<?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>S0034-74182022000200703</article-id>
<article-id pub-id-type="doi">10.15446/rcciquifa.v51n2.98620</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparative study of antioxidant properties of the extracts of Polygonum acre H.B.K.]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio comparativo de las propiedades antioxidantes de los extractos de Polygonum acre H.B.K.]]></article-title>
<article-title xml:lang="pt"><![CDATA[Estudo comparativo das propriedades antioxidantes de extratos de Polygonum acre H.B.K.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Seyfried]]></surname>
<given-names><![CDATA[Melina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campestrini]]></surname>
<given-names><![CDATA[Luciano Henrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zawadzki-Baggio]]></surname>
<given-names><![CDATA[Selma Faria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molento]]></surname>
<given-names><![CDATA[Marcelo Beltrão]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baron Maurer]]></surname>
<given-names><![CDATA[Juliana Bello]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Federal University of Paraná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,National Institute for Amazonian Research (INPA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>51</volume>
<numero>2</numero>
<fpage>703</fpage>
<lpage>722</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74182022000200703&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74182022000200703&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74182022000200703&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY  Aims: This study aimed to characterize and compare the antioxidative potential of extracts obtained by infusion, decoction, tincture, aqueous extraction, and hydro-ethanolic maceration from the aerial parts of Polygonum acre H.B.K., which has been traditionally used in herbal preparations, for different purposes. The therapeutic benefits are attributed to phenolic compounds and their antioxidant properties.  Methods: All extracts were characterized considering their quantitative content of the total phenolics, flavonoids, condensed and, hydrolysable tannins, by colori-metric methods. EHW-PA was selected for HPLC analysis as it showed a higher yield (10.58 % w/m) and a phenolic content &gt; 200 mg GAE/g dry extract. The phenolic profile showed a chromatogram with 20 peaks, and the presence of gallic acid, rutin, and quercetin was verified by comparison with the retention times of standard compounds. The antioxidant activities were determined by ABTS capture test, ferric reducing antioxidant power test (FRAP), and the superoxide anion scavenging test.  Results: Tinctures showed a higher average content of phenolic compounds, present mainly as flavonoid content. A significant correlation coefficient was observed between the total phenolic content and its antioxidant activity, determining by ABTS and FRAP assays. Differently, a low to moderate correlation between the flavonoid content and antioxidant activity was verified.  Conclusion: This study reinforces the ethnopharmacological relevance of the Polygonum genus and could contribute to the scientific basis for the use of P. acre preparations.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivos: Este estudio tuvo como objetivo caracterizar y comparar el potencial antioxidante de extractos obtenidos por infusión, decocción, tintura, extracción acuosa e hidroetanólica de las partes aéreas de Polygonum acre H.B.K., que se ha utilizado tradicionalmente en preparaciones a base de hierbas, para diferentes fines. Los beneficios terapéuticos se atribuyen a los compuestos fenólicos y sus propiedades antioxidantes.  Métodos: Todos los extractos se caracterizaron considerando su contenido cuantitativo de fenólicos totales, flavonoides, taninos condensados e hidrolizables, por métodos colorimétricos. Se seleccionó EHW-PA para el análisis de HPLC ya que mostró un rendimiento más alto (10,58% m/m) y un contenido fenólico &gt; 200 mg GAE/g de extracto seco. El perfil fenólico mostró un cromatograma con 20 picos y se verificó la presencia de ácido gálico, rutina y quercetina por comparación con los tiempos de retención de los compuestos estándar. Las actividades antioxidantes se determinaron mediante la prueba de captura ABTS, la prueba del poder antioxidante reductor férrico (FRAP) y la prueba de eliminación del anión superóxido.  Resultados: Las tinturas mostraron un mayor contenido promedio de compuestos fenólicos, presentes principalmente como contenido de flavonoides. Se observó un coeficiente de correlación significativo entre el contenido fenólico total y su actividad antioxidante, determinado por ensayos ABTS y FRAP. De manera diferente, se verificó una correlación de baja a moderada entre el contenido de flavonoides y la actividad antioxidante.  Conclusión: Este estudio refuerza la relevancia etnofarma-cológica del género Polygonum y podría contribuir a la base científica para el uso de preparaciones de P. acre.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO  Objetivos: O presente estudo teve como objetivo caracterizar e comparar o potencial antioxidante de extratos obtidos por infusão, decocção, tintura, extração aquosa e maceração hidroetanólica da parte aérea de Polygonum acre H.B.K., tradicional- mente utilizado em preparações fitoterápicas, para diversos fins. Os benefícios terapêuticos são atribuídos aos compostos fenólicos e suas propriedades antioxidantes.  Métodos: Todos os extratos foram caracterizados quanto ao teor quantitativo de fenólicos totais, flavonoides, taninos condensados e hidrolisáveis, por métodos colorimétricos. O EHW-PA foi selecionado para análise por HPLC por apresentar maior rendimento (10,58% m/v) e conteúdo fenólico &gt; 200 mg GAE/g de extrato seco. O perfil fenólico apresentou cromatograma com 20 picos, e a presença de ácido gálico, rutina e quercetina foi verificada pela comparação com os tempos de retenção dos compostos padrão. As atividades antioxidantes foram determinadas pelo teste de captura do radical ABTS, ensaio do potencial antioxidante por redução férrica (FRAP) e teste de desativação do ânion superóxido.  Resultados: As tinturas apresentaram maior teor médio de compostos fenólicos, presentes, principalmente, na forma de flavonoides. Foi observado um coeficiente de correlação significativo entre o conteúdo fenólico total e sua atividade antioxidante, determinado pelos ensaios de ABTS e FRAP. Diferentemente, verificou-se uma correlação baixa a moderada entre o conteúdo de flavonoides e a atividade antioxidante.  Conclusão: Este estudo reforça a relevância etnofarmacológica do gênero Polygonum e pode contribuir para a fundamentação científica do uso de preparações de P. acre.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ABTS]]></kwd>
<kwd lng="en"><![CDATA[Dotted Smartweed]]></kwd>
<kwd lng="en"><![CDATA[flavonoids]]></kwd>
<kwd lng="en"><![CDATA[FRAP]]></kwd>
<kwd lng="en"><![CDATA[water-pepper]]></kwd>
<kwd lng="es"><![CDATA[ABTS]]></kwd>
<kwd lng="es"><![CDATA[chilillo]]></kwd>
<kwd lng="es"><![CDATA[catay dulce,,flavonoides]]></kwd>
<kwd lng="es"><![CDATA[FRAP]]></kwd>
<kwd lng="pt"><![CDATA[ABTS]]></kwd>
<kwd lng="pt"><![CDATA[erva de bicho]]></kwd>
<kwd lng="pt"><![CDATA[flavonoides]]></kwd>
<kwd lng="pt"><![CDATA[FRAP]]></kwd>
<kwd lng="pt"><![CDATA[pimenta d'água]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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