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Effects of Storage and Granary Weevil Infestation on Gel Electrophoresis and Protein Solubility Properties of Hard and Soft Wheat Flours.
Journal of Economic Entomology 2018 May 29
The objective of this study was to investigate the effects of storage and granary weevil, Sitophilus granarius (L.; Coleoptera: Curculionidae), infestation on pH, protein solubility (PS) and gel electrophoresis properties of meal and roller-milled flours of hard (Ceyhan-99 cv.) and soft (Eser cv.) wheat cultivars, respectively, after 6 mo of storage. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) technique was applied for studying the electrophoretic properties. Hard and soft wheats were infested with non-sexed S. granarius at a rate of two adults/ kg, and stored for 6 mo at 30 ± 1°C and 70 ± 5% RH. The pest-free wheat samples were used as control. The infested and its control samples were collected monthly, and after cleaning the granary weevils, they were hammer-milled or roller-milled in order to get meal flours and roller-milled flours, respectively. The effect of infestation on the storage proteins was more obvious in meal flours than that of the roller-milled flours. Granary weevil feeding resulted secreting of hydrolyzing enzymes and increased the acidity of flours; subsequently the breaking and releasing of some storage proteins generally caused a decrease in pH and an increase in PS values of the meal flours of wheat cultivars. SDS-PAGE results generally indicated that towards the end of storage, the insect population, that greatly increased, caused minor protein depletions resulting decreasing protein band intensities between 113 and 58 kDa of hard wheat meal flour and 101 and 40 kDa of soft wheat roller-milled flour. Consequently, the potential effect of changes probably occurred in high molecular weight glutenin subunits of both wheat cultivars.
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