<?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>S1870-249X2009000200005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Study of Sorption Equilibrium of Biopolymers Alginic Acid and Xanthan with C.I. Disperse Yellow 54]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Álvarez]]></surname>
<given-names><![CDATA[Juan Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jáuregui-Rincón]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Díaz]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Vázquez]]></surname>
<given-names><![CDATA[Refugio]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frausto-Reyes]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Departamento de Ingeniería Bioquímica ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Guanajuato Facultad de Química ]]></institution>
<addr-line><![CDATA[Guanajuato ]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Centro de Investigaciones en Óptica Unidad Aguascalientes ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<fpage>59</fpage>
<lpage>70</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2009000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2009000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2009000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Disperse yellow 54 (DY54) was adsorbed onto two biopolymers, alginic acid and xanthan. The adsorption isotherms for the biopolymer-DY54 system showed that the adsorption mechanism can best be described by Zimm-Bragg theory. UV-Visible, FT-IR and MicroRaman studies suggest that DY54 is bounded to both biopolymers alginic acid and xanthan through hydrogen bonding. Keto group of dye and hydroxyl groups of sugar residues from two polysaccharides were the principal functional groups involved in sorption mechanism.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El colorante Amarillo disperso 54 (DY54) fue adsorbido en dos biopolímeros, el ácido algínico y la xantana. Las isotermas de adsorción obtenidas para el sistema biopolímero-DY54 muestran que el mecanismo de adsorción puede ser descrito de la mejor manera por la teoría de Zimm-Bragg. Estudios UV-Visible, IR-TF y MicroRaman sugieren que el DY54 se une a ambos biopolímeros, el ácido algínico y la xantana por medio de puentes de hidrógeno. El grupo cetónico del colorante y los grupos oxhidrilo de los residuos de azúcar de los dos polisacáridos fueron los principales grupos funcionales involucrados en el mecanismo de adsorción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Sorption]]></kwd>
<kwd lng="en"><![CDATA[Biopolymers]]></kwd>
<kwd lng="en"><![CDATA[Disperse dye]]></kwd>
<kwd lng="en"><![CDATA[Zimm-Bragg Theory]]></kwd>
<kwd lng="en"><![CDATA[Hydrogen Bonding]]></kwd>
<kwd lng="es"><![CDATA[Adsorción]]></kwd>
<kwd lng="es"><![CDATA[biopolímeros]]></kwd>
<kwd lng="es"><![CDATA[colorante disperso]]></kwd>
<kwd lng="es"><![CDATA[teoría de Zimm-Bragg]]></kwd>
<kwd lng="es"><![CDATA[puentes de hidrógeno]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Study of Sorption Equilibrium of Biopolymers Alginic Acid and Xanthan with C.I. Disperse Yellow 54</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Juan Antonio Lozano&#150;&Aacute;lvarez,<sup>1</sup> Juan J&aacute;uregui&#150;Rinc&oacute;n,<sup>1* </sup> Guillermo Mendoza&#150;D&iacute;az,<sup>2 </sup>Refugio Rodr&iacute;guez&#150;V&aacute;zquez,<sup>3</sup> and Claudio Frausto&#150;Reyes<sup>4</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Departamento de Ingenier&iacute;a Bioqu&iacute;mica, Universidad Aut&oacute;noma de Aguascalientes, Av. Universidad 940 Ciudad Universitaria, Aguascalientes, M&eacute;xico.</i> <i><sup>*</sup>Responsible author:</i><a href="mailto:jjaureg@correo.uaa.mx">jjaureg@correo.uaa.mx</a>.</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Facultad de Qu&iacute;mica, Universidad de Guanajuato, Noria Alta S/N, Guanajuato, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>3 </sup>Centro de Investigaci&oacute;n y de Estudios Avanzados del Instituto Polit&eacute;cnico Nacional, M&eacute;xico, D.F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Centro de Investigaciones en &Oacute;ptica, Unidad Aguascalientes. Aguascalientes, M&eacute;xico.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received January 12, 2009    <br>   Accepted June 29, 2009</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>     <p align="justify"><font face="verdana" size="2">Disperse yellow 54 (DY54) was adsorbed onto two biopolymers, alginic acid and xanthan. The adsorption isotherms for the biopolymer&#150;DY54 system showed that the adsorption mechanism can best be described by Zimm&#150;Bragg theory. UV&#150;Visible, FT&#150;IR and MicroRaman studies suggest that DY54 is bounded to both biopolymers alginic acid and xanthan through hydrogen bonding. Keto group of dye and hydroxyl groups of sugar residues from two polysaccharides were the principal functional groups involved in sorption mechanism.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Sorption, Biopolymers, Disperse dye, Zimm&#150;Bragg Theory, Hydrogen Bonding.</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">El colorante Amarillo disperso 54 (DY54) fue adsorbido en dos biopol&iacute;meros, el &aacute;cido alg&iacute;nico y la xantana. Las isotermas de adsorci&oacute;n obtenidas para el sistema biopol&iacute;mero&#150;DY54 muestran que el mecanismo de adsorci&oacute;n puede ser descrito de la mejor manera por la teor&iacute;a de Zimm&#150;Bragg. Estudios UV&#150;Visible, IR&#150;TF y MicroRaman sugieren que el DY54 se une a ambos biopol&iacute;meros, el &aacute;cido alg&iacute;nico y la xantana por medio de puentes de hidr&oacute;geno. El grupo cet&oacute;nico del colorante y los grupos oxhidrilo de los residuos de az&uacute;car de los dos polisac&aacute;ridos fueron los principales grupos funcionales involucrados en el mecanismo de adsorci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Adsorci&oacute;n, biopol&iacute;meros, colorante disperso, teor&iacute;a de Zimm&#150;Bragg, puentes de hidr&oacute;geno.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v53n2/v53n2a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">We acknowledge the support of Consejo Nacional de Ciencia y Tecnolog&iacute;a, M&eacute;xico (Grants No. 063581 and 054792). Thanks to Ph.D. Iliana Medina&#150;Ram&iacute;rez for document improvement.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Willmott, N.; Guthrie, J.; Nelson, G. <i>J. Soc. Dye Colour. </i><b>1998, </b><i>114, </i>38&#150;41.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4907314&pid=S1870-249X200900020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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