<?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>S1870-249X2022000200221</article-id>
<article-id pub-id-type="doi">10.29356/jmcs.v66i2.1694</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Selective Pb(II)-Imprinted Polymer for Solid Phase Extraction in the Trace Determination of Lead in Infant Formula by Capillary Electrophoresis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Aguilar]]></surname>
<given-names><![CDATA[Juan Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Islas]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paez-Hernandez]]></surname>
<given-names><![CDATA[María Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galán-Vidal]]></surname>
<given-names><![CDATA[Carlos Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibarra]]></surname>
<given-names><![CDATA[Israel Samuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo  ]]></institution>
<addr-line><![CDATA[ Hgo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Politécnica de Francisco I. Madero  ]]></institution>
<addr-line><![CDATA[ Hgo]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>66</volume>
<numero>2</numero>
<fpage>221</fpage>
<lpage>236</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2022000200221&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2022000200221&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2022000200221&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A lead ion-imprinted polymer (IIP) based on methacrylic acid (MAA) and 4-vinylpyridine (4VP) as functional monomers has been synthesized by a radical precipitation method. The complex Pb-MAA-4VP was polymerized with ethylene glycol dimethacrylate as the cross-linker agent. The material was used in solid phase extraction (SPE) coupled with capillary electrophoresis (CE) for the determination of lead in infant formula samples. The physical-chemical properties of the IIP were characterized by scanning electron microscopy, IR spectroscopy, and Freundlich and Dubinin-Raduskevich models. The IIP selectivity was determined in presence of Ca(II), Mg(II), Cd(II), Cr(III) and Cu(II), which are present in the infant formula sample. The proposed methodology (SPE-CE) for the determination of lead has a limit of detection of 0.5 µg L-1 and a limit of quantification of 1.5 µg L-1, with an intra and inter-day repeatability of less than 5 % RSD in all cases. Four of twenty samples were positive for lead with concentrations ranging from 10 to 43 µg kg-1, and the results were compared with ETAAS. ANOVA demonstrated no significant difference between the results obtained by SPE-CE and ETAAS (&#945; = 0.05 %).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se realizó la síntesis de un polímero impreso de iones (IIP) vía radicales libres para la extracción efectiva de plomo, empleando como monómeros funcionales ácido metacrilico (MAA) y 4-vinilpiridina (4VP). El complejo Pb-MAA-4VP fue polimerizado empleando al dimetacrilato de etilenglicol como agente entrecruzante. El polímero fue utilizado en un sistema de extracción en fase sólida (SPE) acoplado a electroforesis capilar (CE) en la determinación de plomo en muestras de fórmulas infantiles. El IIP óptimo fue caracterizado respecto a su morfología y propiedades fisicoquímicas mediante microscopia electrónica de barrido, espectroscopia IR e isotermas de adsorción (modelo Freundlich y Dubinin-Raduskevich). La selectividad del IIP se estudió en presencia de iones metálicos contenidos en las fórmulas infantiles tales como: Ca(II), Mg(II), Cd(II), Cr(III) y Cu(II). La metodología propuesta en el presente trabajo (IIP-SPE-CE) mostró límites de detección de 0.5 µg L-1 y límites de cuantificación de 1.5 µg L-1, con una repetitividad y reproducibilidad adecuadas (&lt; 5 % DER) en todos los casos. Cuatro de las veinte muestras analizadas dieron positivo a la presencia de plomo con concentraciones entre 10 a 43 µg L-1, dichos resultados fueron comparados con una metodología de referencia (ETAAS). El análisis de ANOVA demostró que no existe diferencia significativa entre los resultados obtenidos por IIP-SPE-CE y ETAAS (&#945;=0.05 %).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Lead]]></kwd>
<kwd lng="en"><![CDATA[ion-imprinted polymer]]></kwd>
<kwd lng="en"><![CDATA[capillary electrophoresis]]></kwd>
<kwd lng="en"><![CDATA[infant formula samples]]></kwd>
<kwd lng="es"><![CDATA[Plomo]]></kwd>
<kwd lng="es"><![CDATA[polímero impreso de iones]]></kwd>
<kwd lng="es"><![CDATA[electroforesis capilar]]></kwd>
<kwd lng="es"><![CDATA[muestras de fórmulas infantiles]]></kwd>
</kwd-group>
</article-meta>
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