<?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>S1665-27382015000200012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Optimization of a bacterial biosurfactant production]]></article-title>
<article-title xml:lang="es"><![CDATA[Optimización de la producción de un biosurfactante bacteriano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Trujillo]]></surname>
<given-names><![CDATA[Ma. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Membrillo Venegas]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vigueras-Carmona]]></surname>
<given-names><![CDATA[S.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zafra-Jimenez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Rivero]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Tecnológico de Estudios Superiores de Ecatepec División de Ingeniería Química y Bioquímica ]]></institution>
<addr-line><![CDATA[Ecatepec Estado de México]]></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>355</fpage>
<lpage>362</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382015000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382015000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382015000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Bacterial biosurfactant production was optimized by means of Response Surface Methodology (RSM), in which nitrogen and carbon concentrations, as long as the addition of an immiscible substrate, supplemented for increasing the efficiency of biosurfactant biosynthesis, were the evaluated variables. A mixture of yeast extract-NaNO3, and fructose was used as nitrogen and carbon source, respectively. Under the assayed conditions yeast extract-NaNO3 relationship and hexadecane concentrations were the factors which had a significant effect on biosurfactant production at flask level. The optimal conditions, estimated by the canonical analysis of the corresponding response surface were used at a 600 mL bioreactor, obtaining a biosurfactant production measured as 74.23 % of emulsification index, which was similar to the estimated by de quadratic model.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se optimizó la producción de un surfactante bacteriano por medio de la Metodología de Superficie de Respuesta (MSR), como variables de estudio para incrementar la eficiencia de biosíntesis del biosurfactante se evaluaron las concentraciones de carbono y nitrógeno, así como la adición de un sustrato insoluble. La fuente de nitrógeno fue una mezcla de extracto de levadura-NaNO3 y como fuente de carbono se uso fructosa. Bajo las condiciones ensayadas la relacion extracto de levadura- NaNO3 y la concentración de hexadecano fueron los factores que tuvieron un efecto significativo en la producción del biosurfactante a nivel matraz. Por medio del análisis canónico se estimaron las condiciones óptimas de la superficie de respuesta, que fueron usadas en un biorreactor de 600 mL, en el cual se obtuvo una producción de biosurfactante de 74.23% medido por el índice de emulsificación, cuyo valor fue similar al estimado por el modelo cuadrático.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[response surface methodology]]></kwd>
<kwd lng="en"><![CDATA[canonical analysis]]></kwd>
<kwd lng="en"><![CDATA[nitrogen and carbon source concentration]]></kwd>
<kwd lng="es"><![CDATA[metodología de superficie de respuesta]]></kwd>
<kwd lng="es"><![CDATA[análisis canónico]]></kwd>
<kwd lng="es"><![CDATA[concentración de la fuente nitrógeno y de carbono]]></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>Optimization of a bacterial biosurfactant production</b></font></p>     <p align="center">&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Optimizaci&oacute;n de la producci&oacute;n de un biosurfactante bacteriano</b></font></p>     <p align="center">&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Ma. A. Mart&iacute;nez&#45;Trujillo, I. Membrillo Venegas, S.E. Vigueras&#45;Carmona, G. Zafra&#45;Jimenez and M. Garc&iacute;a&#45;Rivero*</b></font></p>     <p align="center">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Divisi&oacute;n de Ingenier&iacute;a Qu&iacute;mica y Bioqu&iacute;mica, Tecnol&oacute;gico de Estudios Superiores de Ecatepec, Av. Tecnol&oacute;gico. s/n Col. Valle de An&aacute;huac CP 55210, Ecatepec, Edo. de M&eacute;xico, M&eacute;xico. *Corresponding author.</i> E&#45;mail: <a href="mailto:mayolagariv@yahoo.com.mx">mayolagariv@yahoo.com.mx</a></font></p>     <p align="justify">&nbsp;</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received August 20, 2014    <br>Accepted May 14, 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">Bacterial biosurfactant production was optimized by means of Response Surface Methodology (RSM), in which nitrogen and carbon concentrations, as long as the addition of an immiscible substrate, supplemented for increasing the efficiency of biosurfactant biosynthesis, were the evaluated variables. A mixture of yeast extract&#45;NaNO<sub>3</sub>, and fructose was used as nitrogen and carbon source, respectively. Under the assayed conditions yeast extract&#45;NaNO<sub>3</sub> relationship and hexadecane concentrations were the factors which had a significant effect on biosurfactant production at flask level. The optimal conditions, estimated by the canonical analysis of the corresponding response surface were used at a 600 mL bioreactor, obtaining a biosurfactant production measured as 74.23 % of emulsification index, which was similar to the estimated by de quadratic model.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words:</b> response surface methodology, canonical analysis, nitrogen and carbon source concentration.</font></p>     <p align="justify">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Se optimiz&oacute; la producci&oacute;n de un surfactante bacteriano por medio de la Metodolog&iacute;a de Superficie de Respuesta (MSR), como variables de estudio para incrementar la eficiencia de bios&iacute;ntesis del biosurfactante se evaluaron las concentraciones de carbono y nitr&oacute;geno, as&iacute; como la adici&oacute;n de un sustrato insoluble. La fuente de nitr&oacute;geno fue una mezcla de extracto de levadura&#45;NaNO<sub>3</sub> y como fuente de carbono se uso fructosa. Bajo las condiciones ensayadas la relacion extracto de levadura&#45; NaNO<sub>3</sub> y la concentraci&oacute;n de hexadecano fueron los factores que tuvieron un efecto significativo en la producci&oacute;n del biosurfactante a nivel matraz. Por medio del an&aacute;lisis can&oacute;nico se estimaron las condiciones &oacute;ptimas de la superficie de respuesta, que fueron usadas en un biorreactor de 600 mL, en el cual se obtuvo una producci&oacute;n de biosurfactante de 74.23% medido por el &iacute;ndice de emulsificaci&oacute;n, cuyo valor fue similar al estimado por el modelo cuadr&aacute;tico. </font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> metodolog&iacute;a de superficie de respuesta, an&aacute;lisis can&oacute;nico, concentraci&oacute;n de la fuente nitr&oacute;geno y de carbono.</font></p>   	    ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><a href="../pdf/rmiq/v14n2/v14n2a12.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>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Abbasi, H., Hamedi, M. M., Lotfabad, T. B., Zahiri, H. S., Sharafi, H., Masoomi, F. and Noghabi, K. A. (2012). 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