<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2011000400011</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Linamarase Enzyme from Lactobacillus delbrueckii NRRL B-763: Purification and Some Properties of a &#946;-Glucosidase]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nwokoro]]></surname>
<given-names><![CDATA[Ogbonnaya]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anya]]></surname>
<given-names><![CDATA[Florence Onyebuchi]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Nigeria Department of Microbiology Industrial Microbiology and Biotechnology Laboratory]]></institution>
<addr-line><![CDATA[Nsukka ]]></addr-line>
<country>Nigeria</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>55</volume>
<numero>4</numero>
<fpage>246</fpage>
<lpage>250</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2011000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2011000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2011000400011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Some biochemical properties and purification of linamarase enzyme from Lactobacillus delbrueckii NRRL B-763 were studied. The crude enzyme was used to detoxify cassava flour cyanide and samples of 150 &#956;m particle size treated with the crude enzyme showed a reduction from 2.1 mg HCN/10g sample to 0.11 mg HCN/10 g sample after 20 h (95% reduction). Untreated control samples of 0.5 mm particle size showed a reduction from 2.1mg HCN/10 g sample to 1.98 mg HCN/10 g sample after 40 h (5.7% reduction). Lhe enzyme was purified 33 fold with a 40% yield through a series of four steps namely, ammonium sulphate precipitation, acetone precipitation, ion exchange chromatography and gel Alteration chromatograrphy using Sephadex G-200. Lhe purified enzyme showed maximum activity at pH 4.5. Lhe enzyme showed 100% stability at the pH range of 5.0 and 6.0. Maximum activity of the enzyme was observed at a temperature of 50 °C and maximum stability at a temperature range of 40 and 50 °C. Lhe approximate enzyme molecular weight was estimated to be 56 kDa by Sephadex G-200 gel filteration chromatography. Lhe linamarase enzyme could be adapted for improved degradation of cassava cyanide and other biotechnological applications.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se estudiaron algunas propiedades bioquímicas y la purificación de la enzima linamarasa obtenida de Lactobacillus delbrueckii NRRL B-763. La enzima cruda fue usada para eliminar los compuestos cianogénicos de harina de yuca. Muestras de 150 &#956;m en el tamaño de la partícula tratadas con la enzima cruda mostraron una reducción del 95%o en el contenido de estos compuestos tóxicos después de 20 horas de tratamiento. Las muestras sin tratar, testigo, de 0.5 mm de tamaño de partícula de sólo el 5.7% después de 40 horas. La enzima fue purificada 33 veces con un rendimiento del 40% a través de una serie de 4 pasos, precipitación con sulfato de amonio y con acetona, sucesivamente, cromatografía en columna de intercambio iónico y cromatografía de filtración en gel con Sephadex G-200. El pH óptimo de la enzima purificada fue de 4.5. La enzima es estable 100% en el rango de pH de 5.0 a 6.0. La actividad máxima de la enzima se observó a una temperature de 50 °C. La masa molecular aproximada de la enzima es de 56 kDa calculada a partir de su tiempo de elusión de una columna de permeasión en gel con Sephadex G-200. La enzima linamarasa podría ser adaptada para mejorar la degradación de los compuestos cianogénicos de la yuca, así como para otras aplicaciones biotecnológicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Linamarase enzyme]]></kwd>
<kwd lng="en"><![CDATA[cassava]]></kwd>
<kwd lng="en"><![CDATA[cyanide detoxification]]></kwd>
<kwd lng="en"><![CDATA[Lactobacillus delbrueckii]]></kwd>
<kwd lng="es"><![CDATA[detoxificación cianogénica]]></kwd>
<kwd lng="es"><![CDATA[enzima]]></kwd>
<kwd lng="es"><![CDATA[Lactobacillus delbrueckii]]></kwd>
<kwd lng="es"><![CDATA[linamarasa]]></kwd>
<kwd lng="es"><![CDATA[yuca]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Linamarase Enzyme from <i>Lactobacillus delbrueckii </i>NRRL B&#150;763: Purification and Some Properties of a &#946;&#150;Glucosidase</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Ogbonnaya Nwokoro* and Florence Onyebuchi Anya</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Industrial Microbiology and Biotechnology Laboratory, Department of Microbiology, University of Nigeria, Nsukka, Nigeria. +2348034402414, </i><a href="mailto:ogb883@yahoo.com">ogb883@yahoo.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received June 27, 2011.    <br> Accepted September 15, 2011.</font></p>     ]]></body>
<body><![CDATA[<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">Some biochemical properties and purification of linamarase enzyme from <i>Lactobacillus delbrueckii </i>NRRL B&#150;763 were studied. The crude enzyme was used to detoxify cassava flour cyanide and samples of 150 &#956;m particle size treated with the crude enzyme showed a reduction from 2.1 mg HCN/10g sample to 0.11 mg HCN/10 g sample after 20 h (95% reduction). Untreated control samples of 0.5 mm particle size showed a reduction from 2.1mg HCN/10 g sample to 1.98 mg HCN/10 g sample after 40 h (5.7% reduction). Lhe enzyme was purified 33 fold with a 40% yield through a series of four steps namely, ammonium sulphate precipitation, acetone precipitation, ion exchange chromatography and gel Alteration chromatograrphy using Sephadex G&#150;200. Lhe purified enzyme showed maximum activity at pH 4.5. Lhe enzyme showed 100% stability at the pH range of 5.0 and 6.0. Maximum activity of the enzyme was observed at a temperature of 50 &deg;C and maximum stability at a temperature range of 40 and 50 &deg;C. Lhe approximate enzyme molecular weight was estimated to be 56 kDa by Sephadex G&#150;200 gel filteration chromatography. Lhe linamarase enzyme could be adapted for improved degradation of cassava cyanide and other biotechnological applications. </font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Linamarase enzyme, cassava; cyanide detoxification; <i>Lactobacillus delbrueckii.</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">Se estudiaron algunas propiedades bioqu&#237;micas y la purificaci&#243;n de la enzima linamarasa obtenida de <i>Lactobacillus delbrueckii </i>NRRL B&#150;763. La enzima cruda fue usada para eliminar los compuestos cianog&#233;nicos de harina de yuca. Muestras de 150 &#956;m en el tama&#241;o de la part&#237;cula tratadas con la enzima cruda mostraron una reducci&#243;n del 95%o en el contenido de estos compuestos t&#243;xicos despu&#233;s de 20 horas de tratamiento. Las muestras sin tratar, testigo, de 0.5 mm de tama&#241;o de part&#237;cula de s&#243;lo el 5.7% despu&#233;s de 40 horas. La enzima fue purificada 33 veces con un rendimiento del 40% a trav&#233;s de una serie de 4 pasos, precipitaci&#243;n con sulfato de amonio y con acetona, sucesivamente, cromatograf&#237;a en columna de intercambio i&#243;nico y cromatograf&#237;a de filtraci&#243;n en gel con Sephadex G&#150;200. El pH &#243;ptimo de la enzima purificada fue de 4.5. La enzima es estable 100% en el rango de pH de 5.0 a 6.0. La actividad m&#225;xima de la enzima se observ&#243; a una temperature de 50 &deg;C. La masa molecular aproximada de la enzima es de 56 kDa calculada a partir de su tiempo de elusi&#243;n de una columna de permeasi&#243;n en gel con Sephadex G&#150;200. La enzima linamarasa podr&#237;a ser adaptada para mejorar la degradaci&#243;n de los compuestos cianog&#233;nicos de la yuca, as&#237; como para otras aplicaciones biotecnol&#243;gicas. </font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>detoxificaci&#243;n cianog&#233;nica, enzima, <i>Lactobacillus delbrueckii, </i>linamarasa, yuca.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v55n4/v55n4a11.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     ]]></body>
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