Optimisation of multilinear gradient elutions in reversed-phase liquid chromatography using ternary solvent mixtures.
The multilinear gradient elution theory for binary mobile phases in reversed-phase liquid chromatography presented in [P. Nikitas, A. Pappa-Louisi, A. Papageorgiou, J. Chromatogr. A 1157 (2007) 178] is extended to ternary gradients. For the evaluation of this theory and the performance of the various fitting and optimisation algorithms we used 13 o-phthalaldehyde (OPA) derivatives of amino acids with mobile phases modified by acetonitrile and methanol. It is shown that the theory can lead to high quality predictions of the retention times under gradients elutions and optimisation of ternary gradients provided that we use a six-parameter expression for the logarithm of the retention factor, lnk, and the adjustable parameters of this expression are determined from ternary isocratic data.
Pappa-Louisi
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A
Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. apappa@chem.auth.gr
Nikitas
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P
Papageorgiou
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A
D000097:Acetonitriles / Q000737:chemistry; D000596:Amino Acids / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D000432:Methanol / Q000737:chemistry; D008962:Models, Theoretical; D012997:Solvents / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
D000097:Acetonitriles; D000596:Amino Acids; D012997:Solvents; D000432:Methanol; C032159:acetonitrile