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Doktorsavhandling2024Öppen tillgång

Texture and microstructure of legume-based mixed gels

Johansson, Mathias

Sammanfattning

Reducing consumption of animal-based proteins by shifting to plant-based alternatives can significantly reduce of the environmental impact of food consumption. Faba bean and pea are protein-rich crops which could act as local plant protein sources in cool climate regions such as Sweden.

Focusing on texture and microstructure, this thesis explored creation of mixed gels mainly from laboratory-extracted faba bean protein, starch and fibre but also from a commercial pea protein isolate. Analysis revealed that gel microstructures dominated by larger protein aggregates resulted in weak gels with low fracture stress. Addition of NaCl was found to have different effects on the gel formation by the two major protein fractions (7S and 11S) in faba bean. Gel texture was also modified by adding starch- and fibre-rich side-streams obtained from protein extraction. At pH 7, substituting part of the protein (constant solids content) with starch and/or fibre increased gel storage modulus and decreased fracture stress and fracture strain. The decrease in fracture stress was attributed to introduction of inhomogeneities into the protein matrix. At pH 4 and 5, fibre addition increased fracture stress, an effect attributed to the existing microstructure already containing larger protein particles in the same size range as the added fibre.

The results presented in this thesis extend knowledge of gel formation by plantbased proteins, and specifically of texture formation by protein from non-soy legumes. This can facilitate development of plant-based foods from a broader range of protein sources.


Nyckelord

faba bean; pea, protein gelation; starch; fibre; rheology

Publicerad i

Acta Universitatis Agriculturae Sueciae
2024, nummer: 2024:21ISBN: 978-91-8046-306-5, eISBN: 978-91-8046-307-2Utgivare: Swedish University of Agricultural Sciences

    UKÄ forskningsämne

    Livsmedelsteknik
    Biokemi och molekylärbiologi

    Publikationens identifierare

    DOI: https://doi.org/10.54612/a.6v1pth6al3

    Permanent länk till denna sida (URI)

    https://res.slu.se/id/publ/128045