alexa Chemometric of the retention mechanism on butyl column: effect and relation of pH and pKa.
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): Kouskoura MG, Mitan CV, Markopoulou CK, Kouskoura MG, Mitan CV, Markopoulou CK

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Abstract Reversed phase chromatographic separations are optimized for analytes containing ionizable groups by adjustment of pH of mobile phases. As it seems the pK(a). values of compounds affect their retention because of the variety in their solvation. However, it is of stressful need to predict their behavior taking into account also a series of other parameters. This work focuses on the development of ten different models, using partial least squares regression, which will identify and quantify the impact of several factors in the chromatographic behavior of 104 analytes. The combined effect of their numerous characteristics is obvious since along with pH (at 2.3 and 6.2), factors such as lipophilicity, molecular volume, polar surface area and the presence of specific moieties in their structures are not diminished. On the contrary, they work increasing or counterbalancing several effects on the retention time. The models compiled can be applied to predict with reliability (R2 > 0.865 and Q2 > 0.777) the behavior of unknown drugs.
This article was published in Se Pu and referenced in Journal of Chromatography & Separation Techniques

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