<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2025000200480</article-id>
<article-id pub-id-type="doi">10.29356/jmcs.v69i2.2245</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Phytochemical Profile and Insecticidal Potential of Leaf Essential Oil of Psidium guajava Growing in North Central Nigeria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Usman]]></surname>
<given-names><![CDATA[Lamidi Ajao]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Akpan]]></surname>
<given-names><![CDATA[Etimbuk Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ojumoola]]></surname>
<given-names><![CDATA[Olusegun Adebayo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ismaeel]]></surname>
<given-names><![CDATA[Ridwan Olanrewaju]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simbiat]]></surname>
<given-names><![CDATA[Aliu Bola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Ilorin Department of Chemistry ]]></institution>
<addr-line><![CDATA[ Kwara State]]></addr-line>
<country>Nigeria</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Ilorin Department of Crop Protection ]]></institution>
<addr-line><![CDATA[ Kwara State]]></addr-line>
<country>Nigeria</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>69</volume>
<numero>2</numero>
<fpage>480</fpage>
<lpage>488</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2025000200480&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2025000200480&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2025000200480&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Loss of stored maize grains due to infestation by Sitophylus zeamais contributes to food insecurity. This necessitates farmers' use of synthetic chemicals to curtail the pest. Unfortunately, the pesticides are toxic to humans and unsafe for the environment. Interestingly, some plants possess phytochemicals that exhibit insecticidal activity without these drawbacks. This activity is linked to the type of phytochemicals, whose presence depends on environmental conditions that change with the time of collection of plant samples. On this basis, we investigated how the time of harvest affects the phytochemicals and insecticidal activity of P. guajava leaf essential oils. To accomplish this, pulverized leaves (500 g) from 7.00 am and 1.00 pm harvests were hydrodistilled individually for three hours using a Clevenger setup. GC-MS technique was used to characterize the oils, while contact toxicity bioassay was used to assess the insecticidal activity of the oils. The yields of essential oils obtained from the leaves were 0.27 ± 0.015 and 0.24 ± 0.018 % (w/w). &#946;-Caryophyllene (14.7 and 18.2 %), &#945; -guaiene (13.7 and 10.6 %), &#945;-selinene (10.9 and 12.9 %), globulol (9.5 and 8.1 %), caryophyllene oxide (7.8 and 7.0 %) and eucalyptol (5.6 and 5.8 %) existed in higher quantities in the GC-MS results. Both oils were active against S. zeamais with LT50 of 59.23 and 121.09 hours, and the highest activity was recorded for the afternoon oil harvest. Therefore, the oil from the afternoon harvest can serve as a cheaper and more innocuous substitute to synthetic insecticide for S. zeamais management in stored maize.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La pérdida del maíz almacenado por la infestación de Sitophylus zeamais contribuye a la inseguridad alimentaria. Lo anterior requiere el uso de substancias sintéticas para detener la peste, las cuales son tóxicas e inseguras para el ambiente. Interesantemente, algunas plantas poseen substancias que muestran actividad insecticida sin las desventajas mencionadas. Esta bioactividad está ligada al tipo de fitoquímicos, cuya presencia depende de las condiciones ambientales que cambian con el tiempo de colecta de las plantas. Sobre esta base, investigamos el efecto del tiempo de cosecha con respecto a la actividad insecticida del aceite esencial de la hoja de la guayaba. Para el logro del objetivo, hojas pulverizadas (500 g) de cosechas de 7:00 am y 1.00 pm fueron hidrodestiladas individualmente por tres horas, usando un equipo Clevenger. Se empleó el análisis por CG-EM para la caracterización de los aceites y se empleó el ensayo de toxicidad por contacto para la valoración de la actividad insecticida. Los rendimientos de los componentes mayoritarios de los aceites esenciales fueron 0.27 ± 0.015 y 0.24 ± 0.018 % (w/w). &#946;-Cariofileno (14.7 y 18.2 %), &#945;-guayeno (13.7 y 10.6 %), &#945;- selineno (10.9 y 12.9 %), globulol (9.5 y 8.1 %), óxido de cariofileno (7.8 and 7.0 %) y eucaliptol (5.6 and 5.8 %). Ambos aceites fueron activos contra S. zeamais con LT50 de 59.23 y 121.09 h, y la mayor actividad fue registrada para la cosecha después del mediodía. Por lo anterior, la cosecha vespertina puede servir como un substituto barato e inocuo a insecticidas sintéticos contra S. zeamais en el manejo de maíz almacenado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Psidium]]></kwd>
<kwd lng="en"><![CDATA[guajava]]></kwd>
<kwd lng="en"><![CDATA[&#946;-caryophyllene]]></kwd>
<kwd lng="en"><![CDATA[insecticidal activity]]></kwd>
<kwd lng="es"><![CDATA[Psidium guajava]]></kwd>
<kwd lng="es"><![CDATA[&#946;-cariofileno]]></kwd>
<kwd lng="es"><![CDATA[actividad insecticida]]></kwd>
</kwd-group>
</article-meta>
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