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Sampling of persistent organic compounds using SPMDs: Advantages and disadvantages
Čáslavský, Josef ; Kotlaříková, Pavla ; Benešová, Karolína ; Doškářová, Š. ; Hamrusová, M.
Passive sampling methods gain more and more popularity for the sampling of persistent organic pollutants in the environment, including air. These passive samplers are substantially cheaper than standard active sampling methods, their deployment is simpler, they don't need electricity, thus they can be deployed even in very distant regions. They offer an itegrative response, therefore these samplers are especially suitable for monitoriong purposes. For quantitative evaluation it is necessary to establish the values of sampling rates for individual compounds. In the presented study these values for polycyclic aromatic hydrocarbons were evaluated from the comparison of the results of passive sampling using SPMDs and standard active sampling method.
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Influence of the laser power and analyte concentration on the results in MALDI-TOF MS of oligosaccharides
Čáslavský, Josef ; Chmelík, Josef
MALDI-TOF MS has been successfully applied for the analysis of a wide range of organic biopolymers including oligosaccharides. We focus our attention to the group of oligosaccharides occuring in beer and in malting and mashing products, which are mainly oligosaccharides containing from 3 to more than 30 glucose units in their molecules. We tried to evaluate various factors influencing the obtained results. We found that the shape of the spectrum depends significantly on the energy of ionising laser pulse and also on the amount of the analyte on the MALDI target. These effects were studied with standard mixtures as well as with real samples.
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