<?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>0864-0300</journal-id>
<journal-title><![CDATA[Revista Cubana de Investigaciones Biomédicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Invest Bioméd]]></abbrev-journal-title>
<issn>0864-0300</issn>
<publisher>
<publisher-name><![CDATA[ECIMED]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03002021000400011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actividad antibacteriana de un extracto etanólico de propóleo peruano frente a Streptococcus mutans]]></article-title>
<article-title xml:lang="en"><![CDATA[Antibacterial activity of a Peruvian propolis ethanolic extract against Streptococcus mutans]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Checalla Collatupa]]></surname>
<given-names><![CDATA[Jackeline Luciana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Tito]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Práctica Privada  ]]></institution>
<addr-line><![CDATA[ Tacna]]></addr-line>
<country>Perú</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Privada de Tacna Escuela Profesional de Odontología ]]></institution>
<addr-line><![CDATA[ Tacna]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03002021000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03002021000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03002021000400011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: Los derivados del propóleo poseen propiedades antimicrobianas importantes y presentan un potencial uso para la prevención y tratamiento de la caries dental.  Objetivo:  Evaluar la actividad antibacteriana de un extracto etanólico de propóleo peruano frente a Streptococcus mutans.  Métodos:  Se obtuvo el extracto etanólico de propóleo por maceración en alcohol al 70 % durante 15 días. El extracto etanólico de propóleo fue diluido con agua destilada para obtener concentraciones de 75 %, 50 % y 25 %. La actividad antibacteriana se evaluó mediante la prueba de difusión en disco sobre medio agar cerebro-corazón inoculado con S. mutans ATCC® 25175&#8482;, se empleó clorhexidina (CHX) al 0,12 % como control. Las placas de Petri fueron incubadas por 48 horas a 37 ºC en condiciones de microaerofilia. Posteriormente se realizó la medición de los halos de inhibición con un compás Vernier.  Resultados: Todas las concentraciones del extracto etanólico de propóleo presentaron actividad antibacteriana frente al S. mutans (25 % = 17,582 ± 2,578 mm; 50 % = 16,906 ± 1,892 mm; 75 % = 16,881 ± 2,013 mm; 100 % = 17,201 ± 1,305 mm). Sin embargo, fueron menores que la CHX al 0,12 % (24,543 ± 2,486 mm) (p &lt; 0,05). Según la escala de Duraffourd, S. mutans fue sensible (+) y muy sensible (++) para todas las concentraciones del extracto etanólico de propóleo, mientras que para CHX al 0,12 % fue sumamente sensible (+++) (p &lt; 0,05).  Conclusiones:  El extracto etanólico de propóleo peruano presenta actividad antibacteriana significativa considerada como sensible y muy sensible frente a S. mutans.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: Due to their important antimicrobial properties, propolis by-products are potentially useful for the prevention and treatment of dental caries.  Objective:  Evaluate the antibacterial activity of a Peruvian propolis ethanolic extract against Streptococcus mutans.  Methods:  The propolis ethanolic extract was obtained by maceration in 70% alcohol for 15 days. The extract was diluted in distilled water to obtain concentrations of 75%, 50% and 25%. Antibacterial activity was evaluated by the disk diffusion test in brain heart agar medium inoculated with S. mutans ATCC® 25175&#8482;. Chlorhexidine (CHX) 0.12% was used as control. The Petri plates were incubated for 48 hours at 37ºC in microaerophilic conditions. The inhibition haloes were then measured with a Vernier caliper.  Results: All the concentrations of the propolis ethanolic extract displayed antibacterial activity against S. mutans: 25% = 17.582 ± 2.578 mm; 50% = 16.906 ± 1.892 mm; 75% = 16.881 ± 2.013 mm; 100% = 17.201 ± 1.305 mm. However, values were lower than those of 0.12% CHX: 24.543 ± 2.486 mm (p &lt; 0.05). According to the Duraffourd scale, S. mutans was sensitive (+) and very sensitive (++) to all propolis ethanolic extract concentrations, and highly sensitive to 0.12% chlorhexidine (+++) (p &lt; 0.05).  Conclusions:  The Peruvian propolis ethanolic extract displays significant antibacterial activity against S. mutans. Such activity was evaluated as sensitive and very sensitive.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agente antibacteriano]]></kwd>
<kwd lng="es"><![CDATA[propóleo]]></kwd>
<kwd lng="es"><![CDATA[Streptococcus mutans]]></kwd>
<kwd lng="es"><![CDATA[terpenos]]></kwd>
<kwd lng="en"><![CDATA[antibacterial agent]]></kwd>
<kwd lng="en"><![CDATA[propolis]]></kwd>
<kwd lng="en"><![CDATA[Streptococcus mutans]]></kwd>
<kwd lng="en"><![CDATA[terpenes]]></kwd>
</kwd-group>
</article-meta>
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