PROBLEM TO BE SOLVED: To provide a process for the production of low-lactose and lactose-free milk products without any extra costs, the process enabling a more efficient and simpler control of milk components at minimum costs, and requiring no separate addition of water.SOLUTION: Provided is a process for the production of a lactose-free or a low-lactose milk product, the process comprising a) adding a lactase enzyme into a milk raw material to completely or partially hydrolyze the lactose in the milk raw material, b) ultrafiltrating (UF) the hydrolyzed milk raw material to condense the proteins in the UF retention so as to obtain a UF permeate containing sugars, c) nanofiltrating (NF) the UF permeate such that the NF retention containing sugars and the NF permeate containing minerals are separated, and d) composing a lactose-free or a low-lactose milk product from the UF retention obtained by the step b) and the NF permeate obtained by the step c).SELECTED DRAWING: None【課題】特別な余計なコストがかからず、最小限のロスで、より効率的に、より単純な乳成分の調節を可能にし、水を別途添加しない、低乳糖及び無乳糖乳製品並びにその製造方法の提供。【解決手段】ａ）乳原料にラクターゼ酵素を加えて該乳原料の完全に又は部分的に乳糖加水分解を行い、ｂ）該乳原料を限外ろ過（ＵＦ）して、タンパク質をＵＦ保持物中に濃縮し、糖類を含有するＵＦ通過物を得て、ｃ）ＵＦ通過物をナノろ過（ＮＦ）して、ＮＦ保持物中に糖類を、ＮＦ通過物中にミネラルを分離し、ｄ）工程ｂ）で得られたＵＦ保持物および工程ｃ）で得られたＮＦ通過物から無乳糖または低乳糖乳製品を構成することを含む、無乳糖または低乳糖乳製品の製造方法。【選択図】なし
