Evaluation of the Dehulling Efficiency of Soybean Using Attrition and Rice Milling Machines

Abstract

A process for mechanical dehulling of soybean was developed. Soybean seeds were soaked in boiling water (100oC) for 5, 10, 15, 20 and 25 minutes respectively. The soaked seeds attained a moisture content of 17 – 24%, so as to facilitate dissolution of the gum layer, which bound the
seed coats to the endosperm. Conditioned seeds were dehulled in the huller section of commercial rice milling machine and attrition milling machine. A dehulling efficiency (e) value of 55%, which corresponded to an
extraction yield (E) of 44% was achieved using the huller section of a commercial rice milling machine, while 90% dehulling efficiency (e), corresponding to an extraction yield (E) of 72%.