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  • Separation of (R)- and (S)-naproxen using micellar chromatography and an alpha 1-acid-glycoprotein column: application for chiral monitoring in human liver microsomes by coupled-column chromatography.

Separation of (R)- and (S)-naproxen using micellar chromatography and an alpha 1-acid-glycoprotein column: application for chiral monitoring in human liver microsomes by coupled-column chromatography.

Journal of biochemical and biophysical methods (1992-12-01)
D Haupt, C Pettersson, D Westerlund
ABSTRACT

A column-switching system for fast determination of (R)- and (S)-naproxen in liver microsomes has been developed. The centrifuged sample was injected directly onto a pre-column with octadecylcoated silica. The retained analytes were then directed to an alpha 1-AGP column using a mobile phase composed of phosphate buffer (pH 6.5), dimethylocytylamine (30 mM) and the nonionic surfactant, Tween 20 (40 g/l). The method gave high absolute recoveries and good repeatabilities: 99.6% (1.7% relative standard deviation) and 94.9% (2.4% R.S.D.) for the (R)- and (S)-naproxen, respectively. The use of a surfactant in combination with an aliphatic amine in the mobile phase involves reduced retention times with retained enantioselectivity. Furthermore, the presence of the surfactant makes it possible to inject biological samples directly into the chromatographic system.

MATERIALS
Product Number
Brand
Product Description

Supelco
Naproxen, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Naproxen, meets USP testing specifications
Sigma-Aldrich
(S)-(+)-6-Methoxy-α-methyl-2-naphthaleneacetic acid, 98%
Supelco
Naproxen, VETRANAL®, analytical standard
Naproxen, European Pharmacopoeia (EP) Reference Standard