<?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>S0188-88972022000100025</article-id>
<article-id pub-id-type="doi">10.24275/uam/izt/dcbs/hidro/2022v32n1/lugo</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de la relación Carbono Nitrógeno y Carbono Fósforo para mejorar la producción de biomasa y ácidos grasos en Chlorella sorokiniana]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of the Carbon to Nitrogen and Carbon to Phosphorus ratios for improving the production of biomass and fatty acids in Chlorella sorokiniana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lugo-De Ossa]]></surname>
<given-names><![CDATA[Catalina Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Vanegas]]></surname>
<given-names><![CDATA[Natalia Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peñuela-Vásquez]]></surname>
<given-names><![CDATA[Mariana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Departamento de Ingeniería Química Grupo de Bioprocesos]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2022</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>25</fpage>
<lpage>31</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972022000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972022000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972022000100025&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes: Las microalgas están siendo estudias como fuente de ácidos grasos para la producción de alimentos con alto valor agregado. El contenido de aceites en estas puede aumentar o disminuir debido a cambios en los factores abióticos como la concentración de nitrógeno y fósforo en el medio de cultivo.  Objetivo: Determinar la relación carbono/nitrógeno y carbono/fosforo que favorezcan la producción de biomasa y ácidos grasos en la microalga nativa Chlorella sorokiniana.  Métodos: La microalga aislada del lago del parque norte en la ciudad de Medellín, Antioquia, Colombia, fue cultivada de forma heterotrófica con glucosa como fuente de carbono a diferentes relaciones carbono nitrógeno (C/N) (10/1, 25/1 y 50/1) y carbono fósforo (C/P) (200/1, 300/1 y 400/1).  Resultado: La máxima concentración de biomasa que se obtuvo fue de 9.70gL-1 y 9.17 gL-1 con las relaciones C/N 10/1 y C/P 200/1, sus productividades fueron de 1.08 gL-1d-1 y 1.02 gL-1d-1 y sus rendimientos de biomasa en glucosa (fueron de 0.43 y 0.44 gg-1. Los ácidos grasos totales se ven favorecidos con las relaciones C/N 50/1 y C/P 400/1 alcanzando un 24.27% y 20.48% de ácidos grasos totales sobre la biomasa seca, además de mayores productividades de ácidos grasos en biomasa seca de 26.97 mgL-1d-1 y 22.76 mgL-1d-1 respectivamente.  Conclusiones: Relaciones C/N y C/P bajas favorecen la producción de biomasa y disminuyen la producción de ácidos grasos totales, por el contrario, relaciones C/N y C/P altas, favorecen la producción de ácidos grasos totales y la productividad de lípidos en biomasa. De esta manera se debe alcanzar la máxima producción de biomasa con bajas relaciones C/N para lograr que en la etapa de agotamiento nutricional en el medio de cultivo se induzca la elongación de las cadenas de ácidos grasos poliinsaturados como respuesta a las condiciones de estrés.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background: Microalgae are being studied as a source of fatty acids to produce food with high added value. The content of oils can increase or decrease due to changes in abiotic factors such as nitrogen and phosphorus concentration in the culture medium.  Goals: To determine the carbon/nitrogen and carbon/phosphorus ratio that favor biomass and fatty acid production in the native microalgae Chlorella sorokiniana.  Methods: Microalgae isolated from the Parque Norte Lake in the city of Medellin, Antioquia, Colombia, was cultured in a heterotrophic way using glucose as carbon source at different carbon to nitrogen (C/N) (10/1, 25/1 y 50/1) and carbon to phosphorus (C/P) (200/1, 300/1 y 400/1) ratios.  Results: The highest concentration of biomass was 9.70 gL-1 and 9.17 gL-1 at C/N 10/1 and C/P 200/1. The yields were 1.08 gL-1d-1 and 1.02 gL-1d-1. The biomass yield from glucose (were 0.43gg-1 and 0.44gg-1. Total fatty acids are favored by the C/N and C/P ratios of 50/1 and 400/1, yielding 24.27% and 20.48% total fatty acids measured over dried cell weight alongside higher fatty acid yield from biomass of 26.97m gL-1d-1 and 22.76m gL-1d-1, respectively.  Conclusions: Lower C/N and C/P ratios favor the production of biomass while lowering the production of total fatty acids; conversely, higher C/N and C/P rations favor the production of total fatty acids and the lipid yield from biomass. Therefore, it is necessary to reach the highest production of biomass with low C/N ratio for enabling the elongation of the polyunsaturated fatty acid chain during the nutrient depletion stage in the culture medium as a response to the stress conditions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biomasa]]></kwd>
<kwd lng="es"><![CDATA[carbono]]></kwd>
<kwd lng="es"><![CDATA[lípidos]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[fósforo]]></kwd>
<kwd lng="en"><![CDATA[biomass]]></kwd>
<kwd lng="en"><![CDATA[carbon]]></kwd>
<kwd lng="en"><![CDATA[lipids]]></kwd>
<kwd lng="en"><![CDATA[nitrogen]]></kwd>
<kwd lng="en"><![CDATA[phosphorus]]></kwd>
</kwd-group>
</article-meta>
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