<?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>0034-7418</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Químico - Farmacéuticas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. cienc. quim. farm.]]></abbrev-journal-title>
<issn>0034-7418</issn>
<publisher>
<publisher-name><![CDATA[Departamento de Farmácia, Facultad de Ciencias, Universidade Nacional da Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74182021000100236</article-id>
<article-id pub-id-type="doi">10.15446/rcciquifa.v50n1.95457</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actividad antioxidante de cuatros especies vegetales del nordeste argentino]]></article-title>
<article-title xml:lang="en"><![CDATA[Antioxidant activity of four plant species in the Argentine Northeast]]></article-title>
<article-title xml:lang="pt"><![CDATA[Atividade antioxidante de quatro espécies de plantas no Nordeste argentino]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soro]]></surname>
<given-names><![CDATA[Ariadna Soledad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[Gabriela Malena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez]]></surname>
<given-names><![CDATA[María Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional del Chaco Austral  ]]></institution>
<addr-line><![CDATA[Chaco ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>236</fpage>
<lpage>252</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74182021000100236&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74182021000100236&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74182021000100236&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivos: Determinar la composición fitoquímica y evaluar la actividad antioxidante de los extractos hidroalcohólicos de S. haematospermum; P. niruri; P. tenellus; E. serpens.  Metodología: La composición fitoquímica se analizó por cromatografía en capa fina y la actividad antioxidante se observó de modo cualitativo por ensayo autográfico. Los fenoles totales se cuantificaron con el método de Folin-Ciocalteu y flavonoides totales con la reacción de complejación de aluminio. Para determinar la actividad antioxidante se utilizaron las técnicas de decoloración del radical libre DPPH&#8226; (2,2- difenil-1-picrilhidracilo) y del radical catión ABTS&#8226;+ (ácido 2,2'-azino-bis (3-etilbenzotiazolin)-6-sulfónico) y del poder reductor del catión hierro (III).  Resultados: El estudio fitoquímico evidenció en todas las especies la presencia de metabolitos bioactivos. El contenido de fenoles totales osciló entre: 627,71 ± 1,45 y 369,8±52,6 mg EAG/g muestra y de flavonoides totales fue de 12,2 ± 0,1 hasta 4,5 ± 0,3 mg Q/g muestra. Las especies S. haematospermum y P. tenellus presentaron mayor contenido de polifenoles. Los ensayos de actividad antioxidante permitieron reconocer que S. haematospermum y P. tenellus tienen capacidad de mayor inhibición de los radicales libres probados y mostraron mayor poder reductor los extractos hidroalcohólicos S. haematospermum y P. niruri.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY  Objectives: To determine the phytochemical composition and evaluate the anti-oxidant activity of the hydroalcoholic extracts of S. haematospermum; P. niruri; P. tenellus; E. serpens.  Methodology: The phytochemical composition was analyzed by thin layer chromatography and the antioxidant activity was observed qualitatively by autographic assay. Total phenols were quantified with the Folin-Ciocalteu method and total flavonoids with the aluminum complexation reaction. To determine the antioxidant activity, the discoloration techniques of the free radical DPPH&#8226; (2,2-diphenyl-1-picrilhydracil) and of the cation radical ABTS&#8226;+ (2,2-Azino-bis-3-ethylbenzothiazolin-6-sulfonic acid) and the reducing power of the iron (III) cation.  Results: The phytochemical study showed the presence of bioactive metabolites in all species. The total phenol content ranged from: 627.71 ± 1.45 to 369.8 ± 52.6 mg EAG / g sample and total flavonoids was 12.2 ± 0.1 to 4.5 ± 0.3 mg Q / g sample. The species S. haematospermum and P. tenellus presented higher content of polyphenols. The antioxidant activity tests allowed recognizing that S. haematospermum and P. tenellus have a capacity for greater inhibition of the tested free radicals and the hydroalcoholic extracts S. haematospermum and P. niruri showed greater reducing power.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO  Objetivos: Determinar a composição fitoquímica e avaliar a atividade antioxidante dos extratos hidroalcoólicos de S. haematospermum; P. niruri; P. tenellus; E. serpens.  Metodologia: A composição fitoquímica foi analisada por cromatografía em camada delgada e a atividade antioxidante foi observada qualitativamente por ensaio autográ-fico. Fenóis totais foram quantificados pelo método de Folin-Ciocalteu e flavonóides totais pela reação de complexação de alumínio. Para determinar a atividade antioxidante, as técnicas de descoloração do radical livre DPPH&#8226; (2,2-difenil-1-picrilhidracil) e do radical catiônico ABTS&#8226;+ (2,2-azino-bis-3-etilbenzotiazolin-6-sulfônico ácido) e o poder redutor do cátion ferro (III).  Resultados: O estudo fitoquímico mostrou a presença de metabólitos bioativos em todas as espécies. O conteúdo total de fenol variou de: 627,71 ± 1,45 a 369,8 ± 52,6 mg EAG / g amostra e flavonóides totais foi de 12,2 ± 0,1 a 4,5 ± 0,3 mg Q / g amostra. As espécies S. haematospermum e P. tenellus apresentaram maior teor de polifenóis. Os testes de atividade antioxidante permitiram reconhecer que S. haematospermum e P. tenellus apresentam maior capacidade de inibição dos radicais livres testados e os extratos hidroalcoólicos S. haematospermum e P. niruri apresentaram maior poder redutor.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Radicales libres]]></kwd>
<kwd lng="es"><![CDATA[polifenoles]]></kwd>
<kwd lng="es"><![CDATA[Euphorbiaceae]]></kwd>
<kwd lng="es"><![CDATA[Phyllanthaceae]]></kwd>
<kwd lng="en"><![CDATA[Free radicals]]></kwd>
<kwd lng="en"><![CDATA[polyphenols]]></kwd>
<kwd lng="en"><![CDATA[Euphorbiaceae]]></kwd>
<kwd lng="en"><![CDATA[Phyllanthaceae]]></kwd>
<kwd lng="pt"><![CDATA[Radicais livres]]></kwd>
<kwd lng="pt"><![CDATA[polifenóis]]></kwd>
<kwd lng="pt"><![CDATA[Euphorbiaceae]]></kwd>
<kwd lng="pt"><![CDATA[Phyllanthaceae]]></kwd>
</kwd-group>
</article-meta>
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