<?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>1665-1456</journal-id>
<journal-title><![CDATA[Biotecnia]]></journal-title>
<abbrev-journal-title><![CDATA[Biotecnia]]></abbrev-journal-title>
<issn>1665-1456</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-14562023000100004</article-id>
<article-id pub-id-type="doi">10.18633/biotecnia.v25i1.1680</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Chemical composition, antioxidant activity and cytotoxicity of flower extracts from Magnolia grandiflora L. found in southeast Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Composición química, actividad antioxidante y citotoxicidad de extractos de flores de Magnolia grandiflora L. encontradas en el sureste de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivas-Garcia]]></surname>
<given-names><![CDATA[Tomas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alejandre-Rosas]]></surname>
<given-names><![CDATA[Jorge Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Ligonio]]></surname>
<given-names><![CDATA[Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Morales]]></surname>
<given-names><![CDATA[Marisol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Pérez]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel-Valenzuela]]></surname>
<given-names><![CDATA[Berenice]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Veracruzana Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Técnica Estatal de Quevedo  ]]></institution>
<addr-line><![CDATA[ Los Ríos]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[ Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>25</volume>
<numero>1</numero>
<fpage>5</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-14562023000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-14562023000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-14562023000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Some reports state that different structures of M. grandiflora contain bioactive components. Nonetheless, phytochemical studies reported that the extracted essential oils are chemically different and remarkably variable in their qualitative and quantitative compositions. Further studies on the Mexican M. grandiflora needs to be done. Thus, the research aimed to characterize a) the chemical composition, b) the antioxidant activity and c) cytotoxicity effect of two M. grandiflora flower extracts. The chemical composition was evaluated by phytochemical test followed by thin layer chromatography, UV-Vis and FTIR spectrophotometer analysis. The antioxidant activity of the flower extracts was measured by the free radical-scavenging activity (ABTS) and the stable radical of 2,2-diphenyl-1-picryl-hydrazyl (DPPH) methods, and the cytotoxicity by an Artemia salina bioassay. Water and ethyl flower extracts showed the presence of organic chromophores such as flavonoids. Both extracts (ethyl and water) demonstrated antioxidant activity by both ABTS (459.6 ± 8.5 and 274.2 ± 5.7 µmol TE/g, respectively) and DPPH (3210.4 ± 2.5 and 219.7 ± 0.9 µmol TE/g, respectively) methodologies, and non-cytotoxic activity (LC50, µg/mL) (1285 ± 14 and 1116 ± 15, respectively). The water and ethyl extracts of M. grandiflora flowers found in southeast Mexico are a promissory source of chemical compounds with attributed biological activity according to the presented results.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Algunos estudios afirman que diferentes estructuras de M. grandiflora contienen componentes bioactivos. No obstante, los estudios fitoquímicos indican que los aceites esenciales extraídos son químicamente diferentes y notablemente variables en sus composiciones cualitativas y cuantitativas. Es necesario realizar más estudios sobre M. grandiflora cultivada en México. Por ello, el objetivo de esta investigación fue caracterizar a) la composición química, b) la actividad antioxidante y c) el efecto citotóxico de dos extractos de flores de M. grandiflora. La composición química se evaluó mediante una prueba fitoquímica preliminar seguida de cromatografía en capa fina y análisis espectrofotométrico mediante UV-Vis y FTIR. La actividad antioxidante de los extractos de flores se midió por el método de la actividad reductora de radicales libres (ABTS) y el método de radicales estables de 2,2-difenil-1-picril-hidrazilo (DPPH) y la citotoxicidad por un bioensayo de Artemia salina. Los extractos acuoso y etílico de flores mostraron la presencia de cromóforos orgánicos como los flavonoides. Ambos extractos (etílico y acuoso) demostraron actividad antioxidante tanto por ABTS (459.6 ± 8.5 y 274.2 ± 5.7 µmol TE/g, respectivamente) y DPPH (3210.4 ± 2.5 y 219.7 ± 0.9 µmol TE/g, respectivamente); y actividad no citotóxica (CL50, µg/mL) (1285 ± 14 y 1116 ± 15, respectivamente). Los extractos acuosos y etílicos de las flores de M. grandiflora encontradas en el sureste de México son una fuente promisoria de compuestos químicos con actividad biológica atribuida por los resultados presentados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bioactive compounds]]></kwd>
<kwd lng="en"><![CDATA[Biological activity]]></kwd>
<kwd lng="en"><![CDATA[Medicinal plants]]></kwd>
<kwd lng="es"><![CDATA[Actividad biológica]]></kwd>
<kwd lng="es"><![CDATA[Compuestos bioactivos]]></kwd>
<kwd lng="es"><![CDATA[Plantas medicinales]]></kwd>
</kwd-group>
</article-meta>
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