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Elastic properties of gluten representing different wheat classes

Zhao, Dongjun, Mulvaney, Steven, Chinnaswamy, Rangan, Rayas-Duarte, Patricia, Allvin, Bo, Wang, Min
Journal of cereal science 2010 v.52 no.3 pp. 432
wheat classes, wheat, wheat gluten, shear stress, shear strength, tensile strength, extensibility, elasticity (mechanics), breadmaking quality, bread dough, cultivars, hard white wheat, soft white wheat
Traditional instruments used to evaluate dough and/or gluten rheological properties do not provide unambiguous separation of elastic and viscous behaviors. Recovery after shear creep and cyclic large deformation cyclic tensile testing were used here to decouple elastic and viscous effects. A large variation in the recoverable shear strain (approximately 7.2% to approximately 28%) was seen for glutens from 15 U.S. popular common wheat cultivars with varying HMW subunits. Sedimentation values ranged from 29 to 57 ml for 12 hard wheat cultivars and 15 to 22 ml for three soft wheat cultivars. The tensile force at 500% extension ranged from 0.12 to 0.67 N for hard wheat glutens and from 0.10 to 0.20 for soft wheat glutens. However, the recoverable work after large extension was less than 40% of the total work of extension. In addition, recoverable work in tensile testing was highly correlated with the total work of extension (r2 = 0.97) and mixograph mix times (r2 = 0.81). Good to excellent bread volume was obtained for several cultivars from this sample set. This suggests that optimizing water absorption for mixing doughs to achieve maximal bread volume compensates for the wide range of viscoelastic behaviors of gluten.