Capillary electrophoretic separation of tricyclic antidepressants using charged carboxymethyl‐β‐cyclodextrin as a buffer additive

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Abstract
Charged carboxymethyl-β-cyclodextrin was successful in the capillary electrophoretic separation of a series of tricyclic antidepressants. The cyclodextrin alone was successful in the separation of carbamazepine, protriptyline, desipramine, clomipramine, and opipramol using a 3-(trimethoxysilyl)propyl methacrylate capillary coating to reduce the electroosmotic flow. The ideal buffer pH was found to be in the range of 6–7 and the ideal cyclodextrin concentration to be 10 mM. All nine antidepressants were resolved using the charged cyclodextrin in the micellar electrokinetic chromatography (MEKC) mode with sodium dodecyl sulfate as the surfactant. Neither the cyclodextrin nor the surfactant alone were successful in resolving the whole series of compounds under investigation but a combination of both produced the separation. Separations were performed on a linear polyacrylamide coated capillary. The ideal pH of the buffer was in the range of 5–7.

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