PURPOSE:To obtain corn gluten meal digestible with protease even in the presence of salt, and to increase the value of the corn gluten meal as a protein raw material for food processing, by heating corn gluten meal at a specific temperature under specific alkaline conditions of a specific pH range. CONSTITUTION:A modified corn gluten meal is prepared by heating corn gluten meal at 40-120 deg.C, pref. 60-100 deg.C, under an alkaline condition of =pH12, pref. 8-12. The pH control is pref. carried out by the use of sodium hydroxide, potassium hydroxide, sodium carbonate, etc. in view of food sanitation. The modified corn gluten meal thus prepared is converted to a slurry of pH4-5 to precipitate the protein, which is separated by centrifugation, etc., optionally washed with water and freeze-dried, slurrified again with a proper amount of water, and spray-dried to obtain the objective raw material for food processing.
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