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Lancelot, Eloïse; Fontaine, Joran; Grua-Priol, Joëlle; Assaf, Ali; Thouand, Gérald; Le-Bail, Alain
Food chemistry, 10/2021, Letnik: 358Journal Article
•Raman spectroscopy was used to study gluten structure changes during mixing.•Raman spectroscopy measurements were performed directly in the dough matrix.•A thiol blocking reagent was used as a reducing agent to reduce disulphide bonds.•Intermolecular disulphide bonds are decisive for the stability of the gluten network.•Hydrophobic bonds are important in the structural evolution of dough during mixing. The aim of the present study was to evaluate Raman spectroscopy in determining changes that occur in the structure of gluten proteins induced during bread dough mixing. Raman spectra were measured directly within the dough. Three particular phases of mixing were studied: under-mixing, optimum mixing and over-mixing. A thiol blocking reagent, Tris(2-carboxyethyl)phosphine (TCEP) was then used to reduce disulphide bonds within proteins to confirm the important role of disulphide bridges in gluten network formation. For the control dough, the most important changes occurred during the optimum mixing phase when an increase in intermolecular disulphide bonds, anti-parallel β-sheet and α-helix structures was observed, combined with the hydrophobic burial of tryptophan and tyrosine residues. The addition of TCEP appeared to effectively reduce the formation of intermolecular disulphide bonds, anti-parallel β-sheet and α-helix structures and lead to a more disordered secondary protein structure.
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