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TIP. Revista especializada en ciencias químico-biológicas
Print version ISSN 1405-888X
TIP vol.11 n.2 Ciudad de México Dec. 2008
Artículos originales
Síntesis enzimática de polímeros semiconductores utilizando la cloroperoxidasa de Caldariomyces fumago
aInstituto de Biotecnología, UNAM. Apdo. Postal 510-3, Cuernavaca, Morelos. C. P. 62250.
bCentro de Investigación en Energía, UNAM. Av. Xochicalco s/n, Temixco, Morelos. C. P. 62580.
Uno de los descubrimientos más importantes del siglo pasado fue la capacidad de ciertos polímeros orgánicos para conducir electricidad. Entre los polímeros intrínsecamentente conductores más interesantes está la polianilina (PANI) cuya síntesis se hace química o electroquímicamente. Para que la PANI tenga mejores propiedades conductoras se requiere de un polímero lineal. La síntesis enzimática de polímeros se ha estudiado en los últimos años. En este trabajo se sintetizaron polímeros empleando la cloroperoxidasa de Caldariomyces fumago a partir de las anilinas sustituidas 2,6-dimetilanilina (DMA), 2,6-dicloroanilina (DCA) y 2,3,5,6-tetracloroanilina (TCA) con el fin de promover la polimerización lineal. Los polímeros fueron dopados con ácido (1S)-(+)-10-canforsulfónico (CSA), ácido dodecilbencensulfónico (DBSA) y ácido 2-acrilamido-2-metil-1-propanosulfónico (AMPSA) en relaciones molares 1:0.25 y 1:0.5. Los polímeros dopados muestran conductividades en la zona de semiconductores. El polímero de TCA dopado con AMPSA fue el que mostró los mayores valores de conductividad y al realizar un barrido a diferentes concentraciones de AMPSA se encontró que el complejo con una relación molar 1:0.5 tenía un valor de 1.6 x 10-2 S·m-1 que es similar a los valores obtenidos para otras anilinas sustituidas con grupos sulfónicos.
Palabras Clave: Anilinas sustituidas; cloroperoxidasa; polímeros intrínsecamente conductores
One of the most important discoveries of the past century was the ability of certain organic polymers to conduct electricity. Among intrinsically conducting polymers, polyaniline (PANI) is traditionally synthesized by chemical or electrochemical methods. in order to have better conducting properties, PANI should be a linear polymer. Recently, enzymatic synthesis of polymers has been explored. In this work, polymers were synthesized using chloroperoxidase from Caldariomyces fumago and substituted anilines such as 2,6-dimethylaniline (DMA), 2,6-dichloroaniline (DCA) and 2,3,5,6-tetrachloroaniline (TCA), in order to promote a linear polymerization. These polymers were doped with (1S)-(+)-10-camphorsulfonic acid (CSA), dodecylbenzenesulfonic acid (DBSA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) with molar ratios of 1:0.25 and 1:0.5. Doped polymers showed conductivity corresponding to the semiconductors. TCA polymer doped with AMPSA showed the higher conductivity values. A wide range of AMPSA concentrations have been tested, and a conductivity value of 1.6 x 10-2 S·m-1 for the complex with molar ratio of 1:0.5 was obtained. This value is similar to those found with other substituted anilines with sulfonic groups.
Key Words: Substituted anilines; chloroperoxidase; intrinsically conducting polymers
Agradecimientos
Los autores agradecen la asesoría de la Dra. Concepción Arenas para realizar las mediciones referentes a la conductividad de las películas obtenidas en este trabajo. Agradecen también la asesoría de la Dra. Soledad Córdoba para realizar el análisis de imágenes.
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Recibido: 20 de Octubre de 2008; Aprobado: 02 de Diciembre de 2008
Este es un artículo publicado en acceso abierto bajo una licencia Creative Commons
