Thermodynamics of the hydrolysis reactions of 1,4-beta-D-xylobiose, 1,4-beta-D-xylotriose, D-cellobiose, and D maltose

Published

October 1, 2008

Author(s)

Yadu D. Tewari, Brian E. Lang, Stephen R. Decker, Robert N. Goldberg

Abstract

Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions: 1,4--D-xylobiose(aq) + H2O(l) = 2 D-xylose(aq), (1) 1,4--D-xylotriose + 2 H2O(l) = 3 D-xylose(aq), (2) D-maltose(aq) + H2O(l) = 2 -D-glucose(aq), (3) D-cellobiose(aq) + H2O(l) = 2 -D-glucose(aq). (4) The results of the equilibrium measurements were K = (1.46 ± 0.15)∙103 for reaction (1) and K = 551 ± 34 for reaction (3).  Although it was not possible to measure a value for the equilibrium constant for reaction (4), it was possible to obtain the value K = 657 for this reaction via a thermochemical cycle calculation.  Selected property values from this reaction catalog were then used to calculate best values of the standard molar Gibbs free energy of formation fGm, the standard molar enthalpy of formation fHm, the standard molar entropy Sm, and the standard molar heat capacity Cp,m for the substances of interest to this investigation.

Citation

Journal of Chemical Thermodynamics

Volume

40

Issue

10

Pub Type

Journals

Citation

Tewari, Y. , Lang, B. , Decker, S. and Goldberg, R. (2008), Thermodynamics of the hydrolysis reactions of 1,4-beta-D-xylobiose, 1,4-beta-D-xylotriose, D-cellobiose, and D maltose, Journal of Chemical Thermodynamics (Accessed December 5, 2024)