<?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>1390-0129</journal-id>
<journal-title><![CDATA[Revista Politécnica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Politéc. (Quito)]]></abbrev-journal-title>
<issn>1390-0129</issn>
<publisher>
<publisher-name><![CDATA[Escuela Politécnica Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1390-01292023000200063</article-id>
<article-id pub-id-type="doi">10.33333/rp.vol51n2.06</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Preparación y Caracterización de Complejos de Curcumina con Zinc(II), Níquel(II), Magnesio(II), Cobre(II) y su Evaluación Frente a Bacterias Grampositiva y Gramnegativa]]></article-title>
<article-title xml:lang="en"><![CDATA[Preparation and Characterization of Curcumin Complexes with Zinc(II), Nickel(II), Magnesium(II), Copper(II) and their Evaluation Against Gram-positive and Gram-negative Bacteria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Cornejo]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado-Villanueva]]></surname>
<given-names><![CDATA[Jenny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Mayor de San Marcos Facultad de Química e Ingeniería Química Departamento Académico de Química Inorgánica]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Perú</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2023</year>
</pub-date>
<volume>51</volume>
<numero>2</numero>
<fpage>63</fpage>
<lpage>72</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S1390-01292023000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S1390-01292023000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S1390-01292023000200063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se han preparado complejos metálicos de cobre(II), zinc(II), níquel(II) y magnesio(II) con el ligando curcuminato, en la relación molar 2:1 ligando:metal, en etanol como disolvente: [M(curcumina)2] (M = Ni2+, Cu2+, Mg2+ y Zn2+). La relación estequiométrica ligando-metal (2:1) se determinó por el método espectrofotométrico de Job (método de las variaciones continuas). Los complejos fueron caracterizados por análisis elemental, espectrometría de masas, espectroscopia infrarroja, espectroscopia fotoelectrónica de rayos X (XPS) y resonancia magnética nuclear (1H-RMN, 13C-RMN). En el complejo, cada curcuminato se enlaza al metal a través de dos átomos de oxígeno (C=O y C-O-) formando anillos quelatos de 6 miembros que actúan como un ligando bidentado. Los resultados del estudio antibacteriano de los complejos preparados frente a Staphylococcus aureus (grampositivo) y Escherichia coli (gramnegativo), a través el método Kirby-Bauer (método de difusión en Agar), revelan que todos los complejos presentan importante actividad antibacteriana frente al Staphylococcus aureus, destacándose el complejo de curcumina-zinc que presenta actividad biológica frente a esta bacteria aun a concentraciones bajas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Copper(II), zinc(II), nickel(II) and magnesium(II) complexes have been prepared with the ligand curcuminate, in a molar ratio of 2:1 ligand:metal, in ethanol as solvent: [M(curcumin )2] (M = Ni2+, Cu2+, Mg2+ and Zn2+). Job's spectrophotometric method (method of continuous variations) was used to determine the stoichiometric Ligand-Metal ratio (2:1). A number of techniques were used to characterize the complexes, including elemental analysis, mass spectrometry, infrared spectroscopy, X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (1H-NMR, 13C-NMR). Each curcuminate binds to the metal through two oxygen atoms (C=O and C-O-), forming six-membered chelate rings. The results of the antibacterial study of the complexes prepared against Staphylococcus aureus (gram-positive) and Escherichia coli (gram-negative), by means of the Kirby-Bauer method (agar diffusion method), indicate that all of the complexes present significant antibacterial activity against Staphylococcus aureus, particularly the curcumin-zinc complex, which has significant antibacterial activity against Staphylococcus aureus even at low concentrations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[curcumina]]></kwd>
<kwd lng="es"><![CDATA[complejos de curcumina]]></kwd>
<kwd lng="es"><![CDATA[actividad biológica]]></kwd>
<kwd lng="es"><![CDATA[curcumina-metal]]></kwd>
<kwd lng="es"><![CDATA[estudios espectrales]]></kwd>
<kwd lng="en"><![CDATA[curcumin]]></kwd>
<kwd lng="en"><![CDATA[curcumin complexes]]></kwd>
<kwd lng="en"><![CDATA[biological activity]]></kwd>
<kwd lng="en"><![CDATA[curcumin-metal]]></kwd>
<kwd lng="en"><![CDATA[spectral studies]]></kwd>
</kwd-group>
</article-meta>
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