Resolution of chiral pollutants

As in the case of GC and HPLC, a chiral selector is also required in CE for enantiomeric resolution. In general, chiral compounds are used in background electrolyte (BGE) as additives, and hence they are called chiral selectors or chiral BGE additives. There are only a few publications available that deal with chiral resolution on a capillary coated with a chiral selector in CE [4]. The enantiomeric resolution of chiral pollutants discussed in this chapter has been confined to the use of chiral selectors in the BGE. As a chiral resolution technique, CE has been used widely for the enantiomeric resolution of dmgs and pharmaceuticals [5]. Several reviews have also appeared on this issue, and they describe the use of many chiral compounds as chiral BGE additives [6-13]. The most commonly used chiral BGE additives are cyclodextrins, macrocyclic glycopeptide antibiotics, proteins, crown ethers, ligand exchangers, alkaloids [6-16] and so on. The structures and properties of these chiral BGE additives have been described in previous chapters and, therefore, this aspect will not be discussed here again. However, a list of these chiral BGE additives is presented in Table 9.1. a-, and y-Cyclodextrins and their derivatives have been used frequently in chiral CE, because of their water solubility... 

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