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• W2076752489 abstract "The potential of tert.-butylcarbamoylquinine as chiral selector (SO) added to a non-aqueous background electrolyte for the capillary electrophoretic separation of the enantiomers of N-derivatized amino acids (selectands, SAs) is evaluated. Separation is based on different ion-pair formation equilibrium constants of (R) and (S) enantiomers of the negatively charged chiral analytes with the positively charged quinine-derived chiral SO and on mobility differences of free and complexed SAs, so that differences in the overall migration behavior of the SA enantiomers result. To suppress problems associated with the high UV absorption of the chiral SO and thus the high detector background in the 'total filling technique', the 'partial filling technique' has been adopted. Several parameters including filling time and length of SO zone, respectively, SO concentration, type of background electrolyte, have been evaluated. Using such an optimized method, for example, (R) and (S) enantiomers of 2,4-dinitrophenyl (DNP)-protected proline could be separated with alpha=1.08, R(S)=6.60, and N=130,000 theoretical plates within 15 min. Similar alpha values, resolution, and efficiencies were observed for other DNP-protected, as well as for diverse, N-derivatized amino acids like N-benzoyl, N-9-fluorenylmethoxycarbonyl, N-3,5-dinitrobenzyloxycarbonyl amino acids. A repeatability study clearly validated the robustness of the method and revealed its practical applicability." @default.
• W2076752489 created "2016-06-24" @default.
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• W2076752489 date "2000-09-01" @default.
• W2076752489 modified "2023-10-12" @default.
• W2076752489 title "tert.-Butylcarbamoylquinine as chiral ion-pair agent in non-aqueous enantioselective capillary electrophoresis applying the partial filling technique" @default.
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• W2076752489 doi "https://doi.org/10.1016/s0021-9673(00)00172-2" @default.
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