Drying of soybean seeds and effect on protein quality and oil extraction efficiency by extruding-expelling process

Soybean seeds (Glycine max) were dried under real scale conditions to different final moisture content (m.c.) (9.1, 9.7, 10.9 %, and control with 16.2 %) processed through extruding-expelling. Results indicated that soybean seed m.c. affected the composition of expeller and, thus, oil extraction efficiency (OEE), which increased as decreased. A polynomic model was proposed for predicting OEE a function m.c., indicating drying 10 % resulted in an approximately 65 %. thin layer experiment protein dispersibility index (PDI) not regards air temperatures up 69 °C, bi-linear non-pre-established break point fitted. The treatment rack type dryer (mixed flow) did show any effect (p > 0.05) on PDI at 80 while 115 °C reduction < observed (PDI 0.8 2.1 percentage points, respectively).