Vis enkel innførsel

dc.contributor.authorBanica, Florinel Gabrielnb_NO
dc.contributor.authorKafar, Beatanb_NO
dc.contributor.authorSkrzypek, Slawomiranb_NO
dc.contributor.authorCiesielski, Witoldnb_NO
dc.date.accessioned2014-12-19T13:20:32Z
dc.date.available2014-12-19T13:20:32Z
dc.date.created2007-11-19nb_NO
dc.date.issued2006nb_NO
dc.identifier122991nb_NO
dc.identifier.issn1040-0397nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/247431
dc.description.abstractSelenomethionine (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.languageengnb_NO
dc.publisherNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for kjeminb_NO
dc.titleSelenomethionine-catalyzed nickel ion reduction at a mercury electrode: applications in the analysis of nutritional supplementsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.pagenumber2269-2272nb_NO
dc.source.volume18nb_NO
dc.source.journalElectroanalysisnb_NO
dc.source.issue22nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for kjeminb_NO


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel