1, Laura M?Cubillana-Aguilera 1, Ignacio Naranjo-Rodr uez 1, Jos?L. Hidalgo-Hidalgo de Cisneros 1, Juan Jos?Delgado two and Jos?M?Palacios-Santander 1,*Departamento de Qu ica Anal ica, Facultad de Ciencias, Universidad de C iz, C/Republica Saharaui, S/N, 11510 Puerto Genuine, Cadiz, Spain; E-Mails: yahia_sci@yahoo (M.Y.M.A.); steaje@gmail (S.R.B.); [email protected] (L.M.C.A.); [email protected] (I.N.R.); [email protected] (J.L.H.H.C.) Departamento de Ciencia de los Materiales e Ingenier Metal gica y Qu ica Inorg ica, Facultad de Ciencias, Universidad de C iz, C/Republica Saharaui, S/N, 11510 Puerto True, Cadiz, Spain; E-Mail: [email protected]* Author to whom correspondence need to be addressed; E-Mail: [email protected]; Tel.: +34-956-01-6357; Fax: +34-956-01-6460. Received: 28 February 2013; in revised kind: 8 April 2013 / Accepted: 9 April 2013 / Published: 12 AprilAbstract: The present operate reports a study from the electrocatalytic activity of CeO2 nanoparticles and gold sononanoparticles (AuSNPs)/CeO2 nanocomposite, deposited around the surface of a Sonogel-Carbon (SNGC) matrix employed as supporting electrode as well as the application of the sensing devices constructed with them for the determination of ascorbic acid (AA) utilised as a benchmark analyte.Formula of 3-Isopropylpyridin-2(1H)-one Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) had been used to investigate the electrocatalytic behavior of CeO2- and AuSNPs/CeO2-modified SNGC electrodes, utilizing different concentrations of CeO2 nanoparticles and various AuSNPs:CeO2 w/w ratios. The best detection and quantification limits, obtained for CeO2 (ten.0 mg L-1)- and AuSNPs/CeO2 (three.25 w/w)-modified SNGC electrodes, were 1.82979-45-1 Order 59 ?10-6 and five.32 ?10-6 M, and two.93 ?10-6 and 9.PMID:23891445 77 ?10-6 M, respectively, with reproducibility values of five.78 and 6.24 , respectively, to get a linear concentration variety from 1.five to 4.0 mM of AA. The electrochemical devices had been tested for the determination of AA in industrial apple juice for babies. The outcomes wereSensors 2013, 13 compared with those obtained by applying high performance liquid chromatography (HPLC) as a reference approach. Recovery errors beneath five had been obtained in most instances, with typical deviations decrease than 3 for all the modified SNGC electrodes. Bare, CeO2- and AuSNPs/CeO2-modified SNGC electrodes were structurally characterized making use of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). AuSNPs and AuSNPs/CeO2 nanocomposite have been characterized by UV is spectroscopy and X-ray diffraction (XRD), and information regarding their size distribution and shape was obtained by transmission electron microscopy (TEM). The advantages of employing CeO2 nanoparticles and AuSNPs/CeO2 nanocomposite in SNGC supporting material are also described. This analysis suggests that the modified electrode can be a very promising voltammetric sensor for the determination of electroactive species of interest in true samples. Keyword phrases: cerium oxide nanoparticles; gold-studded cerium oxide nanoparticles; sonogel-carbon electrodes; ascorbic acid; structural characterization; electrochemistry; voltammetry; true sample; apple juice for babies1. Introduction As a consequence of their chemical and physical properties, nanomaterials, and in unique nanoparticles, will be the topic of intensive analysis these days due to their scientific and technological significance. Specifically, gold nanoparticles (AuNPs) are employed in a lot of fields: biosensors, cosmetics, nanoelectronic, catalysis, se.