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- W25693774 abstract "The retention of d,l-tryptophan enantiomers on an immobilized teicoplanin column was investigated in relation to the mobile phase sodium perchlorate concentration using the perturbation method to determine the solute distribution isotherms. From the experimental data, it appeared that the bi-Langmuir model was able to describe d- and l-enantiomer retention on the immobilized selector over the salt concentration range. An increase in the apparent enantioselectivity with an increase in sodium perchlorate concentration was observed. The chiral recognition enhancement was governed by (i) an increase in the difference of the adsorption constants for binding to the high-affinity site (aglycone pocket) between the two enantiomers and (ii) enhancement of the number of aglycone chiral regions interacting with d-tryptophan. It is suggested that an ion-pair formation mechanism between perchlorate and solute and/or selector is responsible for this behavior. In addition, this work shows that additional secondary sites on the teicoplanin surface are involved in the apparent enantioselectivity at low sodium perchlorate concentrations." @default.
- W25693774 created "2016-06-24" @default.
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- W25693774 date "2003-01-01" @default.
- W25693774 modified "2023-09-24" @default.
- W25693774 title "Study of tryptophan enantiomer binding to a teicoplanin-based stationary phase using the perturbation technique" @default.
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- W25693774 doi "https://doi.org/10.1016/s0021-9673(02)01952-0" @default.
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