Ahn HY, Shiu GK, Trafton WF, Doyle TD. Resolution of the enantiomers of ibuprofen; comparison study of diastereomeric method and chiral stationary phase method.
J Chromatogr B Biomed Appl 1994;
653:163-9. [PMID:
8205243 DOI:
10.1016/0378-4347(93)e0425-p]
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Abstract
In this study, an indirect diastereomeric method and a direct method utilizing a chiral stationary phase (CSP) were investigated for the resolution of ibuprofen enantiomers. In the indirect method, ethylchloroformate (ECF) and 2-ethoxy-1-1-ethoxycarbonyl-1,2-dihydroquinoline (EEDQ) were utilized as first-step derivatizing reagents in acetonitrile or toluene. In the direct CSP method, ibuprofen enantiomers were derivatized to p-nitrobenzyl ureides and then resolved on an (R)-(-)-(1-naphthyl)ethylurea CSP column. The derivatization procedure took place in 10 min with an overall inversion efficiency of 90.3%. Racemization was not observed under the derivatization conditions used. The HPLC-CSP method was utilized to study the pharmacokinetics of ibuprofen enantiomers in dog plasma after a single oral administration of 200 mg of ibuprofen racemate.
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