{"id":2834,"date":"2024-04-08T11:35:10","date_gmt":"2024-04-08T09:35:10","guid":{"rendered":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/?p=2834"},"modified":"2024-04-15T18:58:07","modified_gmt":"2024-04-15T16:58:07","slug":"taller-experimentacio-12-loxidacio","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/portada\/taller-experimentacio-12-loxidacio\/","title":{"rendered":"Taller experimentaci\u00f3 S12: L’oxidaci\u00f3"},"content":{"rendered":"

Per a aquest experiment, comencem tallant una poma per la meitat sense pelar-la. Utilitzarem nom\u00e9s una de les meitats i la dividirem en quatre parts. Preparem quatre plats per a cada boc\u00ed de poma:<\/p>\n

    \n
  1. Emboliquem r\u00e0pidament amb film transparent un dels bocins de poma.<\/li>\n
  2. Col\u00b7loquem un altre boc\u00ed dins el gel.<\/li>\n
  3. Aboquem suc de llimona sobre un altre boc\u00ed.<\/li>\n
  4. Deixem el quart boc\u00ed sense tractament.<\/li>\n<\/ol>\n

    Observem l’aspecte de cada boc\u00ed despr\u00e9s de 15, 30 i 45 minuts.<\/p>\n

    El fenomen d’enfosquiment enzim\u00e0tic o oxidaci\u00f3 enzim\u00e0tica ocorre quan certs components de les fruites entren en contacte amb l’oxigen de l’aire, provocant una oxidaci\u00f3 que fa que es tornin marrons. Aquest proc\u00e9s \u00e9s accelerat per la pres\u00e8ncia d’enzims, els quals s\u00f3n mol\u00e8cules que accelera les reaccions qu\u00edmiques.<\/p>\n

    En el nostre experiment, l’acidesa del suc de llimona i el fred del gel redueixen la velocitat d’activitat dels enzims responsables de l’enfosquiment enzim\u00e0tic. Per tant, els bocins tractats amb aquests elements no es tornen marrons o ho fan de manera m\u00e9s lenta. A m\u00e9s, embolicar la poma amb film transparent evita que l’oxigen de l’aire hi tingui acc\u00e9s, inhibint tamb\u00e9 l’oxidaci\u00f3. El boc\u00ed que roman en contacte amb l’aire mostra un enfosquiment r\u00e0pid. Aquesta observaci\u00f3 il\u00b7lustra com factors com l’acidesa, el fred i la barrera f\u00edsica poden influir en el proc\u00e9s d’enfosquiment enzim\u00e0tic de les fruites com la poma.<\/p>\n

    Ara ja sabem que hem de fer per evitar l’oxidaci\u00f3 !!!<\/p>\n

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

     <\/p>\n

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

    Per a aquest experiment, comencem tallant una poma per la meitat sense pelar-la. Utilitzarem nom\u00e9s una de les meitats i la dividirem en quatre parts. Preparem quatre plats per a cada boc\u00ed de poma: Emboliquem r\u00e0pidament amb film transparent un dels bocins de poma. Col\u00b7loquem un altre boc\u00ed dins el gel. Aboquem suc de llimona […]<\/p>\n","protected":false},"author":4,"featured_media":2839,"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 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":[164,4,163],"tags":[171],"class_list":["post-2834","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-experimentacio-tallers","category-portada","category-primaria-2","tag-experiments23-24"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/posts\/2834","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/comments?post=2834"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/posts\/2834\/revisions"}],"predecessor-version":[{"id":2853,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/posts\/2834\/revisions\/2853"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/media\/2839"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/media?parent=2834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/categories?post=2834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/escoladelpoblenoudeldelta\/wp-json\/wp\/v2\/tags?post=2834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}