<?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>0123-3033</journal-id>
<journal-title><![CDATA[Ingeniería y competitividad]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. compet.]]></abbrev-journal-title>
<issn>0123-3033</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad del Valle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-30332024000100008</article-id>
<article-id pub-id-type="doi">10.25100/iyc.v26i1.13275</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Extraction and application of tannins from mango seed (Manpngera indica) as tanning agent for Santa Inés Sheepskin (Ovis aries)]]></article-title>
<article-title xml:lang="es"><![CDATA[Extracción y aplicación de taninos de la almendra de mango (Manpngera indica) como curtiente para la piel ovina Santa Inés (Ovis aries)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz-Díaz]]></surname>
<given-names><![CDATA[Hector Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palencia-Blanco]]></surname>
<given-names><![CDATA[Cristian Giovanny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pacheco-Valderrama]]></surname>
<given-names><![CDATA[Mónica María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rico-Suárez]]></surname>
<given-names><![CDATA[Fabián Aristóbulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Universitario de la Paz  ]]></institution>
<addr-line><![CDATA[Barrancabermeja ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Universitario de la Paz  ]]></institution>
<addr-line><![CDATA[Barrancabermeja ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-30332024000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-30332024000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-30332024000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This research focused on the tanning of sheepskins (Ovis aries) using tannins extracted from mango kernels (Manpngera indica) to assess the potential of this byproduct. Tannin extractions were conducted using ethanol-water solutions at concentrations of 70%-30% and 50%-50%. Quantification was performed via the Folin-Ciocalteu method using gallic acid as a standard. The tanning ability on sheepskin was evaluated through the leather's physical properties. The highest concentration of gallic acid equivalents (GAE) was obtained from the ethanol-water extraction at 50%-50%, with an average concentration of 110,1 mg GAE/g. Subsequently, the tanning process was applied to sheepskin, and the physical-mechanical properties of the leather were determined. Tensile strength values obtained were 12,7 MPa for the 50%-50% ethanol-water concentration and 11,3 MPa for the 70%-30% ratio. Elongation percentages were 11,7 N and 17,7 N, tear resistance values were 41,9 N and 58,0 N, shrinkage temperatures were 61°C and 60°C, distension measurements were 13,2 mm and 10,6 mm, and breakage forces were 37,4 daN and 48,3 daN respectively. Ultimately, the tanned leathers with tannins met 5 out of 6 analyzed tests according to UNE-EN ISO standards. Hence, the tannin extract from mango kernels demonstrates potential as a substitute for chromium salts, thereby favoring both environmental sustainability and the production of quality leather from sheepskin.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este proyecto se enfocó en la curtición de pieles ovinas (Ovis aries) a partir de los taninos obtenidos de la almendra de mango (Manpngera indica), para evaluar el potencial de este subproducto mediante el aprovechamiento del mismo. Para ello, se realizaron extracciones de taninos con soluciones acuosas de etanol-agua en concentraciones de 70%-30% y 50%-50% y se cuantificaron mediante el método Folin Ciocalteu utilizando ácido gálico como patrón. Se evaluó la capacidad de curtido en la piel ovina mediante las propiedades físicas del cuero. Se obtuvo que la mayor concentración de equivalentes de ácido gálico (GAE) fue para la extracción con etanol-agua al 50%-50% con una concentración promedio de 1,14 mg GAE/g. A partir de esto, se realizó el proceso de curtido a la piel de ovino donde se determinaron las propiedades fisicomecánicas del cuero como resistencia a la tracción con valores obtenidos de 12.7 MPa para la concentración de Etanol-Agua al 50%-50% y 11,3 MPa para la concentración de la relación 70%- 30%; porcentaje de elongación con valores de 11,7 N y 17,7 N; resistencia al desgarre con valores de 41,9 N y 58,0 N; temperatura de contracción 61°C y 60°C; distensión de 13,22 mm y 10,68 mm y rotura de 37,47 daN y 48,39 daN respectivamente. Finalmente, los cueros curtidos con taninos cumplieron con 5 de las 6 pruebas analizadas según las normas UNE-EN ISO, por lo que el extracto de taninos de la almendra de mango se muestra como potencial sustituto a las sales de cromo llegando a contribuir a una industria más amigable con el medio ambiente y a obtener cueros de calidad a partir de la piel ovina.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Distension]]></kwd>
<kwd lng="en"><![CDATA[Elongation percentage]]></kwd>
<kwd lng="en"><![CDATA[Galic acid]]></kwd>
<kwd lng="en"><![CDATA[Tear resistance]]></kwd>
<kwd lng="en"><![CDATA[Shrinkage temperature]]></kwd>
<kwd lng="es"><![CDATA[Ácido gálico]]></kwd>
<kwd lng="es"><![CDATA[Distensión]]></kwd>
<kwd lng="es"><![CDATA[Porcentaje de elongación]]></kwd>
<kwd lng="es"><![CDATA[Resistencia al desgarre]]></kwd>
<kwd lng="es"><![CDATA[Temperatura de contracción]]></kwd>
</kwd-group>
</article-meta>
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