{"id":758,"date":"2020-07-28T16:51:04","date_gmt":"2020-07-28T12:51:04","guid":{"rendered":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/?p=758"},"modified":"2020-07-28T16:51:05","modified_gmt":"2020-07-28T12:51:05","slug":"aqprecf-22-suivi-de-depectinisation","status":"publish","type":"post","link":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/2020\/07\/28\/aqprecf-22-suivi-de-depectinisation\/","title":{"rendered":"AQPrECF 22 : suivi de d\u00e9pectinisation"},"content":{"rendered":"\n<p><a href=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/AQPrECF-22-V2-Suivi-d\u00e9pectinisation-sp4.pdf\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ouvrir en PDF.  (opens in a new tab)\">Ouvrir en PDF. <\/a><\/p>\n\n\n\n<p>Les pectinases sont des enzymes qui solubilisent les pectines contenues dans un liquide. Les pectines pr\u00e9cipitent en pr\u00e9sence d\u2019alcool absolu.<\/p>\n\n\n\n<p><strong>1 : Mat\u00e9riel n\u00e9cessaire.&nbsp;<\/strong>Photo N\u00b01.<strong><\/strong><\/p>\n\n\n\n<ul><li>Portoir \u00e0 tubes \u00e0 essai.<\/li><li>Tubes \u00e0 essai propres et secs.<\/li><li>Echantillon de jus \u00e0 tester.<\/li><li>Alcool \u00e9thylique \u00e0 96%,<\/li><li>2 pipettes gradu\u00e9es de 10 mL,<\/li><li>2 propipettes adapt\u00e9es aux pipettes de 10 mL.<\/li><\/ul>\n\n\n\n<p><strong>2&nbsp;: R\u00e9alisation du test.<\/strong><\/p>\n\n\n\n<ul><li>Noter les temps T0, T30, T60, T90 sur 4 tubes.<\/li><li>Pr\u00e9lever un peu de jus \u00e0 tester dans un erlen propre et sec. Photo N\u00b02.<\/li><li>Dans un tube \u00e0 essai introduire 5 mL de jus \u00e0 tester.<\/li><li>Ajouter 5 mL d\u2019alcool \u00e9thylique \u00e0 96%.<\/li><li>Agiter le tube.<\/li><li>Observer l\u2019apparition \u00e9ventuelle d\u2019un pr\u00e9cipit\u00e9 de pectine, test trouble (r\u00e9sultat positif). Photo N\u00b03.<\/li><li>Compl\u00e9ter la fiche de suivi de d\u00e9pectinisation.<\/li><li>Recommencer les op\u00e9rations ci-dessus toutes les 30 minutes jusqu\u2019\u00e0 l\u2019obtention d\u2019un test limpide. Photo N\u00b04.<\/li><li>L\u2019obtention d\u2019un test limpide (r\u00e9sultat n\u00e9gatif), indique qu\u2019il n\u2019y a plus de pectines insolubles dans le jus, il peut alors \u00eatre filtr\u00e9.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" width=\"471\" height=\"304\" src=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im1.png\" alt=\"\" class=\"wp-image-759\" srcset=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im1.png 471w, https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im1-300x194.png 300w, https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im1-150x97.png 150w, https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im1-232x150.png 232w\" sizes=\"(max-width: 471px) 100vw, 471px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" width=\"518\" height=\"651\" src=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im2.png\" alt=\"\" class=\"wp-image-760\" srcset=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im2.png 518w, https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im2-239x300.png 239w, https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/ECF22-im2-119x150.png 119w\" sizes=\"(max-width: 518px) 100vw, 518px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Ouvrir en PDF. Les pectinases sont des enzymes qui solubilisent les pectines contenues dans un liquide. Les pectines pr\u00e9cipitent en pr\u00e9sence d\u2019alcool absolu. 1 : Mat\u00e9riel n\u00e9cessaire.&nbsp;Photo N\u00b01. Portoir \u00e0 tubes \u00e0 essai. Tubes \u00e0 essai propres et secs. Echantillon de jus \u00e0 tester. Alcool \u00e9thylique \u00e0 96%, 2 pipettes&#8230; <a class=\"continue-reading-link\" href=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/2020\/07\/28\/aqprecf-22-suivi-de-depectinisation\/\"> Continue reading <span class=\"meta-nav\">&rarr; <\/span><\/a><\/p>\n","protected":false},"author":473,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_links_to":"","_links_to_target":""},"categories":[15],"tags":[199,200,201],"_links":{"self":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/758"}],"collection":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/users\/473"}],"replies":[{"embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/comments?post=758"}],"version-history":[{"count":1,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/758\/revisions"}],"predecessor-version":[{"id":762,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/758\/revisions\/762"}],"wp:attachment":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/media?parent=758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/categories?post=758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/tags?post=758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}