Electrochemical detection of phenolic estrogenic compounds at carbon nanotube-modified electrodes

Electrochemical Monitoring of the Interaction between 4-Nonylphenol and DNA by Graphite and Carbon Nanotube Modified Graphite Electrodes

“…While other groups [34][35][36] presented the electrochemical sensor for NP detection by using different transducers; MWCNT-GCE, Pt-RDE, and CFE in the lowest NP concentration range varying between 10 μM and 6 mM, we developed more sensitive graphite sensors in the concentration range of 0.45 -22.5 μM NP by using both disposable PGE and SWCNT-PGE in combination with DPV technique. These unmodified PGEs and modified PGEs with SWCNT can provide more rapid and more sensitive detection scheme not only for detection of NP, but also for the interaction of NP with nucleic acids.…”

“…The electrochemical detection was performed using less amounts of NP in comparison to the earlier reports. [34][35][36] Nanomaterial based electrochemical sensors could offer a great promise for sensitive screening of compounds in solution and at surface interactions, especially to the study of DNA interactions in general. These studies have also a key importance for further development of nanomaterial based electrochemical sensors, which may possibly be used in order to monitor the toxic effects of targeted compounds in real samples for enviromental monitoring.…”

“…33 The electrochemical detection of NP was investigated with cyclic voltammetry (CV) by using different sensor technologies. [34][35][36] Vega et al 34 reported that NP could be detected by employing the multi-walled CNT (MWCNT) modified glassy carbon electrode (GCE) measuring the oxidation signal of NP at +0.606 V vs. Ag/AgCl at the concentration level of 1.0 × 10 -4 M. In another study, 35 the detection of 6.0 × 10 -3 M NP was performed by platinum rotating disk electrode (Pt-RDE) with its oxidation signal observed at +1.05 V vs. Ag/AgCl. Agui et al 36 presented a study for NP detection by using carbon fiber electrode (CFE) in the NP concentration level of 1.0 × 10 -5 M; its oxidation signal was measured at +0.513 V vs. Ag/AgCl.…”

Enzyme based phenol biosensors

“…This improvement results from both increased surface area and increased catalytic activity. Carbon nanotubes (CNTs) have emerged as a new class nanomaterials that are receiving considerable interest owing to their ability to promote electron transportation (Zhao et al, 2006;Chen et al, 2007;Zeng et al, 2007;Liu et al, 2006;Vega et al, 2007;Santos et al, 2007). The high conductivity of this carbon material leading to a level of 10 2 Ω -1 cm -1 improves electrochemical signal transduction, while its nano-architecture imposes the electron contact between redox centers, deeply inlaid in enzyme structure, and the smooth surface of the electrode.…”

Determinação de tetraciclina utilizando eletrodos compósitos grafite-poliuretana modificados com polímeros metacrilatos com impressão molecular

“…A detecção eletroquímica por técnicas voltamétricas são usadas com frequência, devido às vantagens bem conhecidas, como sensibilidade, seletividade, simplicidade e quase nenhum pré-tratamento da amostra [2][3][4]. Técnicas eletroquímicas, como amperometria e voltametria também são métodos amplamente utilizados na determinação de tetraciclinas [37][38][39][40][41][42][43].…”