Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode
The usefulness of a C60-fullerene modified gold (Au) electrode in mediating the oxidation of methionine in the presence of potassium ions electrolyte has been demonstrated. During cyclic voltammetry, an oxidation peak of methionine appearing at þ1.0 V vs. Ag/AgCl was observed. The oxidation current...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
Wiley Blackwell
2008
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/6146/ http://psasir.upm.edu.my/id/eprint/6146/1/Electrochemical%20Oxidation%20of%20Methionine%20Mediated%20by%20a%20Fullerene.pdf |
| _version_ | 1848840296769519616 |
|---|---|
| author | Tan, Wee Tee Goh, Joo Kheng |
| author_facet | Tan, Wee Tee Goh, Joo Kheng |
| author_sort | Tan, Wee Tee |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The usefulness of a C60-fullerene modified gold (Au) electrode in mediating the oxidation of methionine in the
presence of potassium ions electrolyte has been demonstrated. During cyclic voltammetry, an oxidation peak of methionine appearing at þ1.0 V vs. Ag/AgCl was observed. The oxidation current of methionine is enhanced by
about 2 times using a C60 modified gold electrode. The current enhancement is significantly dependent on pH,
temperature and C60 dosage. Calibration plot reveals linearity of up to 0.1 mM with a current sensitivity of close to 50 mA L mol1 and detection limit of 8.2106 M. The variation of scan rate study shows that the system undergoes diffusion-controlled process. Diffusion coefficient and rate constant of methionine were determined using hydrodynamicmethod(rotating disk electrode) with values of 1.11105 cm2 s1 and 0.0026 cm s1 respectively for unmodified electrode while the values of diffusion coefficient and rate constant of methionine using C60 modified Au electrode are 5.7106 cm2 s1 and 0.0021 cm s1 respectively |
| first_indexed | 2025-11-15T07:25:06Z |
| format | Article |
| id | upm-6146 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:25:06Z |
| publishDate | 2008 |
| publisher | Wiley Blackwell |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-61462016-01-20T06:51:29Z http://psasir.upm.edu.my/id/eprint/6146/ Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode Tan, Wee Tee Goh, Joo Kheng The usefulness of a C60-fullerene modified gold (Au) electrode in mediating the oxidation of methionine in the presence of potassium ions electrolyte has been demonstrated. During cyclic voltammetry, an oxidation peak of methionine appearing at þ1.0 V vs. Ag/AgCl was observed. The oxidation current of methionine is enhanced by about 2 times using a C60 modified gold electrode. The current enhancement is significantly dependent on pH, temperature and C60 dosage. Calibration plot reveals linearity of up to 0.1 mM with a current sensitivity of close to 50 mA L mol1 and detection limit of 8.2106 M. The variation of scan rate study shows that the system undergoes diffusion-controlled process. Diffusion coefficient and rate constant of methionine were determined using hydrodynamicmethod(rotating disk electrode) with values of 1.11105 cm2 s1 and 0.0026 cm s1 respectively for unmodified electrode while the values of diffusion coefficient and rate constant of methionine using C60 modified Au electrode are 5.7106 cm2 s1 and 0.0021 cm s1 respectively Wiley Blackwell 2008 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/6146/1/Electrochemical%20Oxidation%20of%20Methionine%20Mediated%20by%20a%20Fullerene.pdf Tan, Wee Tee and Goh, Joo Kheng (2008) Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode. Electroanalysis, 20 (22). pp. 2447-2453. ISSN 1040-0397 http://dx.doi.org/10.1002/elan.200704335 10.1002/elan.200704335 English |
| spellingShingle | Tan, Wee Tee Goh, Joo Kheng Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode |
| title | Electrochemical Oxidation of Methionine Mediated by a
Fullerene-C60 Modified Gold Electrode |
| title_full | Electrochemical Oxidation of Methionine Mediated by a
Fullerene-C60 Modified Gold Electrode |
| title_fullStr | Electrochemical Oxidation of Methionine Mediated by a
Fullerene-C60 Modified Gold Electrode |
| title_full_unstemmed | Electrochemical Oxidation of Methionine Mediated by a
Fullerene-C60 Modified Gold Electrode |
| title_short | Electrochemical Oxidation of Methionine Mediated by a
Fullerene-C60 Modified Gold Electrode |
| title_sort | electrochemical oxidation of methionine mediated by a
fullerene-c60 modified gold electrode |
| url | http://psasir.upm.edu.my/id/eprint/6146/ http://psasir.upm.edu.my/id/eprint/6146/ http://psasir.upm.edu.my/id/eprint/6146/ http://psasir.upm.edu.my/id/eprint/6146/1/Electrochemical%20Oxidation%20of%20Methionine%20Mediated%20by%20a%20Fullerene.pdf |