Abstract
The physicochemical properties of gliadin upon mild thermal treatment were studied in terms of polymerization behavior, conformation and viscoelasticity. Gliadin samples were heated at 40, 60 and 90°C for up to 20min. Results showed that α-gliadin started to polymerize via disulfide (SS) bonds before γ-gliadin at 90°C, resulting in the extractability loss in aqueous ethanol. β-Turn and specific β-sheet structures were partially conversed to α-helices during thermal treatment. Rearrangement of non-covalent forces might contribute to viscosity loss of gliadin at 40 and 60°C. However, the elevated elasticity at 90°C was mainly due to gliadin polymerization while the viscosity variation was resulted from combined effects of non-covalent forces and covalent SS bonds. This study could offer insight into the variation of gliadin characteristics during the early baking process.
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