نتایج جستجو برای: carbon paste electrod

تعداد نتایج: 288997  

2010
Jan Streuff David E. White Scott C. Virgil Brian M. Stoltz

The catalytic enantioselective synthesis of densely functionalised organic molecules containing all-carbon quaternary stereocentres is a challenge to modern chemical methodology research. The catalytically controlled asymmetric alpha-alkylation of ketones represents another difficult task and has been of major interest to our and other research groups in the past. We now report a palladium-cata...

A multiwall carbon nanotubes-modified carbon paste electrode (MWCNTs/MCPE) wasfabricated and used to study the electrooxidation of penicillamine (PA) by electrochemicalmethods in the presence of methyldopa (MDOP) as a homogeneous mediator. Theelectrochemical oxidation of PA on the new sensor has been carefully studied. The kineticparameters such as electron transfer coefficient, α, and catalyti...

Journal: :Manufacturing Technology 2022

The diffusion boriding process allows to increase the abrasion and corrosion resistance of majority steel grades. aim this study was determine influence chemical composition substrate various grades on microstructure boride coatings produced using two methods: pack cementation EKABOR-2 paste-pack EKABOR-PASTE tool structural steels:. processes were carried out at 1000oC in an argon atmosphere f...

Journal: :Analytical and bioanalytical chemistry 2005
Rene Kizek Michal Masarik Karl J Kramer David Potesil Michele Bailey John A Howard Borivoj Klejdus Radka Mikelova Vojtech Adam Libuse Trnkova Frantisek Jelen

The electroanalytical determination of avidin in solution, in a carbon paste, and in a transgenic maize extract was performed in acidic medium at a carbon paste electrode (CPE). The oxidative voltammetric signal resulting from the presence of tyrosine and tryptophan in avidin was observed using square-wave voltammetry. The process could be used to determine avidin concentrations up to 3 fM (100...

Journal: :Talanta 2003
Winai Ouangpipat Tapparath Lelasattarathkul Churairat Dongduen Saisunee Liawruangrath

The present work describes the development and application of a carbon paste electrode modified by treated-Pennisetum setosum for the determination of lead(II) by anodic stripping differential pulse voltammetry. Most experiments were performed using the preconcentration/voltammetry/regeneration scheme. The resulting modified electrode offers a preferential uptake of lead(II) from solutions. Ope...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2012
Kazuharu Sugawara Asako Yugami Toshihiko Kadoya

The voltammetric detection of phosphoproteins was developed using a gallium(III) acetylacetonate-modified carbon paste electrode. Because phosphate groups of the protein interacted with the gallium(III) ion, the protein was accumulated on the electrode surface. A hexaammine ruthenium(III) ion, which combined with the functional groups, was used to monitor the interaction. When phosvitin and ...

Journal: :Biosensors & bioelectronics 2005
Priti Mulchandani Carlos M Hangarter Yu Lei Wilfred Chen Ashok Mulchandani

An amperometric microbial biosensor for highly specific, sensitive and rapid quantitative determination of p-nitrophenol was developed. The biosensor takes advantage of the ability of Moraxella sp. to specifically degrade p-nitrophenol to hydroquinone, a more electroactive compound than p-nitrophenol. The electrochemical oxidation current of hydroquinone formed in biodegradation of p-nitropheno...

2012
Pavla Macikova Vladimir Halouzka Jan Hrbac Petr Bartak Jana Skopalova

The performances of ionic liquid (1-hexyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide, IL/CPE) and iron phthalocyanine (IP/CPE) modified carbon paste electrodes in electroanalytical determinations of rutin were evaluated and compared to the performance of unmodified carbon paste electrode (CPE). Cyclic voltammetry (CV), differential pulse voltammetry (DPV), differential pulse adsorpti...

2017
Hossein Rajabi Meissam Noroozifar

Uric acid (UA) and folic acid (FA) are compounds of biomedical interest. In humans, about 70% of daily uric acid disposal occurs via the kidneys, and in 5-25% of humans, impaired renal (kidney) excretion leads to hyperuricemia. Folate is another form folic acid of which is known as, is one of the B vitamins. It is used as a supplement by women to prevent neural tube defects developing during pr...

2017
Suw Young Ly Chang Hyun Lee Jae Mo Koo

The cobalt (Co(II)) ion is a main component of alloys and considered to be carcinogenic, especially due to the carcinogenic and toxicological effects in the aquatic environment. The toxic trace of the Co(II) detection was conducted using the infrared photodiode electrode (IPDE) using a working electrode, via the cyclic and square-wave anodic stripping voltammetry. The results indicated a sensit...

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