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Abstract
Susceptibility of waxy starch granules to mechanical damage. Cereal Chemistry 77:750-753
Bettge,A.D., Giroux,M.J. and Morris,C.F.
USDA-ARS Western Wheat Quality Lab and Montana State University Dept of Plant Sciences
Starch samples isolated from wheat flour that represented four possible waxy states (0, 1, 2 and 3-gene waxy) were subjected to crushing loads under both dry and wet conditions. Calibrated loads of 0.5 to 20 kg were applied to the starch samples and the percentage of damaged granules was visually determined. Under dry crushing conditions, starches containing amylose (0, 1 and 2-gene waxy) had between 1% (5 kg load) to 3% (15 and 20 kg load) damaged granules, whereas waxy starch (3-gene waxy; less than 1% amylose) began rupturing at 0.5 kg load (3.5% damaged granules) and had 13% damaged granules when 10 kg or more load was applied. Under wet crushing conditions, normal and partial waxy starch (0, 1 and 2-gene waxy) showed little difference in percentage of damaged granules when compared to the results of dry crushing. Waxy starch (3-gene waxy) however, showed substantially increased numbers of damaged granules: 12% damaged granules at 0.5 kg load, rising to 55% damaged granules at 15 kg load. The results indicate that waxy starch granules are less resistant to mechanical damage than normal starch granules. Further, blends of normal and waxy wheats or wheat flours intended to have a particular amylose/amylopectin ratio will be a complex system with unique processing and formulation considerations and opportunities.
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