Electrochemical quantification of 2,6-diisopropylphenol (propofol)

• Autores: Langmaier, Jan; Garay, Fernando Sebastian; Kivlehan, Francine; Chaum, Edward; Lindner, Erno
• Año de publicación: 2011
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: 2,6-Diisopropylphenol; Anesthesia; Cyclic Voltammetry; Electrochemistry; Propofol; Target-Controlled Infusion Anesthesia
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

2,6-Diisopropylphenol (propofol) is a potent anesthetic drug with fast onset of the anesthetic effect and short recovery time for the patients. Outside of the United States, propofol is widely used in performing target controlled infusion anesthesia. With the long term vision of an electrochemical sensor for in vivo monitoring and feedback controlled dosing of propofol in blood, different alternatives for the electrochemical quantification of propofol using diverse working electrodes and experimental conditions are presented in this contribution.When the electrochemical oxidation of propofol takes place on a glassy carbon working electrode, an electrochemically active film grows on the electrode surface. The reduction current of the film is proportional to the propofol concentration and the accumulation time. Based on these findings a stripping analytical method was developed for the detection of propofol in acidic solutions between 0 and 30 μM, with a detection limit of 5.5 ± 0.4 μM.By restricting the scanned potential window between 0.5. V and 1.0. V in cyclic voltammetric experiments, the formation of the electrochemically active polymer can be prevented. This allowed the development of a direct voltammetric method for assessing propofol in acidic solutions between 0 and 30 μM, with a 3.2 ± 0.1 μM (n= 3) detection limit.The stripping method has a better sensitivity but somewhat worse reproducibility because the electrode surface has to be renewed between each experiment. The direct method does not require the renewal of the electrode surface between measurements but has no adequate selectivity towards the common interfering compounds. © 2011 Elsevier B.V.
Fil: Langmaier, Jan. University of Memphis; Estados Unidos. Academy of Sciences of the Czech Republic; República Checa
Fil: Garay, Fernando Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. University of Memphis; Estados Unidos
Fil: Kivlehan, Francine. University of Memphis; Estados Unidos
Fil: Chaum, Edward. University of Tennessee; Estados Unidos
Fil: Lindner, Erno. University of Memphis; Estados Unidos