{"id":2010,"date":"2016-06-07T20:42:37","date_gmt":"2016-06-07T20:42:37","guid":{"rendered":"https:\/\/askthescientists.com\/fr\/?post_type=qa&#038;p=2010"},"modified":"2019-12-19T11:50:46","modified_gmt":"2019-12-19T18:50:46","slug":"quest-ce-que-lindice-orac","status":"publish","type":"qa","link":"https:\/\/askthescientists.com\/fr\/qa\/quest-ce-que-lindice-orac\/","title":{"rendered":"Qu\u2019est-ce que l\u2019indice ORAC?"},"content":{"rendered":"<p>L\u2019indice ORAC (<em>Oxygen Radical Absorbance Capacity,<\/em>\u00a0signifiant capacit\u00e9 d&#8217;absorption des radicaux oxyg\u00e9n\u00e9s) est une analyse en laboratoire qui fournit une mesure globale de l\u2019activit\u00e9 antioxydante des aliments. Cet examen met l\u2019aliment en question en pr\u00e9sence d\u2019un agent oxydant et mesure la capacit\u00e9 de r\u00e9sistance \u00e0 l\u2019oxydation de cet aliment. Plus le score ORAC est \u00e9lev\u00e9, plus la capacit\u00e9 antioxydante de l\u2019aliment est importante. Plusieurs m\u00e9thodes de mesure de la capacit\u00e9 antioxydante \u00ab\u00a0globale\u00a0\u00bb ont \u00e9t\u00e9 d\u00e9velopp\u00e9es. Aucune n\u2019est irr\u00e9futable, mais l\u2019indice ORAC est le plus largement accept\u00e9 dans les milieux commerciaux.<\/p>\n<p>Les tests ORAC sont souvent utilis\u00e9s pour comparer l\u2019activit\u00e9 antioxydante de divers aliments (fruits, l\u00e9gumes, jus, vins, ectc.). Ces comparaisons peuvent \u00eatre utiles, mais elles ont certaines limites. Premi\u00e8rement, les analyses ORAC ne sont pas tr\u00e8s pr\u00e9cises. Quand un aliment est test\u00e9 plusieurs fois dans un m\u00eame laboratoire, les variations de score suivant les \u00e9chantillons test\u00e9s sont souvent de l\u2019ordre de 10 \u00e0 15 %. Deuxi\u00e8mement, les laboratoires effectuent ces tests de mani\u00e8re diff\u00e9rente, et obtiennent souvent des r\u00e9sultats tr\u00e8s diff\u00e9rents. Troisi\u00e8mement, pour prendre un exemple, des jus d\u2019orange diff\u00e9rents, produits et dilu\u00e9s de mani\u00e8re diff\u00e9rente et conserv\u00e9s dans des conditions diff\u00e9rentes, peuvent avoir des activit\u00e9s antioxydantes tr\u00e8s diff\u00e9rentes, ce qui rend difficile l\u2019attribution d\u2019un score ORAC probant pour le jus d\u2019orange en g\u00e9n\u00e9ral.<\/p>\n<p>Cependant, les comparaisons bas\u00e9es sur les tests ORAC peuvent \u00eatre valables lorsque des produits semblables sont test\u00e9s, que les analyses ORAC sont effectu\u00e9es par un seul laboratoire habilit\u00e9, avec les m\u00eames m\u00e9thodes d\u2019analyse, et surtout, que les scores ORAC d\u00e9clar\u00e9s portent sur des quantit\u00e9s \u00e9gales de produit (par exemple, toutes les valeurs ORAC sont pr\u00e9sent\u00e9es pour une once ou pour 100 grammes). Dans ces conditions, des grandes diff\u00e9rences dans le score ORAC (surtout si elles sont de l\u2019ordre du triple au d\u00e9cuple) peuvent indiquer des diff\u00e9rences d\u00e9cisives dans l\u2019activit\u00e9 antioxydante v\u00e9ritable.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019indice ORAC (Oxygen Radical Absorbance Capacity,\u00a0signifiant capacit\u00e9 d&#8217;absorption des radicaux oxyg\u00e9n\u00e9s) est une analyse en laboratoire qui fournit une mesure globale de l\u2019activit\u00e9 antioxydante des aliments. Cet examen met l\u2019aliment en question en pr\u00e9sence d\u2019un agent oxydant et mesure la capacit\u00e9 de r\u00e9sistance \u00e0 l\u2019oxydation de cet aliment. Plus le score ORAC est \u00e9lev\u00e9, plus [&hellip;]<\/p>\n","protected":false},"author":10897,"featured_media":0,"menu_order":0,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"qa-category":[],"qa-tag":[],"class_list":["post-2010","qa","type-qa","status-publish","format-standard","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu\u2019est-ce que l\u2019indice ORAC? - Ask The Scientists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/askthescientists.com\/fr\/qa\/quest-ce-que-lindice-orac\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu\u2019est-ce que l\u2019indice ORAC? - Ask The Scientists\" \/>\n<meta property=\"og:description\" content=\"L\u2019indice ORAC (Oxygen Radical Absorbance Capacity,\u00a0signifiant capacit\u00e9 d&#8217;absorption des radicaux oxyg\u00e9n\u00e9s) est une analyse en laboratoire qui fournit une mesure globale de l\u2019activit\u00e9 antioxydante des aliments. 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