{"id":883,"date":"2020-07-30T17:16:14","date_gmt":"2020-07-30T13:16:14","guid":{"rendered":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/?p=883"},"modified":"2020-07-30T17:16:16","modified_gmt":"2020-07-30T13:16:16","slug":"aqprpf-01-controle-de-stabilite-dune-emulsion","status":"publish","type":"post","link":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/2020\/07\/30\/aqprpf-01-controle-de-stabilite-dune-emulsion\/","title":{"rendered":"AQPrPF 01 : contr\u00f4le de stabilit\u00e9 d&rsquo;une \u00e9mulsion"},"content":{"rendered":"\n<p><a href=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/files\/2020\/07\/AQPrPF-01-Stabilite-emulsion.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>Il s\u2019agit de soumettre un \u00e9chantillon d\u2019\u00e9mulsion \u00e0 diff\u00e9rents facteurs de stress (chaleur et force centrifuge) afin de v\u00e9rifier la non-s\u00e9paration des phases de l\u2019\u00e9mulsion.<\/p>\n\n\n\n<p>Deux tests sont effectu\u00e9s sur chaque produit&nbsp;:<\/p>\n\n\n\n<ul><li>stabilit\u00e9 \u00e0 la chaleur,<\/li><li>stabilit\u00e9 \u00e0 la centrifugation.<\/li><\/ul>\n\n\n\n<p>Une \u00e9mulsion jug\u00e9e instable est alors non-conforme.<\/p>\n\n\n\n<p><strong>1- Produits test\u00e9s par ce contr\u00f4le&nbsp;:<\/strong><\/p>\n\n\n\n<p>Toutes les \u00e9mulsions&nbsp;: cr\u00e8mes, pommades, mayonnaises, vinaigrettes\u2026\u2026.<\/p>\n\n\n\n<p><strong>2- Contr\u00f4le de la stabilit\u00e9 \u00e0 la chaleur.<\/strong><\/p>\n\n\n\n<p><strong>2-1&nbsp;: Mat\u00e9riel n\u00e9cessaire \u00e0 la r\u00e9alisation du contr\u00f4le&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>Balance,<\/li><li>Bain marie \u00e0 70\u00b0C,<\/li><li>B\u00e9cher,<\/li><li>10 g de produit \u00e0 tester.<\/li><\/ul>\n\n\n\n<p><strong>2-2&nbsp;: Mode op\u00e9ratoire&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>Dans un b\u00e9cher propre et sec, introduire 10 g d\u2019\u00e9mulsion \u00e0 tester,<\/li><li>Placer le b\u00e9cher 30 minutes au bain marie \u00e0 70\u00b0C (v\u00e9rifier la temp\u00e9rature).<\/li><li>Observer l\u2019aspect du produit.<\/li><\/ul>\n\n\n\n<p><strong>2-3&nbsp;: Expression et analyse des r\u00e9sultats&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>L\u2019\u00e9mulsion est&nbsp;<strong>stable \u00e0 la chaleur<\/strong>si on n\u2019observe aucune s\u00e9paration de phases, le produit reste homog\u00e8ne.<\/li><li>L\u2019\u00e9mulsion est&nbsp;<strong>instable \u00e0 la chaleur<\/strong>si on observe une s\u00e9paration des phases, le produit devient h\u00e9t\u00e9rog\u00e8ne.<\/li><\/ul>\n\n\n\n<p><strong>3- Contr\u00f4le de la stabilit\u00e9 \u00e0 la centrifugation.<\/strong><\/p>\n\n\n\n<p><strong>3-1&nbsp;: Mat\u00e9riel n\u00e9cessaire \u00e0 la r\u00e9alisation du contr\u00f4le&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>Balance,<\/li><li>Centrifugeuse pour tubes \u00e0 h\u00e9molyse,<\/li><li>2 tubes \u00e0 h\u00e9molyse,<\/li><li>2 g de produit<\/li><li>2 g d\u2019eau distill\u00e9e.<\/li><\/ul>\n\n\n\n<p><strong>3-2&nbsp;: Mode op\u00e9ratoire&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>Dans un tube \u00e0 h\u00e9molyse, introduire exactement 2 g d\u2019\u00e9mulsion \u00e0 tester,<\/li><li>Dans un autre tube \u00e0 h\u00e9molyse, introduire exactement 2 g d\u2019eau distill\u00e9e.<\/li><li>Placer les deux tubes face \u00e0 face dans la centrifugeuse (\u00e9quilibrage de la centrifugeuse).<\/li><li>Centrifuger 10 minutes \u00e0 1500 tour\/min, ou r.p.m. (rotations par minute).<\/li><li>Observer l\u2019aspect du tube contenant le produit \u00e0 tester.<\/li><\/ul>\n\n\n\n<p><strong>3-3&nbsp;: Expression et analyse des r\u00e9sultats&nbsp;:<\/strong><\/p>\n\n\n\n<ul><li>L\u2019\u00e9mulsion est\u00a0<strong>stable \u00e0 la centrifugation<\/strong> si on n\u2019observe aucune s\u00e9paration de phases, le produit reste homog\u00e8ne.<\/li><li>L\u2019\u00e9mulsion est\u00a0<strong>instable \u00e0 la centrifugation<\/strong> si on observe une s\u00e9paration des phases, le produit devient h\u00e9t\u00e9rog\u00e8ne.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Ouvrir en PDF. Il s\u2019agit de soumettre un \u00e9chantillon d\u2019\u00e9mulsion \u00e0 diff\u00e9rents facteurs de stress (chaleur et force centrifuge) afin de v\u00e9rifier la non-s\u00e9paration des phases de l\u2019\u00e9mulsion. Deux tests sont effectu\u00e9s sur chaque produit&nbsp;: stabilit\u00e9 \u00e0 la chaleur, stabilit\u00e9 \u00e0 la centrifugation. Une \u00e9mulsion jug\u00e9e instable est alors non-conforme&#8230;. <a class=\"continue-reading-link\" href=\"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/2020\/07\/30\/aqprpf-01-controle-de-stabilite-dune-emulsion\/\"> 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":[16],"tags":[251,236,253,252],"_links":{"self":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/883"}],"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=883"}],"version-history":[{"count":1,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/883\/revisions"}],"predecessor-version":[{"id":884,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/posts\/883\/revisions\/884"}],"wp:attachment":[{"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/media?parent=883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/categories?post=883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/portail.stpaul4.ac-reunion.fr\/wordpress\/process\/wp-json\/wp\/v2\/tags?post=883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}