<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0186-2979</journal-id>
<journal-title><![CDATA[Universidad y ciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Universidad y ciencia]]></abbrev-journal-title>
<issn>0186-2979</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0186-29792012000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biotecnología aplicada a la degradación de colorantes de la industria textil]]></article-title>
<article-title xml:lang="en"><![CDATA[Biotechnology applied to the degradation of textile industry dyes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortazar-Martínez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Ramírez]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Coronel-Olivares]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escalante-Lozada]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Rosas]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villagómez-Ibarra]]></surname>
<given-names><![CDATA[JR]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Área académica de Química ]]></institution>
<addr-line><![CDATA[ Hidalgo]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Departamento de Ingeniería Celular y Biocatálisis ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>187</fpage>
<lpage>199</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0186-29792012000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0186-29792012000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0186-29792012000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La presencia de colorantes en las aguas residuales representa un problema ambiental, ya que este tipo de compuestos no puede eliminarse con los métodos de tratamiento convencionales. Debido a que la mayoría de los sistemas de tratamiento basados en métodos químicos o físicos son costosos y requieren de gran cantidad de energía y reactivos, la biotecnología ofrece una alternativa de tratamiento. En este trabajo, además de mencionar algunas tecnologías convencionales, se revisan los reportes donde se han logrado degradar colorantes utilizando métodos biológicos. Una de las ventajas de este tipo de tecnologías es que, además de la decoloración, se puede alcanzar la completa mineralización del colorante. Existe un gran número de microorganismos con la capacidad de eliminar el color de las aguas residuales mediante mecanismos como: la biosorción, la biodegradación aeróbica o anaeróbica y la producción de enzimas que catalizan la decoloración. Una de las aplicaciones de la biotecnología es la generación de nuevas cepas microbianas, éstas pueden constituir la base de tecnologías novedosas para la remediación de compuestos xenobióticos que no son fácilmente degradados con los métodos convencionales. Hasta hace una década, la identificación de cepas activas en la degradación se realizaba por ensayo y error (rondas sucesivas de mutagénesis y rastreo o selección de mutantes) o bien seleccionando microorganismos adaptados provenientes de entornos contaminados. El desarrollo de tecnologías de ADN recombinante ha generado nuevas perspectivas para la optimización de los procesos biotecnológicos de tratamiento ambiental.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The presence of dyes in wastewater represents an environmental problem as this type of compounds cannot be eliminated through conventional methods of treatment. Biotechnology offers an alternative treatment, as most of the treatment systems based on chemical or physical methods are expensive and consume a great amount of energy and chemicals. This study mentions some conventional technologies together with a review of reports in which dyes have been degraded through biological methods. One of the advantages of this type of technologies is that a complete mineralisation of the dye can be achieved, apart from decolouration. There are a great number of microorganisms capable of eliminating colour in wastewater through mechanisms such as: biosorption, anaerobic or aerobic biodegradation and the production of enzymes that catalyse the decolouration process. One of the applications of biotechnology is the generation of new microbial strains that may constitute the basis of novel technologies for the remediation of xenobiotic compounds that are not easily degraded by conventional methods. Up to one decade ago, the identification of strains active in degradation was carried out through trial and error (successive rounds of mutagenesis and selection of mutants) or by selecting microorganisms adapted to polluted environments. The development of recombinant DNA technologies has generated new prospects for the optimisation of biotechnological processes for environmental treatments.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biodegradación]]></kwd>
<kwd lng="es"><![CDATA[colorantes azo]]></kwd>
<kwd lng="es"><![CDATA[mineralización]]></kwd>
<kwd lng="en"><![CDATA[Biodegradation]]></kwd>
<kwd lng="en"><![CDATA[azo dyes]]></kwd>
<kwd lng="en"><![CDATA[mineralisation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Ensayos</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>      <p align="center"><font face="verdana" size="4"><b>Biotecnolog&iacute;a aplicada a la degradaci&oacute;n de colorantes de la industria textil</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Biotechnology applied to the degradation of textile industry dyes</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A Cortazar&#45;Mart&iacute;nez<sup>1</sup>, CA Gonz&aacute;lez&#45;Ram&iacute;rez<sup>1 *</sup>, C Coronel&#45;Olivares<sup>1</sup>, JA Escalante&#45;Lozada<sup>2</sup>, J Castro&#45;Rosas<sup>1</sup>, JR Villag&oacute;mez&#45;Ibarra<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><sup>1 </sup><i>&Aacute;rea acad&eacute;mica de Qu&iacute;mica, UAEH. Ciudad Universitaria, Km 4.5 Carretera Pachuca&#45;Tulancingo, C.P. 42184 Mineral de la Reforma, Hidalgo. (ACM)(CAGR)(CCO)(JCR)(JRVI) * Correo electr&oacute;nico:</i> <a href="mailto:cramirez@uaeh.edu.mx">cramirez@uaeh.edu.mx</a> </font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup>2 </sup><i>Departamento de Ingenier&iacute;a Celular y Biocat&aacute;lisis. Instituto de Biotecnolog&iacute;a, UNAM. Avenida Universidad 2001, Col. Chamilpa C.P. 62210 Cuernavaca, Morelos. (JAEL)</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Ensayo recibido: 19 de septiembre de 2010,     <br> Aceptado: 18 de enero de 2012</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">La presencia de colorantes en las aguas residuales representa un problema ambiental, ya que este tipo de compuestos no puede eliminarse con los m&eacute;todos de tratamiento convencionales. Debido a que la mayor&iacute;a de los sistemas de tratamiento basados en m&eacute;todos qu&iacute;micos o f&iacute;sicos son costosos y requieren de gran cantidad de energ&iacute;a y reactivos, la biotecnolog&iacute;a ofrece una alternativa de tratamiento. En este trabajo, adem&aacute;s de mencionar algunas tecnolog&iacute;as convencionales, se revisan los reportes donde se han logrado degradar colorantes utilizando m&eacute;todos biol&oacute;gicos. Una de las ventajas de este tipo de tecnolog&iacute;as es que, adem&aacute;s de la decoloraci&oacute;n, se puede alcanzar la completa mineralizaci&oacute;n del colorante. Existe un gran n&uacute;mero de microorganismos con la capacidad de eliminar el color de las aguas residuales mediante mecanismos como: la biosorci&oacute;n, la biodegradaci&oacute;n aer&oacute;bica o anaer&oacute;bica y la producci&oacute;n de enzimas que catalizan la decoloraci&oacute;n. Una de las aplicaciones de la biotecnolog&iacute;a es la generaci&oacute;n de nuevas cepas microbianas, &eacute;stas pueden constituir la base de tecnolog&iacute;as novedosas para la remediaci&oacute;n de compuestos xenobi&oacute;ticos que no son f&aacute;cilmente degradados con los m&eacute;todos convencionales. Hasta hace una d&eacute;cada, la identificaci&oacute;n de cepas activas en la degradaci&oacute;n se realizaba por ensayo y error (rondas sucesivas de mutag&eacute;nesis y rastreo o selecci&oacute;n de mutantes) o bien seleccionando microorganismos adaptados provenientes de entornos contaminados. El desarrollo de tecnolog&iacute;as de ADN recombinante ha generado nuevas perspectivas para la optimizaci&oacute;n de los procesos biotecnol&oacute;gicos de tratamiento ambiental.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Biodegradaci&oacute;n, colorantes azo, mineralizaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">The presence of dyes in wastewater represents an environmental problem as this type of compounds cannot be eliminated through conventional methods of treatment. Biotechnology offers an alternative treatment, as most of the treatment systems based on chemical or physical methods are expensive and consume a great amount of energy and chemicals. This study mentions some conventional technologies together with a review of reports in which dyes have been degraded through biological methods. One of the advantages of this type of technologies is that a complete mineralisation of the dye can be achieved, apart from decolouration. There are a great number of microorganisms capable of eliminating colour in wastewater through mechanisms such as: biosorption, anaerobic or aerobic biodegradation and the production of enzymes that catalyse the decolouration process. One of the applications of biotechnology is the generation of new microbial strains that may constitute the basis of novel technologies for the remediation of xenobiotic compounds that are not easily degraded by conventional methods. Up to one decade ago, the identification of strains active in degradation was carried out through trial and error (successive rounds of mutagenesis and selection of mutants) or by selecting microorganisms adapted to polluted environments. The development of recombinant DNA technologies has generated new prospects for the optimisation of biotechnological processes for environmental treatments.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Biodegradation, azo dyes, mineralisation.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Dentro de los compuestos xenobi&oacute;ticos, los colorantes de tipo azo son de importancia debido a que son ampliamente utilizados en diferentes tipos de industrias, como la textil. Durante los procesos de te&ntilde;ido, se desechan ciertas cantidades de colorantes que son vertidos en las aguas residuales. La presencia de colorantes en el agua no solamente es un problema est&eacute;tico, sino que adem&aacute;s interfieren en el proceso fotosint&eacute;tico que realizan algunos organismos (Soares <i>et al.</i> 2000). Para la bioremediaci&oacute;n de aguas contaminadas con colorantes se han utilizado organismos aislados de entornos contaminados, consorcios microbianos o enzimas aisladas de estos sistemas biol&oacute;gicos (Kandelbauer &amp; Guebitz 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">La biodegradaci&oacute;n de colorantes se lleva a cabo mediante distintos procesos. Se pueden utilizar cultivos mixtos que contengan dos grupos generales de especies, el primero conformado por organismos que no participan en la degradaci&oacute;n del colorante, pero que estabilizan el consorcio microbiano, y un segundo grupo que incluya a las especies involucradas en el rompimiento del grupo funcional de la mol&eacute;cula y la transformaci&oacute;n de los productos metab&oacute;licos resultantes. Otra manera de llevar a cabo la biodegradaci&oacute;n es mediante microorganismos aislados que son capaces de degradar los colorantes. Por &uacute;ltimo, para llevar a cabo la biodegradaci&oacute;n se puede emplear la remediaci&oacute;n enzim&aacute;tica (Kandelbauer &amp; Guebitz 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>M&eacute;todos de tratamientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">M&aacute;s de diez mil diferentes tipos de pigmentos y colorantes sint&eacute;ticos son usados en diferentes industrias como la textil, papelera, cosm&eacute;tica, farmac&eacute;utica, entre otras. Dependiendo del tipo de colorante, se estima que del 2 al 50 % de estos compuestos se desechan en las aguas residuales y se consideran como contaminantes persistentes que no pueden removerse con los m&eacute;todos convencionales de tratamiento de aguas, debido a que presentan estructuras complejas y a su origen sint&eacute;tico (Kuhad et al. 2004; D&iacute;as et al. 2007; Dos Santos et al. 2007). Los colorantes est&aacute;n formados por un grupo de &aacute;tomos responsables del color (crom&oacute;foros). Los grupos crom&oacute;foros m&aacute;s comunes son los azo (&#45;N=N&#45;), carbonilo ( C=O), metilo (&#45;CH<sub>3</sub>), nitro y grupos quinoides. En la <a href="/img/revistas/uc/v28n2/a9f1.jpg" target="_blank">Figura 1</a> se muestran ejemplos de algunos colorantes que presentan estos grupos crom&oacute;foros. Los colorantes tambi&eacute;n pueden contener otros grupos que incrementan la intensidad del color y que pueden ser de tipo reactivo, &aacute;cidos, directos, b&aacute;sicos, dispersos, ani&oacute;nicos, sulfuros, entre otros. (Christie 2001; D&iacute;as et al. 2007;).</font></p>     <p align="justify"><font face="verdana" size="2">Se ha demostrado que ciertos colorantes azo pueden ser carcinog&eacute;nicos y mutag&eacute;nicos, adem&aacute;s de que sus productos de degradaci&oacute;n pueden resultar m&aacute;s t&oacute;xicos (Brown &amp; DeVito 1994; Ramsay &amp; Nguyen 2002; Giordano et al. 2005; Gavril &amp; Hodson 2007). La toxicidad de colorantes se ha evaluado utilizando diversos bioindicadores como <i>Daphnia magna, Salmonella thyphimurium</i> y peces, adem&aacute;s se han realizado ensayos en ratas e incluso monitoreos biol&oacute;gicos a trabajadores de la industria textil (Mathur <i>et al.</i> 2003; Bae <i>et al.</i> 2006; Chhaya <i>et al.</i> 2007; D&ouml;nbak <i>et al.</i> 2006; Kwon <i>et al.</i> 2008).</font></p>     <p align="justify"><font face="verdana" size="2"><b>M&eacute;todos convencionales para el tratamiento de aguas residuales que contienen colorantes</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Existen muchos m&eacute;todos para el tratamiento de aguas residuales contaminadas con colorantes. En la <a href="/img/revistas/uc/v28n2/a9t1.jpg" target="_blank">Tabla 1</a> se resumen los m&eacute;todos m&aacute;s utilizados para el tratamiento de las aguas residuales de la industria textil. Se incluyen algunas tecnolog&iacute;as recientes como la filtraci&oacute;n por membrana y los procesos fotoqu&iacute;micos. Estos m&eacute;todos se aplican de manera eficiente y se encuentran disponibles comercialmente. Algunas tecnolog&iacute;as son altamente espec&iacute;ficas, con costos elevados, no se aplican para una amplia variedad de colorantes y no resuelven el problema de la decoloraci&oacute;n (Kuhad <i>et al.</i> 2004; Anjaneyulu <i>et al.</i> 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>M&eacute;todos biol&oacute;gicos para el tratamiento de las aguas residuales de la industria textil</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El t&eacute;rmino bioremediaci&oacute;n abarca una amplia variedad de procesos como la bioabsorci&oacute;n, la biodegradaci&oacute;n (aerobia o anaerobia) y m&eacute;todos enzim&aacute;ticos. Para la decoloraci&oacute;n, los reactores pueden contener cultivos mixtos, organismos aislados o enzimas aisladas (Kandelbauer &amp; Guebitz 2005). En la <a href="/img/revistas/uc/v28n2/a9t2.jpg" target="_blank">Tabla 2</a> se muestran ejemplos de algunas especies de hongos y de bacterias utilizadas en el tratamiento biol&oacute;gico de colorantes. Estos organismos presentan diferentes mecanismos de acci&oacute;n frente a los colorantes (Kuhad <i>et al.</i> 2004).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Biosorci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Un m&eacute;todo novedoso para la remoci&oacute;n del color de efluentes es la adsorci&oacute;n o absorci&oacute;n de las sustancias coloridas en varios materiales como: aserr&iacute;n, carb&oacute;n activado, arcillas, suelos, composta, lodos activados, comunidades vegetales, pol&iacute;meros sint&eacute;ticos o sales inorg&aacute;nicas coagulantes (Chandran <i>et al.</i> 2002). Al proceso que utiliza a la biomasa, se le conoce como biosorci&oacute;n; en este proceso la decoloraci&oacute;n se alcanza por la saturaci&oacute;n y posterior biosorci&oacute;n del colorante sobre las c&eacute;lulas, ocurriendo esto con o sin biodegradaci&oacute;n del contaminante. Algunas especies de bacterias y hongos han sido reportadas por su capacidad para remover colorantes utilizando el proceso de adsorci&oacute;n. Al respecto Chen <i>et al.</i> (1999) reportan la decoloraci&oacute;n de una soluci&oacute;n del colorante azo (rojo RBN), utilizando una cepa de <i>Proteus mirabilis,</i> que fue aislada de lodos provenientes de una planta de tratamiento de aguas residuales; el porcentaje de decoloraci&oacute;n fue entre 13 y 17 %, debido al proceso de biosorci&oacute;n de estas c&eacute;lulas bacterianas. Tambi&eacute;n se puede lograr la eliminaci&oacute;n del color mediante biosorci&oacute;n usando c&eacute;lulas de hongos (Fu &amp; Viraraghavan 2002; Zhang <i>et al.</i> 2003; Bhole <i>et al.</i> 2004). En algunos casos, el mecanismo de decoloraci&oacute;n implica, adem&aacute;s de la biosorci&oacute;n, un proceso de degradaci&oacute;n enzim&aacute;tica (Knapp <i>et al.</i> 1997; Park <i>et al.</i> 2007; Yesilada <i>et al.</i>2010). Estos m&eacute;todos no se han aplicado al tratamiento de aguas residuales en gran escala, debido a los problemas asociados con el manejo de la biomasa residual que se obtiene despu&eacute;s de la biosorci&oacute;n (Kuhad <i>et al.</i> 2004).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Biodegradaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Como se puede apreciar en la <a href="/img/revistas/uc/v28n2/a9t2.jpg" target="_blank">Tabla 2</a>, existe una amplia variedad de microorganismos que pueden degradar colorantes. Los actinomicetos han demostrado que pueden degradar compuestos xenobi&oacute;ticos por su capacidad de producir enzimas lignol&iacute;ticas. La habilidad de los actinomicetos, principalmente especies de <i>Streptomyces,</i> para decolorar y mineralizar colorantes textiles se ha comprobado en diferentes estudios (Ball <i>et al.</i> 1989; Goszczynski <i>et al.</i> 1994; Ball &amp; Cotton 1996). Un gran n&uacute;mero de bacterias reducen los enlaces azo de los colorantes textiles, este proceso es el paso inicial en la degradaci&oacute;n bacteriana de colorantes de tipo azo (Stolz 2001; Pandey <i>et al.</i> 2007).</font></p>     <p align="justify"><font face="verdana" size="2">La decoloraci&oacute;n de colorantes azo puede llevarse a cabo de manera aerobia o anaer&oacute;bica, dependiendo del tipo de bacteria que lo lleve a cabo. Hay otros reportes sobre el metabolismo aerobio de colorantes azo utilizando diferentes cepas de bacterias, por ejemplo <i>Aeromonas</i> sp., <i>Bacillus subtilis, Proetus mirabilis</i> y <i>Pseudomonas luteola</i> (Horitsu <i>et al.</i> 1977; Chen <i>et al.</i> 1999; Chang &amp; Lin 2000; Hayase <i>et al.</i> 2000). La azorreducci&oacute;n puede ser estimulada por la adici&oacute;n de inductores como el CaCl<sub>2</sub> (Dawkar <i>et al.</i> 2009) o co&#45;sustratos como la glucosa (Haug <i>et al.</i> 1991). Adem&aacute;s de colorantes azo, tambi&eacute;n est&aacute; reportada la degradaci&oacute;n bacteriana de otro tipo de colorantes. <i>Citrobacter</i> sp. tiene la capacidad de decolorar diversos colorantes recalcitrantes de tipo azo y trifenilmetano, utilizando mecanismos de biosorci&oacute;n y biodegradaci&oacute;n (An <i>et al.</i> 2002). El cristal violeta (colorante trifenilmetano) puede ser degradado a trav&eacute;s de una mineralizaci&oacute;n aer&oacute;bica por bacterias como <i>Pseudomonas mendocina</i> (Sarnaik &amp; Kanekar 1999) y <i>Pseudomonas putida</i> (Chen <i>et al.</i> 2007). Se han reportado algunas bacterias que pueden romper el enlace azo de algunos colorantes bajo condiciones anaerobias, dando lugar a la decoloraci&oacute;n y formaci&oacute;n de aminas arom&aacute;ticas (Chung <i>et al.</i> 1992). En algunos casos, la decoloraci&oacute;n puede ir acompa&ntilde;ada no s&oacute;lo de la degradaci&oacute;n del colorante, sino de la producci&oacute;n de aminas arom&aacute;ticas. Se ha obtenido la completa mineralizaci&oacute;n de colorantes de tipo azo utilizando consorcios microbianos en condiciones anaerobias (Nigam <i>et al.</i> 1996; Gonz&aacute;lez&#45;Gutierrez <i>et al.</i> 2009). Tambi&eacute;n es posible consorcios capaces de mineralizar completamente colorantes en sistemas aerobios&#45;anaerobios o bien bajo condiciones an&oacute;xicas. Huag <i>et al.</i> (1991) lograron la completa mineralizaci&oacute;n de un colorante azo bajo condiciones anaerobias, utilizando un consorcio bacteriano crecido en condiciones aer&oacute;bicas. En el trabajo de Yu <i>et al.</i> (2001) se aislaron cepas de un lodo activado de un sistema aerobio&#45;anaerobio logrando la degradaci&oacute;n de colorantes azo con diferentes estructuras qu&iacute;micas, mediante cepas de <i>Pseudomonas,</i> en condiciones an&oacute;xicas.</font></p>     <p align="justify"><font face="verdana" size="2">La velocidad de degradaci&oacute;n depende numerosos factores, tales como: el pH, la temperatura, los nutrientes, as&iacute; como de la especificidad de la enzima por el sustrato.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los hongos de la putrefacci&oacute;n blanca (PB) son los organismos m&aacute;s estudiados en la degradaci&oacute;n de colorantes, debido a que son capaces de degradar sustratos complejos a trav&eacute;s de un sistema enzim&aacute;tico no espec&iacute;fico (Knapp <i>et al.</i> 2001). La decoloraci&oacute;n de colorantes por hongo PB fue reportada por primera vez por Glenn &amp; Gold (1983) quienes evaluaron la decoloraci&oacute;n de colorantes polim&eacute;ricos sulfonados utilizando <i>Phanerochaete chrysos&#45;porium.</i> A partir de entonces se han publicado numerosos trabajos donde se eval&uacute;a la capacidad de <i>P. chrysosporium</i> y de otros hongos como <i>Cyathus bulleri, Trametes versicolor, Phlebia tremellosa, The&#45;lephora</i> sp. para degradar colorantes (Goszczynski et al. 1994; Vasdev &amp; Kuhad 1994; Swamy &amp; Ramsay 1999; Kirby <i>et al.</i> 2000; Selvam <i>et al.</i> 2003; Toh <i>et al.</i> 2003). Novotny <i>et al.</i> (2001) seleccion&oacute; de entre 103 especies de hongos a las especies <i>Irpex lacteus</i> y <i>Pleurotus ostreatus</i> por su capacidad para degradar colorantes de diferentes tipos (azo, diazo, antraquinona, trifenilmetano, ftalocianina).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>M&eacute;todos enzim&aacute;ticos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas vivas se consideran como un reactor de decoloraci&oacute;n en miniatura. Esta decoloraci&oacute;n puede ser resultado de la retenci&oacute;n f&iacute;sica del colorante en la biomasa o de la transformaci&oacute;n bioqu&iacute;mica del colorante a trav&eacute;s del metabolismo celular. Algunas de las enzimas que se utilizan en la degradaci&oacute;n de colorantes son lacasas, peroxidasas, monooxigenasas y dioxigenasas entre otras (Kandelbauer &amp; Guebitz 2005). Las enzimas extracelulares como las lacasas y peroxidasas generalmente se producen por hongos cuya funci&oacute;n natural es degradar la lignina. La habilidad de los hongos PB para degradar colorantes y otros compuestos xenobi&oacute;ticos se debe a la naturaleza no espec&iacute;fica de su sistema enzim&aacute;tico. El uso de lacasas y peroxidasas para la degradaci&oacute;n de compuestos xenobi&oacute;ticos resulta muy prometedor (Harvey &amp; Thurston 2001).</font></p>     <p align="justify"><font face="verdana" size="2">Se ha reportado la decoloraci&oacute;n de una mezcla de colorantes, simulando un efluente real, a trav&eacute;s de una lacasa comercial, adem&aacute;s se obtuvo el modelo cin&eacute;tico de esta degradaci&oacute;n (Crist&oacute;vao <i>et al.</i> 2009). Tambi&eacute;n hay numerosos reportes de la degradaci&oacute;n de colorantes azo, trifenilmetano y antraquinona utilizando la lacasa de <i>Pyricularia oryzae, Trametes hirsuta, Pycnoporous sanguineus</i> y <i>Sclerotium rolfsii</i> (Muralikrishna &amp; Renganathan 1995; Abadulla <i>et al.</i> 2000; Pointing &amp; Vrijmoed 2000; Ryan <i>et al.</i> 2003).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Ingenier&iacute;a Gen&eacute;tica aplicada a la degradaci&oacute;n de colorantes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los microorganismos empleados en la remoci&oacute;n de colorantes se pueden obtener de entornos donde existan colorantes, como los efluentes de la industria textil. Usualmente no se trata de aislar las cepas que por adaptaci&oacute;n natural son capaces de degradar colorantes, sino de aprovechar los beneficios de su presencia, por ejemplo, en una planta de tratamiento municipal. Se ha reportado la obtenci&oacute;n de bacterias o consorcios microbianos capaces de degradar colorantes, debido a la adaptaci&oacute;n de los organismos al estr&eacute;s ambiental y a la presi&oacute;n evolutiva debido a las condiciones del efluente (Yu <i>et al. </i>2001; Dafale <i>et al.</i> 2008; Kalyani <i>et al.</i> 2008).</font></p>     <p align="justify"><font face="verdana" size="2">En ese sentido, se pueden obtener cepas h&iacute;bridas con la capacidad de degradar colorantes, mediante ingenier&iacute;a gen&eacute;tica. Se han identificado un gran n&uacute;mero de genes que confieren la habilidad de degradar colorantes y se ha reportado la decoloraci&oacute;n de un colorante azo usando una cepa de <i>E. coli</i> con los genes de una azoreductasa de una cepa silvestre de <i>Pseudomonas luteola.</i> Esta metodolog&iacute;a permite acortar los tiempos que se utilizar&iacute;an para adaptar un cultivo apropiado y luego aislar las cepas (Chang <i>et al.</i> 2000). Chang &amp; Lin (2001) clonaron y expresaron un fragmento de ADN gen&oacute;mico de <i>Rhodococcus</i> sp. en <i>E. coli.</i> Este fragmento de 6.3 kb contiene los genes responsables de la decoloraci&oacute;n de colorantes azo. La cepa recombinante que se obtuvo tiene la capacidad de decolorar colorantes azo.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Ingenier&iacute;a Gen&eacute;tica y Metagen&oacute;mica: una perspectiva en el tratamiento biol&oacute;gico de colorantes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La bioremediaci&oacute;n ha llamado mucho la atenci&oacute;n en el campo de las ciencias ambientales. Los microorganismos capaces de degradar compuestos xenobi&oacute;ticos presentan dos problemas: la velocidad de degradaci&oacute;n es baja y la degradaci&oacute;n de mezclas de xenobi&oacute;ticos requieren de diferentes especies microbianas. La ingenier&iacute;a metab&oacute;lica ofrece la posibilidad de construir v&iacute;as de degradaci&oacute;n de xenobi&oacute;ticos completamente nuevas a partir de la introducci&oacute;n de diferentes enzimas provenientes de varios organismos (Nielsen 2002). La diversidad microbiana es inmensa y en ella se puede encontrar un gran n&uacute;mero de microorganismos, enzimas o genes con aplicaci&oacute;n industrial (Escalante&#45;Lozada <i>et al.</i> 2004). La Metagen&oacute;mica es la ciencia que investiga el genoma de las comunidades de microorganismos, m&aacute;s que de especies individuales. Se encarga de estudiar a nivel molecular las relaciones din&aacute;micas que definen las comunidades (Handelsman 2004; National Academy of Science 2007). En la actualidad se cuentan con las herramientas moleculares que permiten aislar, modificar y caracterizar el ADN de cualquier organismo, con lo que se puede estudiar la diversidad bacteriana a pesar de no poder cultivar la mayor&iacute;a de las bacterias de un ambiente particular. El estudio de la diversidad bacteriana con estas t&eacute;cnicas ha permitido obtener informaci&oacute;n sobre la composici&oacute;n y estructura de las comunidades bacterianas, as&iacute; como establecer el efecto de los factores ambientales sobre la biodiversidad. En la <a href="/img/revistas/uc/v28n2/a9f2.jpg" target="_blank">Figura 2</a> se muestra el procedimiento para construir y evaluar un banco metagen&oacute;mico (Handelsman 2004).</font></p>     <p align="justify"><font face="verdana" size="2">Esta herramienta puede aplicarse en el desarrollo de tecnolog&iacute;as para el tratamiento de aguas residuales. El an&aacute;lisis del metagenoma ha permitido la caracterizaci&oacute;n filogen&eacute;tica de la diversidad microbiana, la caracterizaci&oacute;n de nuevos genomas y de nuevas v&iacute;as metab&oacute;licas, la identificaci&oacute;n de mecanismos biol&oacute;gicos de resistencia a compuestos contaminantes y el descubrimiento de nuevas enzimas y biopol&iacute;meros (Escalante&#45;Lozada <i>et al.</i> 2004). Los proyectos pioneros en la metagen&oacute;mica como la metagen&oacute;mica del mar de Sargaso (Venter <i>et al.</i> 2004) y el an&aacute;lisis de la comunidad presente en el drenaje &aacute;cido de una mina (Tyson <i>et al.</i> 2004), permitieron generar conocimiento acerca de los ciclos biogeoqu&iacute;micos, las especies clave en estos procesos y el descubrimiento de nuevas especies con potencial aplicaci&oacute;n en la industria. La metagen&oacute;mica promete proveer nuevas mol&eacute;culas con funciones diversas, pero se requieren sistemas de expresi&oacute;n para cada una de estas enzimas y mol&eacute;culas nuevas para que puedan convertirse en un &eacute;xito econ&oacute;mico (Briones &amp; Raskin 2003; Lorenz &amp; Eck 2005; Wagner <i>et al.</i> 2006; McMahon <i>et al.</i> 2007). El an&aacute;lisis metagen&oacute;mico de diversos ambientes ha permitido la identificaci&oacute;n de microorganismos que juegan un papel primordial en el tratamiento biol&oacute;gico de aguas residuales, incluyendo especies no cultivables. Esto provee aspectos importantes sobre diversidad, funciones y diferenciaci&oacute;n del nicho de estos organismos (Daims <i>et al.</i> 2006; Wagner <i>et al.</i> 2006). La biodegradaci&oacute;n de colorantes en un entorno contaminado es un proceso que involucra a distintos metabolismos de una comunidad, por lo que la metagen&oacute;mica permitir&iacute;a utilizar la biodiversidad para lograr la biodegradaci&oacute;n de estos compuestos, encontrando aquellos genes involucrados en estos procesos de una manera dirigida y posteriormente utilizarlos para la obtenci&oacute;n de cepas "bajo dise&ntilde;o" para el tratamiento de diferentes tipos de aguas residuales.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>DISCUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La eliminaci&oacute;n de los colorantes de los efluentes de la industria textil representa un gran reto ambiental. Existen numerosas tecnolog&iacute;as para el tratamiento de aguas residuales de la industria textil pero, por la complejidad de la composici&oacute;n de estas aguas, generalmente se tiene que utilizar dos o m&aacute;s estrategias para lograr la remoci&oacute;n de los contaminantes. La industria textil consume grandes vol&uacute;menes de agua en sus procesos, por lo que es importante la b&uacute;squeda de tecnolog&iacute;as que permitan el reciclaje del agua residual, o bien, que permitan que el agua pueda ser vertida sin que perjudique al ambiente. Los procesos biol&oacute;gicos son una opci&oacute;n para el tratamiento de efluentes contaminados. Con este objetivo, se han obtenido cepas aisladas de entornos contaminados que, por adaptaci&oacute;n, han desarrollado la capacidad de biodegradar los contaminantes presentes. Tambi&eacute;n se ha conseguido identificar las enzimas involucradas en la degradaci&oacute;n de colorantes y desarrollar tecnolog&iacute;as utilizando dichas enzimas.</font></p>     <p align="justify"><font face="verdana" size="2">Las estructuras qu&iacute;micas de los colorantes resultan a menudo demasiado complejas para utilizar un tratamiento simple, por lo que generalmente se utilizan consorcios microbianos con la capacidad de degradar colorantes obteniendo altas eficiencias de depuraci&oacute;n. Muchos de estos consorcios no est&aacute;n completamente caracterizados y se desconoce el mecanismo por el cual se lleva a cabo la degradaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">El desarrollo de estas tecnolog&iacute;as se basa en t&eacute;cnicas convencionales, sin tomar en cuenta que la actividad biodegradativa de un grupo de organismos no depende de una sola especie, sino que generalmente es resultado de la acci&oacute;n conjunta de la diversidad metab&oacute;lica presente en el medio. Es por esto que el desarrollo de las ciencias como la metagen&oacute;mica, constituyen un paso importante para conocer aspectos claves sobre los microorganismos involucrados en el proceso de biodegradaci&oacute;n, as&iacute; como para encontrar nuevas enzimas, nuevos metabolismos y nuevos microorganismos capaces de metabolizar los colorantes.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Abadulla E, Jzanov T, Costa S, Robra KH, Caracto&#45;Paulo A, Gubitz GM (2000) Decolourization and detoxification of textile dyes with a laccase from <i>Trametes hirsutus.</i> Appl. Environ. Microbiol. 66: 3357&#45;3362.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=10128401&pid=S0186-2979201200020000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">An SY, Min SK, Cha IH, Choi YK, Cho YS, Kim CH, Lee YC (2002) Decolorization of triphenylamine and azo dyes by Citrobacter sp. Biotechnol. Lett. 24: 1037&#45;1040.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=10128403&pid=S0186-2979201200020000900002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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