Optimization of separation in TLC by use of desirability functions and ...
Optimization of separation in TLC by use of desirability functions and ...
Optimization of separation in TLC by use of desirability functions and ...
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Scopus - Journal <strong>of</strong> Planar Chromatography - Modern <strong>TLC</strong>: <strong>Optimization</strong> <strong>of</strong> <strong>separation</strong> <strong>in</strong> <strong>TLC</strong> <strong>by</strong> <strong>use</strong> <strong>of</strong> desirabilit...<br />
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Journal <strong>of</strong> Planar Chromatography - Modern <strong>TLC</strong><br />
Volume 12, Issue 5, September 1999, Pages 365-372<br />
Document Type: Article<br />
References (22)<br />
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<strong>Optimization</strong> <strong>of</strong> <strong>separation</strong> <strong>in</strong> <strong>TLC</strong> <strong>by</strong> <strong>use</strong> <strong>of</strong> <strong>desirability</strong> <strong>functions</strong><br />
<strong>and</strong> mixture designs accord<strong>in</strong>g to the 'PRISMA' method<br />
Pel<strong>and</strong>er, A. a , Summanen, J. b , Yrjönen, T. b , Haario, H. c , Ojanperä, I. a , Vuorela, H. b<br />
a Department <strong>of</strong> Forensic Medic<strong>in</strong>e, P.O. Box 40, FIN-00014 Hels<strong>in</strong>ki, F<strong>in</strong>l<strong>and</strong><br />
b Division <strong>of</strong> Pharmacognosy, Department <strong>of</strong> Pharmacy, P.O. Box 56, FIN-00014 Hels<strong>in</strong>ki, F<strong>in</strong>l<strong>and</strong><br />
c Department <strong>of</strong> Mathematics, P.O. Box 4, FIN-00014 Hels<strong>in</strong>ki, F<strong>in</strong>l<strong>and</strong><br />
Abstract<br />
A computer program has been developed for optimization <strong>of</strong> mobile phase<br />
composition <strong>in</strong> th<strong>in</strong>-layer chromatography (<strong>TLC</strong>). The <strong>desirability</strong> function<br />
technique comb<strong>in</strong>ed with the 'PRISMA' model was <strong>use</strong>d to enhance the<br />
quality <strong>of</strong> <strong>TLC</strong> <strong>separation</strong>s. The statistical models for prediction <strong>of</strong><br />
retardation <strong>and</strong> b<strong>and</strong>-broaden<strong>in</strong>g at different mobile phase compositions<br />
obta<strong>in</strong>ed <strong>by</strong> the PRISMA method were exam<strong>in</strong>ed for cyanobacterial<br />
hepatotox<strong>in</strong>s on normal-phase <strong>TLC</strong> plates <strong>and</strong> for phenolic compounds on<br />
reversed-phase (RP) layers. The study showed that the relationship between<br />
mobile phase composition <strong>and</strong> retardation <strong>of</strong> the test mixtures can be<br />
expressed with high accuracy <strong>by</strong> <strong>use</strong> <strong>of</strong> quadratic regression models. The<br />
retardation was described <strong>by</strong> k(c) = 1/(R(F) 1) <strong>and</strong> the b<strong>and</strong>-broaden<strong>in</strong>g <strong>in</strong><br />
terms <strong>of</strong> the b<strong>and</strong> width at the half-height <strong>of</strong> the peak (w(h)). The models<br />
obta<strong>in</strong>ed were <strong>use</strong>d to predict the resolution (R(s)) for different solvent<br />
comb<strong>in</strong>ations. The <strong>desirability</strong> function converted the calculated R(s) value<br />
<strong>in</strong>to the <strong>desirability</strong> value (D) <strong>and</strong> the overall optimum was then def<strong>in</strong>ed <strong>by</strong><br />
the overall <strong>desirability</strong>. The optimum mobile phase mixtures for the<br />
<strong>separation</strong> were obta<strong>in</strong>ed as a contour plot <strong>in</strong>side the horizontal plane <strong>of</strong> the<br />
PRISMA model <strong>and</strong> good <strong>separation</strong> was achieved <strong>by</strong> <strong>use</strong> <strong>of</strong> the optimized<br />
solvent comb<strong>in</strong>ation. Depend<strong>in</strong>g on the objective for which the optimum<br />
<strong>separation</strong> is be<strong>in</strong>g <strong>in</strong>vestigated, the program enables either optimization <strong>of</strong><br />
critical pairs or determ<strong>in</strong>ation <strong>of</strong> the overall optimum <strong>in</strong> which the <strong>in</strong>tention<br />
is reasonable <strong>separation</strong> <strong>of</strong> as many compounds as possible.<br />
Author Keywords<br />
'PRISMA' model; Desirability function; Normal phase; <strong>Optimization</strong>;<br />
Reversed phase; <strong>TLC</strong><br />
Select: All<br />
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Pel<strong>and</strong>er, A.; Department <strong>of</strong> Forensic Medic<strong>in</strong>e, University <strong>of</strong> Hels<strong>in</strong>ki, P.O. Box 40, FIN-00014 Hels<strong>in</strong>ki, F<strong>in</strong>l<strong>and</strong>;<br />
© Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.<br />
Journal <strong>of</strong> Planar Chromatography - Modern <strong>TLC</strong><br />
Volume 12, Issue 5, September 1999, Pages 365-372<br />
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