In order to determine the chemical composition distribution (CCD) of styrene-butadiene copolymers, gradient polymer elution chromatography has been performed. The separation is mainly based on differences in solubility among the copolymer molecules with different chemical composition. The solubility of a copolymer is dependent on the following parameters: temperature, type of solvent/non-solven...

PURPOSE The paper describes some thin layer chromatographic procedures that allow simple and rapid separation and identification of penicillins and cephalosporins from complex mixtures. METHODS Using silicagel GF254 as stationary phase and selecting different mobile phases we succeeded in the separation of the studied beta-lactamins. Our aim was not only to develop a simple, rapid and efficie...

s. Acevska J, Stefkov G, Petkovska R, Kulevanova S, Dimitrovska A. Chemometric approach for development, optimization, and validation of different chromatographic methods for separation of opium alkaloids. Anal Bioanal Chem. 2012 May;403(4):1117-29. Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, University Ss. Cyril and Methodius, Skopje, Republic of Macedonia....

Plasmalogens are a unique subclass of glycerophospholipids characterized by the presence of a vinyl ether bond at the sn-1 position of the glycerol backbone, and they are found in high concentration in cellular membranes of many mammalian tissues. However, separation of plasmalogens as intact phospholipids has not been reported. This article describes a high-performance liquid chromatographic m...