Starches were isolated from immature waxy corn kernels harvested at 0, 2, 4 and 6 days after optimum
stage (DAO) and from mature kernels at 16 DAO. The starch contents showed varied according to genotypes
and harvesting stages. The accumulation of starches showed an increasing trend in relation to
delayed harvesting time, from the optimum stage until the physiological maturity stage. Among all harvesting
stages, medium granules had the highest contribution to the total starch volume (60.8–81.5%),
followed by large (5.7–30.1%), and small granules (9.1–15.3%). Average chain length distribution of amylopectin
ranged from DP 14.7 to 16.9 for KKU–UB, DP 16.9 to 17.4 for KKU–JD, and DP 5.7 to 30.1 for Violet
white. The pasting behaviors of starches were greatly affected by harvesting times. The peak viscosity of
starches increased with delayed harvesting until physiological maturity and then decreased until dried
kernels at 35 days after pollination.