Abstract: Disclosed is a process for producing high-purity glucose by saccharifying liquefied starch with the aid of an enzyme, in which the saccharification reaction of the liquefied starch is discontinued at a point where the glucose content is less than 96% by weight, preferably within the range of 80 to 93% by weight, on a solid basis. The resulting saccharified solution is filtered, concentrated and softened as required, and then fractionated by subjecting it to column chromatography. Thereafter, the resulting glucose fraction is recovered. This process makes it possible to produce high-purity glucose efficiently in spite of a reduction in saccharification time.

Abstract: The present invention provides a process for production of starch sugars, wherein starch is subjected to liquefaction and saccharification to prepare a mixture containing 10-50% by weight, based on the total solid content, of glucose and 30-50% by weight, also based on the total solid content, of maltose and the mixture is concentrated so as to have a total solid content of 40-70% by weight; and the resulting mixture is subjected to component separation using a chromatographic separator of simulated moving bed type capable of fractionating the mixture into at least three fractions, to produce a glucose fraction with a glucose purity of at least 97% by weight, a maltose fraction with a maltose purity of at least 80% by weight and a high-purity oligosaccharide fraction at a high efficiency in one operation.