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Determination of the thermodynamic dissociation constant of capecitabine using spectrophotometric and potentiometric titration data
Authors: Meloun Milan | Ferenčíková Zuzana | Vrána Aleš
Year: 2011
Type of publication: článek v odborném periodiku
Name of source: Journal of Chemical Thermodynamics
Publisher name: Academic Press (Elsevier)
Page from-to: 930-937
Titles:
Language Name Abstract Keywords
cze Stanovení termodynamické diosciační konstanty capecitabinu analýzou spektrofotometrických a potenciometrických dat Capecitabine byl studován potenciometrickou a spektrofotometrickou titrací při 25C a 37C a rozličných iontových silách. Vedle termodynamických disociačních konstant byly vyčísleny také termodynamické parametry deltaH a deltaS, které ukazují, že disociace není spontánní proces. Potenciometrická titrace;disociační konstanta;capecitabin;SPECFIT;SQUAD;ESAB2M;HYPERQUAD
eng Determination of the thermodynamic dissociation constant of capecitabine using spectrophotometric and potentiometric titration data Capecitabine has been studied by a combined potentiometric and spectrophotometric titration at T = (298.15, 310.15) K at different ionic strengths. The thermodynamic dissociation constant was estimated by non-linear regression of (pK(a), I) data: pK(a)(T) = 8.97(1) at T = 298.15 K and pK(a)(T) = 8.74(0) at T = 310.15 K, where the figure in the brackets is the standard deviation in last significant digits. Thermodynamic parameters Delta H degrees/kJ.mol(-1) and Delta S degrees/J.K-1.mol(-1) have been determined from the temperature variation of thermodynamic dissociation constants. The value of enthalpy Delta H degrees = 33.9 kJ.mol(-1) shows the dissociation process is endothermic and the value of entropy Delta S degrees = -51.9J.K-1.mol(-1) indicates that the dissociation is not a spontaneous process. Spectrophotometric titration;Potentiometric titration;Dissociation constant;Capecitabine;SPECFIT;SQUAD;ESAB2M;HYPERQUAD

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