<?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>S1665-27382009000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de la calidad sanitaria de quesos crema tropical mexicano de la región de Tonalá, Chiapas]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of health quality of mexican tropical cream cheeses in the region of Tonala, Chiapas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Castillo]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva-Ruelas]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Castillo]]></surname>
<given-names><![CDATA[J. G.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos-Moreno]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Ingeniería Agroindustrial ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma Chapingo Centro Regional Universitario Oriente ]]></institution>
<addr-line><![CDATA[Huatusco Veracruz]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2009</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<fpage>111</fpage>
<lpage>119</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382009000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382009000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382009000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se colectaron muestras de queso crema tropical, de cinco queserías seleccionadas aleatoriamente en Tonalá, Chiapas. Con dos modalidades, quesos elaborados con leche pasteurizada y sin pasteurizar. Los muestreos se realizaron en enero, febrero, marzo y abril de 2007. Los objetivos del presente trabajo fueron: Evaluar microbiológicamente el queso crema tropical en producto terminado, en función de la presencia de bacterias mesófilas aerobias, patógenas como Salmonella spp. y E.coli. Además, determinar las características fisicoquímicas del queso crema tropical y su influencia en el desarrollo de Salmonella spp. y E.coli. Las variables microbiológicas evaluadas fueron: número de Bacterias Coliformes Fecales (BCF), E. coli, Bacterias Mesófilas Aerobias (BMA) y detección de Salmonella, y fisicoquímicas: actividad acuosa (Aw), pH, acidez total, humedad, grasa, contenido de proteína, calcio, cloruro de sodio (NaCl) y cenizas %. Los datos se analizaron mediante un análisis univariado de varianza (ANOVA) y análisis canónico discriminante (ACD). Los quesos no cumplieron con las normas microbiológicas para BCF, E.coli y Salmonella. El ANOVA mostró diferencias significativas (&#945; < 0.05) entre las queserías con respecto al número de bacterias coliformes fecales. En cuanto al número de BMA el (ANOVA), no mostró diferencias significativas (&#945; = 0.05) entre los cinco tratamientos. El análisis canónico discriminante (ACD), mostró que los quesos crema tropical presentaron diferencias en sus características microbiológicas y fisicoquímicas, en función de las distintas fechas de muestreo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Tropical cream cheese samples were obtained from five cheese-making enterprises randomly selected in Tonalá, Chiapas. With two modalities: cheeses made from pasteurized milk and cheeses made from raw milk. Samples were taken in January, February, March and April of 2007. The objectives of this research work were: to microbiologically evaluate the tropical cream cheese in finished product form, in function of the presence of mesophilic aerobic bacteria, pathogens such as Salmonella sp. and E. coli; and to determine the physiochemical characteristics of the tropical cream cheese and their influence on the development of Salmonella sp. and E. coli. Microbiological variables were number of fecal coliform bacteria (FCB), E. coli, number of mesophilic aerobic bacteria (MAB) and detection of Salmonella sp. The physiochemical variables were water activity (Aw), pH, total acidity, protein, moisture, fat content, sodium chloride (NaCl), calcium and ashes %. The data were analyzed by univariate Analysis of Variance (ANOVA) and canonical discriminant analysis (CDA). The cheese did not meet microbiological standards for FCB, E. coli and Salmonella. The ANOVA showed significant differences (&#945; < 0.05) among the cheeses with respect to the number of fecal coliform bacteria. The number of MAB, (ANOVA) showed no significant differences (&#945; = 0.05) among the five treatments. The canonical discriminate analysis (CDA) showed that the tropical cream cheeses presented differences in their physiochemical and microbiological characteristics, depending on the different sampling dates.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[queso crema tropical]]></kwd>
<kwd lng="es"><![CDATA[variables fisicoquímicas y microbiológicas]]></kwd>
<kwd lng="en"><![CDATA[tropical cream cheese]]></kwd>
<kwd lng="en"><![CDATA[physicochemical and microbiological variables]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Ingenier&iacute;a de alimentos</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Evaluaci&oacute;n de la calidad sanitaria de quesos crema tropical mexicano de la regi&oacute;n de Tonal&aacute;, Chiapas</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Evaluation of health quality of mexican tropical cream cheeses in the region of Tonala, Chiapas</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>P. A. Romero&#150;Castillo<sup>1</sup>*, G. Leyva&#150;Ruelas<sup>1</sup>, J. G. Cruz&#150;Castillo<sup>2</sup> y A. Santos&#150;Moreno<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Departamento de Ingenier&iacute;a Agroindustrial (Posgrado en Ciencia y Tecnolog&iacute;a Agroalimentaria). Universidad Aut&oacute;noma Chapingo. * <i>Autor para la correspondencia. E&#150;mail: </i></i><a href="mailto:roca555@yahoo.com.mx">roca555@yahoo.com.mx</a></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Centro Regional Universitario Oriente. Universidad Aut&oacute;noma Chapingo, Huatusco, Veracruz.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido 9 de Julio 2008    <br> Aceptado 19 de Enero 2009</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">Se colectaron muestras de queso crema tropical, de cinco queser&iacute;as seleccionadas aleatoriamente en Tonal&aacute;, Chiapas. Con dos modalidades, quesos elaborados con leche pasteurizada y sin pasteurizar. Los muestreos se realizaron en enero, febrero, marzo y abril de 2007. Los objetivos del presente trabajo fueron: Evaluar microbiol&oacute;gicamente el queso crema tropical en producto terminado, en funci&oacute;n de la presencia de bacterias mes&oacute;filas aerobias, pat&oacute;genas como <i>Salmonella spp. y E.coli. </i>Adem&aacute;s, determinar las caracter&iacute;sticas fisicoqu&iacute;micas del queso crema tropical y su influencia en el desarrollo de <i>Salmonella spp. y E.coli. </i>Las variables microbiol&oacute;gicas evaluadas fueron: n&uacute;mero de Bacterias Coliformes Fecales (BCF), <i>E. coli, </i>Bacterias Mes&oacute;filas Aerobias (BMA) y detecci&oacute;n de <i>Salmonella, </i>y fisicoqu&iacute;micas: actividad acuosa (A<sub>w</sub>), pH, acidez total, humedad, grasa, contenido de prote&iacute;na, calcio, cloruro de sodio (NaCl) y cenizas %. Los datos se analizaron mediante un an&aacute;lisis univariado de varianza (ANOVA) y an&aacute;lisis can&oacute;nico discriminante (ACD). Los quesos no cumplieron con las normas microbiol&oacute;gicas para BCF, <i>E.coli </i>y <i>Salmonella. </i>El ANOVA mostr&oacute; diferencias significativas (&#945; <u>&lt;</u> 0.05) entre las queser&iacute;as con respecto al n&uacute;mero de bacterias coliformes fecales. En cuanto al n&uacute;mero de BMA el (ANOVA), no mostr&oacute; diferencias significativas (&#945; = 0.05) entre los cinco tratamientos. El an&aacute;lisis can&oacute;nico discriminante (ACD), mostr&oacute; que los quesos crema tropical presentaron diferencias en sus caracter&iacute;sticas microbiol&oacute;gicas y fisicoqu&iacute;micas, en funci&oacute;n de las distintas fechas de muestreo.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>queso crema tropical, variables fisicoqu&iacute;micas y microbiol&oacute;gicas.</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">Tropical cream cheese samples were obtained from five cheese&#150;making enterprises randomly selected in Tonal&aacute;, Chiapas. With two modalities: cheeses made from pasteurized milk and cheeses made from raw milk. Samples were taken in January, February, March and April of 2007. The objectives of this research work were: to microbiologically evaluate the tropical cream cheese in finished product form, in function of the presence of mesophilic aerobic bacteria, pathogens such as <i>Salmonella sp. </i>and <i>E. coli; </i>and to determine the physiochemical characteristics of the tropical cream cheese and their influence on the development of <i>Salmonella sp. </i>and <i>E. coli. </i>Microbiological variables were number of fecal coliform bacteria (FCB), <i>E. coli, </i>number of mesophilic aerobic bacteria (MAB) and detection of <i>Salmonella sp. </i>The physiochemical variables were water activity (A<sub>w</sub>), pH, total acidity, protein, moisture, fat content, sodium chloride (NaCl), calcium and ashes %. The data were analyzed by univariate Analysis of Variance (ANOVA) and canonical discriminant analysis (CDA). The cheese did not meet microbiological standards for FCB, <i>E. coli </i>and <i>Salmonella. </i>The ANOVA showed significant differences (&#945; <u>&lt;</u> 0.05) among the cheeses with respect to the number of fecal coliform bacteria. The number of MAB, (ANOVA) showed no significant differences (&#945; = 0.05) among the five treatments. The canonical discriminate analysis (CDA) showed that the tropical cream cheeses presented differences in their physiochemical and microbiological characteristics, depending on the different sampling dates.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Keywords: </b>tropical cream cheese, physicochemical and microbiological variables.</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/v8n1/v8n1a11.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">AOAC, (1998). Association of Oficial Analytical Chemists. Official methods of analysis, <i>16<sup>th</sup> . (Ed.) 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