<?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>2215-3470</journal-id>
<journal-title><![CDATA[Uniciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Uniciencia]]></abbrev-journal-title>
<issn>2215-3470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional, Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34702024000100551</article-id>
<article-id pub-id-type="doi">10.15359/ru.38-1.30</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Antimicrobial Activity of Diverse Chemotypes of Lippia graveolens Against Aeromonas hydrophila Isolated from Oreochromis niloticus]]></article-title>
<article-title xml:lang="es"><![CDATA[Actividad antimicrobiana de diversos quimiotipos de Lippia graveolens contra Aeromonas hydrophila aislada de Oreochromis niloticus]]></article-title>
<article-title xml:lang="pt"><![CDATA[Atividade antimicrobiana de vários quimiotipos de Lippia graveolens contra Aeromonas hydrophila isolada de Oreochromis niloticus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Pérez]]></surname>
<given-names><![CDATA[Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Sabino]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Elvira]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ribeiro da Silva]]></surname>
<given-names><![CDATA[Antonio Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ulloa-Rojas]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Instituto Tecnológico de Costa Rica Universidad Estatal a Distancia]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de San Carlos de Guatemala Centro de Estudios del Mar y Acuicultura ]]></institution>
<addr-line><![CDATA[Guatemala ]]></addr-line>
<country>Guatemala</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de San Carlos de Guatemala Facultad de Ciencias Químicas y Farmacia Escuela de Química]]></institution>
<addr-line><![CDATA[Guatemala ]]></addr-line>
<country>Guatemala</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán ]]></institution>
<addr-line><![CDATA[Estado de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidade Federal do Rio de Janeiro (UFRJ) Instituto de Pesquisas de Produtos Naturais ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Escuela de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Heredia ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>38</volume>
<numero>1</numero>
<fpage>551</fpage>
<lpage>566</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34702024000100551&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34702024000100551&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34702024000100551&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  (Objective)  This study aimed to evaluate the antimicrobial efficacy of essential oil (EO) from diverse chemotypes of Lippia graveolens against oxytetracycline-resistant Aeromonas hydrophila, which primarily affects the tilapia aquaculture (O. niloticus) in Guatemala.  (Methodology)  L. graveolens were collected in three departments in Guatemala. The EO was obtained by hydrodistillation and characterized using gas chromatography and mass spectrometry (GC/MS). Subsequently, an antimicrobial assay was conducted using disk and dilution susceptibility tests and evaluation of synergistic interactions among the chemotypes. Each test was performed in triplicate.  (Results)  The analysis revealed the presence of twenty-seven compounds in the EO obtained from the chemotypes, with the main class being monoterpenes. The major constituents identified were cis-Dihydro-&#946;-terpineol (8.84%) in chemotype I, carvacrol (51.82%) in chemotype II, and thymol (79.62%) in chemotype III. All EO chemotypes of L. graveolens demonstrated the ability to inhibit the A. hydrophila growth. Thymol chemotype exhibited the strongest inhibitory effect against bacterial growth, with a minimum inhibitory concentration (MIC) of 92.4 µg/mL and a minimum bactericidal concentration (MBC) of 184.8 µg/mL. Furthermore, the results suggest that there is no synergistic or additive effect when combining different chemotypes of L. graveolens.  (Conclusions)  This is the first report of L. graveolens chemotypes exhibiting antimicrobial activity against oxytetracycline-resistant A. hydrophila. The findings suggest that the chemotype thymol could be a potential treatment for infections in the tilapia aquaculture in Guatemala.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  (Objetivo)  El objetivo de este estudio fue evaluar la eficiencia antimicrobiana del aceite esencial de diversos quimiotipos de Lippia graveolens contra la cepa Aeromonas hydrophila resistente a la oxitetraciclina, la cual afecta principalmente a la acuicultura de tilapia (O. niloticus) en Guatemala.  (Metodología)  L. graveolens se colectó en tres departamentos de Guatemala, los aceites esenciales (AE) se obtuvieron mediante hidrodestilación y se caracterizaron mediante cromatografía de gases y espectrometría de masas (GC/MS). Posteriormente, se realizó un ensayo antimicrobiano utilizando pruebas de susceptibilidad en disco y dilución, y se evaluaron las interacciones sinérgicas entre los diferentes quimiotipos. Cada prueba se repitió res veces.  (Resultados)  El análisis evidenció la presencia de veintisiete compuestos en los AE obtenidos de los quimiotipos, siendo los monoterpenos la clase principal. Los principales constituyentes identificados fueron cis-dihidro-&#946;-terpineol (8.84 %) en el quimiotipo I, carvacrol (51.82 %) en el quimiotipo II y timol (79.62 %) en el quimiotipo III. Todos los AE de los diferentes quimiotipos de L. graveolens demostraron capacidad para inhibir el crecimiento de A. hydrophila. En particular, el quimiotipo timol obtuvo el efecto inhibitorio más fuerte contra el crecimiento bacteriano, con una concentración mínima inhibitoria (CMI) de 92.4 µg/mL y una concentración mínima bactericida (B) de 184.8 µg/mL. Los resultados sugieren que no existe un efecto sinérgico o aditivo al combinar los diferentes quimiotipos de L. graveolens.  (Conclusiones)  Este estudio constituye el primer reporte sobre la actividad antimicrobiana de los diferentes quimiotipos de L. graveolens contra A. hydrophila resistente a la oxitetraciclina. Los hallazgos sugieren que el quimiotipo timol podría ser un tratamiento potencial para las infecciones en la acuicultura de tilapia en Guatemala.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  (Objetivo)  O objetivo deste estudo foi avaliar a eficiência antimicrobiana do óleo essencial de vários quimiotipos de Lippia graveolens contra a cepa Aeromonas hydrophila resistente à oxitetraciclina, que afeta principalmente a aquicultura de tilápia (O. niloticus) na Guatemala.  (Metodologia)  A L. graveolens foi coletada em três setores da Guatemala, os óleos essenciais (OE) foram obtidos por hidrodestilação e caracterizados por cromatografia a gás acoplada à espectrometria de massas (GC/MS). Posteriormente, foi realizado um ensaio antimicrobianos por meio de testes de suscetibilidade de disco e diluição, e foram avaliadas as interações sinérgicas entre os diferentes quimiotipos. Cada teste foi repetido três vezes.  (Resultados)  A análise revelou a presença de vinte e sete compostos nos OEs obtidos dos quimiotipos, sendo os monoterpenos a classe principal. Os principais constituintes identificados foram cis-di-hidro-&#946;- terpineol (8,84%) no quimiotipo I, carvacrol (51,82%) no quimiotipo II e timol (79,62%) no quimiotipo III. Todos os OEs dos diferentes quimiotipos de L. graveolens mostraram a capacidade de inibir o crescimento de A. hydrophila. Em particular, o quimiotipo timol obteve o efeito inibitório mais forte contra o crescimento bacteriano, com uma concentração inibitória mínima (CIM) de 92,4 &#956;g/mL e uma concentração bactericida mínima (CBM) de 184,8 &#956;g/mL. Os resultados sugerem que não há efeito sinérgico ou aditivo ao combinar os diferentes quimiotipos de L. graveolens.  (Conclusões) Este estudo é o primeiro relatório sobre a atividade antimicrobiana dos diferentes quimiotipos de L. graveolens contra A. hydrophila resistente à oxitetraciclina. Os resultados sugerem que o quimiotipo timol pode ser um tratamento em potencial para infecções na aquicultura de tilápia na Guatemala.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[essential oil]]></kwd>
<kwd lng="en"><![CDATA[oregano]]></kwd>
<kwd lng="en"><![CDATA[tilapia]]></kwd>
<kwd lng="en"><![CDATA[aquaculture]]></kwd>
<kwd lng="en"><![CDATA[thymol]]></kwd>
<kwd lng="es"><![CDATA[Aceite esencial]]></kwd>
<kwd lng="es"><![CDATA[orégano]]></kwd>
<kwd lng="es"><![CDATA[tilapia]]></kwd>
<kwd lng="es"><![CDATA[acuicultura]]></kwd>
<kwd lng="es"><![CDATA[timol]]></kwd>
<kwd lng="pt"><![CDATA[Óleo essencial]]></kwd>
<kwd lng="pt"><![CDATA[orégano]]></kwd>
<kwd lng="pt"><![CDATA[tilápia]]></kwd>
<kwd lng="pt"><![CDATA[aquicultura]]></kwd>
<kwd lng="pt"><![CDATA[timol]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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