<?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>1405-0471</journal-id>
<journal-title><![CDATA[Madera y bosques]]></journal-title>
<abbrev-journal-title><![CDATA[Madera bosques]]></abbrev-journal-title>
<issn>1405-0471</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-04712006000100037</article-id>
<article-id pub-id-type="doi">10.21829/myb.2006.1211249</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Propiedades antirradicales libres y antibacterianas de extractos de corteza de pino]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales Castro]]></surname>
<given-names><![CDATA[Martha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez López]]></surname>
<given-names><![CDATA[María Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce Rodríguez]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,IPN CIIDIR ]]></institution>
<addr-line><![CDATA[Unidad Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>37</fpage>
<lpage>49</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-04712006000100037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-04712006000100037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-04712006000100037&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se evaluó la actividad de captura de radicales libres de extractos etanólicos y acuosos de la corteza de Pinus ayacahuite, Pinus cooperi, Pinus durangensis, Pinus leiophylla y Pinus teocote, utilizando el método del radical difenilpicrilhidracilo (DPPH), a concentraciones de extracto de (250, 500, 750, 1000 y 1250) mg L-1. La actividad se comparó con la de los antioxidantes comerciales butilhydroxitolueno (BHT) y butilhydroxianisol (BHA). Los extractos etanólicos presentaron mayor actividad que los acuosos, sobresaliendo las especies P. leiophylla y P. durangensis, con capacidades antirradicales a 500 mg L-1 de (90,4 ± 0,98) % y (83,0 ± a 41) %, similares a BHA (83,6 ± 0,20) % y superiores a BHT (50,3 ± 0,72). A excepción de P. cooperi, todos los extractos, tanto etanólicos como acuosos presentaron actividad superior al 90,0 % a 1250 mg L-1. Se calculó la concentración para inhibir el 50,0 % de los radicales (CE50). La actividad antibacteriana se evaluó por el método de dilución en agar, sobre Staphylococcus aureus, Enterococcus sp., Escherichia coli y Pseudomonas aeruginosa a concentraciones de (0,625, 2,5, 5,0, 10,0 y 20,0) mg/mL. Se reportó como la concentración mínima inhibitoria (CMI) para impedir el crecimiento bacteriano. En general los extractos etanólicos mostraron mayor inhibición que los acuosos, S. aureus se inhibió eficientemente (CMI 0,625 mg/mL), Enterococcus sp., moderadamente (CMI 2,5 mg/mL), E. coli no tuvo buena inhibición (CMI 10,0 a 20,0) mg/mL y P. aeruginosa solo se inhibió eficientemente por el extracto etanólico de P. cooperi (2,5 mg/mL).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Free radicals scavengers of ethanolic and aqueous extracts from Pinus ayacahuite, Pinus cooperi, Pinus durangensis, Pinus leiophylla and Pinus teocote bark were evaluated, using the diphenylpicrylhydrazyl (DPPH) radical assay, to extract concentrations of (250, 500, 750, 1000 and 1250) mg L-1. The scavengers were compared with butilhydroxitolueno (BHT) and butilhydroxianisol (BHA). Ethanolic extracts had higher activity than the aqueous one, specially P. leiophylla and P. durangensis, with scavengers at 500 mg L-1 of (90,4 ± 0,98) % and (83,0 ± 1,41) %, similar to BHA (83,6 ± 0,20) % and higher than BHT (50,3 ± 0,72) %. Other than P. cooperi all extracts showed scavengers higher to 90,0 % at 1250 mg L-1. The concentration for scavengers 50,0 % of radical (CE50) was evaluated. The antimicrobial activity of the extracts was evaluated using agar dilution method against Staphylococcus aureus, Enterococcus sp., Escherichia coli and Pseudomonas aeruginosa to concentrations of (0,625, 2,5, 5,0, 10,0 and 20,0) mg/mL. The minimal inhibitory concentration (MIC) was reported. Ethanolic extracts had higher activity than the aqueous one. S. aureus was the most inhibited (MIC 0,625 mg/mL), Enterococcus sp. moderaty inhibited (MIC 2,5 mg/mL), E. coli do not had a good inhibition (MIC 10,0 to 20,0) mg/mL. P. aeruginosa only was efficiently inhibited by P. cooperi (2,5 mg/mL) ethanolic extract.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Actividad antibacteriana]]></kwd>
<kwd lng="es"><![CDATA[corteza de pino]]></kwd>
<kwd lng="es"><![CDATA[DPPH]]></kwd>
<kwd lng="es"><![CDATA[extractos]]></kwd>
<kwd lng="en"><![CDATA[Antibacterian activity]]></kwd>
<kwd lng="en"><![CDATA[Pinus bark]]></kwd>
<kwd lng="en"><![CDATA[DPPH]]></kwd>
<kwd lng="en"><![CDATA[extracts]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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