<?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>1665-3521</journal-id>
<journal-title><![CDATA[Superficies y vacío]]></journal-title>
<abbrev-journal-title><![CDATA[Superf. vacío]]></abbrev-journal-title>
<issn>1665-3521</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-35212006000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de las isotermas de sorción en cereales para desayuno]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto García]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gordillo Martínez]]></surname>
<given-names><![CDATA[Alberto José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto Méndez]]></surname>
<given-names><![CDATA[Judith]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Aldapa]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Román Gutiérrez]]></surname>
<given-names><![CDATA[Alma Delia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Ciencias Ambientales ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Química de Alimentos ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<volume>19</volume>
<numero>1</numero>
<fpage>12</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-35212006000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-35212006000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-35212006000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los cereales son alimentos altamente higroscópicos que alcanzan el equilibrio de adsorción rápidamente. En este estudio se evaluaron tres cereales para desayuno, los cuales a aW=0.10, ceden humedad al medio. A partir de valores de aW de 0.53, manifiestan sus capacidades de adsorción de humedad con el tiempo. El arroz manifestó los menores valores de capacidad de adsorción por el contrario el maíz presento la más alta capacidad de hidratación. Las isotermas de adsorción según el modelo de GAB permitieron determinar los valores de adsorción de agua de los cereales a nivel de la monocapa (MO), en donde el mayor grado de adsorción fue para maíz, seguido del trigo y finalmente arroz. La elevada capacidad de sorción del cereal de maíz a nivel de la monocapa está relacionada con el alto contenido de azúcares en el cereal (41%) y las propiedades típicas de sorción de estos. A valores altos (aW 0.80) la capacidad de adsorción de agua para los tres cereales es similar.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cereals are highly hygroscopic foods that quickly reach adsorption equilibrium. In this study the sorption kinetics of three breakfast cereals was evaluated. At low water activity (aW=0.10) these cereals yielded moisture to the environment. At aW=0.53, their water adsorption capacity varied with time. Rice cereal showed the lowest adsorption capacity whereas corn cereal showed the highest capacity of them all. The GAB model allowed to determine the water adsorption values at the monolayer level (MO), the highest adsorption degree was obtained by corn, followed by wheat and finally by rice. The high adsorption capacity of corn cereal at the monolayer level is related to the high sugar content in the cereal (41%) and to its typical sorption properties. At high water activity (aW 0.80) the water adsorption capacity of the three cereals was similar.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Arroz]]></kwd>
<kwd lng="es"><![CDATA[Maíz]]></kwd>
<kwd lng="es"><![CDATA[Trigo]]></kwd>
<kwd lng="es"><![CDATA[Adsorción]]></kwd>
<kwd lng="es"><![CDATA[Actividad del agua]]></kwd>
<kwd lng="es"><![CDATA[Isoterma]]></kwd>
<kwd lng="es"><![CDATA[GAB]]></kwd>
<kwd lng="en"><![CDATA[Rice]]></kwd>
<kwd lng="en"><![CDATA[Corn]]></kwd>
<kwd lng="en"><![CDATA[Wheat]]></kwd>
<kwd lng="en"><![CDATA[Adsorption]]></kwd>
<kwd lng="en"><![CDATA[Water activity]]></kwd>
<kwd lng="en"><![CDATA[Isotherm]]></kwd>
<kwd lng="en"><![CDATA[GAB]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Evaluaci&oacute;n de las isotermas de sorci&oacute;n en cereales para desayuno</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Francisco Prieto Garc&iacute;a<sup>1</sup>*; Alberto Jos&eacute; Gordillo Mart&iacute;nez<sup>1</sup>, Judith Prieto M&eacute;ndez<sup>2</sup>, Carlos Alberto G&oacute;mez Aldapa<sup>2</sup> y Alma Delia Rom&aacute;n Guti&eacute;rrez<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>C.A. Ciencias Ambientales, Universidad Aut&oacute;noma del Estado de Hidalgo. Centro de Investigaciones Qu&iacute;micas Carretera Pachuca&#45;Tulancingo km 4.5, Ciudad Universitaria, C.P. 47076, Pachuca, Hidalgo, M&eacute;xico</i> *<a href="mailto:prietog@uaeh.reduaeh.mx">prietog@uaeh.reduaeh.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>C.A. Qu&iacute;mica de Alimentos, Universidad Aut&oacute;noma del Estado de Hidalgo. Centro de Investigaciones Qu&iacute;micas Carretera Pachuca&#45;Tulancingo km 4.5, Ciudad Universitaria, C.P. 47076, Pachuca, Hidalgo, M&eacute;xico.</i></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">Los cereales son alimentos altamente higrosc&oacute;picos que alcanzan el equilibrio de adsorci&oacute;n r&aacute;pidamente. En este estudio se evaluaron tres cereales para desayuno, los cuales a a<sub>W</sub>=0.10, ceden humedad al medio. A partir de valores de a<sub>W</sub> de 0.53, manifiestan sus capacidades de adsorci&oacute;n de humedad con el tiempo. El arroz manifest&oacute; los menores valores de capacidad de adsorci&oacute;n por el contrario el ma&iacute;z presento la m&aacute;s alta capacidad de hidrataci&oacute;n. Las isotermas de adsorci&oacute;n seg&uacute;n el modelo de GAB permitieron determinar los valores de adsorci&oacute;n de agua de los cereales a nivel de la monocapa (MO), en donde el mayor grado de adsorci&oacute;n fue para ma&iacute;z, seguido del trigo y finalmente arroz. La elevada capacidad de sorci&oacute;n del cereal de ma&iacute;z a nivel de la monocapa est&aacute; relacionada con el alto contenido de az&uacute;cares en el cereal (41%) y las propiedades t&iacute;picas de sorci&oacute;n de estos. A valores altos (a<sub>W</sub> 0.80) la capacidad de adsorci&oacute;n de agua para los tres cereales es similar.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Arroz; Ma&iacute;z; Trigo; Adsorci&oacute;n; Actividad del agua; Isoterma; GAB.</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">Cereals are highly hygroscopic foods that quickly reach adsorption equilibrium. In this study the sorption kinetics of three breakfast cereals was evaluated. At low water activity (<span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">a<sub>W</sub></span>=0.10) these cereals yielded moisture to the environment. At a<sub>W</sub>=0.53, their water adsorption capacity varied with time. Rice cereal showed the lowest adsorption capacity whereas corn cereal showed the highest capacity of them all. The GAB model allowed to determine the water adsorption values at the monolayer level (MO), the highest adsorption degree was obtained by corn, followed by wheat and finally by rice. The high adsorption capacity of corn cereal at the monolayer level is related to the high sugar content in the cereal (41%) and to its typical sorption properties. At high water activity (a<sub>W</sub> 0.80) the water adsorption capacity of the three cereals was similar.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Rice; Corn; Wheat; Adsorption; Water activity; Isotherm; GAB.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/sv/v19n1/v19n1a3.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>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#91;1&#93; Labuza, T. P. Moisture Sorption: Practical aspects of isotherm measurement and use. Ed. American Association of Cereal Chemists. 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<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Labuza]]></surname>
<given-names><![CDATA[T. P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Moisture Sorption: Practical aspects of isotherm measurement and use]]></source>
<year>1984</year>
<page-range>1</page-range><publisher-loc><![CDATA[^eMinnesota Minnesota]]></publisher-loc>
<publisher-name><![CDATA[American Association of Cereal Chemists]]></publisher-name>
</nlm-citation>
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<person-group person-group-type="author">
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<surname><![CDATA[Waletzco]]></surname>
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<name>
<surname><![CDATA[Labuza]]></surname>
<given-names><![CDATA[T. P.]]></given-names>
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</person-group>
<source><![CDATA[J. Food Sci.]]></source>
<year>1976</year>
<volume>40</volume>
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