<?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>S1870-249X2015000300001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Preparation of Ethyl Cellulose Nanoparticles by Solvent-Displacement Using the Conventional Method and a Recirculation System]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urbán-Morlán]]></surname>
<given-names><![CDATA[Zaida]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Elvira]]></surname>
<given-names><![CDATA[Susana E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cerón]]></surname>
<given-names><![CDATA[Ricardo S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcalá-Alcalá]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Mendoza]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ciprián-Carrasco]]></surname>
<given-names><![CDATA[Abel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piñón-Segundo]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintanar-Guerrero]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán Laboratorio de Posgrado en Tecnología Farmacéutica]]></institution>
<addr-line><![CDATA[Cuautitlán Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán Laboratorio de Microbiología y Virología de las Enfermedades Respiratorias del Cerdo]]></institution>
<addr-line><![CDATA[Cuautitlán Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Departamento de Microbiología e Inmunología]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán Unidad de Investigación Multidisciplinaria]]></institution>
<addr-line><![CDATA[Cuautitlán Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2015</year>
</pub-date>
<volume>59</volume>
<numero>3</numero>
<fpage>173</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2015000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2015000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2015000300001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Ethyl cellulose polymeric nanoparticles (NPs) were prepared using the solvent-displacement technique with ethanol as the solvent. Optimization of the method included evaluating stirring rate and stabilizer type. NPs of 142.1 to 226.5 nm were obtained in a reproducible and efficient way (95% process efficiency) and with good stability (at room temperature). Moreover, a recirculation device was used in order to obtain concentrated NPs dispersions by a continuous process with potential scale-up. This method was challenged to encapsulate a hydrophilic antiviral model molecule (glycyrrhizinic acid) resulting in low entrapment efficiencies (approximately 1%). The results indicate that NPs are obtained using this simple, economical process that offers the possibility to transport different agents for applications in food-processing, cosmetics production or pharmaceutical products.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se prepararon nanopartículas poliméricas (NPs) de etilcelulosa por la técnica de desplazamiento de disolvente usando etanol como disolvente. La optimización del método incluyó evaluación de la velocidad de agitación y el tipo de estabilizante. Se obtuvieron NPs de 142.1 a 226.5 nm en un modo reproducible y eficiente (95% eficiencia del proceso) y con buena estabilidad (a temperatura ambiente). Además, se utilizó un dispositivo de recirculación con la finalidad de obtener dispersiones concentradas por un proceso continuo con potencial de escalamiento. Este método se retó para encapsular una molécula hidrofílica antiviral modelo (ácido glicirricínico) teniendo como resultado bajas eficiencias de encapsulamiento (aproximadamente 1%). Los resultados indican que se obtienen NPs de etilcelulosa por este método simple y económico que ofrece la posibilidad de transportar diferentes agentes para su aplicación en alimentos, cosméticos o productos farmacéuticos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ethyl cellulose]]></kwd>
<kwd lng="en"><![CDATA[polymeric nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[solvent-displacement method]]></kwd>
<kwd lng="en"><![CDATA[optimization]]></kwd>
<kwd lng="en"><![CDATA[recirculation device]]></kwd>
<kwd lng="es"><![CDATA[Etilcelulosa]]></kwd>
<kwd lng="es"><![CDATA[nanopartículas poliméricas]]></kwd>
<kwd lng="es"><![CDATA[método de desplazamiento de solvente]]></kwd>
<kwd lng="es"><![CDATA[optimización]]></kwd>
<kwd lng="es"><![CDATA[dispositivo de recirculación]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Preparation of Ethyl Cellulose Nanoparticles by Solvent&#45;Displacement Using the Conventional Method and a Recirculation System</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Zaida Urb&aacute;n&#45;Morl&aacute;n,<sup>1</sup>* Susana E. Mendoza&#45;Elvira,<sup>2</sup> Ricardo S. Hern&aacute;ndez&#45;Cer&oacute;n,<sup>1</sup> Sergio Alcal&aacute;&#45;Alcal&aacute;,<sup>1</sup> Humberto Ram&iacute;rez&#45;Mendoza,<sup>3</sup> Abel Cipri&aacute;n&#45;Carrasco,<sup>2</sup> Elizabeth Pi&ntilde;&oacute;n&#45;Segundo,<sup>4</sup> David Quintanar&#45;Guerrero<sup>1</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Laboratorio de Investigaci&oacute;n y Posgrado en Tecnolog&iacute;a Farmac&eacute;utica, Facultad de Estudios Superiores Cuautitl&aacute;n, Universidad Nacional Aut&oacute;noma de M&eacute;xico. Av. 1&deg; de Mayo s/n, Santa Mar&iacute;a las Torres, Cuautitl&aacute;n Izcalli, Estado de M&eacute;xico, M&eacute;xico, C.P. 54740.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Laboratorio de Microbiolog&iacute;a y Virolog&iacute;a de las Enfermedades Respiratorias del Cerdo, Facultad de Estudios Superiores Cuautitl&aacute;n, Universidad Nacional Aut&oacute;noma de M&eacute;xico. Av. 1&deg; de Mayo s/n, Santa Mar&iacute;a las Torres, Cuautitl&aacute;n Izcalli, Estado de M&eacute;xico, M&eacute;xico, C.P. 54740.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>3</i></sup> <i>Facultad de Medicina Veterinaria y Zootecnia, Departamento de Microbiolog&iacute;a e Inmunolog&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Ciudad Universitaria, C.P. 04510, M&eacute;xico, D.F.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup><i>4</i></sup> <i>Laboratorio de Sistemas Farmac&eacute;uticos de Liberaci&oacute;n Modificada, L13, Unidad de Investigaci&oacute;n Multidisciplinaria, Facultad de Estudios Superiores Cuautitl&aacute;n, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Km 2.5 Carretera Cuautitl&aacute;n&#45;Teoloyucan, San Sebasti&aacute;n Xhala, Cuautitl&aacute;n Izcalli, Estado de M&eacute;xico, M&eacute;xico, C.P. 54714.</i></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>* Corresponding author:</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Av. 1&deg; de Mayo s/n, Santa Mar&iacute;a las Torres,    <br> Cuautitl&aacute;n Izcalli, Estado de M&eacute;xico, M&eacute;xico, C.P. 54766.    <br>  Tel +52 55 5623 20 65; Fax +52 55 5623 20 43;    <br> E&#45;mail: <a href="mailto:mzum_1212@hotmail.com">mzum_1212@hotmail.com</a>.</font></p>      <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Received April 1<sup>st</sup>, 2015;    <br> 	Accepted July 20<sup>th</sup>, 2015.</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Ethyl cellulose polymeric nanoparticles (NPs) were prepared using the solvent&#45;displacement technique with ethanol as the solvent. Optimization of the method included evaluating stirring rate and stabilizer type. NPs of 142.1 to 226.5 nm were obtained in a reproducible and efficient way (95% process efficiency) and with good stability (at room temperature). Moreover, a recirculation device was used in order to obtain concentrated NPs dispersions by a continuous process with potential scale&#45;up. This method was challenged to encapsulate a hydrophilic antiviral model molecule (glycyrrhizinic acid) resulting in low entrapment efficiencies (approximately 1%).</font></p>  	    <p align="justify"><font face="verdana" size="2">The results indicate that NPs are obtained using this simple, economical process that offers the possibility to transport different agents for applications in food&#45;processing, cosmetics production or pharmaceutical products.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> ethyl cellulose, polymeric nanoparticles, solvent&#45;displacement method, optimization, recirculation device.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se prepararon nanopart&iacute;culas polim&eacute;ricas (NPs) de etilcelulosa por la t&eacute;cnica de desplazamiento de disolvente usando etanol como disolvente. La optimizaci&oacute;n del m&eacute;todo incluy&oacute; evaluaci&oacute;n de la velocidad de agitaci&oacute;n y el tipo de estabilizante. Se obtuvieron NPs de 142.1 a 226.5 nm en un modo reproducible y eficiente (95% eficiencia del proceso) y con buena estabilidad (a temperatura ambiente). Adem&aacute;s, se utiliz&oacute; un dispositivo de recirculaci&oacute;n con la finalidad de obtener dispersiones concentradas por un proceso continuo con potencial de escalamiento. Este m&eacute;todo se ret&oacute; para encapsular una mol&eacute;cula hidrof&iacute;lica antiviral modelo (&aacute;cido glicirric&iacute;nico) teniendo como resultado bajas eficiencias de encapsulamiento (aproximadamente 1%).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los resultados indican que se obtienen NPs de etilcelulosa por este m&eacute;todo simple y econ&oacute;mico que ofrece la posibilidad de transportar diferentes agentes para su aplicaci&oacute;n en alimentos, cosm&eacute;ticos o productos farmac&eacute;uticos.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Etilcelulosa, nanopart&iacute;culas polim&eacute;ricas, m&eacute;todo de desplazamiento de solvente, optimizaci&oacute;n, dispositivo de recirculaci&oacute;n.</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v59n3/v59n3a1.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Zaida Urb&aacute;n Morl&aacute;n thanks CONACYT for funding through grant number 168259. The authors acknowledge the financial support from PAPIIT/UNAM IT201914&#45;3, CONACYT CB221629, INFRA251940 y PIAPI001.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Minost, A.; Delaveau, J.; Bolzinger, M.A.; Fessi, H.; Elaissari, A. <i>Recent Pat. Drug Deliv. 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