| Abstrakt: |
We developed a new method for chiral separation of fourteen amino alcohols by nonaqueous capillary electrophoresis (NACE) with the D-(+)-gluconic acid δ-lactone-boric acid complex as chiral selector. In order to achieve good enantioseparation, the effects of D-(+)-gluconic acid δ-lactone and boric acid concentrations, triethylamine concentration, as well as capillary temperature were systematically investigated. The optimized conditions were identified as follows: an uncoated fused silica capillary of 50 μm ID with a total length (L(tot)) of 55 cm and an effective length (L(eff)) of 45 cm; 200 mmol·L(-1) D-(+)-gluconic acid δ-lactone, 80 mmol·L(-1) boric acid, and 57.4 mmol·L(-1) triethylamine in methanol; positive pressure injection at 2.9 psi for 2 s; capillary temperature, 25 ± 0.2 ℃; applied voltage, +15 k V; detection wavelength, 214 nm. Under the optimized conditions, a good chiral resolution was achieved in most of the tested drugs. This method provides a foundation for the development and application of new chiral selectors of polyhydroxy compound-boric acid complexes in chiral drugs analysis by NACE. |
