Chemical Sensors: Voltammetric and Amperometric Electrochemical Sensors

Ghanam, Abdelghani; Mohammadi, Hasna; Haddour, Naoufel; Buret, François

doi:10.1016/b978-0-12-822548-6.00032-7

Cited by 14 publications

(15 citation statements)

References 65 publications

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“…Indeed, for any analyte, as long as it can be reduced or oxidized electrochemically, the resulting faradic current is proportional to its concentration. The advantages of voltammetry are selectivity and sensitivity with a broad concentration range towards several analytes, fast analysis times (few seconds), and the ability to determine kinetic parameters and estimate the mechanisms of chemical and/or electrochemical reactions [ 39 ].…”

Section: Electrochemical Techniques Combined With Mip-sensorsmentioning

confidence: 99%

Molecularly Imprinted Polymers Combined with Electrochemical Sensors for Food Contaminants Analysis

et al. 2021

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Detection of relevant contaminants using screening approaches is a key issue to ensure food safety and respect for the regulatory limits established. Electrochemical sensors present several advantages such as rapidity; ease of use; possibility of on-site analysis and low cost. The lack of selectivity for electrochemical sensors working in complex samples as food may be overcome by coupling them with molecularly imprinted polymers (MIPs). MIPs are synthetic materials that mimic biological receptors and are produced by the polymerization of functional monomers in presence of a target analyte. This paper critically reviews and discusses the recent progress in MIP-based electrochemical sensors for food safety. A brief introduction on MIPs and electrochemical sensors is given; followed by a discussion of the recent achievements for various MIPs-based electrochemical sensors for food contaminants analysis. Both electropolymerization and chemical synthesis of MIP-based electrochemical sensing are discussed as well as the relevant applications of MIPs used in sample preparation and then coupled to electrochemical analysis. Future perspectives and challenges have been eventually given.

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Section: Electrochemical Techniques Combined With Mip-sensorsmentioning

confidence: 99%

Molecularly Imprinted Polymers Combined with Electrochemical Sensors for Food Contaminants Analysis

et al. 2021

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“…The electrochemical transduction mechanism involves producing an electrical signal due to the interaction between the sensing surface and the target analyte [77]. The generated signal can be characterized through different methodologies classified as amperometric, impedimetric, and potentiometric techniques based on the nature of the output signal [78][79][80]. The performance of a biosensor is experimentally evaluated based on its sensitivity, selectivity, the limit of detection (LOD), linear and dynamic ranges, and reproducibility of the response [81].…”

Section: Electrochemical Transductionmentioning

confidence: 99%

Paper and Other Fibrous Materials—A Complete Platform for Biosensing Applications

et al. 2021

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Paper-based analytical devices (PADs) and Electrospun Fiber-Based Biosensors (EFBs) have aroused the interest of the academy and industry due to their affordability, sensitivity, ease of use, robustness, being equipment-free, and deliverability to end-users. These features make them suitable to face the need for point-of-care (POC) diagnostics, monitoring, environmental, and quality food control applications. Our work introduces new and experienced researchers in the field to a practical guide for fibrous-based biosensors fabrication with insight into the chemical and physical interaction of fibrous materials with a wide variety of materials for functionalization and biofunctionalization purposes. This research also allows readers to compare classical and novel materials, fabrication techniques, immobilization methods, signal transduction, and readout. Moreover, the examined classical and alternative mathematical models provide a powerful tool for bioanalytical device designing for the multiple steps required in biosensing platforms. Finally, we aimed this research to comprise the current state of PADs and EFBs research and their future direction to offer the reader a full insight on this topic.

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“…As técnicas eletroquímicas apresentam vantagens notáveis, começando com o custo da instrumentação, que geralmente é muito menor quando comparado como, por exemplo, às técnicas espectroscópicas e cromatográficas [75]. O curto tempo de análise é também uma característica importante desses métodos, consequência das rápidas respostas da variação da corrente, potencial ou condutividade relacionada diretamente com a presença do analito [76]. A possibilidade de análises diretas na amostra sem necessidade de separação ou pré-tratamento é outro aspecto importante para impulsionar o crescimento das aplicações de métodos eletroanalíticos, satisfazendo a crescente necessidade de análises em tempo real [66].…”

Section: -Técnicas Eletroquímicasunclassified

“…Dentre o grupo de técnicas que se baseiam na aplicação de um potencial controlado aos eletrodos e monitoramento da corrente faradaica que resulta neste processo, destacam-se a voltametria cíclica e a amperometria (Figura 8). As técnicas voltamétricas, nas suas diversas formas, são versáteis e efetivas para estudar as variações de espécies eletroativas, sendo especialmente úteis para eletroanálise [76].…”

Section: -Técnicas Eletroquímicasunclassified

“…No primeiro caso, uma varredura do potencial acarreta em variações do carregamento/descarregamento da dupla camada elétrica, o que afetará os resultados, especialmente em baixas concentrações. A amperometria no potencial constante praticamente elimina os processos de carga/descarga da dupla camada, sendo a forma mais favorável, especialmente para baixas concentrações de analitos [76].…”

Section: -Técnicas Eletroquímicasunclassified

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Desenvolvimento de (bio)sensores (nano)estruturados visando a determinação de analitos em amostras farmacêuticas e fluidos biológicos

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Chemical Sensors: Voltammetric and Amperometric Electrochemical Sensors

Cited by 14 publications

References 65 publications

Molecularly Imprinted Polymers Combined with Electrochemical Sensors for Food Contaminants Analysis

Molecularly Imprinted Polymers Combined with Electrochemical Sensors for Food Contaminants Analysis

Paper and Other Fibrous Materials—A Complete Platform for Biosensing Applications

Desenvolvimento de (bio)sensores (nano)estruturados visando a determinação de analitos em amostras farmacêuticas e fluidos biológicos

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