<?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>0121-4004</journal-id>
<journal-title><![CDATA[Vitae]]></journal-title>
<abbrev-journal-title><![CDATA[Vitae]]></abbrev-journal-title>
<issn>0121-4004</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Química Farmacéutica, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-40042011000200012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[LA NARIZ ELECTRÓNICA, UNA NOVEDOSA HERRAMIENTA PARA EL CONTROL DE PROCESOS Y CALIDAD EN LA INDUSTRIA AGROALIMENTARIA]]></article-title>
<article-title xml:lang="en"><![CDATA[ELECTRONIC NOSE A NOVEL TOOL FOR QUALITY AND PROCESS CONTROL IN THE FOOD INDUSTRY]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[QUICAZÁN S]]></surname>
<given-names><![CDATA[Martha C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DÍAZ M]]></surname>
<given-names><![CDATA[Amanda C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ZULUAGA D]]></surname>
<given-names><![CDATA[Carlos M]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia sede Bogotá Instituto de Ciencia y Tecnología de Alimentos - ICTA ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia sede Bogotá Instituto de Ciencia y Tecnología de Alimentos - ICTA ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2011</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>209</fpage>
<lpage>217</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-40042011000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-40042011000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-40042011000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los sistemas de olfato electrónico, más comúnmente conocidos en la industria agroalimentaria como narices electrónicas, son considerados hoy en día como una técnica de análisis de gran aplicabilidad y una práctica no destructiva diseñada para determinar, reconocer e identificar niveles muy bajos de sustancias químicas volátiles. Un arreglo de sensores electroquímicos crea una huella única digital del alimento, haciendo posible el control de calidad, el desarrollo de productos, la caracterización, clasificación y diferenciación por origen y por estado de madurez, la evaluación de su tiempo de vida útil y también como herramienta de control para identificar problemas que amenazan la comercialización, como la falsificación y la adulteración. Este trabajo hizo una revisión bibliográfica de los últimos diez años sobre el principio básico de funcionamiento de una nariz electrónica, los componentes utilizados para su operación, entre ellos el sistema de sensores y el sistema de procesamiento de la información obtenida utilizando técnicas de estadística multivariada y de inteligencia artificial. Los datos recogidos con la nariz electrónica son objetivos, reproducibles, confiables y obtenidos en tiempo real. Los sensores identifican compuestos volátiles por grupos funcionales y mediante las técnicas de análisis estadístico multivariado garantizan su utilidad en diferentes aplicaciones industriales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Electronic nose systems, more commonly known in the food industry as electronic noses, are considered nowadays as an analytical technique with wide applicability. This is a non-destructive technique designed to analyze, recognize and identify very low levels of chemical volatile substances. An array of electrochemical sensors creates a unique digital fingerprint of the food, enabling quality control, product development, characterization, classification and origin identification, maturity stage, assessment of shelf-life and as a tool of control to identify problems that threaten the market, such as counterfeiting and adulteration. This paper reviewed the literature of the last 10 years on the basic principle of operation of an electronic nose: the components used in its operation such the sensor system and the processing information system obtained by using multivariate statistical techniques and artificial intelligence. Electronic nose data so obtained were objective, reproducible, reliable and acquired in real time. Sensors identify volatile compounds by functional groups and through statistical analysis techniques guarantee their usefulness in different industrial applications.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[arreglo de sensores]]></kwd>
<kwd lng="es"><![CDATA[compuestos volátiles]]></kwd>
<kwd lng="es"><![CDATA[sensores]]></kwd>
<kwd lng="es"><![CDATA[reconocimiento de patrones]]></kwd>
<kwd lng="es"><![CDATA[análisis estadístico multivariado]]></kwd>
<kwd lng="en"><![CDATA[Sensor array]]></kwd>
<kwd lng="en"><![CDATA[volatile compound]]></kwd>
<kwd lng="en"><![CDATA[sensors]]></kwd>
<kwd lng="en"><![CDATA[pattern recognition]]></kwd>
<kwd lng="en"><![CDATA[multivariate statistics]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>REVISIONES</b></font></p>     <p>&nbsp;</p>     <p align="center"><b><font face="Verdana, Arial, Helvetica, sans-serif" size="4">LA NARIZ ELECTR&Oacute;NICA, UNA NOVEDOSA   HERRAMIENTA PARA EL CONTROL DE PROCESOS Y CALIDAD EN LA INDUSTRIA AGROALIMENTARIA</font></b></p>     <p>&nbsp;</p>     <p align="center"><b><font face="Verdana, Arial, Helvetica, sans-serif" size="3"> ELECTRONIC NOSE A NOVEL TOOL FOR QUALITY AND PROCESS CONTROL IN THE FOOD INDUSTRY</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><b><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Martha C. QUICAZ&Aacute;N S.<sup>1</sup>; Amanda C. D&Iacute;AZ M.<sup>1</sup>; Carlos M. ZULUAGA D.<sup>2</sup></font></b></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1 Instituto de Ciencia y Tecnolog&iacute;a de Alimentos &#8211; ICTA. Universidad Nacional de Colombia sede Bogot&aacute;. Carrera 30 No. 45-03 edificio 500 C, segundo piso. Bogot&aacute;, Colombia.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2 Instituto de Ciencia y Tecnolog&iacute;a de Alimentos &#8211; ICTA. Universidad Nacional de Colombia sede Bogot&aacute;. Carrera 30 No. 45-03 edificio   500 C, segundo piso. Bogot&aacute;, Colombia. <a href="mailto:cmzuluagad@unal.edu.co">cmzuluagad@unal.edu.co</a>.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Recibido: Febrero 01 de 2010; Aceptado: Junio 16 de 2011</font></p>     <p>&nbsp;</p> <hr noshade size="1">     <p><b><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> RESUMEN</font></b></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los sistemas de olfato electr&oacute;nico, m&aacute;s com&uacute;nmente conocidos en la industria agroalimentaria como   narices electr&oacute;nicas, son considerados hoy en d&iacute;a como una t&eacute;cnica de an&aacute;lisis de gran aplicabilidad y una   pr&aacute;ctica no destructiva dise&ntilde;ada para determinar, reconocer e identificar niveles muy bajos de sustancias   qu&iacute;micas vol&aacute;tiles. Un arreglo de sensores electroqu&iacute;micos crea una huella &uacute;nica digital del alimento,   haciendo posible el control de calidad, el desarrollo de productos, la caracterizaci&oacute;n, clasificaci&oacute;n y   diferenciaci&oacute;n por origen y por estado de madurez, la evaluaci&oacute;n de su tiempo de vida &uacute;til y tambi&eacute;n   como herramienta de control para identificar problemas que amenazan la comercializaci&oacute;n, como la   falsificaci&oacute;n y la adulteraci&oacute;n. Este trabajo hizo una revisi&oacute;n bibliogr&aacute;fica de los &uacute;ltimos diez a&ntilde;os sobre   el principio b&aacute;sico de funcionamiento de una nariz electr&oacute;nica, los componentes utilizados para su   operaci&oacute;n, entre ellos el sistema de sensores y el sistema de procesamiento de la informaci&oacute;n obtenida   utilizando t&eacute;cnicas de estad&iacute;stica multivariada y de inteligencia artificial. Los datos recogidos con la nariz   electr&oacute;nica son objetivos, reproducibles, confiables y obtenidos en tiempo real. Los sensores identifican   compuestos vol&aacute;tiles por grupos funcionales y mediante las t&eacute;cnicas de an&aacute;lisis estad&iacute;stico multivariado  garantizan su utilidad en diferentes aplicaciones industriales.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Palabras clave:</b> arreglo de sensores, compuestos vol&aacute;tiles, sensores, reconocimiento de patrones, an&aacute;lisis   estad&iacute;stico multivariado. </font></p> <hr noshade size="1">     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>ABSTRACT</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Electronic nose systems, more commonly known in the food industry as electronic noses, are considered   nowadays as an analytical technique with wide applicability. This is a non-destructive technique designed   to analyze, recognize and identify very low levels of chemical volatile substances. An array of electrochemical   sensors creates a unique digital fingerprint of the food, enabling quality control, product development,   characterization, classification and origin identification, maturity stage, assessment of shelf-life and as a tool of control to identify problems that threaten the market, such as counterfeiting and adulteration. This paper reviewed the literature of the last 10 years on the basic principle of operation of an electronic nose: the components used in its operation such the sensor system and the processing information system obtained by using multivariate statistical techniques and artificial intelligence. Electronic nose data so obtained were objective, reproducible, reliable and acquired in real time. Sensors identify volatile compounds by functional groups and through statistical analysis techniques guarantee their usefulness in different industrial applications.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Keywords</b>: Sensor array, volatile compound, sensors, pattern recognition, multivariate statistics.</font></p> <hr noshade size="1">     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>INTRODUCCI&Oacute;N</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El consumidor no considera simplemente la   composici&oacute;n nutricional de un alimento (carbohidratos,   prote&iacute;na, grasa, humedad, fibra, cenizas):   tambi&eacute;n valora sus propiedades saludables y sus   caracter&iacute;sticas organol&eacute;pticas, como por ejemplo, su   aroma agradable o su apetitoso sabor. Estas caracter&iacute;sticas   del producto no se relacionan directamente   con la identificaci&oacute;n de un componente individual,   sino que son resultado de una mezcla compleja de familias de compuestos (1).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La calidad de un alimento es un concepto complejo   referido a m&uacute;ltiples caracter&iacute;sticas que lo hacen   aceptable por el consumidor. Algunos aspectos de   calidad son inocuidad, valor nutricional, funcionalidad,   y la est&eacute;tica, definida como color, textura,   sabor, aroma y apariencia; mientras los tres primeros   son cuantificables, la combinaci&oacute;n de aroma y sabor,   el <i>flavor</i>, es un componente subjetivo, importante   pero dif&iacute;cil de cuantificar y describir (2-3).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El aroma, espec&iacute;ficamente, es un destacado   atributo de calidad. Consiste en una combinaci&oacute;n   de muchas sustancias qu&iacute;micas que le dan a un   alimento caracter&iacute;sticas &uacute;nicas, que son detectadas   cuando los vol&aacute;tiles presentes entran a los pasajes   nasales y son percibidos por los receptores del   sistema olfatorio (4). La medici&oacute;n confiable y la   identificaci&oacute;n de caracter&iacute;sticas de aroma son cruciales   en el desarrollo de la ciencia y la tecnolog&iacute;a   de alimentos (5).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En los &uacute;ltimos a&ntilde;os se ha planteado el uso de   instrumentos anal&iacute;ticos que intentan emular el   proceso de identificaci&oacute;n de aromas del que dispone   el cuerpo humano mediante la construcci&oacute;n de   sistemas de olfato electr&oacute;nico, m&aacute;s conocidos como   narices electr&oacute;nicas, para la extracci&oacute;n de los rasgos   caracter&iacute;sticos de los alimentos, porque ofrecen una   alternativa r&aacute;pida y no destructiva para detectar el   aroma, y por ende, pueden ser usadas en diferentes   campos con ventajas t&eacute;cnicas y econ&oacute;micas frente   a otros procedimientos como la cromatograf&iacute;a de   gases o el an&aacute;lisis sensorial.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Esta revisi&oacute;n expone los avances logrados en   el desarrollo de las diferentes narices electr&oacute;nicas   disponibles en el mercado, su principio de funcionamiento,   las t&eacute;cnicas estad&iacute;sticas m&aacute;s utilizadas   para el procesamiento de los datos obtenidos y las   investigaciones y aplicaciones en el campo de la   industria agroalimentaria.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Principios b&aacute;sicos</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Inicialmente se har&aacute; una breve descripci&oacute;n del   sistema de olfato biol&oacute;gico, dado que los sistemas   de olfato electr&oacute;nico derivan su funcionamiento   de su comprensi&oacute;n. El sistema olfativo humano es   muy complejo y ha sido investigado exitosamente;   incluso en 2004 se le otorg&oacute; el Premio Nobel en   Fisiolog&iacute;a o Medicina a Richard Axel y Linda B.   Buch por su trabajo sobre los receptores olfatorios   y la organizaci&oacute;n del sistema olfatorio (6).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El sentido del olfato est&aacute; dividido entre la nariz   y el cerebro. Las mol&eacute;culas arom&aacute;ticas se mueven   a trav&eacute;s de las cavidades nasales hasta que llegan al   epitelio olfatorio. Esta regi&oacute;n de la mucosa nasal,   del tama&ntilde;o aproximado de una estampilla, contiene   desde 10 hasta 20 millones de neuronas olfativas.   Unas proyecciones espinosas (dendritas) de estas   neuronas se extienden hasta la superficie epitelial,   donde se conectan a unos receptores de olor espec&iacute;ficos   para ciertos aromas, como una llave en una   cerradura. Cuando una mol&eacute;cula vol&aacute;til se enlaza   con su receptor perfectamente, empieza un impulso   nervioso gracias a la liberaci&oacute;n de la prote&iacute;na G.   Los impulsos viajan por medio de axones hasta un   solo punto para cada receptor, ubicado en el bulbo   olfatorio del cerebro. Estos son puntos de ''convergencia   sin&aacute;ptica'' o glom&eacute;rulos; la convergencia debe   permitir que el cerebro sepa cu&aacute;l tipo de receptor   est&aacute; siendo estimulado (7).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Una vez es recibida la transmisi&oacute;n en varias   regiones del cerebro, los mensajes apropiados son   enviados a otras partes del cerebro y el cuerpo,   activando tanto el lenguaje corporal como las   emociones, sea para probar un alimento exquisito,   o como mecanismo de defensa ante un peligro (8).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Cualquier hip&oacute;tesis acerca de la manera como   la informaci&oacute;n de las mol&eacute;culas arom&aacute;ticas es   codificada y enviada al cerebro debe ser coherente   con varios aspectos de la percepci&oacute;n humana. El   primero es que ''el aroma'' no se refiere a cualquier   caracter&iacute;stica molecular espec&iacute;fica de la sustancia;   por ejemplo, todos los compuestos vol&aacute;tiles que contienen   azufre son ''azufrados'' pero no todos huelen   igual. Esto ilustra el segundo aspecto: ''el aroma''   es una experiencia hol&iacute;stica, es decir que mezclas   complejas, como el caf&eacute;, provocan una percepci&oacute;n   simple, al igual que una mol&eacute;cula simple. Los humanos   tienen una capacidad relativamente pobre   para discriminar los componentes de las mezclas y   no pueden distinguir m&aacute;s de tres o cuatro componentes   por separado. En la mayor&iacute;a de vol&aacute;tiles, su   identificaci&oacute;n no cambia con la concentraci&oacute;n, es   decir, hay una constancia perceptual con el incremento   de la concentraci&oacute;n. El sistema olfatorio se   caracteriza por conexiones relativamente directas a   las estructuras cerebrales implicadas en la memoria   y la emoci&oacute;n, como el hipocampo, el t&aacute;lamo y el   c&oacute;rtex frontal (9).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Con base en ello, los sistemas de olfato artificial   intentan imitar la estructura de la nariz humana.   Ambos sistemas est&aacute;n basados en receptores no   espec&iacute;ficos (c&eacute;lulas y sensores), seguidos por un   procesamiento de se&ntilde;ales. El concepto de sistema de   nariz artificial fue propuesto en 1982, en la Universidad   de Warwick, por Persaud y Dodd, 1998 (10).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los sistemas de reconocimiento de aroma aparecieron   en el mercado hacia inicios de los a&ntilde;os 90,   con el sistema Modular Sensor System - MOSES   I. Posteriormente, muc has narices electr&oacute;nicas han   salido al mercado. Este tipo de tecnolog&iacute;a es ampliamente   empleada en diferentes campos: automotriz,   monitoreo medioambiental, diagn&oacute;stico m&eacute;dico y   procesamiento de alimentos (11).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Antes de la llegada de la nariz electr&oacute;nica, el &uacute;nico   an&aacute;lisis instrumental del ''aroma'' (la mezcla de   vol&aacute;tiles presentes en el espacio gaseoso del recipiente   donde se almacena la muestra, tambi&eacute;n llamado   headspace) era la identificaci&oacute;n/cuantificaci&oacute;n de   compuestos qu&iacute;micos individuales, posterior a una   etapa de separaci&oacute;n (por ejemplo, cromatograf&iacute;a de   gases &#8211; espectrometr&iacute;a de masas GC-MS, cromatograf&iacute;a   de gases &#8211; detecci&oacute;n de llama por ionizaci&oacute;n   GC-FID) (12).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Paralelamente, como m&eacute;todo no instrumental,   el an&aacute;lisis sensorial siempre ha sido considerado   como una herramienta para la identificaci&oacute;n de   aroma, generalmente evaluado a nivel industrial por   catadores que utilizan un vocabulario limitado para   expresar el grado de calidad sensorial. El an&aacute;lisis es   conducido por un individuo y es, de alg&uacute;n modo,   subjetivo, a pesar de consistir en una respuesta r&aacute;pida   para valorar la calidad global de un alimento.   Los an&aacute;lisis sensoriales descriptivos son los m&aacute;s   utilizados para referirse al <i>flavor</i>. En este caso, un   panel entrenado utiliza un vocabulario espec&iacute;fico   para describir todos los aromas percibidos y evaluar   la calidad del producto (13-14). El panel sensorial   act&uacute;a como un instrumento que puede ser anal&iacute;tico   en naturaleza, pero demanda una alta cantidad de   tiempo y recursos. El n&uacute;mero m&iacute;nimo de panelistas   recomendado es de siete y se requieren varias horas   de entrenamiento permanente. Por otra parte, los   an&aacute;lisis instrumentales de <i>flavor</i>, como la cromatograf&iacute;a   de gases, consumen tiempo y algunas veces   son ambiguos en t&eacute;rminos de relevancia frente al   an&aacute;lisis sensorial, porque aportan informaci&oacute;n sobre   los componentes presentes en el alimento por   separado y no sobre el producto como un todo (15).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Ante esta situaci&oacute;n, para estimar la calidad de los   productos alimenticios las narices electr&oacute;nicas se   est&aacute;n convirtiendo en un medio de control no destructivo,   ampliamente aceptado como r&aacute;pido y fiable.   Estos sistemas no dan ninguna informaci&oacute;n sobre   los compuestos responsables del aroma ni sobre su   identidad. Sin embargo, con la ayuda de las t&eacute;cnicas   de inteligencia artificial apropiadas, son capaces de   reconocer el patr&oacute;n arom&aacute;tico de una muestra particular   y distinguirlo de otras muestras (16).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Un sistema de olfato electr&oacute;nico est&aacute;ndar est&aacute;   formado por tres elementos principales (ver <a href="#f1">figura   1</a>): a) un sistema de medici&oacute;n, compuesto por una   t&eacute;cnica de extracci&oacute;n de aroma o sistema de flujo   de aire, que transporta los compuestos vol&aacute;tiles de   las muestras hasta un arreglo de sensores qu&iacute;micos   que transforman la informaci&oacute;n recibida en se&ntilde;ales   el&eacute;ctricas; b) un sistema de extracci&oacute;n de los rasgos   caracter&iacute;sticos de la muestra analizada, mediante   la cuantificaci&oacute;n y transformaci&oacute;n en datos de las   se&ntilde;ales de los diferentes sensores: y c) un sistema   de reconocimiento de patrones para identificar y   clasificar el aroma de las muestras medidas (17). El   prop&oacute;sito de combinar un arreglo de sensores es   proveer una se&ntilde;al global llamada ''huella digital''   como la respuesta simple de un aroma caracter&iacute;stico   de la muestra (1).</font></p>       <p align="center"><a name="f1"></a><img src="img/revistas/vitae/v18n2/v18n2a12f1.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <b>Sensores</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En la pasada d&eacute;cada se desarrollaron diferentes   clases de sensores qu&iacute;micos para la determinaci&oacute;n   cuantitativa y cualitativa de los compuestos vol&aacute;tiles   y para encontrar la relaci&oacute;n con la calidad sensorial   del producto alimenticio estudiado (1).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Todos los tipos de sensores muestran interacciones   f&iacute;sicas y qu&iacute;micas con los compuestos vol&aacute;tiles   que se quieren medir. Los sensores integrados a la   nariz electr&oacute;nica deben cumplir los siguientes criterios:   alta sensibilidad para los compuestos qu&iacute;micos,   similar a la de la nariz humana; baja sensibilidad a   la humedad y la temperatura; alta reproducibilidad   y estabilidad; corto tiempo de reacci&oacute;n y f&aacute;cil calibraci&oacute;n   (10).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En el mercado se encuentran disponibles diferentes   clases de sensores, pero las tecnolog&iacute;as utilizadas   actualmente en narices electr&oacute;nicas son: semiconductores   de &oacute;xidos met&aacute;licos (MOS), transistores   de campo el&eacute;ctrico con semiconductores de &oacute;xido   met&aacute;lico (MOSFET), conductores de pol&iacute;mero   org&aacute;nico (CP) y cristales piezoel&eacute;ctricos (BAW)   (10). Los sensores MOS tienen selectividad y reproducibilidad   pobres, pero son poco dependientes   de la humedad, lo que les da una vida &uacute;til de entre   3 y 5 a&ntilde;os; los sensores MOSFET y CP tienen una   aceptable sensibilidad, pero sus respuestas dependen   de la temperatura de operaci&oacute;n y, en gran medida, de   la humedad, caracter&iacute;sticas que reduce su vida &uacute;til a   tiempos que oscilan entre 1 y 3 a&ntilde;os (18).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los sensores, generalmente, dan una respuesta   t&iacute;pica que representa la medida del cambio de alg&uacute;n   par&aacute;metro f&iacute;sico, por ejemplo, conductividad o corriente.   Los tiempos de respuesta van de segundos   a minutos, y su valor cambia de acuerdo con el   est&iacute;mulo recibido que proviene de los compuestos   arom&aacute;ticos de la muestra. La nariz electr&oacute;nica   est&aacute; dise&ntilde;ada con una serie de sensores, cada uno   de ellos con cierta especificidad en un grupo de   compuestos. Cada sensor, entonces, dar&aacute; un valor   de conductividad, obteni&eacute;ndose al final una matriz   de datos de m columnas por n filas, donde las columnas   ser&aacute;n el n&uacute;mero de sensores que posea la   nariz y n el n&uacute;mero de muestras. Los resultados,   por ende, deber&aacute;n ser analizados con t&eacute;cnicas de   an&aacute;lisis estad&iacute;stico multivariado (19).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>T&eacute;cnicas de an&aacute;lisis estad&iacute;stico</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Una vez obtenidas las se&ntilde;ales de los sensores de   la nariz electr&oacute;nica, es necesario implementar t&eacute;cnicas   de procesamiento de datos y, posteriormente,   interpretarlos de acuerdo con la aplicaci&oacute;n que se   desea evaluar. El uso apropiado de t&eacute;cnicas de reconocimiento   de patrones asegura que las se&ntilde;ales de   los sensores obtenidas podr&iacute;an ser apropiadamente   analizadas para construir modelos confiables, sea   para predicci&oacute;n, identificaci&oacute;n o clasificaci&oacute;n.   Algunos investigadores han utilizado t&eacute;cnicas de   procesamiento de datos para ajustar sus experimentos   (20-21); sin embargo, no hay un est&aacute;ndar de la   t&eacute;cnica de reconocimiento de patrones disponible   para el procesamiento de los datos de nariz electr&oacute;nica   (22).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las respuestas de las se&ntilde;ales generadas por los   sensores se analizan usando diferentes m&eacute;todos   anal&iacute;ticos (8). Los m&aacute;s reconocidos son: el an&aacute;lisis   gr&aacute;fico (diagrama de barras y diagramas polares),   el an&aacute;lisis estad&iacute;stico multivariado (an&aacute;lisis de componentes   principales (PCA), el an&aacute;lisis de funci&oacute;n   de discriminantes (DFA) y el an&aacute;lisis de clusters   (CA)), an&aacute;lisis de redes (redes neuronales artificiales   (ANN) y funciones de base radial (RBF)). La elecci&oacute;n   del m&eacute;todo depende de los datos disponibles y   del tipo de resultado requerido (10).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El an&aacute;lisis de componentes principales (PCA) es   el m&eacute;todo m&aacute;s com&uacute;n para visualizar y clasificar la   estructura de datos multivariados. El PCA es una   t&eacute;cnica quimiom&eacute;trica bien conocida, que proyecta   los datos en un hiperespacio reducido, definido por   los componentes principales. Estos son combinaciones   lineales de las variables originales, transformadas   de tal forma que el primer componente posea la   varianza m&aacute;s grande, que el segundo componente   principal tenga la segunda m&aacute;s grande, y as&iacute; sucesivamente.   De esta manera es posible retener un   n&uacute;mero de componentes menor que el n&uacute;mero   de variables originales, donde es posible reducir la   dimensi&oacute;n de los datos: el n&uacute;mero de componentes   que va a ser retenido puede ser elegido sobre la   base de diferentes par&aacute;metros, ligados a la varianza   explicada por cada componente principal (23, 24).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El an&aacute;lisis de funci&oacute;n de discriminantes (DFA)   es una t&eacute;cnica de diferenciaci&oacute;n probabil&iacute;stica param&eacute;trica,   que maximiza la varianza entre categor&iacute;as   y minimiza la varianza dentro de las categor&iacute;as, por   medio de una proyecci&oacute;n de datos de un espacio   multidimensional a uno reducido. As&iacute;, se obtiene   un n&uacute;mero de funciones lineales ortogonales igual   al n&uacute;mero de categor&iacute;as menos uno (25).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las redes neuronales artificiales (ANN) son estructuras   de procesamiento de informaci&oacute;n paralela   y distribuida, que intentan emular las funciones   computacionales elementales de la red nerviosa del   cerebro humano, con base en la interconexi&oacute;n de   multitud de elementos de procesamiento, cada uno   de los cuales observa un comportamiento completamente   local. Los modelos de ANN combinan   modelos matem&aacute;ticos de las c&eacute;lulas nerviosas y   modelos de arquitecturas que describen las interconexiones   existentes entre estas c&eacute;lulas. Una red   ANN se puede entrenar con el prop&oacute;sito de: solucionar   problemas complejos, para tomar la decisi&oacute;n   de asignar un dato de entrada a una clase establecida   (clasificaci&oacute;n), como un proceso de recuperaci&oacute;n de   informaci&oacute;n a partir de una entrada relacionada con   datos almacenados (asociaci&oacute;n) cuando no se conoce   una clasificaci&oacute;n de los datos de entrada la red genera   esta clasificaci&oacute;n (agrupamiento - clustering);   puede solucionar problemas de optimizaci&oacute;n de   naturaleza complicada, permite anticipar el estado   futuro de un sistema y controlar sistemas din&aacute;micos   complejos (predicci&oacute;n y control) (26).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Aplicaciones en alimentos</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los sistemas de nariz electr&oacute;nica se dise&ntilde;aron   para ser usados con numerosos productos y aplicaciones,   como alimentos, empaques, cosm&eacute;ticos,   control de calidad de materias primas y productos   elaborados; monitoreo de procesos, frescura y madurez,   investigaciones de estimaci&oacute;n del tiempo de   vida &uacute;til, valoraciones de autenticidad de productos,   clasificaci&oacute;n de esencias y perfumes, detecci&oacute;n de   microorganismos pat&oacute;genos y estudios medioambientales   (10, 27). Los an&aacute;lisis de rutina en control de   calidad de alimentos constituyen una de las aplicaciones   m&aacute;s promisorias de la nariz electr&oacute;nica (11, 12).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Monitoreo de etapas de producci&oacute;n</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Se han publicado varias aplicaciones exitosas   de la nariz electr&oacute;nica para el monitoreo de los   componentes arom&aacute;ticos en diferentes etapas de   producci&oacute;n. Las principales caracter&iacute;sticas de dichas   aplicaciones se resumen en la <a href="img/revistas/vitae/v18n2/v18n2a12t1.jpg" target="_blank">tabla 1</a>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Entre estas publicaciones se destaca el monitoreo   de la fermentaci&oacute;n en la elaboraci&oacute;n de vinos y   cervezas, el proceso de curado en jamones, la evoluci&oacute;n   de los rasgos caracter&iacute;sticos en la respuesta   de los sensores de nariz electr&oacute;nica en el secado en   frutas y hortalizas y los bioprocesos involucrados   en la elaboraci&oacute;n de alimentos, entre otros (28 - 33).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <b>Estudio de la vida &uacute;til</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Muchas aplicaciones de la nariz electr&oacute;nica   reportadas en la literatura se han dedicado a monitorear   la vida &uacute;til durante los procesos de maduraci&oacute;n   de frutas y vegetales, desde la cosecha hasta el   consumo, y en productos l&aacute;cteos y aceite de oliva,   cuyos resultados se resumen y presentan en la <a href="#t2">tabla   2</a> (12, 36-44).</font></p>       <p align="center"><a name="t2"></a><img src="img/revistas/vitae/v18n2/v18n2a12t2.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <i>Evaluaci&oacute;n de la frescura</i></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La frescura es otra propiedad de calidad importante   en la industria alimentaria. Durante el   almacenamiento se generan diferentes compuestos   vol&aacute;tiles y la nariz electr&oacute;nica ha demostrado su   potencial en la predicci&oacute;n del deterioro de diferentes   alimentos, en particular, en alimentos donde ocurre   la liberaci&oacute;n de vol&aacute;tiles debido a la r&aacute;pida degradaci&oacute;n   por contaminaci&oacute;n microbiana, por ejemplo en   pescado, ostras, camarones, huevos y carnes, como   se presenta en la <a href="#t3">tabla 3</a> (47 - 51).</font></p>       <p align="center"><a name="t3"></a><img src="img/revistas/vitae/v18n2/v18n2a12t3.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <b>Valoraci&oacute;n de la autenticidad</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Como se observa en la <a href="#t4">tabla 4</a>, la tecnolog&iacute;a de   nariz electr&oacute;nica ha encontrado su mayor campo de   aplicaci&oacute;n en este &aacute;mbito, especialmente en la identificaci&oacute;n   de la autenticidad de bebidas alcoh&oacute;licas   como el vino (54 - 56). Su aplicaci&oacute;n tambi&eacute;n incluye   la tipificaci&oacute;n de aceites de oliva, quesos, miel,   aceites vegetales, jugos de fruta y vinagres (57 - 61).</font></p>     <p>&nbsp;</p>     <p align="center"><a name="t4"></a><img src="img/revistas/vitae/v18n2/v18n2a12t4.jpg"></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <b>Control de la calidad</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En la <a href="#t5">tabla 5</a> puede observarse c&oacute;mo la nariz   electr&oacute;nica ha sido extensivamente utilizada en la   evaluaci&oacute;n y clasificaci&oacute;n de aceites de oliva extra   v&iacute;rgenes, de acuerdo con sus atributos arom&aacute;ticos.   Tambien se ha empleado en el control de calidad   de productos l&aacute;cteos, pescados, bebidas alcoh&oacute;licas,   frutas y vegetales (52, 62 - 65).</font></p>       <p align="center"><a name="t5"></a><img src="img/revistas/vitae/v18n2/v18n2a12t5.jpg"></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  Estos trabajos resaltan la tendencia actual a utilizar   herramientas anal&iacute;ticas no destructivas para la   evaluaci&oacute;n de los alimentos y demuestran que esta   tecnolog&iacute;a tiene un excelente potencial de uso en   aseguramiento y control de la calidad.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En Colombia, el Instituto de Ciencia y Tecnolog&iacute;a   de Alimentos (ICTA), de la Universidad   Nacional de Colombia, ha desarrollado investigaciones   al respecto, en especial en el estudio de   los rasgos caracter&iacute;sticos del caf&eacute; colombiano (67).   Igualmente adelanta el proyecto de investigaci&oacute;n   titulado: ''Selecci&oacute;n de indicadores fisicoqu&iacute;micos   mediante aplicaci&oacute;n de nariz electr&oacute;nica para la   catalogaci&oacute;n de productos ap&iacute;colas'', financiado por   el Ministerio de Agricultura y Desarrollo Rural,   cuyo objetivo es definir las caracter&iacute;sticas f&iacute;sicas y   qu&iacute;micas (vol&aacute;tiles y no vol&aacute;tiles) de: miel, polen y   prop&oacute;leos, que permitan establecer el espectro de   huella &uacute;nica de los productos seg&uacute;n su procedencia,   con el fin de optar por sellos de calidad, en especial   la Denominaci&oacute;n de Origen, para especies de abejas   provenientes de cuatro regiones representativas de   la producci&oacute;n nacional (Santander, Boyac&aacute;, Cundinamarca   y la Sierra Nevada de Santa Marta). Se ha   podido determinar que la nariz electr&oacute;nica es una   herramienta &uacute;til para clasificar y diferenciar estos   productos colombianos de acuerdo con su origen   geogr&aacute;fico (68 - 71).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>CONCLUSIONES</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La nariz electr&oacute;nica es una herramienta de an&aacute;lisis,   &uacute;til para la caracterizaci&oacute;n y control de productos   y procesos agroalimentarios si se consideran   sus ventajas en aspectos como movilidad, rapidez,   fiabilidad, facilidad de uso y precio. El dise&ntilde;o de   los sensores de estos instrumentos y los sistemas   de reconocimiento de patrones valoran la calidad   de una muestra sin necesidad de especificar datos   con respecto a su composici&oacute;n o concentraci&oacute;n.   La tecnolog&iacute;a de arreglo de sensores y el uso de   software aplicados al an&aacute;lisis de la huella digital de   productos alimenticios ha tenido un r&aacute;pido avance   en la investigaci&oacute;n y en su desarrollo de aplicaciones   en la industria, pero es importante fortalecer las   l&iacute;neas de investigaci&oacute;n, para incrementar la selectividad,   sensibilidad y reproducibilidad del an&aacute;lisis.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"> <b>AGRADECIMIENTOS</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los autores agradecen el apoyo para la realizaci&oacute;n   de este trabajo al Instituto de Ciencia y Tecnolog&iacute;a   de Alimentos (ICTA), de la Universidad Nacional   de Colombia, sede Bogot&aacute;; al Ministerio de   Agricultura y Desarrollo Rural, Programa J&oacute;venes   Investigadores e Innovadores, del Departamento   Administrativo de Ciencia, Tecnolog&iacute;a e Innovaci&oacute;n   &#8211; COLCIENCIAS; y al programa de maestr&iacute;a en   Ciencia y Tecnolog&iacute;a de Alimentos, de la Facultad   de Ciencias Agropecuarias de la Universidad Nacional   de Colombia, sede Medell&iacute;n.</font></p>     <p>&nbsp;</p>     ]]></body>
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