<?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>2221-2442</journal-id>
<journal-title><![CDATA[Revista CENIC Ciencias Químicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. CENIC Cienc. Quím.]]></abbrev-journal-title>
<issn>2221-2442</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Investigaciones Científicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2221-24422022000200244</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[TRANSFORMATION OF PHENANTHRENE IN ENZYME-MEDIATOR-SUBSTRATE SYSTEMS BY USING QUERCETIN AS METABOLIC MEDIATOR]]></article-title>
<article-title xml:lang="es"><![CDATA[TRANSFORMACIÓN DE FENANTRENO EN SISTEMA ENZIMA-MEDIADOR-SUSTRATO USANDO QUERCETINA COMO MEDIADOR METABÓLICO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera Casado]]></surname>
<given-names><![CDATA[N. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Vargas]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Guzmán]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calva Calva]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,TESE Division of Chemical and Biochemical Engineering ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,CINVESTAV-IPN Biotechnology and Bioengineering ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<fpage>244</fpage>
<lpage>251</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2221-24422022000200244&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2221-24422022000200244&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2221-24422022000200244&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The removal mechanism of aromatic polycyclic hydrocarbons in phytoremediation processes are still uncertain. Previous studies suggested that metabolic mediators could participate in this process by forming enzyme-mediator-substrate complexes, where the mediator are small molecules derived from plant secondary metabolism that interact molecularly with the contaminant. The aim of this work was to investigate whether quercetin can act as metabolic mediators in the transformation of phenanthrene in the presence and absence of radish peroxidase as model enzyme. The results from the phenanthrene reactions with quercetin in the presence and absence of radish peroxidase showed 85% transformation of phenanthrene (50 µM). These results suggest that participation of peroxidase is not essential for the phenanthrene removal process, nevertheless under these conditions the rate of transformation might be regulated by the H2O2 concentration. Further, the transformation products suggest that the in vitro removal process, with and without enzyme, was a sequential oxidation of the molecule mediated by quercetin and stimulated by the presence of H2O2.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El mecanismo de remoción de hidrocarburos policíclicos aromáticos en los procesos de fitorremediación aún es incierto. Estudios previos sugirieron que mediadores metabólicos podrían participar en este proceso formando complejos enzima-mediador-sustrato, donde el mediador son pequeñas moléculas derivadas del metabolismo secundario de las plantas y que interactúan molecularmente con el contaminante. El objetivo de este trabajo fue investigar si la quercetina puede actuar como mediador metabólico en la transformación del fenantreno en presencia y ausencia de peroxidasas como enzima modelo. Los resultados de las reacciones de fenantreno con quercetina en presencia y ausencia de peroxidasa mostraron una transformación del 85% del fenantreno (50 &#956;M). Estos resultados sugieren que la participación de la peroxidasa no es esencial para el proceso de eliminación del fenantreno, sin embargo, bajo estas condiciones la tasa de transformación podría estar regulada por la concentración de H2O2. Además, los productos de transformación sugieren que el proceso de remoción in vitro, con y sin enzima, fue una oxidación secuencial de la molécula mediada por quercetina y estimulada por la presencia de H2O2.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyperaceae]]></kwd>
<kwd lng="en"><![CDATA[flavonoids]]></kwd>
<kwd lng="en"><![CDATA[phytoremediation]]></kwd>
<kwd lng="en"><![CDATA[metabolic mediators]]></kwd>
<kwd lng="en"><![CDATA[plant metabolites]]></kwd>
<kwd lng="es"><![CDATA[Cyperaceae]]></kwd>
<kwd lng="es"><![CDATA[flavonoides]]></kwd>
<kwd lng="es"><![CDATA[fitorremediación]]></kwd>
<kwd lng="es"><![CDATA[mediadores metabólicos]]></kwd>
<kwd lng="es"><![CDATA[metabolitos vegetales]]></kwd>
</kwd-group>
</article-meta>
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