Shiro Kishihara

Simultaneously Continuous Separation of Glucose, Maltose, and Maltotriose Using a Simulated Moving-Bed Adsorber

Simultaneously Continuous Separation of Glucose, Maltose, and Maltotriose Using a Simulated Moving-Bed Adsorber Kyu Beom Kim, Shiro Kishihara & Satoshi Fujii To cite this article: Kyu Beom Kim, Shiro Kishihara & Satoshi Fujii (1992) Simultaneously Continuous Separation of Glucose, Maltose, and Maltotriose Using a Simulated MovingBed Adsorber, Bioscience, Biotechnology, and Biochemistry, 56:5, 801-802, DOI: 10.1271/ bbb.56.801 To link to this article: http://dx.doi.org/10.1271/bbb.56.801

Molecular and crystal structure of galactinol dihydrate [1-O-(α-d-galactopyranosyl)-myo-inositol dihydrate]

The crystal structure of galactinol dihydrate has been determined by X-ray diffraction. The crystal belongs to the orthorhombic system, space group P2(1)2(1)2, a = 15.898(6), b = 19.357(5), c = 5.104(4) A, and Z = 4. The structure was refined to R = 0.044 for 1818 observed structure amplitudes. The primary hydroxyl group exhibits twofold orientational disorder. The linkage conformation is close to those of alpha-(1 --> 4) linkages in methyl alpha-maltotrioside tetrahydrate and erlose trihydrate. Although there is no interring hydrogen bond in galactinol, an indirect interring hydrogen bond including a water molecule is present. The observed conformation is additionally stabilized by the indirect interring hydrogen bond. The global minimum in the relaxed-residue energy map based on the MM3(92) force-field is close to the observed conformation in the crystal structure. All hydroxyl, ring and water oxygen atoms are involved in a complex three-dimensional hydrogen-bonding network.