<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972025000100049</article-id>
<article-id pub-id-type="doi">10.24275/qtzi8162</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Anticoagulant activity of sulfated polysaccharides obtained from the brown seaweed Stephanocystis dioica]]></article-title>
<article-title xml:lang="es"><![CDATA[Actividad anticoagulante de polisacáridos sulfatados obtenidos del alga parda Stephanocystis dioica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Zamora]]></surname>
<given-names><![CDATA[Gabriela Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz-Ochoa]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arvizu-Higuera]]></surname>
<given-names><![CDATA[Dora Luz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Montesinos]]></surname>
<given-names><![CDATA[Yoloxochitl Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Vivas]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur  ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>49</fpage>
<lpage>56</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972025000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972025000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972025000100049&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background:  Brown algae are recognized as a source of sulfated polysaccharides of great economic value and importance in biomedical studies due to their diverse biological activities such as anticoagulant, antioxidant, antiviral, among others.  Goals:  In this study, an aqueous extract from the brown seaweed Stephanocystis dioica was evaluated to determine its potential anticoagulant activity.  Methods:  An aqueous extraction was carried out at room temperature to obtain sulfated polysaccharides, which were semi-purified by fractional precipitation with ethanol to obtain three fractions. These fractions were employed in prothrombin time (PT) and activated partial thromboplastin time (aPTT) assays to evaluate anticoagulant activity at different concentrations (6.25-100 µg mL-1). The partial chemical composition (fucose, uronic acids, and sulfates) and SO4/sugar residue ratio were also determined.  Results:  In the PT assay, at a concentration of 100 µg mL-1, fraction F3 exhibited the greatest coagulation time (76 s), which was four times that of the control. In the aPTT assay, the three fractions extended the control time (28.8 s) to more than 300 s at a concentration of 100 µg mL-1. Partial chemical analysis showed that fractions F1, F2, and F3 are sulfated heteropolysaccharides rich in fucose, with lower concentrations of uronic acids and other sugars. In the infrared spectrum, the observed vibrations at 820 cm-1 indicate a twist of the sulfate group at the equatorial position of the sugar ring at 2-O and/or 3-O positions.  Conclusions:  The results showed that sulfated polysaccharide from Stephanocystis dioica has potential anticoagulant activity.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes: Las algas pardas son reconocidas como fuente de polisacáridos sulfatados de gran valor económico e importancia en estudios biomédicos debido a sus diversas actividades biológicas como anticoagulante, antioxidante, antiviral, entre otras.  Objetivos:  Para este estudio se evaluó un extracto acuoso obtenido del alga parda Stephanocystis dioica para determinar su potencial actividad anticoagulante.  Métodos:  Se realizó una extracción acuosa a temperatura ambiente para obtener polisacáridos sulfatados, los cuales se semipurificaron por precipitación fraccionada con etanol, obteniendo tres fracciones. Estas fracciones se emplearon en ensayos de tiempo de protrombina (TP) y tiempo de tromboplastina parcial activada (TTPa) para evaluar la actividad anticoagulante a diferentes concentraciones (6.25-100 µg mL-1). También se determinó la composición química parcial (fucosa, ácidos urónicos y sulfatos) y la relación SO4/residuos de azúcar.  Resultados:  En el ensayo TP, a una concentración de 100 µg mL-1, la fracción F3 mostró el mayor tiempo de coagulación (76 s), el cual fue cuatro veces superior al tiempo del control. En el ensayo TTPa, las tres fracciones prolongaron el tiempo del control (28.98 s) a más de 300 s a una concentración de 100 µg mL-1. El análisis químico parcial mostró que las fracciones F1, F2 y F3 son heteropolisacáridos sulfatados ricos en fucosa, con menores concentraciones de ácidos urónicos y otros azúcares. En el espectro infrarrojo, las vibraciones observadas a 820 cm-1 indican una torsión del grupo sulfato en la posición ecuatorial del anillo de azúcar en las posiciones 2-O y/o 3-O.  Conclusiones:  Los resultados mostraron que el polisacárido sulfatado de Stephanocystis dioica tiene una potencial actividad anticoagulante.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[anticoagulant activity]]></kwd>
<kwd lng="en"><![CDATA[bioactive]]></kwd>
<kwd lng="en"><![CDATA[brown seaweed]]></kwd>
<kwd lng="en"><![CDATA[fucoidan]]></kwd>
<kwd lng="en"><![CDATA[uronic acids.]]></kwd>
<kwd lng="es"><![CDATA[ácidos urónicos]]></kwd>
<kwd lng="es"><![CDATA[actividad anticoagulante]]></kwd>
<kwd lng="es"><![CDATA[alga parda]]></kwd>
<kwd lng="es"><![CDATA[bioactividad]]></kwd>
<kwd lng="es"><![CDATA[fucoidan.]]></kwd>
</kwd-group>
</article-meta>
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