| Автор | Ghanem, Mohamed A. |
| Автор | Compton, Richard G. |
| Автор | Coles, Barry A. |
| Автор | Canals, Antonio |
| Автор | Marken, Frank |
| Дата выпуска | 2005 |
| dc.description | The direct electroanalysis of complex formulations containing α-tocopherol (vitamin E) is possible in micellar solution and employing microwave-enhanced voltammetry. In the presence of microwave radiation substantial heating and current enhancement effects have been observed at 330 µm diameter glassy carbon electrodes placed into a micellar aqueous solution and both hydrophilic and highly hydrophobic redox systems are detected. For the water soluble Fe(CN)6<sup>3â /4â </sup> redox system in micellar aqueous solutions of 0.1 M NaCl and 0.1 M sodium dodecylsulfate (SDS) at low to intermediate microwave power, thermal effects and convection effects are observed. At higher microwave power, thermal cavitation is induced and dominates the mass transport at the electrode surface. For the micelle-soluble redox systems tert-butylferrocene and 2,5-di-tert-butyl-1,4-benzoquinone, strong and concentration dependent current responses are observed only in the presence of microwave radiation. For the oxidation of micelle-soluble α-tocopherol current responses at glassy carbon electrodes are affected by adsorption and desorption processes whereas at platinum electrodes, analytical limiting currents are obtained over a wide range of α-tocopherol concentrations. However, for the determination of α-tocopherol in a commercial formulation interference from proteins is observed at platinum electrodes and direct measurements are possible only over a limited concentration range and at glassy carbon electrodes. |
| Формат | application.pdf |
| Издатель | Royal Society of Chemistry |
| Название | Microwave enhanced electroanalysis of formulations: processes in micellar media at glassy carbon and at platinum electrodes |
| Тип | research-article |
| DOI | 10.1039/b507167d |
| Electronic ISSN | 1364-5528 |
| Print ISSN | 0003-2654 |
| Журнал | Analyst |
| Том | 130 |
| Первая страница | 1425 |
| Последняя страница | 1431 |
| Аффилиация | GhanemPermanent address: Science & Math. Department, Faculty of Petroleum & Mining engineering, Suez, Egypt Mohamed A.; Department of Chemistry, University of Bath |
| Аффилиация | Compton Richard G.; Physical and Theoretical Chemistry Laboratory, Oxford University |
| Аффилиация | Coles Barry A.; Physical and Theoretical Chemistry Laboratory, Oxford University |
| Аффилиация | Canals Antonio; Departamento de QuÃmica AnalÃtica, Nutrición y BromatologÃa, Universidad de Alicante |
| Аффилиация | Marken Frank; Department of Chemistry, University of Bath |
| Выпуск | 10 |
| Библиографическая ссылка | de la Hoz, Chem. Soc. Rev., 2005, 34, 164 |
| Библиографическая ссылка | Thomas, Catal. Lett., 1997, 49, 137 |
| Библиографическая ссылка | Maoz, Langmuir, 1998, 14, 5988 |
| Библиографическая ссылка | Fletcher, Phys. Chem. Chem. Phys., 2001, 3, 1067 |
| Библиографическая ссылка | Compton, Chem. Commun., 1998, 2595 |
| Библиографическая ссылка | Marken, Electroanalysis, 2000, 12, 267 |
| Библиографическая ссылка | Marken, New J. Chem., 2000, 24, 653 |
| Библиографическая ссылка | Sur, J. Electroanal. Chem., 2004, 573, 175 |
| Библиографическая ссылка | Sur, New J. Chem., 2004, 28, 1544 |
| Библиографическая ссылка | Tsai, J. Am. Chem. Soc., 2002, 124, 9784 |
| Библиографическая ссылка | Sur, Chem. Commun., 2004, 2816 |
| Библиографическая ссылка | Sur, Electroanalysis, 2005, 17, 385 |
| Библиографическая ссылка | Baranski, Anal. Chem., 2002, 74, 1294 |
| Библиографическая ссылка | Beckmann, Electrochem. Commun., 1999, 1, 46 |
| Библиографическая ссылка | Qiu, J. Electroanal. Chem., 2000, 492, 150 |
| Библиографическая ссылка | Qiu, Anal. Chem., 2000, 72, 2362 |
| Библиографическая ссылка | Schramm, Annu. Rep. Prog. Chem., Sect. C, 2003, 99, 3 |
| Библиографическая ссылка | Hadjmohammadi, Ann. Chim. (Rome), 2004, 94, 857 |
| Библиографическая ссылка | Rusling, Anal. Chem., 1987, 59, 2123 |
| Библиографическая ссылка | Shah, Langmuir, 1997, 13, 4729 |
| Библиографическая ссылка | Zu, Langmuir, 1997, 13, 3693 |
| Библиографическая ссылка | Pelizzetti, J. Phys. Chem., 1991, 95, 761 |
| Библиографическая ссылка | Ghanem, J. Solid State Electrochem., |
| Библиографическая ссылка | Shah, Colloids Surf., A, 2001, 178, 199 |
| Библиографическая ссылка | Ashokkumar, Ultrason. Sonochem., 1999, 6, 1 |
| Библиографическая ссылка | Hardcastle, Analyst, 2002, 127, 518 |
| Библиографическая ссылка | Ryabov, J. Organomet. Chem., 2001, 637, 469 |
| Библиографическая ссылка | Opallo, Electrochim. Acta, 2005, 50, 1711 |
| Библиографическая ссылка | Wain, Phys. Chem. Chem. Phys., 2004, 6, 836 |
| Библиографическая ссылка | Williams, J. Am. Chem. Soc., 2004, 126, 12441 |
