Structure and properties of waxy-rice (IR29) starch during development of the grain uri icon

abstract

  • The structure and properties of a waxy-rice (IR29) starch were analysed at 7,11,15, and 30 days after flowering (DAF). The iodine affinity, blue value, and lambda(max) of the iodine-stained solutions of the starches and their isoamylolysates, the beta-amylolysis limits, and the limiting viscosity number of the starches were largely constant during development of the grain. The number-average chain length and chain-length distribution were not significantly different. Starch granules, both spherical and polygonal, were smaller at 7 DAF than in the later stages, as revealed by scanning electron microscopy. These data suggest that only complete molecules are packed into the granules.

publication date

  • 1992
  • 1992
  • 1992