<?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>1692-3561</journal-id>
<journal-title><![CDATA[Biotecnología en el Sector Agropecuario y Agroindustrial]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Bio.Agro]]></abbrev-journal-title>
<issn>1692-3561</issn>
<publisher>
<publisher-name><![CDATA[Taller Editorial Universidad del Cauca]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1692-35612020000200082</article-id>
<article-id pub-id-type="doi">10.18684/bsaa(18)82-93</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actividad antioxidante e influencia del periodo climático sobre el contenido de polifenoles totales en Merremia aegyptia]]></article-title>
<article-title xml:lang="en"><![CDATA[Antioxidant activity and seasonal influence on total polyphenols content in Merremia aegyptia]]></article-title>
<article-title xml:lang="pt"><![CDATA[Atividade antioxidante e influência do período climático sobre o conteúdo de polifenóis totais em Merremia aegyptia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SALGADO-CHÁVEZ]]></surname>
<given-names><![CDATA[JOSÉ ALBERTO]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PALACIO-VALENCIA]]></surname>
<given-names><![CDATA[ANDERSON ENRIQUE]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[VALERO-VALERO]]></surname>
<given-names><![CDATA[NELSON OSVALDO]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Guajira Facultad de Ciencias Básicas y Aplicadas Grupo de Investigación Biotecnología]]></institution>
<addr-line><![CDATA[Riohacha ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de La Guajira Programa de Biología Grupo de Investigación Biotecnología]]></institution>
<addr-line><![CDATA[Riohacha ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de La Guajira Facultad de Ciencias Básicas y Aplicadas Grupo de Investigación DESTACAR]]></institution>
<addr-line><![CDATA[Riohacha ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>82</fpage>
<lpage>93</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1692-35612020000200082&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1692-35612020000200082&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1692-35612020000200082&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Merremia aegyptia (Convolvulaceae) no se ve afectada por la aridez que presenta la mayor parte del territorio guajiro (La Guajira, Colombia). Sin embargo, ha sido subestimada y considerada arvense al desconocerse sus propiedades medicinales y otros posibles usos. Así, con la presente investigación se pretendió establecer la influencia de los periodos climáticos y la fenología sobre la producción de polifenoles en dicha especie y estimar el potencial antioxidante de sus extractos. Se tomaron muestras de tejido foliar durante un año y se sometieron a extracción con metanol, la concentración de polifenoles totales fue establecida mediante el método de Folin-Ciacolteau y se correlacionó con la precipitación y temperatura mensual. Además, se estimó el porcentaje de inhibición de los extractos sobre el radical DPPH. Los resultados obtenidos indicaron variación en la concentración mensual de polifenoles totales, siendo enero de 2018 el mes donde se registró la mayor concentración (6,03%). Adicionalmente, los extractos presentaron mayor actividad antioxidante (85,15%) que el ácido ascórbico (38,65%). Se concluyó que la disponibilidad de agua en el suelo afecta la producción de polifenoles en M. aegyptia y que esta especie representa un recurso vegetal susceptible de ser cultivado y explotado bajo las condiciones ambientales de La Guajira.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Merremia aegyptia (Convolvulaceae) is not affected by the predominant aridity in most of guajiro territory (La Guajira, Colombia). However, this species has been underestimated and considered weed since its medicinal properties and other possible uses are unknown. Thus, the present investigation was tried to establish the influence of seasons and the phenology on the production of polyphenols in M. aegyptia and to estimate the antioxidant potential of its extracts. Foliar tissue samples were taken for one year and subjected to methanol extraction, total polyphenol concentration was established by Folin-Ciacolteau method and correlated with monthly precipitation and temperature. In addition the percentage of inhibition of its leaf extracts on the DPPH radical was estimated. Results suggest variation in monthly concentration of total polyphenols, obtaining the highest concentration in January 2018 (6,03%). Furthermore, the extracts have a higher antioxidant activity (85,15%) than ascorbic acid (38,65%). It was concluded that the availability of water in soil affects the production of polyphenols in M. aegyptia and that this species represents a plant resource capable of being cultivated and exploited under the environmental conditions of La Guajira.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO Merremia aegyptia (Convolvulaceae) não é afetada pela aridez da maior parte do território guajiro (La Guajira, Colômbia). Porém tem sido subestimada e considerada como erva daninha pelo que nao são conhecidas suas propriedades medicinais e outros usos possíveis. Nesse sentido, a presente investigação procurou-se estabelecer a influência dos períodos climáticos e a fenologia na produção de polifenóis nessa espécie e estimar o potencial antioxidante de seus extratos. Amostras do tecido foliar foram colhidas por um ano e submetidas à extração de metanol e, a concentração de polifenóis totais foi estabelecida pelo método de Folin-Ciacolteau e correlacionada com precipitação e temperatura mensais, além da porcentagem de inibição da extratos sobre o radical DPPH. Os resultados obtidos indicaram variação na concentração mensal de polifenóis totais, sendo janeiro de 2018 o mês em que a maior concentração foi registrada (6,03%); além disso, os extratos apresentaram maior atividade antioxidante (85,15%) que o ácido ascórbico (38,65%). Concluiu-se que a disponibilidade de água no solo afeta a produção de polifenóis em M. aegyptia e que essa espécie representa um recurso vegetal capaz de ser cultivado e explorado nas condições ambientais do estado La Guajira.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bioprospección]]></kwd>
<kwd lng="es"><![CDATA[Metabolitos secundarios]]></kwd>
<kwd lng="es"><![CDATA[Convolvulaceae]]></kwd>
<kwd lng="es"><![CDATA[Precipitación pluvial]]></kwd>
<kwd lng="es"><![CDATA[Fenología.]]></kwd>
<kwd lng="en"><![CDATA[Bioprospection]]></kwd>
<kwd lng="en"><![CDATA[Secundary metabolites]]></kwd>
<kwd lng="en"><![CDATA[Convolvulaceae]]></kwd>
<kwd lng="en"><![CDATA[Rain]]></kwd>
<kwd lng="en"><![CDATA[Phenology.]]></kwd>
<kwd lng="pt"><![CDATA[Bioprospecção]]></kwd>
<kwd lng="pt"><![CDATA[Metabolitos secundários]]></kwd>
<kwd lng="pt"><![CDATA[Convolvulaceae]]></kwd>
<kwd lng="pt"><![CDATA[Chuvas]]></kwd>
<kwd lng="pt"><![CDATA[Fenologia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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