CRYSTAL OF L-PSICOSE, METHOD FOR PRODUCING THE SAME, AND SACCHARIDE REAGENT KIT

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PROBLEM TO BE SOLVED : To provide a crystal of L-psicose, to establish a method for mass-producing the crystal, and to provide a use of the crystal of the L-psicose (reagent kit containing the same). SOLUTION : The crystal of the L-psicose is provided. The crystal of the L-psicose has angles of diffraction (2[!theta!]) of 15.2°, 18.8°, and 19.5° as main angles in powder X-ray diffractometry. The crystal of the L-psicose is provided by forming the crystal of the L-psicose out of a high concentration saccharide solution containing the L-psicose, and then collecting the crystal. Water or a mixed liquid of the water and ethanol is used as a solvent of the saccharide solution of which the crystal is formed out. A saccharide solution which is obtained by production processes including a step for acting acetic bacteria on allitol and converting the allitol into the L-psicose is used as the saccharide solution containing the L-psicose. The method for producing the crystal of the L-psicose comprises forming a large amount of the crystal of the L-psicose out of the saccharide solution containing the crystal of the L-psicose and the L-psicose, and then collecting the crystal. A rare saccharide reagent kit contains at least the crystal of the L-psicose as a reagent.