International Journal of Analytical Chemistry / 2009 / Article / Tab 2

Research Article

New Sensitive Kinetic Spectrophotometric Methods for Determination of Omeprazole in Dosage Forms

Table 2

Kinetic parameters obtained from Benesi-Hildebrand, Arrhenius, and first-order linear plots of OMZ-acceptor CT complexes at the specific and reaction temperature.

Kinetic parametersIodine methodDDQ method

Correlation coefficient (r)0.99950.9999
Order of CT reaction (n)0.870.99
Specific rate constant, 5.4556.18
Activation energy, kcal mol−1 (Ea)−1.54−1.95
Activation entropy change, −69.96−66.44
Molar absorptivity, 21.126.89
Standard free energy change, −5.91−4.80
Association constant, 21.503.33

    : Negative sign of Ea indicates that the CT complex is decomposed by increasing temperature.

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