PROBLEM TO BE SOLVED: To provide a method for producing oligosaccharides with good efficiency.SOLUTION: One embodiment of a method for producing oligosaccharides includes a treatment liquid preparation step S10 for mixing polysaccharides with 10 or more monosaccharide molecules bound together and water to prepare a treatment liquid, an ozone generation step S20 that generates ozone from oxygen with a nitrogen concentration of 1 vol.% or more and less than 20 vol.%, and a molecular weight reduction step S30 for gas-liquid mixing the treatment liquid and the ozone.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】効率の良いオリゴ糖の製造方法を提供する。【解決手段】実施形態のオリゴ糖の製造方法は、炭糖分子が10個以上結合した多糖を、水と混合し、処理液を調製する処理液調製工程S10と、窒素濃度が1体積%以上20体積%未満の酸素、からオゾンを生成するオゾン生成工程S20と、前記処理液と前記オゾンとを気液混合する低分子化工程S30と、を具備する。【選択図】図2
