Abstract
Alkaloids can be separated as cations on ion-exchange material. In contrast with silica-based ion-exchangers, bare alumina can be packed into columns with high permeability and efficiency yielding symmetrical peaks. By using mixed aqueous—organic mobile phases, the selectivity of the system can be enhanced and manipulated in order to optimize separations. Chromatograms of illicit heroin and opium samples illustrate the applicability of the technique.
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