title: Hydrolysis kinetics of trisaccharides consisting of glucose, galactose, and fructose residues in subcritical water.
abstract: The hydrolysis kinetics of trisaccharides consisting of glucose, galactose, and fructose residues with different glycosidic bonds, 1-kestose, d-melezitose, d-raffinose, and lactosucrose, in subcritical water were conducted over the temperature range of 150-230 degrees C and at a constant pressure of 10 MPa. The hydrolysis of trisaccharides in subcritical water proceeded consecutively, i.e., one cleavage of the two bonds antedated the other. The preceding cleavage was not expressed by the first-order kinetics, but by the kinetics considering the concentration of the acidic compounds, which were produced by the degradation of the constituent monosaccharides. The hydrolysis of the constituent disaccharides, except sucrose composed of the alpha-Glc-(1-->2)-beta-Fru bond, obeyed first-order kinetics. All of the rate constants of the hydrolytic kinetics were determined, and the values were found to depend on the type of bond.
authors.affiliation: Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Shabnam Haghighat
authors.initials: SH
authors.lastname: Khajavi
authors.forename: Shuji
authors.initials: S
authors.lastname: Ota
authors.forename: Risa
authors.initials: R
authors.lastname: Nakazawa
authors.forename: Yukitaka
authors.initials: Y
authors.lastname: Kimura
authors.forename: Shuji
authors.initials: S
authors.lastname: Adachi
mesh_terms: D001709:Biotechnology / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D004187:Disaccharides / Q000737:chemistry; D005632:Fructose / Q000737:chemistry*; D005690:Galactose / Q000737:chemistry*; D005947:Glucose / Q000737:chemistry*; D006868:Hydrolysis; D007700:Kinetics; D008956:Models, Chemical; D011312:Pressure; D013379:Substrate Specificity; D013696:Temperature; D013997:Time Factors; D014312:Trisaccharides / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D004187:Disaccharides; D014312:Trisaccharides; D014867:Water; D005632:Fructose; D005947:Glucose; D005690:Galactose