title: Selective and sensitive electrochemical device for direct VB2determination in real products.
abstract: The developed by us electrochemical device for vitamin B2(VB2; riboflavin) determination, without preconcentration step, in real products exhibits high sensitivity, selectivity, stability and low detection limit compared to those described in the literature. The determination procedure was based on the monitoring of the reduction current signal of VB2bound with dsDNA anchored to the electrode surface through intermediary - carboxyphenyl layer. The application of such intermediary layer formed during electroreduction of appropriate diazonium salt at CV peak potential guarantees high efficiency of hybridization process and thus fully available places for VB2interaction. Moreover, such intermediary layer provides good electrical contact, what is very important in the case of electrochemical sensors. The analytical range of work of the proposed VB2sensor was between 0.08-1µM (30-377μgL-1) of riboflavin concentration. The obtained detection (LOD) and quantification limits (LOQ) were 24±2 and 55±5μgL-1, respectively. The proposed VB2detection method was used for determination of riboflavin content in commercially available dietary supplements and yolk of hen egg samples. The accuracy of the obtained data was proved using comparison with an independent method (HPLC FLD).
authors.affiliation: Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, PL-02-093 Warsaw, Poland. Electronic address: akowalczyk@chem.uw.edu.pl.
authors.forename: Agata
authors.initials: A
authors.lastname: Kowalczyk
authors.affiliation: Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, PL-02-093 Warsaw, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Sadowska
authors.affiliation: Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, PL-02-093 Warsaw, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Krasnodebska-Ostrega
authors.affiliation: Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, PL-02-093 Warsaw, Poland.
authors.forename: Anna M
authors.initials: AM
authors.lastname: Nowicka
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation*; D004531:Eggs / Q000032:analysis; D004563:Electrochemistry / Q000295:instrumentation*; D057230:Limit of Detection; D012256:Riboflavin / Q000032:analysis* / Q000737:chemistry
chemical_list: D012256:Riboflavin
keywords: DNA biosensor; Dietary supplements; Direct VB(2) determination; Intermethod comparison; Square wave voltammetry