<?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>S1665-27382015000200016</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of initial substrate concentration and agitation on xylitol production by fermentation of hydrolyzed tamarind seed media with Kluyveromyces marxianus]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de la concentración inicial de sustrato y agitación sobre la producción de xilitol por fermentación de medio hidrolizado de semilla de tamarindo con Kluyveromyces marxianus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Corona]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Hernández]]></surname>
<given-names><![CDATA[J.C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Radames-Trejo]]></surname>
<given-names><![CDATA[V.]]></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="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="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamudio-Jaramillo]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Químico Farmacobiología ]]></institution>
<addr-line><![CDATA[San Nicolás Hidalgo Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Tecnológico de Morelia Laboratorio de Bioquímica del Departamento de Ing. Química y Bioquímica ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Tecnológico Nacional de México  ]]></institution>
<addr-line><![CDATA[Mexico D.F.]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Posgrado de la Facultad de Ingeniería Química ]]></institution>
<addr-line><![CDATA[San Nicolás de Hidalgo Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>14</volume>
<numero>2</numero>
<fpage>393</fpage>
<lpage>403</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382015000200016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382015000200016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382015000200016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Tamarind seed consists of 50 to 72 % of a branched heteropolysaccharide, called xyloglucan. By fragmenting xyloglucan with a coupled process of acid hydrolysis and thermal treatment, it is possible to obtain considerable amounts of fermentable sugars, glucose and xylose being the most abundant Xylose is the precursor of xylitol, a sugar with similar characteristics to sucrose. Chemical synthesis of xylitol is very expensive and of low-yield. On the other hand, xylitol can be obtained by fermentation, using yeasts that incorporate xylose in their metabolism, such as Kluyveromyces marxianus. Being a biological process, xylitol production by fermentation depends on different environmental factors. In this paper, the effect of two factors on xylitol production was evaluated based on a 3² factorial experimental design: initial substrate concentration (20-80 g/L) and agitation (120-240 rpm). Both factors considerably influenced xylitol production of K. marxianus, where the optimization of the experimental design predicted a yield of 0.57 g of xylitol/g of xylose, with an initial substrate concentration of 50 g/L and an agitation of 177 rpm, from a source substrate of which there are no reports of its use in this field, such as tamarind seed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La semilla de tamarindo esta compuesta en un 50 a 72 % por un heteropolisacárido ramificado, llamado xiloglucano. Mediante su fragmentación con un proceso acoplado de hidrólisis ácida y tratamiento térmico, es posible obtener cantidades considerables de azúcares fermentables, siendo la glucosa y la xilosa los más abundantes. La xilosa es el precursor del xilitol, un azúcar con características similares a la sacarosa. La síntesis química del xilitol es costosa y de bajo rendimiento. Por otro lado, se puede obtener xilitol por fermentación usando levaduras que incorporan la xilosa a su metabolismo, como Kluyveromyces marxianus. Al ser un proceso biológico, la producción de xilitol depende de diferentes factores ambientales; en este estudio, se evaluó el efecto de dos factores usando un diseño experimental factorial 3²: concentración inicial de sustrato (20-80 g/L) y agitación (120-240 rpm). Ambos factores tuvieron un impacto considerable sobre la producción de xilitol de K. marxianus, donde la optimización del diseño experimental predijo un rendimiento de 0.57 g de xilitol/g de xilosa, a una concentración inicial de sustrato de 50 g/L y agitación de 177 rpm, usando una fuente de sustrato que no ha sido reportada: la semilla de tamarindo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[xylose]]></kwd>
<kwd lng="en"><![CDATA[fermentation]]></kwd>
<kwd lng="en"><![CDATA[xylitol]]></kwd>
<kwd lng="en"><![CDATA[initial substrate concentration]]></kwd>
<kwd lng="en"><![CDATA[agitation]]></kwd>
<kwd lng="es"><![CDATA[xilosa]]></kwd>
<kwd lng="es"><![CDATA[fermentación]]></kwd>
<kwd lng="es"><![CDATA[xilitol]]></kwd>
<kwd lng="es"><![CDATA[concentración inicial de sustrato]]></kwd>
<kwd lng="es"><![CDATA[agitación]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Biotecnolog&iacute;a</font></p> 	    <p align="justify">&nbsp;</p>     <p align="center"><font face="verdana" size="4"><b>Effect of initial substrate concentration and agitation on xylitol production by fermentation of hydrolyzed tamarind seed media with  <i>Kluyveromyces marxianus</i></b></font></p>     <p align="center">&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Efecto de la concentraci&oacute;n inicial de sustrato y agitaci&oacute;n sobre la producci&oacute;n de xilitol por fermentaci&oacute;n de medio hidrolizado de semilla de tamarindo con  <i>Kluyveromyces marxianus</i></b></font></p>     <p align="center">&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>R. Mart&iacute;nez&#45;Corona<sup>1,2</sup>, J.C. Gonz&aacute;lez&#45;Hern&aacute;ndez<sup>2</sup>*, V. Radames&#45;Trejo<sup>3</sup>, C. Cort&eacute;s&#45;Penagos<sup>1</sup>, M.C. Ch&aacute;vez&#45;Parga<sup>4</sup>, M.A. Zamudio&#45;Jaramillo<sup>2</sup></b></font></p>     <p align="center">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Facultad de Qu&iacute;mico Farmacobiolog&iacute;a de la Universidad Michoacana de San Nicol&aacute;s de Hidalgo. </i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Laboratorio de Bioqu&iacute;mica del Departamento de Ing. Qu&iacute;mica</i> y <i>Bioqu&iacute;mica del Instituto Tecnol&oacute;gico de Morelia, Av. Tecnol&oacute;gico &#35; 1500, Colonia Lomas de Santiaguito, C. P. 58120, Morelia, Michoac&aacute;n, M&eacute;xico.  *Corresponding author.</i> E-mail: <a href="mailto:jcgh1974@yahoo.com">jcgh1974@yahoo.com</a>,  <i>Tel. (+52-433) 3121570. Ext. 231., Fax (+52-433) 3121570. Ext. 211.</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Tecnol&oacute;gico Nacional de M&eacute;xico. Arcos de Bel&eacute;n # 79, Delegation Cuauhtemoc, C.P. 06010, Mexico, D.F.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i> <sup>4 </sup>Posgrado de la Facultad de Ingenier&iacute;a Qu&iacute;mica de la Universidad Michoacana de San Nicol&aacute;s de Hidalgo.</i></font></p>     <p align="justify">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Received July 27, 2014    <br> Accepted April 21, 2015</font></p>     <p align="justify">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Tamarind seed consists of 50 to 72 % of a branched heteropolysaccharide, called xyloglucan. By fragmenting xyloglucan with a coupled process of acid hydrolysis and thermal treatment, it is possible to obtain considerable amounts of fermentable sugars, glucose and xylose being the most abundant Xylose is the precursor of xylitol, a sugar with similar characteristics to sucrose. Chemical synthesis of xylitol is very expensive and of low&#45;yield. On the other hand, xylitol can be obtained by fermentation, using yeasts that incorporate xylose in their metabolism, such as <i>Kluyveromyces marxianus.</i> Being a biological process, xylitol production by fermentation depends on different environmental factors. In this paper, the effect of two factors on xylitol production was evaluated based on a 3<sup>2</sup> factorial experimental design: initial substrate concentration (20&#45;80 g/L) and agitation (120&#45;240 rpm). Both factors considerably influenced xylitol production of <i>K. marxianus,</i> where the optimization of the experimental design predicted a yield of 0.57 g of xylitol/g of xylose, with an initial substrate concentration of 50 g/L and an agitation of 177 rpm, from a source substrate of which there are no reports of its use in this field, such as tamarind seed.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> xylose, fermentation, xylitol, initial substrate concentration, agitation. </font></p> 	    <p align="justify">&nbsp;</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La semilla de tamarindo esta compuesta en un 50 a 72 % por un heteropolisac&aacute;rido ramificado, llamado xiloglucano. Mediante su fragmentaci&oacute;n con un proceso acoplado de hidr&oacute;lisis &aacute;cida y tratamiento t&eacute;rmico, es posible obtener cantidades considerables de az&uacute;cares fermentables, siendo la glucosa y la xilosa los m&aacute;s abundantes. La xilosa es el precursor del xilitol, un az&uacute;car con caracter&iacute;sticas similares a la sacarosa. La s&iacute;ntesis qu&iacute;mica del xilitol es costosa y de bajo rendimiento. Por otro lado, se puede obtener xilitol por fermentaci&oacute;n usando levaduras que incorporan la xilosa a su metabolismo, como <i>Kluyveromyces marxianus.</i> Al ser un proceso biol&oacute;gico, la producci&oacute;n de xilitol depende de diferentes factores ambientales; en este estudio, se evalu&oacute; el efecto de dos factores usando un dise&ntilde;o experimental factorial 3<sup>2</sup>: concentraci&oacute;n inicial de sustrato (20&#45;80 g/L) y agitaci&oacute;n (120&#45;240 rpm). Ambos factores tuvieron un impacto considerable sobre la producci&oacute;n de xilitol de <i>K. marxianus,</i> donde la optimizaci&oacute;n del dise&ntilde;o experimental predijo un rendimiento de 0.57 g de xilitol/g de xilosa, a una concentraci&oacute;n inicial de sustrato de 50 g/L y agitaci&oacute;n de 177 rpm, usando una fuente de sustrato que no ha sido reportada: la semilla de tamarindo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> xilosa, fermentaci&oacute;n, xilitol, concentraci&oacute;n inicial de sustrato, agitaci&oacute;n.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><a href="../pdf/rmiq/v14n2/v14n2a16.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We wish to thank CONACYT&#45;CIENCIA B&Aacute;SICA (CB&#45;2012&#45;01., No.176199), PROMEP, IDCA 10761 (2012) for their partial financial support and the "Programa Institucional de Maestr&iacute;a en Ciencias Biologicas" (PIMCB) of the "Universidad Michoacana de San Nicol&aacute;s de Hidalgo" through CONACYT Scholarship (Consejo Nacional de Ciencia y Tecnolog&iacute;a) with registration number 388230 (Ricardo Mart&iacute;nez Corona).</font></p>     <p align="justify">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    ]]></body>
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