<?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>2224-5421</journal-id>
<journal-title><![CDATA[Revista Cubana de Química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cub Quim]]></abbrev-journal-title>
<issn>2224-5421</issn>
<publisher>
<publisher-name><![CDATA[Ediciones UO, Universidad de Oriente]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2224-54212019000300309</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Characterization and thermal properties of chitosan films prepared with different acid solvents]]></article-title>
<article-title xml:lang="es"><![CDATA[Caracterización y propiedades térmicas de películas de quitosana preparadas con diferentes disolventes ácidos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[C.-Eulalio]]></surname>
<given-names><![CDATA[Hugo Yves]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[B.-Rodrigues]]></surname>
<given-names><![CDATA[Jose Filipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[O.-Santos]]></surname>
<given-names><![CDATA[Kleilton]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peniche]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[V.-LiaFook]]></surname>
<given-names><![CDATA[Marcus]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Campina Grande - UFCG, Bairro Universitário CERTBIO, UAEMa ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la Habana Facultad de Química ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>31</volume>
<numero>3</numero>
<fpage>309</fpage>
<lpage>323</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2224-54212019000300309&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2224-54212019000300309&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2224-54212019000300309&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The effect of various acids on the thermal properties of chitosan films was evaluated. Films 100 &#956;m thick were prepared from chitosan solutions in different acids: acetic, citric, lactic, maleic, tartaric, hydrochloric and nitric acid. The films were analyzed by infrared spectroscopy, X-ray diffraction and thermal analysis. They were transparent and flexible and less crystalline that the chitosan powder. The nature of the acid influenced the intra-and intermolecular interactions in chitosan films, which is reflected by the shift to higher frequencies of the bands at 2 942-2 784 cm-1 and the shift to lower frequencies of the bands at 1 650, 1 590, 1 420 and 1 376 cm-1 in the infrared spectra. The thermal stability of films was lower than that of chitosan and each acid had a difference influence on it. It was concluded that the selection of the acid solvent to prepare chitosan films is important in determining its properties.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se evaluó el efecto de varios ácidos en las propiedades térmicas de películas de quitosana. Se prepararon películas de 100 &#956;m de grosor a partir de sus disoluciones en diferentes ácidos: acético, cítrico, láctico, maleico, tartárico, clorhídrico y nítrico. Las películas fueron analizadas por espectroscopía infrarroja, difracción de rayos-X y análisis térmico. Estas resultaron transparentes y flexibles y menos cristalinas que la quitosana original. La naturaleza del ácido influyó sobre las interacciones intra- e intermoleculares en las películas, lo que se refleja en el corrimiento hacia mayores frecuencias de las bandas a 2 942-2 784 cm-1y hacia menores frecuencias de aquellas a 1 650, 1 590, 1 420 y 1 376 cm-1 en los espectros. La estabilidad térmica de las películas fue inferior a la de la quitosana, y cada ácido tuvo una influencia diferente. Se concluyó que la selección del ácido para preparar las películas de quitosana es importante para determinar sus propiedades.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[chitosan]]></kwd>
<kwd lng="en"><![CDATA[films]]></kwd>
<kwd lng="en"><![CDATA[crystallinity]]></kwd>
<kwd lng="en"><![CDATA[thermal properties]]></kwd>
<kwd lng="es"><![CDATA[quitosana]]></kwd>
<kwd lng="es"><![CDATA[películas]]></kwd>
<kwd lng="es"><![CDATA[cristalinidad]]></kwd>
<kwd lng="es"><![CDATA[propiedades térmicas]]></kwd>
</kwd-group>
</article-meta>
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