<?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>0864-0394</journal-id>
<journal-title><![CDATA[Pastos y Forrajes]]></journal-title>
<abbrev-journal-title><![CDATA[Pastos y Forrajes]]></abbrev-journal-title>
<issn>0864-0394</issn>
<publisher>
<publisher-name><![CDATA[Estación Experimental de Pastos y Forrajes Indio Hatuey]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03942019000300243</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización fitoquímica y actividad antioxidante total de diferentes extractos de Tithonia diversifolia (Hemsl) A. Gray]]></article-title>
<article-title xml:lang="en"><![CDATA[Pytochemical characterization and total antioxidant activity of different extracts from Tithonia diversifolia (Hemsl) A. Gray]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Sierra]]></surname>
<given-names><![CDATA[Liliet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Solares]]></surname>
<given-names><![CDATA[Maykelis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Cabrera]]></surname>
<given-names><![CDATA[Inelvis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonte-Carballo]]></surname>
<given-names><![CDATA[Leydi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lugo-Morales]]></surname>
<given-names><![CDATA[Yudit]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Altunaga-Pérez]]></surname>
<given-names><![CDATA[Nancy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Ministerio de Educación Superior Universidad de Matanzas Estación Experimental de Pastos y Forrajes Indio Hatuey]]></institution>
<addr-line><![CDATA[Matanzas ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>42</volume>
<numero>3</numero>
<fpage>243</fpage>
<lpage>248</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03942019000300243&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03942019000300243&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03942019000300243&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Con el objetivo de caracterizar, cualitativa y cuantitativamente, los principales metabolitos presentes en los extractos de hojas, tallos y raíces de Tithonia diversifolia (Hemsl) A. Gray y determinar la capacidad antioxidante total de las diferentes partes de la planta, se colectó al azar el material vegetal en la finca de un productor de la provincia de Matanzas, Cuba. Las muestras de hojas, tallos y raíces se secaron, pulverizaron y se extrajeron con etanol comercial mediante maceración. Posteriormente, el solvente se retiró mediante un rotoevaporador sobre vacío. Serealizó el tamizaje fitoquímico de los diferentes extractos para la determinación cualitativa de fenoles totales, flavonoides, saponinas, cumarina, taninos, quinonas y terpenoides. Se determinaron las concentraciones de fenoles totales, flavonoides y saponinas de los tres extractos con la utilización de un patrón ácido gálico, quercetina y panax ginseng 10 %, respectivamente. Se midió la actividad antioxidante total por el método del fosfomolibdato. La cuantificación se efectuó por triplicado en microplacas de 96 pocillos. Se utilizó en el análisis de los datos a través de estadística descriptiva con el paquete SPSS®, Versión 15. Los resultados mostraron presencia de fenoles, flavonoides, saponinas, cumarinas, quinonas y terpenoides en extractos etanólicos de raíces, tallos y hojas de T. diversifolia. La actividad antioxidante demostró que la raíz fue el órgano que tuvo mayor capacidad antioxidante, con 1,10 mg de ácido ascórbico/mg de extracto. Le siguieron las hojas (1,08) y por último, el tallo (0,50). La determinación cualitativa y cuantitativa de los metabolitos secundarios mostró la presencia de fenoles, flavonoides, cumarinas, quinonas y terpenoides en extractos etanólicos de las raíces, tallos y hojas de T. diversifolia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In order to characterize, qualitatively and quantitatively, the main metabolites present in leaf, stem and root extracts from Tithonia diversifolia (Hemsl) A. Gray and determine the total antioxidant capacity of the different plant parts, the plant material was randomly collected in a farm belonging to a farmer of Matanzas province, Cuba. The leaf, stem and root samples were dried, pulverized and extracted with commercial ethanol by maceration. Afterwards, the solvent was removed through a vacuum rotary evaporator. The phytochemical sieving of the different extracts was carried out for the qualitative determination of total phenols, flavonoids, saponins, coumarin, tannins, quinones and terpenoids. The concentrations of total phenols, flavonoids and saponins of the three extracts were determined using a gallic acid pattern, quercetin and 10 % panax ginseng, respectively. The total antioxidant activity was measured through the phosphomolybdate method. The quantification was carried out in triplicate in 96-well microplates. The data were analyzed through descriptive statistics with the package SPSS®, Version 15. The results showed presence of phenols, flavonoids, saponins, coumarins, quinones and terpenoids in ethanol extracts of T. diversifolia roots, stems and leaves. The antioxidant activity showed that the root was the organ with higher antioxidant capacity, with 1,10 mg of ascorbic acid/mg of extract. It was followed by the leaves (1,08) and finally, the stem (0,50). The qualitative and quantitative determination of secondary metabolites showed the presence of phenols, flavonoids, coumarins, quinones and terpenoids in ethanol extracts of T. diversifolia roots, stems and leaves.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hojas]]></kwd>
<kwd lng="es"><![CDATA[metabolitos]]></kwd>
<kwd lng="es"><![CDATA[raíces]]></kwd>
<kwd lng="es"><![CDATA[tallo]]></kwd>
<kwd lng="en"><![CDATA[leaves]]></kwd>
<kwd lng="en"><![CDATA[metabolites]]></kwd>
<kwd lng="en"><![CDATA[roots]]></kwd>
<kwd lng="en"><![CDATA[stem]]></kwd>
</kwd-group>
</article-meta>
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