PROBLEM TO BE SOLVED: To provide a flour milling pretreatment method capable of finely pulverizing to a starch single grain while increasing γ-aminobutyric acid content while making use of a phenomenon that cracks are generated on a rice grain surface by repeating a water adding step and a drying step.SOLUTION: There are included: a raw material supply step of charging raw material grains into a container a first humidification step of humidifying the grains in the container a drying step of drying the grains after humidifying in the first humidification step so as to enrich γ-aminobutyric acid an excessively drying step of excessively drying the grains after drying in the drying step a second humidification step of humidifying the grains after drying in the excessively drying step and a refining step of lowering the rigidity of the grains by infiltrating water adhering to the surface of the grains into the inside of the grains.COPYRIGHT: (C)2015,JPO&INPIT【課題】水分添加工程と乾燥工程とを繰り返すと、米粒表面に亀裂が入るという現象を活かしながら、γ-アミノ酪酸含有量を増加させつつ、デンプン単粒まで細かく粉砕することが可能な製粉前処理方法を提供する。【解決手段】原料穀粒を容器に張り込む原料供給工程と、前記容器内で穀粒に加湿を行う第1加湿工程と、該第1加湿工程での加湿後に前記穀粒を乾燥してγ―アミノ酪酸富化させる乾燥工程と、該乾燥工程での乾燥後に前記穀粒を過乾燥させる過乾燥工程と、該過乾燥工程での乾燥後の穀粒に加湿を行う第2加湿工程と、該第2加湿工程により前記穀粒の表面に付着させた水分を穀粒内部まで浸透させて穀粒の硬度を低下させる調質工程とを備えた。【選択図】図1
