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Research article2020Peer reviewedOpen access

Gelation of faba bean proteins - Effect of extraction method, pH and NaCl

Langton, Maud; Ehsanzamir, Sohail; Karkehabadi, Saeid; Feng, Xinmei; Johansson, Monika; Johansson, Daniel P.

Abstract

The effect of extraction method, pH and NaCl addition on rheological properties and microstructure of heat-induced faba bean protein gels was evaluated. Gels formed at pH 7 (no NaCl) of alkaline-extracted protein had the densest and finest network structure and highest stress and strain at fracture. The high density of nodes and small pores in the protein network could contribute to those mechanical properties. In contrast, storage modulus (G') and Young's modulus were lowest for protein gels at pH 7. The gels formed at pH 5 had high G' and Young's modulus, whereas stress and strain at fracture were lower, especially for gels formed from alkaline-extracted protein. Gels formed at pH 5 with 2% NaCl had two types of internal gel network, caused by a change in solubility of 7S globulins. When the protein powder was dissolved in water, particle size was dependent on the extraction method, with alkaline extraction giving much larger protein particles than soaked extraction.

Keywords

faba beans; gelation

Published in

Food Hydrocolloids
2020, Volume: 103, article number: 105622Publisher: ELSEVIER SCI LTD