<?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>2007-3380</journal-id>
<journal-title><![CDATA[Revista bio ciencias]]></journal-title>
<abbrev-journal-title><![CDATA[Revista bio ciencias]]></abbrev-journal-title>
<issn>2007-3380</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Nayarit]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33802019000100115</article-id>
<article-id pub-id-type="doi">10.15741/revbio.06.e465</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of 4-hexilresorcinol and sodium metabisulfite on melanosis in fresh shrimps (Penaeus vannamei)]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos del 4-hexilresorcinol y metabisulfito de sodio sobre la melanosis en camarones frescos (Penaeus vannamei)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bermúdez-Medranda]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Panta-Vélez]]></surname>
<given-names><![CDATA[R. P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Técnica de Manabí Facultad de Ciencias Veterinarias Escuela en Acuicultura y Pesquerías]]></institution>
<addr-line><![CDATA[Bahía de Caráquez Manabí]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>6</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33802019000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33802019000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33802019000100115&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Ecuador is an important source of food for the crustacean Peneus vannamei worldwide, generating economic resources for the country. The shrimps after their death go through a process of blackening affecting their commercial value, being the cause of greater rejection of the product in the international market the melanosis in the shrimp, which is a change of color of the surface caused by enzymatic formation of compounds precursors which can spontaneously polymerize and/or react with cellular components to form insoluble pigments. A method used to prevent melanosis is the addition of preservatives in the post-harvest management of shrimp. The objective of the present study was to evaluate concentrations of sodium metabisulfite at 4 and 6 % and 4-hexylresorcinol at 2 and 2.5 %, as inhibitors of melanosis. The residual levels obtained from the treatments were determined by means of the modified Monier Williams method for sodium metabisulfite and the technique of Nakazato et al. (2005) (HPLC-UV) for residual determination of 4-Hexylresorcinol. The results obtained showed that the two preservatives meet the residual levels allowed in European legislation. Likewise, the organoleptic factors of odor, color and flavor for the sensory analysis and the microbiological characteristics: did not reveal significant differences in any of the treatments tested. The determination of the percentage of shrimp affected with melanosis in the test of resistance of raw shrimp for 6 hours in environmental exposure, indicate significant differences between the control and the preservatives evaluated (p&lt;0.0001). The antimelanosis action was verified in treatments with 4-hexylresorcinol, an additive considered GRAS (Generally Recognized as Safe), which was as effective as sodium metabisulfite.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Ecuador constituye a nivel mundial una fuente importante de alimentación del crustáceo Penaeus vannamei, generando recursos económicos para el país. Los camarones tras su muerte a traviesan por un proceso de ennegrecimiento afectando su valor comercial, siendo la causa de mayor rechazo del producto en el mercado internacional la melanosis en el camarón, la cual es un cambio de color de la superficie causado por formación enzimática de compuestos precursores los cuales pueden polimerizarse espontáneamente y/o reaccionar con componentes celulares para formar pigmentos insolubles. Un método utilizado para evitar la melanosis es la adición de preservantes en el manejo post cosecha del camarón. El objetivo del presente estudio fue evaluar concentraciones de metabisulfito de sodio a 4 y 6 % y 4-hexilresorcinol a 2 y 2.5 %, como inhibidores de la melanosis. Se determinó los niveles residuales obtenidos de los tratamientos, por medio del método de Monier Williams modificado para metabisulfito de sodio y la técnica de Nakazato et al. (2005) (HPLC-UV) para determinación residual de 4-Hexilresorcinol. Los resultados obtenidos mostraron que los dos preservantes cumplen con los niveles residuales permitidos en la legislación europea. Asimismo, los factores organolépticos de olor, color y sabor para el análisis sensorial y las características microbiológicas: no revelaron diferencias significativas en ninguno de los tratamientos probados. La determinación del porcentaje de camarones afectados con melanosis en la prueba de resistencia de los camarones crudos por 6 horas en exposición ambiental, indican diferencias significativas entre el control y los preservantes evaluados (p&lt;0.0001). La acción antimelanósica se verificó en los tratamientos con 4-hexilresorcinol, aditivo considerado GRAS (Generalmente Reconocido como Seguro), el cual resultó tan eficaz como el metabisulfito de sodio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Melanization]]></kwd>
<kwd lng="en"><![CDATA[shrimp]]></kwd>
<kwd lng="es"><![CDATA[Melanización]]></kwd>
<kwd lng="es"><![CDATA[camarón]]></kwd>
</kwd-group>
</article-meta>
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