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A simple gold plate electrode modified with Gd-doped TiO(2) nanoparticles used for determination of trace nitrite in cured food.
MedLine Citation:
PMID:  22920967     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A simple gold plate electrode (GPE) based on a gadolinium-doped titanium dioxide (Gd/TiO(2)) ultrathin film was successfully constructed by using a surface sol-gel technique, and used for the detection of trace amounts of nitrite in cured foods. The Gd/TiO(2) nanoparticles were synthesised and characterised via scanning electron microscopy (SEM) and X-ray diffraction (XRD), indicating that the Gd-doped TiO(2) formed an anatase phase through roasting at 450°C, generating actively interstitial oxygen at the interface of the surface of TiO(2) lattice surrounded by Gd(3+). The electro-catalytic effect for oxidation of nitrite on the modified electrode was investigated by cyclic voltammetry in 0.10 mol l(-1) sulfuric acid media solution, showing that the modified electrode exhibited excellent response performance to nitrite with good reproducibility, selectivity and stability. The catalytic peak current was found to be linear with nitrite concentrations in the range of 8.0 × 10(-7) to 4.0 × 10(-4 ) mol l(-1), with a detection limit of 5.0 × 10(-7 )mol l(-1) (S/N = 3). The modified electrode could be used for the determination of nitrite in the cured sausage samples with a satisfactory recovery in the range of 95.5-104%, showing its promising application for food safety monitoring.
Authors:
M-L Zhang; Z Cao; J-L He; L Xue; Y Zhou; S Long; T Deng; L Zhang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-24
Journal Detail:
Title:  Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment     Volume:  -     ISSN:  1944-0057     ISO Abbreviation:  Food Addit Contam Part A Chem Anal Control Expo Risk Assess     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101485040     Medline TA:  Food Addit Contam Part A Chem Anal Control Expo Risk Assess     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering , Changsha University of Science and Technology , Changsha 410004 , China.
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