Reactivities of amperometric organic phase peroxidase-modified electrodes in the presence and absence of thiourea and ethylenethiourea as inhibitors

Adeyoju, Olubunmi; Iwuoha, Emmanuel I.; Smyth, Malcolm R.

doi:10.1016/0003-2670(94)00291-s

Cited by 42 publications

(13 citation statements)

References 12 publications

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“…As the copper atom binds two sulphur atoms, the electron density over the metal ion increases 11 . In the case of [Cu(DPTU) 2 Cl] and [Cu(DPTU) 2 Br], the complexes with copper yield a more positive oxidation potential than the complexes with iodide. In addition, the redox peaks of chloride and bromide disappear, suggesting a stronger bond with copper.…”

Section: Electrochemical Behaviour Of Dptu Complexesmentioning

confidence: 99%

“…In recent years, there has been increasing interest in the electrochemical behaviour of thiourea (H 2 NHNCSH) and substituted thiourea at different metal electrodes due to their various structures and applications as additives for metal electrodeposition and its ability to inhibit the corrosion process [1][2][3] . The compounds have been reported to be catalysts for the electroreduction of cations such as zinc 4 or cadmium 5 .…”

Section: Introductionmentioning

confidence: 99%

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Chuaysong¹,

Chooto²,

Pakawatchai³

2008

ScienceAsia

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ABSTRACT:The complexes between copper(I) halides and N,N -diphenylthiourea have been investigated by cyclic voltammetry to compare their structure and behaviour in solid state with those in solution. The halides under investigation include chloride, bromide, and iodide. Chloride and bromide complexes did not show the redox reaction, suggesting that they formed the strongest bond with the metal and hence the oxidation was inhibited. In contrast, iodide behaved differently because of the two peaks of halide and trihalide oxidations. One peak disappeared, leaving the other halide-oxidized peak shifted to a more positive voltage due to the bonding with the metal. In solution, all complexes of N,N -diphenylthiourea were derived from the oxidation process and exhibited oxidation potentials shifted to positive values.

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Section: Electrochemical Behaviour Of Dptu Complexesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

Chuaysong¹,

Chooto²,

Pakawatchai³

2008

ScienceAsia

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“…Adeyojo et al 93 avaliaram estudos de construção de biossensores baseados em enzimas peroxidases imobilizadas em polímeros do tipo Eastman AQ, com dimetilferroceno como mediador da reação catalí-tica do substrato peróxido de butanona (BTP). As medidas de inibição foram efetuadas com os inibidores tiuréia e etilinotiuréia.…”

Section: Peroxidaseunclassified

Biossensores baseados no processo de inibição enzimática

Marques¹,

Yamanaka²

2008

Quím. Nova

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Recebido em 3/5/07; aceito em 30/11/07; publicado na web em 4/9/08 BIOSENSORS BASED ON THE ENZYMATIC INHIBITION PROCESS. Fast, selective, reproducible and reliable detections have been carried out by using enzymatic biosensors in several areas. The enzymatic biosensors based on the inhibition represent an important role in analytical chemistry. Enzymes like cholinesterases, peroxidases, tyrosinases, etc. have been immobilized on electrochemical and optical transducers and the enzymatic activity decreasing in the presence of the inhibitor is related with its concentrations. This article presents a review on the enzymes used on the construction of these sensors, emphasizing the respective applications.

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“…This could be used for quantification of the pesticides, heavy metals, fluorides, cyanides, substituted phenols and thionic substances. The enzyme sensors based on cholinesterase [1 -3], tyrosinase [4,5], urease [6,7] and peroxidase [5,8] have been described for this purpose. However, practical application of enzyme sensors is often limited by the problems of interpretation of their response in multicomponent media, e.g.…”

Section: Introductionmentioning

confidence: 99%