<?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>S1870-249X2021000200178</article-id>
<article-id pub-id-type="doi">10.29356/jmcs.v65i2.1265</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Synthesis, Characterization and Cytotoxicity Investigation of Chitosan-Amino Acid Derivatives Nanoparticles in Human Breast Cancer Cell Lines]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaboon]]></surname>
<given-names><![CDATA[Maysoon H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saleh]]></surname>
<given-names><![CDATA[Afrodet A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Al-Lami]]></surname>
<given-names><![CDATA[Hadi S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Basrah College of Science Department of Chemistry]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Iraq</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Basrah College of Science Department of Pathological Analyses]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Iraq</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>65</volume>
<numero>2</numero>
<fpage>178</fpage>
<lpage>188</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2021000200178&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2021000200178&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2021000200178&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The presence of reactive primary amines in the backbone structure of chitosan enables the derivatization with different functional groups and thereby improving and expanding its properties, such as solubility and mucoadhesiveness, for biomedical applications. In this work, chitosan was grafted with different sources of amino acids (Histidine, Aspartic acid, Glutamic acid, Glycine-Aspartic acid, and Glycine-Glutamic acid), Chitosan and its grafted amino acid derivatives were obtained in very good yield, and they were characterized by Fourier-Transform Infrared Spectroscopy (FTIR), and the resulted spectra confirmed the right structures of chitosan and its different synthesized derivatives. The chitosan and its amino acid derivatives were converted to nanoparticles in size by subjecting them to the sonication method. The Scanning Electron Microscope (SEM) was used to determine the shape and size of the prepared polymeric nanoparticles and the average nanoparticle size counted by the Image-J program. The micrographs revealed that the nanoparticles with spherical shapes and with different sizes were gained, but in general, they are less than 100nm in diameters. In vitro cytotoxicity of chitosan and chitosan derivatives prepared NPs were determined as MTT assay, against different three types of human breast cancer cell lines which are BT cell lines, MCF-7 cell lines, and SKBR3 cell lines. The cell proliferation of each type of breast cancer cell line has appeared to a highly significant decrease (p&lt;0.001), with all types of tested NPs polymers in comparison with the positive control samples, through different periods of the experiment (24, 48, and 72 hours).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La presencia de aminas primarias reactivas en la estructura del quitosano permite su funcionalización con diferentes grupos funcionales, mejorando y expandiendo sus propiedades, por ejemplo, solubilidad y mucoadhesividad, para aplicaciones biomédicas. En este trabajo se injertó quitosano con diferentes fuentes de aminoácidos (histidina, ácido aspártico, ácido glutámico, glicina-ácido aspártico y glicina-ácido glutámico). Los derivados de quitosano injertados con aminoácidos se obtuvieron con muy buen rendimiento. La caracterización por espectroscopía infrarroja (FTIR) confirmó la funcionalización del quitosano. Después de sonicación y una caracterización por microscopía electrónoica de barrido (SEM), se confirmó que el tamaño del quitosano y sus derivados con aminoácidos pueden clasificarse como nanopartículas. Las micrografías revelaron que las nanopartículas tienen formas esféricas y son de diferentes tamaños, pero en general, son menores a 100 nm de diámetro. La citotoxicidad in vitro de las nanopartículas de quitosano y derivados de quitosano se determinó como ensayos MTT frente a tres tipos diferentes de líneas celulares de cáncer de mama humano, a saber, líneas celulares BT, líneas celulares MCF-7 y líneas celulares SKBR3. La proliferación celular de cada tipo de línea celular de cáncer de mama mostró una disminución significativa (p &lt;0.001), con todos los tipos de polímeros NP probados en comparación con las muestras de control positivo, a lo largo de diferentes períodos del experimento (24, 48, y 72 horas).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chitosan-grafted-amino acids]]></kwd>
<kwd lng="en"><![CDATA[nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[breast cancer cell lines]]></kwd>
<kwd lng="en"><![CDATA[cytotoxicity]]></kwd>
<kwd lng="en"><![CDATA[MTT]]></kwd>
<kwd lng="es"><![CDATA[Quitosano funcionalizado con aminoacidos]]></kwd>
<kwd lng="es"><![CDATA[nanoparticulas]]></kwd>
<kwd lng="es"><![CDATA[líneas celulares de cáncer de mama]]></kwd>
<kwd lng="es"><![CDATA[citotoxicidad]]></kwd>
<kwd lng="es"><![CDATA[ensayos MTT]]></kwd>
</kwd-group>
</article-meta>
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