<?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>1665-2738</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Ing. Quím]]></abbrev-journal-title>
<issn>1665-2738</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-27382013000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización fermentativa de levaduras productoras de etanol a partir de jugo de Agave cupreata en la elaboración de mezcal]]></article-title>
<article-title xml:lang="en"><![CDATA[Fermentative characterization of producers ethanol yeast from Agave cupreata juice in mezcal elaboration]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Hernández]]></surname>
<given-names><![CDATA[J.C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Parga]]></surname>
<given-names><![CDATA[M.C.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés-Penagos]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico de Morelia Departamento de Ing. Bioquímica Laboratorio de Bioquímica]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Químico Farmacobiología ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Ingeniería Química ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<volume>12</volume>
<numero>3</numero>
<fpage>451</fpage>
<lpage>461</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382013000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382013000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382013000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las cepas de levaduras convencionales y no convencionales son capaces de producir etanol bajo distintas condiciones operativas y nutricionales, con distintos rendimientos en la producción de biomasa y etanol. En el presente trabajo se estudió el comportamiento cinético de biomasa y etanol nivel matraz y nivel biorreactor durante la fermentación alcohólica. Se utilizó jugo de Agave cupreata y se establecieron como variables de estudio: tipo de levadura, concentración de azúcares y temperatura, a nivel matraz (Diseño Box-Behnken). En biorreactor, se estudió la aireación y agitación (Diseño factorial). Las variables de respuesta evaluadas en cada ensayo fueron el crecimiento celular; la cantidad producida de etanol; el consumo de azúcares y el pH. Ya destilado el producto, se procedió a realizar la identificación de compuestos volátiles (metanol, etanol y alcoholes superiores) por cromatografía de gases. Se encontró que la interacción concentración de azúcares-temperatura fue la variable con mayor influencia sobre el incremento en el porcentaje de etanol. La cepa de Kluyveromyces marxianus presentó el mayor rendimiento de etanol (12.46% v/v), en concentraciones de azúcares de 12 °Brix y una temperatura de 28 °C, y a nivel biorreactor, con agitación de 150 rpm y aireación de 0.1 vvm. El destilado presentó una concentración de metanol y etanol de 1.89% y 47.75% respectivamente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Conventional and unconventional yeast strains possess the ability to produce ethanol under different operating and nutritional conditions showing different yields in biomass and ethanol production. In the present work, the kinetics of biomass and ethanol productions were studied at flask and bioreactor levels during the fermentation of Agave cupreata juice. The established variables in a Box-Behnken design were: type of yeast, sugars concentration and temperature (at flask level). At biorreactor level, aeration and agitation were studied by using a factorial experimental design. The response variables evaluated in each test were biomass, ethanol and pH. Volatiles compounds (methanol, ethanol and higher alcohols) were quantified in the distilled fermented must by gas chromatography. It was found that the temperature-sugars interaction was the most significant factor influencing the ethanol concentration. Kluyveromyces marxianus yielded the highest ethanol concentration (12.46% v/v) at 12 °Brix and 28 °C, in bioreactor level, with agitation of 150 rpm and aeration of 0.1 vvm. The fermented must was distillated containing methanol and ethanol concentrations of 1.89% and 47.75% respectively.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cepa de levadura]]></kwd>
<kwd lng="es"><![CDATA[Agave cupreata]]></kwd>
<kwd lng="es"><![CDATA[diseño experimental]]></kwd>
<kwd lng="es"><![CDATA[fermentación alcohólica]]></kwd>
<kwd lng="en"><![CDATA[yeast strain]]></kwd>
<kwd lng="en"><![CDATA[Agave cupreata]]></kwd>
<kwd lng="en"><![CDATA[experimental design]]></kwd>
<kwd lng="en"><![CDATA[alcoholic fermentation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Biotecnolog&iacute;a</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="4"><b>Caracterizaci&oacute;n fermentativa de levaduras productoras de etanol a partir de jugo de <i>Agave cupreata</i> en la elaboraci&oacute;n de mezcal</b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="3"><b>Fermentative characterization of producers ethanol yeast from <i>Agave cupreata</i> juice in mezcal elaboration </b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="2"><b>E. P&eacute;rez<sup>1,2,3</sup>, J.C. Gonz&aacute;lez&#45;Hern&aacute;ndez<sup>1</sup>*, M.C. Ch&aacute;vez&#45;Parga<sup>3</sup> y C. Cort&eacute;s&#45;Penagos<sup>2</sup></b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>1 </sup>Laboratorio de Bioqu&iacute;mica del Departamento de Ing. Bioqu&iacute;mica del Instituto Tecnol&oacute;gico de Morelia, Av. Tecnol&oacute;gico # 1500, Colonia Lomas de Santiaguito, C. P. 58120, Morelia, Michoac&aacute;n, M&eacute;xico. *Corresponding author. E&#45;mail:</i> <a href="mailto:jcgh1974@yahoo.com">jcgh1974@yahoo.com</a> <i>Tel. (+52&#45;443) 3121570. Ext. 231., Fax (+52&#45;443) 3121570. Ext. 231.</i></font></p>          <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Facultad de Qu&iacute;mico Farmacobiolog&iacute;a de la Universidad Michoacana de San Nicol&aacute;s de Hidalgo. Morelia, Michoac&aacute;n, M&eacute;xico. </i></font></p>             ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>3 </sup>Facultad de Ingenier&iacute;a Qu&iacute;mica de la Universidad Michoacana de San Nicol&aacute;s de Hidalgo. Morelia, Michoac&aacute;n, 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">Recibido 17 de Marzo 2013     <br>     Aceptado 1 de<i> </i>Mayo 2013</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">Las cepas de levaduras convencionales y no convencionales son capaces de producir etanol bajo distintas condiciones operativas y nutricionales, con distintos rendimientos en la producci&oacute;n de biomasa y etanol. En el presente trabajo se estudi&oacute; el comportamiento cin&eacute;tico de biomasa y etanol nivel matraz y nivel biorreactor durante la fermentaci&oacute;n alcoh&oacute;lica. Se utiliz&oacute; jugo de <i>Agave cupreata</i> y se establecieron como variables de estudio: tipo de levadura, concentraci&oacute;n de az&uacute;cares y temperatura, a nivel matraz (Dise&ntilde;o Box&#45;Behnken). En biorreactor, se estudi&oacute; la aireaci&oacute;n y agitaci&oacute;n (Dise&ntilde;o factorial). Las variables de respuesta evaluadas en cada ensayo fueron el crecimiento celular; la cantidad producida de etanol; el consumo de az&uacute;cares y el pH. Ya destilado el producto, se procedi&oacute; a realizar la identificaci&oacute;n de compuestos vol&aacute;tiles (metanol, etanol y alcoholes superiores) por cromatograf&iacute;a de gases. Se encontr&oacute; que la interacci&oacute;n concentraci&oacute;n de az&uacute;cares&#45;temperatura fue la variable con mayor influencia sobre el incremento en el porcentaje de etanol. La cepa de <i>Kluyveromyces marxianus</i> present&oacute; el mayor rendimiento de etanol (12.46&#37; v/v), en concentraciones de az&uacute;cares de 12 &deg;Brix y una temperatura de 28 &deg;C, y a nivel biorreactor, con agitaci&oacute;n de 150 rpm y aireaci&oacute;n de 0.1 vvm. El destilado present&oacute; una concentraci&oacute;n de metanol y etanol de 1.89&#37; y 47.75&#37; respectivamente.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> cepa de levadura, <i>Agave cupreata,</i> dise&ntilde;o experimental, fermentaci&oacute;n alcoh&oacute;lica. </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>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Conventional and unconventional yeast strains possess the ability to produce ethanol under different operating and nutritional conditions showing different yields in biomass and ethanol production. In the present work, the kinetics of biomass and ethanol productions were studied at flask and bioreactor levels during the fermentation of <i>Agave cupreata</i> juice. The established variables in a Box&#45;Behnken design were: type of yeast, sugars concentration and temperature (at flask level). At biorreactor level, aeration and agitation were studied by using a factorial experimental design. The response variables evaluated in each test were biomass, ethanol and pH. Volatiles compounds (methanol, ethanol and higher alcohols) were quantified in the distilled fermented must by gas chromatography. It was found that the temperature&#45;sugars interaction was the most significant factor influencing the ethanol concentration. <i>Kluyveromyces marxianus</i> yielded the highest ethanol concentration (12.46&#37; v/v) at 12 &deg;Brix and 28 &deg;C, in bioreactor level, with agitation of 150 rpm and aeration of 0.1 vvm. The fermented must was distillated containing methanol and ethanol concentrations of 1.89&#37; and 47.75&#37; respectively.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> yeast strain, <i>Agave cupreata,</i> experimental design, alcoholic fermentation.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmiq/v12n3/v12n3a8.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">Arrizon, J. y Gschaedler, A. (2002). Increasing fermentation efficiency at high sugar concentrations by supplementing an additional source of nitrogen during the exponential phase of the tequila fermentation process. <i>Canadian Journal of Microbiology 48,</i> 965&#45;970.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8570954&pid=S1665-2738201300030000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">Arrizon, J. y Gschaedler, A. (2006). Effects of the addition of different nitrogen sources in the tequila fermentation process at high sugar concentration. <i>Journal of Applied Microbiology</i> 102, 1123&#45;1131.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8570956&pid=S1665-2738201300030000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
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