Abstract:O presente trabalho reporta o desenvolvimento de um novo método voltamétrico para análise de íons ouro(III) usando eletrodo de carbono impresso modificado com poli-L-histidina. O procedimento é baseado no acúmulo do complexo [AuCl 4 ] − , na superfície do eletrodo sob potencial de circuito aberto e tempo de acúmulo controlado. Parâmetros que influenciam na resposta, tais como: preparação do filme, pH, potencial de acúmulo e tempo de acúmulo, foram otimizados e curvas analíticas para os íons ouro foram constru… Show more
“…The determination of Au in human urine [105] by cathodic stripping voltammetry in 0.1 M KCl (pH 1.0) following open circuit accumulation has been reported at a poly- l -histidine modified SPCE. The stripping voltammetric determination of the accumulated Au was investigated by linear sweep (LSV), differential pulse (DPV), and square wave voltammetry (SWV).…”
Section: Screen-printed Sensors For Metal Ion Determinationmentioning
This review describes recent advances in the fabrication of electrochemical (bio)sensors based on screen-printing technology involving carbon materials and their application in biomedical, agri-food and environmental analyses. It will focus on the various strategies employed in the fabrication of screen-printed (bio)sensors, together with their performance characteristics; the application of these devices for the measurement of selected naturally occurring biomolecules, environmental pollutants and toxins will be discussed.
“…The determination of Au in human urine [105] by cathodic stripping voltammetry in 0.1 M KCl (pH 1.0) following open circuit accumulation has been reported at a poly- l -histidine modified SPCE. The stripping voltammetric determination of the accumulated Au was investigated by linear sweep (LSV), differential pulse (DPV), and square wave voltammetry (SWV).…”
Section: Screen-printed Sensors For Metal Ion Determinationmentioning
This review describes recent advances in the fabrication of electrochemical (bio)sensors based on screen-printing technology involving carbon materials and their application in biomedical, agri-food and environmental analyses. It will focus on the various strategies employed in the fabrication of screen-printed (bio)sensors, together with their performance characteristics; the application of these devices for the measurement of selected naturally occurring biomolecules, environmental pollutants and toxins will be discussed.
“…Electrochemical sensors are interesting due to the versatility in size, geometry, selection of components, method of detection and surface chosen according to the analyte properties. Several electrochemical techniques are used in signal transducing, including cyclic voltammetry (Mohadesi et al, 2008), pulse voltammetry (conventional and differential) (Bergamini et al, 2009;Dos Reis et al, 2008), square-wave voltammetry (Sartori et al, 2009;Bergamini et al, 2009), stripping voltammetry (Mohadesi et al, 2008) and potentiometry (Santini et al, 2009), and amperometry Karimi-Maleh et al, 2009;Dos Reis et al, 2008;Cervini and Cavalheiro, 2008). With electrochemical cells, measurements can be made of the electrode potential, cell current and cell resistance as a function of the analyte at the electrode surface or at the electrochemical interfaces.…”
Section: Recent Trends In Electrochemical Layer-by-layer Biosensorsmentioning
“…Concentrations of Au in human urine have been quantified at a poly-L-histidine modified SPCE [86]. It was found possible to complex Au, present as tetrachloroaurates, at the modified electrode surface under open circuit conditions.…”
Section: Application Of Modified Screen-printed Carbon Electrodes Formentioning
Abstract:The present review (with 231 references) focuses on developments made in the area of screen-printed biosensors and sensors for the determination of metal ions in industrial, environmental and biomedical applications. The year 2012 represents the twentieth anniversary of the first reported application of screen-printed electrodes for the determination of metal ions. Focus is placed on fabrication techniques, operating details and performance characteristics for the selected applications. The greater proportion of articles have utilised the technique of stripping voltammetry, gaining detection limits in the low ng/mL (ppb) region. An increasing percentage of these have explored bismuth as an alternative to mercury for the modification of the carbon electrode surface. However, a steady number of applications have shown the possibility of utilising the unmodified screen-printed carbon, gold or silver electrode surface. More recently the alternative approach of electrochemical biosensors has become a growing area. The majority of these have exploited the inhabitation metal ions exhibit on the enzyme activity of urease, acetylcholinesterase and glucose oxidase gaining detection limits in the sub µg/mL region, however recent applications utilising thiol-functionalised oligonucleotides have been shown the possibility of gaining detection limits as low as 120 ng/L for Hg .
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