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Reversal of elution order for profen acid enantiomers in packed‐column SFC on Chiralpak AD
Author(s) -
Gyllenhaal Olle,
Stefansson Morgan
Publication year - 2005
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20160
Subject(s) - chemistry , flurbiprofen , chromatography , elution , enantiomer , supercritical fluid chromatography , naproxen , methanol , selectivity , packed bed , high performance liquid chromatography , organic chemistry , catalysis , medicine , alternative medicine , pathology , pharmacology
Enantiomeric separations of four 2‐substituted propionic acid drugs have been studied using packed‐column supercritical fluid chromatography (SFC) with amylose tris(3,5‐dimethylphenylcarbamate) coated on silica as support (Chiralpak AD). Under standard conditions (i.e., flow rate, 1.5 ml/min; column temperature, 30°C; back‐pressure, 150 bar), the order of elution could be reversed when the polar alcohol modifier methanol in carbon dioxide was replaced by 2‐propanol for ibuprofen, ketoprofen, and naproxen. For flurbiprofen, with the highest selectivity factor, no reversal was observed, although selectivity was reduced significantly with higher alcohols. Naproxen and flurbiprofen were also investigated with 2‐butanol and 2‐pentanol. The former showed reversal of elution order but not the latter. For higher alcohol modifiers, including 2‐propanol, the peak symmetry was poor but could be improved by addition of citric acid in the alcohol modifier. These results stress the importance to investigate enantiomer elution order during the development of enantioselective methods and when chromatographic conditions are optimized. Preliminary experiments with column temperatures over the range of −15 to 45°C revealed that, in a few cases, reversal took place with a change in temperature only. Chirality 17:257–265, 2005. © 2005 Wiley‐Liss, Inc.