (LA) in the foams caused formation of the discontinous Glia network with large and spaced bubbles as revealed by x-ray tomograms. The synergistic interactions of Glia and LA led to the formation of lamellar phases in the foams as observed by SAXS. The results from this study show gliadin as a promising resource to create diverse new aerated foods and contribute to achieve the demand for plant proteins with great foaming functionality. The addition of food-grade dispersants such as, glycerol and
linoleic acid, show a versatility and suitability of gliadin for new food applications such as breakfast cereals and snacks.

Details

Authors
Organisations
External organisations
  • Swedish University of Agricultural Sciences, Alnarp
  • University of Campinas
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Food Science
  • Food Engineering

Keywords

  • Solid food foam, 3-D microstructure, Gliadin protein, Transglutaminase, Crosslinking, Glycerol, Linoleic acid, Morphology, SAXS
Original languageEnglish
Article number105995
Number of pages10
JournalFood Hydrocolloids
Volume108
Publication statusPublished - 2020 May 26
Publication categoryResearch
Peer-reviewedYes