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Analysis of biogenic amines (BAs) in different human samples provides insight into the mechanisms of various biological processes, including pathological conditions, and thus may be very important in diagnosing and monitoring several neurological disorders and cancerous tumors. In this work, we developed a simple and fast procedure using a digitally controlled microextraction in packed syringe (MEPS)...
The development of a field-amplified sample stacking technique is presented. Sensitivity enhancement in this technique was obtained by repetitive injections of a sample followed by steps of sample matrix removal through the application of counter-pressure. Under optimized conditions the background electrolyte (BGE) was composed of 80mM H 3 PO 4 while the sample matrix contained 0.5mM...
In this paper a comparative study of RP-LC column selectivity as obtained by the classification method of the Katholieke Universiteit Leuven (KUL method) and the selectivity obtained in real pharmaceutical analysis is reported. The separation of caffeine and its respective impurities was performed on 35 brands of stationary phases in accordance with the method prescribed in the European Pharmacopoeia...
A sensitive and rapid liquid chromatographic (LC) method for the simultaneous determination of testosterone (T) and epitestosterone (E) in human urine samples has been developed and elaborated. The ratio of the both steroids (T/E) in human urine is a widely used as doping control indicator. A sample pretreatment by solid-phase extraction (SPE) after hydrolysis using 36% hydrochloric acid for determination...
Recent reports from our laboratory presented a comprehensive theory and demonstrated feasibility of reversed-phase liquid chromatography (RP-LC) employing the programmed gradient of pH of the mobile phase. The aim of that work was to explore the usefulness of the pH gradient-based approach in fractionation of peptides. The experiments were performed on a series of peptides separated at various LC...
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