Effects of phenotype and wet milling procedures on the starch isolation from sorghum (Sorghum bicolor L. Moench) grains

Abstract

<abstract> <p>The current study tends to introduce the effects of three wet milling procedures and sorghum (<italic>Sorghum bicolor L. Moench</italic>) phenotype on starch recovery and some physico-chemical properties of starch isolated from grains. It explores the sorghum grains from landraces, cultivated in the Sahara of Algeria, which in fact has a high percentage of total starch with a little percentage of tannin compared to many regions of the world. This study attempts to unveil that the starch recovery, of fifteen starch isolates, ranged between 58.06% and 83.11%, and their total starch and protein contents ranged from 92.01% to 98.75% and 0.35% to 2.34% respectively. The extents kinetic curves of hydrolysis indicates that starch isolates have high susceptibilities for hydrolysis to glucose by glucoamylase from <italic>Aspergillus niger</italic>, and the degree of hydrolysis ranges from 50.85% to 81.45%. The results demonstrate that the wet milling procedures affect the starch recovery, and protein content and swelling power at 85 ℃ of starch isolates. The effect of grain phenotype appears in moisture content and swelling power at 95 ℃.</p> </abstract>