Parametric modelling of wheat grain morphology: a new perspective

12 ref.International audienc

Mechanical properties of wheat seed coats

International audienc

La dureté des blés : état des connaissances actuelles

National audienc

Influence of instrument rigidity and specimen geometry on calculations of compressive strength poperties of wheat endosperm

IATE Axe 5 : Application intégrée de la connaissance, de l’information et des technologies permettant d’accroître la qualité et la sécurité des alimentsEndosperm texture is one of the most important quality features in wheat; it defines milling energy requirements and end-use suitability. From an engineering perspective, texture can be quantified by measuring the physical property of the resistance force to crushing of precisely machined specimens of endosperm. In such procedures, cylindrical or parallelepiped blocks are crushed under a constant rate of strain, in which values are reported of maximum stress, strain at maximum stress, Young's modulus, and the energy of compression to the point of maximum stress. Generally overlooked, however, is the instrument itself, which can significantly affect the apparent values of the latter three properties. Because no instrument is infinitely rigid, departures between apparent and actual strength properties occur. In this study, the physical principles for compressive strength measurement with respect to corrections for instrument rigidity are developed. Results show that the departures are exacerbated in specimens of small slenderness ratio and elevated hardness. This issue is demonstrated in a small collaborative study involving three laboratories and three instruments with low, intermediate, and high rigidity. Specimens were prepared from wheat kernels from hard and soft near-isogenic lines derived from the cultivar Alpowa. For strain at maximum stress, the implementation of a correction for instrument rigidity reduced the range across laboratories from 6.03-47.7% (before correction) to 4.49-7.35% (after correction) for the hard genotype, and the corresponding ranges for the soft genotype were 3.29-18.6% and 2.07-6.01%, respectively. For Young's modulus, instrument rigidity correction resulted in a tenfold correction for the hard genotype measured on the least rigid instrument, going from 0.21 GPa (before) to 4.9 GPa (after). Likewise, with this instrument, the imparted energy density to maximum stress was reduced from an average apparent value of 23 MJ/m(3) (before) to 3.8 MJ/m(3) (after). Because of these large differences between apparent and actual values for these physical-strength properties, it is recommended that future strength property measurements should account for instrument rigidity by implementation of the correction procedure described herein

Rheological properties of wheat endosperm with a view on grinding behaviour

International audienc

Relationship between the structure and the rheological properties of Durum wheat bran

National audienc

Procédés de création des produits céréaliers

chap. 19National audienc

Description of a micromill with instrumentation for measuring grinding characteristics of wheat grain

International audienc

Evaluation of tissue dissociation of Durum wheat grain (Triticum durum Desf.) generated by the milling process

24 ref.International audienc