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- W2128469197 abstract "Microcalorimetry and high-performance liquid chromatography (HPLC) have been used to conduct a thermodynamic investigation of the reaction: {methyl ferulate(aq) + H2O(l) = methanol(aq) + ferulic acid(aq)}, as catalyzed by feruloyl esterase. Values of the apparent equilibrium constant K′ = (29.6 ± 0.7) (T = 298.15 K, citrate buffer at pH 4.98, ionic strength I = 0.39 mol · kg−1) and of the calorimetrically determined enthalpy of reaction ΔrH(cal) = (4.0 ± 0.9) kJ · mol−1 (T = 298.15 K and citrate buffer at pH 4.81, I = 0.36 mol · kg−1) were measured. A chemical equilibrium model, together with pKs and standard enthalpies of reaction ΔrH∘ for the H+(aq) binding reactions of the reactants and products, was then used to calculate the values K = (1.89 ± 0.06) · 10−4, ΔrH° = (7.3 ± 1.7) kJ · mol−1, ΔrG° = (21.25 ± 0.07) kJ · mol−1, and ΔrS° = − (46.8 ± 5.7) J · K−1 · mol−1 for the chemical reference reaction {methyl ferulate(aq) + H2O(l) = methanol(aq) + ferulic acid−(aq) + H+(aq)}. These values of K and ΔrH° are similar in magnitude to the corresponding values reported for the reaction {propyl gallate(aq) + H2O(l) = 3,4,5-trihydroxybenzoic acid−(aq) + 1-propanol(aq) + H+(aq)}. The results obtained in this study can be used in a chemical equilibrium model to calculate how K′ and other standard transformed properties such as the standard transformed enthalpy ΔrH′°, standard transformed Gibbs free energy ΔrG′°, and the change in binding of H+(aq), ΔrN(H+), vary with the independent variables T, pH, and I." @default.
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- W2128469197 date "2011-03-01" @default.
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- W2128469197 title "A calorimetric and equilibrium investigation of the reaction {methyl ferulate(aq)+H2O(l)=methanol(aq)+ferulic acid(aq)}" @default.
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- W2128469197 doi "https://doi.org/10.1016/j.jct.2010.09.002" @default.
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