<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952018000500757</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Inhibición de la oxidación de lípidos y constituyentes fenólicos relacionados en la madera y la corteza de tres especies de encino (Quercus candicans, Q. laurina y Q. rugosa)]]></article-title>
<article-title xml:lang="en"><![CDATA[Inhibition of lipid oxidation and related phenolic constituents in the wood and bark of three oak species (Quercus candicans, Q. laurina, and Q. rugosa)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Argueta-Solís]]></surname>
<given-names><![CDATA[María G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[Cristóbal N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pintor-Ibarra]]></surname>
<given-names><![CDATA[Luis F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-González]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Molina]]></surname>
<given-names><![CDATA[Romeo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wong-Paz]]></surname>
<given-names><![CDATA[Jorge E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedraza-Bucio]]></surname>
<given-names><![CDATA[Fabiola E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rutiaga-Quiñones]]></surname>
<given-names><![CDATA[José G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Ingeniería en Tecnología de la Madera ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Coahuila Facultad de Ciencias Químicas Departamento de Investigación en Alimentos]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>5</numero>
<fpage>757</fpage>
<lpage>766</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000500757&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000500757&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000500757&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La búsqueda de fenoles con capacidad antioxidante presentes en diferentes plantas, frutos y otras estructuras para combatir enfermedades que ocasionan los radicales libres va en aumento. Estas sustancias también se han detectado en maderas de coníferas y en algunas especies de encinos, pero hay pocos estudios con maderas de este género y que puedan ser fuente de estos fenoles. Por ello, el objetivo de este estudio fue determinar la capacidad antioxidante y el perfil fenólico de extractos metanólicos y acuosos en albura, duramen y corteza de tres encinos (Quercus candicans, Q. laurina y Q. rugosa). Los extractos se obtuvieron por extracción sucesiva con disolventes de polaridad creciente (ciclohexano, acetona, metanol) en equipo Soxhlet y al final con reflujo de agua caliente. La actividad antioxidante se analizó mediante la inhibición de la oxidación de lípidos y la composición fenólica de los extractos por análisis HPLC. Los rendimientos mayores se obtuvieron en los extractos totales con metanol de las cortezas. La inhibición de la oxidación de lípidos fue mayor con el extracto metanólico de la albura de Q. rugosa (94.09 % de actividad antioxidante), en contraste el extracto metanólico de la albura de Q. laurina fue el menor (42.54 %). Los compuestos fenólicos más frecuentes en los extractos de los tres encinos fueron el ácido clorogénico, resorcinol, catequina y ácido gálico. Los extractos metanólicos y acuosos de madera y corteza de los tres encinos son ricos en compuestos fenólicos con actividad antioxidante potente y son una alternativa como fuente de biomoléculas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract An increasing number of researches have focused on phenols with antioxidant capacities that can fight diseases caused by free radicals. Those phenols can be found in various plants, fruits, and other structures. These substances were also detected in the wood of conifers and some oak species. However, there are few studies about this kind of wood, even though they could be a source of these phenols. Therefore, the objective of this study was to determine the antioxidant capacity and the phenolic profile of the methanolic and aqueous extracts from the sapwood, heartwood, and bark of three oaks (Quercus candicans, Q. laurina, and Q. rugosa). The extracts were obtained by successive extraction with solvents of increasing polarity (cyclohexane, acetone, and methanol) in a Soxhlet equipment, and they were finally subject to hot water with reflux. The antioxidant activity was analyzed through the inhibition of the lipid oxidation, while the phenolic composition of the extracts was analyzed through a HPLC analysis. Higher outputs were obtained from the total extracts with methanol taken from bark. The inhibition of the lipid oxidation was higher when the methanolic extract was taken from the sapwood of Q. rugosa (antioxidant activity: 94.09 %), while the methanolic extract taken from the sapwood of Q. laurina was lower (42.54 %). The phenolic compounds most frequently found in the extracts taken from the three oaks were chlorogenic acid, resorcinol, catechin, and gallic acid. Methanolic and aqueous extracts taken from the wood and bark of three oaks are rich in phenolic compounds with potent antioxidant activity and they are an alternative source of biomolecules.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[extraíbles]]></kwd>
<kwd lng="es"><![CDATA[albura]]></kwd>
<kwd lng="es"><![CDATA[duramen]]></kwd>
<kwd lng="es"><![CDATA[Quercus spp.]]></kwd>
<kwd lng="es"><![CDATA[actividad antioxidante]]></kwd>
<kwd lng="es"><![CDATA[fenoles]]></kwd>
<kwd lng="en"><![CDATA[extractives]]></kwd>
<kwd lng="en"><![CDATA[sapwood]]></kwd>
<kwd lng="en"><![CDATA[heartwood]]></kwd>
<kwd lng="en"><![CDATA[Quercus spp.]]></kwd>
<kwd lng="en"><![CDATA[antioxidant activity]]></kwd>
<kwd lng="en"><![CDATA[phenols]]></kwd>
</kwd-group>
</article-meta>
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