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2 Polish Journal of Chemical Technology

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Modeling of the influence of the modifier concentration on the retention process in NP-HPLC

Zapała W.

Polish Journal of Chemical Technology

2008

Vol. 10, nr 1

52-56

The adsorption model for an accurate prediction of the analyte retention in the normal - phase liquid chromatography with a binary mobile phase has been proposed. This model was derived using a thermodynamically consistent modified competitive Langmuir isotherm. The performance of the proposed equation was compared with two retention models reported in literature. All models were verified for different NP-LC systems by use of three criteria: the sum of squared differences between the experimental and theoretical data, approximation of the standard deviation and the Fisher test.

The influence of the mobile phase composition on the sorption equilibrium in different HPLC systems

Zapała W.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 3

144-146

The influence of the mobile phase composition on the equilibrium of the sorption process in different normal and reversed overloaded chromatographic systems has been studied. Two different equations for the description of isotherm parameters of a given solute as a function of the mixed mobile phase composition were proposed. Both models were thoroughly tested in the experiments using many different chromatographic systems. All models were verified by the use of three criteria: the sum of the squared differences between the experimental and theoretical data, approximation of the standard deviation and the Fisher test. All the computation results obtained confirm the fine performance of the proposed equations. The models give good fitting results, accuracy and great applicability. The proposed models can be used for the numerical simulations of the peak profiles and the optimisation of the effects of the mobile phase on the yield, purity and production rate under overloaded isocratic conditions in the preparative liquid chromatography.