12 documents found, page 1 of 2
Molecularly Imprinted Polypyrrole on Glassy Carbon Electrode Modified with Redu...
Mariano,Thiago M.; Beluomini,Maísa A.; Stradiotto,Nelson R.A molecularly imprinted electrochemical sensor for determination of isoamyl alcohol was successfully constructed by modifying the glassy carbon electrode (GCE) with gold nanoparticles (AuNPs) and reduced graphene oxide (RGO). The modification of the GCE increased the electron transfer rate and the electrode surface area, which, consequently, made more room available for the formation of the molecularly imprinte...
New Detector Based on Composite of Carbon Nanotubes with Nanoparticles of Cobal...
Sá,Acelino C. de; Paim,Leonardo L.; Stradiotto,Nelson R.This work aims to present an alternative detector for the determination of arabinose, galactose, glucose and xylose in hydrolyzed sugarcane bagasse. The detector was developed using an electrode modified with multi-walled carbon nanotubes containing cobalt oxide nanoparticles (GCE/MWCNT/CoOOH) applied in high-performance liquid chromatography (HPLC) with reverse pulsed amperometric detection (RPAD). The limits ...
Electrochemical and theoretical evaluation of the interaction between dna and a...
Arguelho,Maria Lara P. M.; Alves,José do Patrocínio H.; Stradiotto,Nelson R.; Lacerda Júnior,Valdemar; Pires,José Maria; Beatriz,AdilsonThe electrochemical behavior of the interaction of amodiaquine with DNA on a carbon paste electrode was studied using voltametric techniques. In an acid medium, an electroactive adduct is formed when amodiaquine interacts with DNA. The anodic peak is dependent on pH, scan rate and the concentration of the pharmaceutical. Adduct formation is irreversible in nature, and preferentially occurs by interaction of the...
Study of the electrochemical reduction of amoebicide teclozan and its amperomet...
Santos,André L.; Takeuchi,Regina M.; Stradiotto,Nelson R.; Esteves,Ana Paula; Medeiros,Maria JoséThe electrochemical reduction of amoebicide Teclozan (TEC) was studied on a glassy carbon electrode in acetonitrile. Controlled-potential electrolyses were performed for coulometric and preparative purposes. The electrogenerated products were isolated by liquid-liquid extraction and characterized by ¹H NMR. It was observed that TEC presents two voltammetric peaks, each one associated with the cleavage of two C-...
Eletroanálise de derivados acetaldeído com hidrazina e determinação em amostras...
Rodgher,Vanessa S.; Stradiotto,Nelson R.; Zanoni,Maria Valnice B.; Barros,Aquiles A.A square wave voltammetric method is described for the determination of acetaldehyde using the derivatization reaction with hydrazine sulphate, based on the reduction of hydrazone generated as a product that exhibits a single well-defined peak at -1.19V in acetate buffer at pH 5. Calibration graphs were obtained from 1.0 x 10-6 mol L-1 to 10 x 10-6 mol L-1 of acetaldehyde, using a reaction time of 8 min and a h...
Electrochemical reduction and voltammetric determination of diloxanide furoate ...
Santos,André L.; Takeuchi,Regina M.; Stradiotto,Nelson R.The electrochemical reduction of diloxanide furoate (DF) in acetonitrile on glassy carbon electrode was studied in this work. It was observed that DF is reduced after a reversible one-electron transfer followed by an irreversible chemical reaction, diagnosed as C-Cl bond cleavage. Its reduction was followed by linear (LSV), differential pulse (DPV) and square wave voltammetry (SWV). Analytical curves were obtai...
Electrocatalysis and Determination of Ascorbic Acid Through Graphite Paste Elec...
Carmo,Devaney R. do; Silva,Ricardo M. da; Stradiotto,Nelson R.Iron nitroprusside, Fe(II)NP was incorporated into a carbon paste electrode and the electrochemical studies were performed by cyclic voltammetry. The cyclic voltammogram of the modified electrode, Fe(II)NP showed two redox couples ( E½ox)1 = 0.24 and (E½ox)2 = 0.85 V vs. SCE attributed to Fe(II)/Fe(III) and Fe(II)(CN)5NO / Fe(III)(CN)5NO, respectively. The redox couple at (E½ox)1 = 0.24 V presents an electrocat...
Determinação eletroanalítica de corante reativo presente como contaminante em p...
Osugi,Marly E.; Guaratini,Claudia C. I.; Stradiotto,Nelson R.; Zanoni,Maria Valnice BoldrinProcion Green HE-4BD is a reactive dye currently used in affinity purification, and commonly present as a contaminant in the final biological preparation. An assay method is described to determine trace amounts of the dye in the presence of human serum albumin(HSA) and leakage from agarose as affinity sorbent by cathodic stripping voltammetry. The proposed method is based on the reductive peak at -0.55V in B-R ...
Decolourization of anthraquinone reactive dye by electrochemical reduction on r...
Carneiro,Patricia A.; Boralle,Nivaldo; Stradiotto,Nelson R.; Furlan,Maysa; Zanoni,Maria Valnice B.The electrochemistry reduction for the removal of Reactive Blue 4 (RB4) dye from aqueous solution using reticulated glassy carbon electrode is investigated. At pH < 8.0 the anthraquinone group of the RB4 dye are reduced in one cathodic step to hidroquinone after a reversible two-electron process involving a precedent two protons reaction. A stable semiquinone is detected by spectrophotometric technique. At pH >...
Electrochemical sensors: a powerful tool in analytical chemistry
Stradiotto,Nelson R.; Yamanaka,Hideko; Zanoni,Maria Valnice B.Potentiometric, amperometric and conductometric electrochemical sensors have found a number of interesting applications in the areas of environmental, industrial, and clinical analyses. This review presents a general overview of the three main types of electrochemical sensors, describing fundamental aspects, developments and their contribution to the area of analytical chemistry, relating relevant aspects of th...