Method for manufacturing allulose

A method for producing allulose, the method comprising the steps of:

• obtaining an invert sugar syrup containing fructose and glucose by treating a raw material for sucrose production containing sucrose with an invertase, without separating or purifying sucrose crystal from the raw material for sucrose production,
• preparing a fructose-rich feedstock for allulose production by subjecting the invert sugar syrup into a fructose separation process, and
• performing an allulose conversion reaction using the fructose-rich feedstock,
• wherein the raw material for sucrose production is juice or concentrate of sugar cane, juice or concentrate of sugar beet, a crystal obtained by removing molasses from the juice or the concentrate, or a solution of the crystal, and
• wherein the fructose-rich feedstock contains 90 wt % or more fructose based on the total saccharide solid content of the fructose-rich feedstock,
• wherein the fructose separation process comprises an activated carbon treatment step, an ion purification step, a high-purity separation step using simulated moving bed (SMB) chromatography, and a concentration step for the invert sugar syrup.