<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2016000300135</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A Hydrogen Peroxide Biosensor Based on the Immobilization of the Highly Stable Royal Palm Tree Peroxidase (Roystonea regia) with Chitosan and Glutaraldehyde on Screen-printed Graphene Electrodes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villamizar]]></surname>
<given-names><![CDATA[Erika N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[John J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander Escuela de Química ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Industrial de Santander Escuela de Geología ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>60</volume>
<numero>3</numero>
<fpage>135</fpage>
<lpage>140</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2016000300135&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2016000300135&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2016000300135&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: This paper present the fabrication and electrochemical studies of a screen-printed graphene electrode (SPGE) modified with Royal palm tree peroxidase (RPTP) in combination with chitosan (CS) and cross-linking of glutaraldehyde (GA) for detection of hydrogen peroxide. Cyclic voltammograms in the presence of potassium ferrocyanide ([Fe(CN)6]3-/4-) as a redox species demonstrated an increasing of 50 &#956;A evidenced by the electron transfer process of SPGE modified with CS-GA-RPTP. The graphene modified electrode exhibits excellent electrocatalytic activity to the reduction of H2O2, with a linear response in the 100 &#956;M to 5 &#956;M concentration range and a detection limit of 87 &#956;M. The new sensor based on the modification of graphene electrode with the high stable RPTP will provide a potential amperometric detection system for determination of H2O2 in real samples with some biomedical or environmental importance.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Este trabajo presenta la fabricación y estudio electroquímico de un electrodo serigrafiado de grafeno modificado con peroxidasa de palma Real (Roystonea regia) y quitosano mediante el uso de glutaraldehído como agente entrecruzante, para la detección de peróxido de hidrógeno. Los voltamperogramas cíclicos, utilizando como electrolito soluciones de ferrocianuro de potasio [Fe(CN)6]3-/4-, mostraron un aumento de aproximadamente 50mA en el valor de la corriente que es evidenciado por los procesos de transferencia electrónica entre el electrodo y la enzima. El electrodo de grafeno modificado exhibió una excelente respuesta electrocatalítica hacia la reducción del H2O2, con un rango lineal en un intervalo de 100 &#956;M a 5 &#956;M y un nivel mínimo de detección de 87 &#956;M. El nuevo sensor basado en la modificación de electrodos serigrafiados de grafeno con la enzima altamente estable peroxidasa de palma real podría suministrar un potencial sistema de detección amperométrico para la determinación de H2O2 en muestras reales con interés biomédico o ambiental.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Royal palm tree peroxidase]]></kwd>
<kwd lng="en"><![CDATA[graphene]]></kwd>
<kwd lng="en"><![CDATA[sensor]]></kwd>
<kwd lng="en"><![CDATA[hydrogen peroxide]]></kwd>
<kwd lng="es"><![CDATA[Peroxidasa de palma real]]></kwd>
<kwd lng="es"><![CDATA[grafeno]]></kwd>
<kwd lng="es"><![CDATA[sensor]]></kwd>
<kwd lng="es"><![CDATA[peróxido de hidrógeno]]></kwd>
</kwd-group>
</article-meta>
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