Cereal Chem. 70:481-483   |  VIEW ARTICLE

NOTE: Influence of Wheat-Drying Temperatures on the Birefringence and X-Ray Diffraction Patterns of Wet-Harvested Wheat Starch.

H. Koksel, F. Sahbaz, and O. Ozboy. Copyright 1993 by the American Association of Cereal Chemists, Inc. 

A wheat sample (Gerek-79) harvested at 24% moisture content was dried in a semibatch tunnel dryer at different air temperatures (40, 60, 80, and 100 C). The relative crystallinity of the samples, calculated from the X-ray diffractograms, increased with increasing drying temperatures. The sample dried at 40 C contained A-type starch. An additional small peak appeared (2Theta = 20 degrees) at the drying temperature of 60 C. The intensity of this peak increased with increasing drying temperatures. The peak observed at 2Theta = 20 degrees (d spacing, 4.4 Angstrom) is an indication of the formation of V-type structure. With drying temperatures of 80 and 100 C, 95% of the starch granules retained strong birefringence.