{"id":25654,"date":"2024-05-04T18:43:12","date_gmt":"2024-05-04T16:43:12","guid":{"rendered":"https:\/\/agora.xtec.cat\/iesmarti-i-pol\/?p=25654"},"modified":"2025-02-17T13:44:44","modified_gmt":"2025-02-17T12:44:44","slug":"farmacia-antocianines-de-la-col-lombarda","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/iesmarti-i-pol\/departaments-cicles\/sanitat\/farmacia-antocianines-de-la-col-lombarda\/","title":{"rendered":"Farm\u00e0cia: antocianines de la col lombarda"},"content":{"rendered":"

Sabeu que determinats aliments contenen subst\u00e0ncies naturals que ens poden servir per valorar el pH d\u2019una mostra?<\/span><\/p>\n

S\u2019anomenen indicadors de pH aquelles subst\u00e0ncies que canvien de color segons estiguin en un medi \u00e0cid o b\u00e0sic. Les antocianines s\u00f3n un tipus de flavonoides que constitueixen un grup de pigments hidrosolubles responsables de la coloraci\u00f3 t\u00edpica de moltes flors, fruites i hortalisses, podent actuar com indicadors naturals de pH. Als extractes vegetals es poden trobar varis tipus d\u2019antocianines juntes. Aix\u00f2 atribueix a cada extracte una composici\u00f3 \u00fanica que li conferir\u00e0 uns canvis de color espec\u00edfics davant el pH. <\/span>En el cas concret de l\u2019extracte de col lombarda <\/span>(<\/span>Brassica oleracea<\/i><\/span><\/span><\/strong>) <\/span>els colors van des del vermell (\u00e0cid) fins a diferents tonalitats de blau, verd i groc (b\u00e0sic) passant pel violeta (neutre).<\/span><\/p>\n

Els alumnes de primer de farm\u00e0cia van poder posar de relleu l\u2019activitat indicadora d\u2019aquest vegetal al laboratori. El primer pas va ser obtenir un extracte concentrat de les antocianines presents a les fulles de la col. Aix\u00f2 ho van fer utilitzant una de les eines b\u00e0siques del m\u00f3n farmac\u00e8utic: el morter. Posteriorment van afegir petits volums de l\u2019extracte obtingut a diverses dissolucions i van poder observar quins viratges es donaven depenent del pH de la mostra.<\/span><\/p>\n

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\"\"\u00a0\u00a0 <\/a>\"\"<\/a><\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Sabeu que determinats aliments contenen subst\u00e0ncies naturals que ens poden servir per valorar el pH d\u2019una mostra? S\u2019anomenen indicadors de pH aquelles subst\u00e0ncies que canvien de color segons estiguin en un medi \u00e0cid o b\u00e0sic. Les antocianines s\u00f3n un tipus de flavonoides que constitueixen un grup de pigments hidrosolubles responsables de la coloraci\u00f3 t\u00edpica de […]<\/p>\n","protected":false},"author":70,"featured_media":25669,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"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 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