dc.contributor.author | Banica, Florinel Gabriel | nb_NO |
dc.contributor.author | Kafar, Beata | nb_NO |
dc.contributor.author | Skrzypek, Slawomira | nb_NO |
dc.contributor.author | Ciesielski, Witold | nb_NO |
dc.date.accessioned | 2014-12-19T13:20:32Z | |
dc.date.available | 2014-12-19T13:20:32Z | |
dc.date.created | 2007-11-19 | nb_NO |
dc.date.issued | 2006 | nb_NO |
dc.identifier | 122991 | nb_NO |
dc.identifier.issn | 1040-0397 | nb_NO |
dc.identifier.uri | http://hdl.handle.net/11250/247431 | |
dc.description.abstract | Selenomethionine (SeMet) is a catalyst for Ni(II) reduction at a mercury electrode in a borax buffer at pH around 9 and gives rise to a differential pulse voltammetric peak, A, at -0.74 V vs. the Ag|AgCl, (3 M KCl) reference electrode. Peak current is directly proportional to SeMet over the concentration range 0.4–10 µM. Alkali and alkali-earth ions depress to some extent the sensitivity but the current-concentration relationships remains linear even under these conditions. Differential pulse cathodic stripping voltammetry (DPCSV) in 0.01 M borax results in two partially overlapped peaks. The more negative (A, at about -0.74 V) is similar to that recorded with no deposition and is due to the catalysis by non-adsorbed SeMet, whereas the more positive one (B, at about –0.60 V) results from the catalysis by adsorbed SeMet. Only the DPCSV peak A appears if 0.1 M KNO3 is also present along with 0.01 M borax. Stearic acid, which is present in nutritional supplement tablets, improves the separation of the DPCSV peaks. Consequently, the peak B recorded with 0.01 M borax buffer allows determining SeMet in nutritional supplement tablets by the standard addition method. | nb_NO |
dc.language | eng | nb_NO |
dc.publisher | Norges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for kjemi | nb_NO |
dc.title | Selenomethionine-catalyzed nickel ion reduction at a mercury electrode: applications in the analysis of nutritional supplements | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.source.pagenumber | 2269-2272 | nb_NO |
dc.source.volume | 18 | nb_NO |
dc.source.journal | Electroanalysis | nb_NO |
dc.source.issue | 22 | nb_NO |
dc.contributor.department | Norges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for kjemi | nb_NO |