{"id":5602,"date":"2011-03-17T11:02:54","date_gmt":"2011-03-17T11:02:54","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/new\/olorar-el-vi-amb-miniespectrometres-identifica-rapidament-lorigen-del-vi\/"},"modified":"2015-01-15T14:07:36","modified_gmt":"2015-01-15T14:07:36","slug":"olorar-el-vi-amb-miniespectrometres-identifica-rapidament-lorigen-del-vi","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/olorar-el-vi-amb-miniespectrometres-identifica-rapidament-lorigen-del-vi\/","title":{"rendered":"Olorar el vi amb miniespectr\u00f2metres identifica r\u00e0pidament l\u2019origen del vi"},"content":{"rendered":"

Per\u00f2 aix\u00f2 nom\u00e9s s\u2019enfronta a part del problema. El frau en el vi \u00e9s dif\u00edcil de detectar per una s\u00e8rie de factors: el temps que porta entrenar un \u2018nas\u2019 per al vi, per exemple, junt amb el repte d\u2019assegurar que aquests \u2018nassos\u2019 estiguin al lloc adequat en el moment adequat \u2013 per no mencionar el fet de que ni tan sols els millors sommeliers s\u00f3n infalibles a l\u2019hora de fer una identificaci\u00f3 detallada.<\/p>\n

Per\u00f2 ara, investigadors de l\u2019IBEC, en col\u00b7laboraci\u00f3 amb la Universitat de C\u00f3rdoba, han realitzat aven\u00e7os en la lluita contra aquest problema amb el desenvolupament d\u2019un detector fiable, barat i r\u00e0pid per classificar els vins blancs segons les seves denominacions d\u2019origen, que es podrien fer servir en diversos entorns.<\/p>\n

Els cient\u00edfics varen fer servir una t\u00e8cnica anomenada espectrometria de mobilitat d\u2019ions (OMS) per analitzar aromes de vins. La IMS ionitza compostos org\u00e0nics vol\u00e0tils amb una l\u00e0mpada ultraviolada i els separa segons la seva mobilitat en un camp el\u00e8ctric a pressi\u00f3 atmosf\u00e8rica. Junt a un separador de fase gasosa per augmenta l\u2019extracci\u00f3 de l\u2019aroma i automatitzar el proc\u00e9s, el sistema d\u2019IMS va demostrar que donava resultats immediats que mantenien el tipus davant dels obtinguts per m\u00e8todes menys convenients. \u201c\u00c9s la primera vegada que la IMS s\u2019ha fet servir per classificar vins,\u201d explica Santiago Marco, responsable del grup d\u2019Olfacte Artificial de l\u2019IBEC, que va aportar el processat de dades a l\u2019estudi. \u201c\u00c9s un m\u00e8tode establert per usos en seguretat i ordre p\u00fablic, com la detecci\u00f3 de drogues i explosius, per\u00f2 nom\u00e9s s\u2019ha comen\u00e7at a fer servir en l\u2019an\u00e0lisi d\u2019aliments molt recentment.\u201d<\/p>\n

El detector supera alguns de les principals limitacions d\u2019altres m\u00e8todes no humans, com la cromatografia de gasos o l\u2019espectrometria de massa. \u201cAquestes t\u00e8cniques convencionals s\u00f3n precises, selectives i sensibles, per\u00f2 requereixen una elaborada preparaci\u00f3 de les mostres abans de l\u2019an\u00e0lisi, i tenen un rendiment molt m\u00e9s baix,\u201d explica Santiago. \u201cEl nostre sistema ofereix resultats r\u00e0pids i barats; requereix poca \u2013o cap\u2013 preparaci\u00f3 de les mostres, t\u00e9 el potencial d\u2019\u00e9sser miniaturitzat en un instrument de m\u00e0 per a l\u2019avaluaci\u00f3 in situ, i proporciona una resposta qualitativa que \u00e9s f\u00e0cil de comprendre pel personal sense preparaci\u00f3.\u201d<\/p>\n

Amb alguns fraus en el vi que mostren una faceta m\u00e9s seriosa, -l\u2019adici\u00f3 de metanol, per exemple \u2013 el detector ofereix no nom\u00e9s un m\u00e8tode de classificaci\u00f3 m\u00e9s assequible i convenient, per\u00f2 tamb\u00e9 podria oferir un pas en la direcci\u00f3 correcta per combatre un creixent problema de salut p\u00fablica. \u201cSeria interessant desenvolupar el sistema per a que sigui capa\u00e7 de detectar subst\u00e0ncies t\u00f2xiques o que deterioren el vi,\u201d comenta Santiago.<\/p>\n

Font:<\/strong> R. Garrido-Delgado, L. Arce, A.V. Guaman, A. Pardo, S. Marco & M. Valc\u00e1rcel (2011). Direct coupling of a gas-liquid separator to an Ion Mobility Spectrometer for the classification of different white wines using chemometrics tools.<\/a> Talanta<\/em>, 84 (2), 471-479<\/p>\n","protected":false},"excerpt":{"rendered":"

El frau en el vi \u00e9s un problema creixent. Els experts estimen que fins el 10% dels vins oferts als consumidors en alguns pa\u00efsos europeus s\u00f3n de menor qualitat del que indica l\u2019etiqueta.<\/h3>\n

\u00c9s un problema que afecta a tots, des dels col\u00b7leccionistes experts al consumidor mig, i tal \u00e9s la preocupaci\u00f3 en alguns pa\u00efsos que s\u2019han pres mesures dr\u00e0stiques: el Cos de Carabiners itali\u00e0, per exemple, ha format a 25 oficials com a sommelier.<\/p>\n","protected":false},"author":4,"featured_media":5600,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-5602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca"],"yoast_head":"\nOlorar el vi amb miniespectr\u00f2metres identifica r\u00e0pidament l\u2019origen del vi - Institute for Bioengineering of Catalonia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ibecbarcelona.eu\/ca\/olorar-el-vi-amb-miniespectrometres-identifica-rapidament-lorigen-del-vi\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Olorar el vi amb miniespectr\u00f2metres identifica r\u00e0pidament l\u2019origen del vi - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"El frau en el vi \u00e9s un problema creixent. 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