<?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>0304-2847</journal-id>
<journal-title><![CDATA[Revista Facultad Nacional de Agronomía Medellín]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Nac. Agron. Medellín]]></abbrev-journal-title>
<issn>0304-2847</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias - Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0304-28472020000109077</article-id>
<article-id pub-id-type="doi">10.15446/rfnam.v73n1.77279</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparison of antioxidant contents of green and red leaf lettuce cultivated in hydroponic systems in greenhouses and conventional soil cultivation]]></article-title>
<article-title xml:lang="es"><![CDATA[Comparación del contenido antioxidante de lechuga verde y roja cultivada en sistemas hidropónicos en invernadero y cultivo convencional]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata-Vahos]]></surname>
<given-names><![CDATA[Isabel Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Rodas]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[David]]></surname>
<given-names><![CDATA[Dorely]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutierrez-Monsalve]]></surname>
<given-names><![CDATA[Jaime A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Restrepo]]></surname>
<given-names><![CDATA[Dagoberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Católica de Oriente Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Rionegro ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Católica de Oriente Facultad de Ingenierías Unidad de Biotecnología Vegetal]]></institution>
<addr-line><![CDATA[Rionegro ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Servicio Nacional de Aprendizaje  ]]></institution>
<addr-line><![CDATA[Rionegro ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2020</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<fpage>9077</fpage>
<lpage>9088</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0304-28472020000109077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0304-28472020000109077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0304-28472020000109077&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Hydroponic technologies have increased the cultivated area under greenhouses covered with UV filter polyethylene film. However, there is a concern about the antioxidant contents of lettuces produced under these systems. In this study, it was compared the antioxidant contents of green and red leaf lettuces produced in two hydroponic systems in a greenhouse, against the ones produced with the conventional cultivation system by Colombian farmers. The antioxidant analysis revealed significant statistical differences for DPPH and Anthocyanin analyses (P=0) versus all other culture systems. The best results were obtained in the conventional cultivation. Red lettuce obtained the highest value of FRAP (655.3±82.6 mgAAE 100g-1), ABTS (17.8±6.9 mmolTE 100g-1), total phenols (680.2±69.3 mgGAE 100g-1) and anthocyanin (126.2±6.9 mgC3G 100g-1). Green lettuce exhibited the most antioxidant activity of DPPH (20.7±5.6 mmolTE 100g-1). These results suggest a detrimental effect of the greenhouse covered with UV filter polyethylene film in the antioxidant production of lettuce. Finally, red leaf lettuce showed better antioxidant capacity independent of the cultivation system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las tecnologías hidropónicas han incrementado el área cultivada bajo invernadero cubierto con películas de polietileno con filtro UV. Sin embargo, hay una preocupación acerca del contenido de antioxidantes de las lechugas producidas en estos sistemas. En este estudio se compararon los contenidos antioxidantes de las lechugas de hoja verde y roja producidas en dos sistemas hidropónicos bajo invernadero contra las producidas en el Sistema de cultivo convencional de los agricultores colombianos. El análisis antioxidante reveló diferencias estadísticamente significativas para las técnicas DPPH y antocianinas entre los tres sistemas de cultivo. Los mejores resultados fueron obtenidos en el cultivo convencional. La lechuga roja obtuvo el valor más alto en FRAP (655.3±82.6 mgEAA 100g-1), ABTS (17.8±6.9 mmolET 100g-1), fenoles totales (680.2±69.3 mg EAG 100g-1) y antocianinas (126.2±6.9 mgE3GC 100g-1). Las lechugas verdes mostraron la mayor actividad antioxidante para DPPH (20.7±5.6 mmolET 100g-1). Estos resultados sugieren un efecto nocivo de los invernaderos cubiertos con películas de polietileno con filtro UV en la producción de antioxidantes en lechugas. Finalmente, la lechuga de hoja roja mostró mayor capacidad antioxidante independiente del tipo de cultivo.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Antioxidantes]]></kwd>
<kwd lng="es"><![CDATA[Antocianinas]]></kwd>
<kwd lng="es"><![CDATA[Sistema hidropónico]]></kwd>
<kwd lng="es"><![CDATA[Sistema aeropónico]]></kwd>
<kwd lng="en"><![CDATA[Antioxidants]]></kwd>
<kwd lng="en"><![CDATA[Anthocyanins]]></kwd>
<kwd lng="en"><![CDATA[Hydroponics]]></kwd>
<kwd lng="en"><![CDATA[Aeroponics]]></kwd>
</kwd-group>
</article-meta>
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