{"id":2781,"date":"2016-05-16T17:43:07","date_gmt":"2016-05-16T16:43:07","guid":{"rendered":"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/?p=2781"},"modified":"2016-05-17T18:07:04","modified_gmt":"2016-05-17T17:07:04","slug":"determinacio-olor-i-gust-pel-metode-agbar","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/modul-b\/determinacio-olor-i-gust-pel-metode-agbar\/","title":{"rendered":"Determinaci\u00f3 olor i gust pel m\u00e8tode Agbar"},"content":{"rendered":"

https:\/\/www.youtube.com\/watch?v=UoZmW9udXB8<\/p>\n

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Vaig tenir la sort de poder realitzar les pr\u00e0ctiques de la FCT (Formaci\u00f3 en Centres de Treball) a un dels laboratoris m\u00e9s ben equipat i avan\u00e7at de l\u2019actualitat, al laboratori d’Aig\u00fces de Barcelona<\/a> a Collblanc. M\u00e9s concretament, treballava a l’\u00e0rea de qu\u00edmica, anomenada an\u00e0lisi d’aig\u00fces naturals de consum. Durant 6 mesos, vaig poder aplicar i aprofundir els coneixements que aprenia en els diferents cr\u00e8dits del cicle. Per exemple, entre d\u2019altres, realitzant volumetries o fent dilucions de patrons de concentraci\u00f3 coneguda, per despr\u00e9s analitzar-les instrumentalment mitjan\u00e7ant l’espectrofot\u00f2metre. B\u00e0sicament a la nostra secci\u00f3, analitz\u00e0vem i control\u00e0vem tots els contaminants inorg\u00e0nics que podien contenir les aig\u00fces naturals.<\/p>\n

<\/p>\n

A m\u00e9s a m\u00e9s, una de les activitats que tamb\u00e9 realitzava era preparar i analitzar les mostres que havien d’analitzar els panelistes del panell de gustos i olors. El m\u00e8tode d’Aig\u00fces de Barcelona<\/a> \u00e9s un m\u00e8tode propi, caracter\u00edstic i diferent de la resta de m\u00e8todes per analitzar el gust i l’olor. Tamb\u00e9 \u00e9s conegut amb el nom de FPA (Flavor Profile Analysis<\/em><\/strong><\/a>). Aquest m\u00e8tode utilitza un grup de 4, 5 o 6 panelistes per examinar les caracter\u00edstiques sensorials de les mostres d’aigua. El gust es determina tastant i esbandint la boca amb la mostra a analitzar. Per altra banda, l’olor \u00e9s determinat ensumant la mostra. L\u2019an\u00e0lisi es basa en una roda d’olors i gustos que relaciona els atributs de les mostres amb els components que poden generar aquella olor o gust. \u00c9s indispensable que cada panelista hagi estat format pr\u00e8viament. La formaci\u00f3 serveix perqu\u00e8 tots els panelistes descriguin una mateixa percepci\u00f3 de la mateixa manera. L’entrenament i formaci\u00f3 dels panelistes es realitza utilitzant patrons est\u00e0ndard de refer\u00e8ncia.<\/p>\n

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Primerament, els panelistes anoten les seves percepcions de manera individual. Els resultats individuals s\u00f3n importants, ja que poden desvelar un canvi o l’aparici\u00f3 d’una nova olor o gust. Tot i aix\u00ed, el resultat final es fa en consens considerant les percepcions de tots els panelistes. La temperatura afecta en la intensitat de l’olor. En la majoria de compostos, l’olor augmenta a mesura que augmenta la temperatura perqu\u00e8 hi haur\u00e0 m\u00e9s mol\u00e8cules de les subst\u00e0ncies odor\u00edferes que es volatilitzaran. Aix\u00ed doncs, l’an\u00e0lisi de l’olor es fa a 45\u202f\u00b0C, ja que la intensitat ser\u00e0 major i ser\u00e0 m\u00e9s f\u00e0cil fer la detecci\u00f3 que si es fes a 25\u202f\u00b0C. En canvi, el gust es realitzar\u00e0 a 25\u202f\u00b0C perqu\u00e8 si es fes a 45\u202f\u00b0C, es podrien lesionar les papil\u00b7les gustatives. A banda de la temperatura, tamb\u00e9 es diferencien per la quantitat de mostra que es necessita per realitzar l’an\u00e0lisi. Per a l’olor, s’utilitzen 200 mL de mostra que es dipositen en un Erlenmeyer de 500 ml perqu\u00e8 hi hagi suficient espai per a les part\u00edcules vol\u00e0tils. En canvi, per fer el gust es posen 500 mL en un Erlenmeyer tamb\u00e9 de 500 ml i despr\u00e9s a l’hora de realitzar l’an\u00e0lisi es reparteix en diferents gots per a cada panelista.<\/p>\n

\"IMG_1160_opt\"<\/a><\/p>\n

\"IMG_1168\"<\/a><\/p>\n

\"IMG_1170\"<\/a><\/p>\n

Finalment, qualificar la meva experi\u00e8ncia com a molt enriquidora tant pels coneixements adquirits com per a la meva formaci\u00f3 com a persona. Era el primer contacte que tenia amb el m\u00f3n laboral i ha sigut molt positiu. Des del primer dia, m\u2019han fet sentir com un m\u00e9s i han dipositat tota la confian\u00e7a en mi. Agrair tots els coneixements que m\u2019han ensenyat i que m\u2019han fet cr\u00e9ixer com a persona.<\/p>\n

\"IMG_1174\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

https:\/\/www.youtube.com\/watch?v=UoZmW9udXB8   Vaig tenir la sort de poder realitzar les pr\u00e0ctiques de la FCT (Formaci\u00f3 en Centres de Treball) a […]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[268,174],"tags":[284,277,278],"class_list":["post-2781","post","type-post","status-publish","format-standard","hentry","category-fct","category-modul-b","tag-c4","tag-gust","tag-olor"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/posts\/2781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/users\/52"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/comments?post=2781"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/posts\/2781\/revisions"}],"predecessor-version":[{"id":2937,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/posts\/2781\/revisions\/2937"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/media?parent=2781"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/categories?post=2781"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-json\/wp\/v2\/tags?post=2781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}