Human saliva is one of the body fluids which collection method is relatively simple and non‐invasive. The article is dedicated to assess concentration (activity) of Na+, K+, Ca2+, Mg2+ and Cl− in fresh, unstimulated or stimulated human saliva samples using single solid contact ion‐selective electrodes with conventional reference electrode and self‐made multisensor platform (MP) equipped with ion‐selective membranes for Na+, K+, Ca2+, Mg2+ and Cl− and reference electrode made in solid state technology, based on dispersed KCl in the polymer. Both kind of electrodes, single ISE and miniaturized electrodes in multisensor platform (ISE‐MP) were made of glassy carbon. The electrode surfaces have been modified by conductive polymer (PEDOT) layer deposition; with the exception of Cl− electrode, in which conducting polymer was not applied. Potentiometric measurements were used to compare the changes of the ionic composition in various samples of saliva.
International audiencep-tert-Butylcalix[4]arenes, in the cone conformation, di- and tetrasubstituted at the narrow rim with charged phosphonium groups, have been synthesized and characterized. Their interactions with a wide range of anions have been investigated in solution in chloroform and acetonitrile by means of 1H and 31 P NMR and microcalorimetry (ITC). These compounds have also been incorporated as sensing material in PVC ion selective electrodes (ISE). The results showed that they interact strongly with the more lipophilic anions ClO4-, SCN- and I-, in solution as in the electrode membranes. The origin of this selectivity is discussed and, in particular, the role of the salt counterion is examined
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