{"id":18,"date":"2020-11-19T14:35:23","date_gmt":"2020-11-19T14:35:23","guid":{"rendered":"https:\/\/superoxide-dismutase.eu\/?p=18"},"modified":"2021-01-04T14:23:14","modified_gmt":"2021-01-04T14:23:14","slug":"dpph-method","status":"publish","type":"post","link":"https:\/\/superoxide-dismutase.eu\/fr\/methode-dpph\/","title":{"rendered":"M\u00e9thode DPPH"},"content":{"rendered":"<h2><b>DOMMAGES CELLULAIRES ET ROS<\/b><\/h2>\n<p>Les dommages cellulaires sont induits par les esp\u00e8ces \u00e0 oxyg\u00e8ne r\u00e9actif (ROS). Les ROS sont des radicaux libres, des anions r\u00e9actifs contenant des atomes d'oxyg\u00e8ne ou des mol\u00e9cules contenant de l'oxyg\u00e8ne capables de g\u00e9n\u00e9rer des radicaux libres. Le radical hydroxyle, le superoxyde et le peroxyde d'hydrog\u00e8ne en sont des exemples.<\/p>\n<p>La principale source de ROS in vivo est la respiration a\u00e9robie, mais les ROS sont \u00e9galement produits lors de la b\u00eata-oxydation des acides gras, dans le m\u00e9tabolisme des compos\u00e9s x\u00e9nobiotiques par le cytochrome P450, dans la stimulation de la phagocytose des agents pathog\u00e8nes ou des lipopolysaccharides, etc. Les ROS et le stress oxydatif en g\u00e9n\u00e9ral sont impliqu\u00e9s dans certaines maladies chroniques telles que la maladie d'Alzheimer et de Parkinson, le cancer et le vieillissement.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-1534 size-full\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png\" alt=\"\" width=\"576\" height=\"199\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png 576w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-300x104.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-16x6.png 16w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/p>\n<p><img decoding=\"async\" class=\"wp-image-1025 size-full aligncenter\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png\" alt=\"\" width=\"576\" height=\"199\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png 576w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-300x104.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-16x6.png 16w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-1023 size-full\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png\" alt=\"\" width=\"576\" height=\"199\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species.png 576w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-300x104.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Oxigen-and-other-Reactive-Oxygen-Species-16x6.png 16w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/p>\n<h2><b>LE RADICAL SUPEROXYDE<\/b><\/h2>\n<p>En partant d'une mol\u00e9cule d'O2 et en ajoutant un \u00e9lectron \u00e0 l'orbite externe, on obtient le produit de r\u00e9duction de l'oxyg\u00e8ne mol\u00e9culaire : l'anion superoxyde (O2.- ). Il est produit lors de la phosphorylation oxydative, par des enzymes (c'est-\u00e0-dire la xanthine oxydase) et des leucocytes. En raison de sa toxicit\u00e9, tous les organismes a\u00e9robies ont d\u00e9velopp\u00e9 diff\u00e9rentes isoformes de l'enzyme antagoniste : la superoxyde dismutase (SOD). La SOD est une enzyme tr\u00e8s efficace, capable de combiner l'anion superoxyde avec deux H+, catalysant la r\u00e9action de dismutation par l'interm\u00e9diaire d'un cofacteur \u00e0 base de m\u00e9tal, ce qui donne H2O2 et O2 comme produits finaux. S'il n'est pas correctement et rapidement inactiv\u00e9, l'anion superoxyde peut endommager les lipides, les prot\u00e9ines et l'ADN des membranes.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1535 aligncenter\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1.png\" alt=\"\" width=\"283\" height=\"205\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1.png 283w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1-16x12.png 16w\" sizes=\"(max-width: 283px) 100vw, 283px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1038 aligncenter\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1.png\" alt=\"\" width=\"283\" height=\"205\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1.png 283w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Superoxide-radical-1-16x12.png 16w\" sizes=\"(max-width: 283px) 100vw, 283px\" \/><\/p>\n<h2><b>L'INACTIVATION ENZYMATIQUE DU SUPEROXYDE <\/b><\/h2>\n<p>Dans des conditions normales, dans notre corps, les ROS sont inactiv\u00e9s par des enzymes telles que la superoxyde dismutase (SOD), la catalase (CAT) et la glutathion peroxydase (GPx). La SOD est une enzyme cl\u00e9 capable d'inactiver le radical superoxyde, l'une des esp\u00e8ces de radicaux les plus r\u00e9actives et donc les plus dangereuses.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1506 size-full\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-Superoxide-dismutase-117.jpeg\" alt=\"\" width=\"265\" height=\"190\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-Superoxide-dismutase-117.jpeg 265w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-Superoxide-dismutase-117-16x12.jpeg 16w\" sizes=\"(max-width: 265px) 100vw, 265px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1017 aligncenter\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/ENZYMATIC-INACTIVATION-OF-THE-SUPEROXIDE-300x209-1.png\" alt=\"\" width=\"300\" height=\"209\" \/><\/p>\n<h2><b>LE SUPEROXYDE DISMUTASE ENZIME <\/b><\/h2>\n<p>Pour r\u00e9duire les effets nocifs des ROS, les cellules ont d\u00e9velopp\u00e9 diff\u00e9rentes strat\u00e9gies de d\u00e9fense, y compris des syst\u00e8mes enzymatiques et non enzymatiques. En ce qui concerne les enzymes antioxydantes, certaines d'entre elles jouent un r\u00f4le pr\u00e9ventif en \u00e9liminant directement les ROS. Parmi ces enzymes, la superoxyde dismutase est la premi\u00e8re ligne de d\u00e9fense qui \u00e9limine l'anion superoxyde, le premier et le plus r\u00e9actif des radicaux d\u00e9riv\u00e9s de l'oxyg\u00e8ne mol\u00e9culaire. La SOD est donc l'un des principaux syst\u00e8mes de d\u00e9fense antioxydants pr\u00e9sents dans presque toutes les cellules expos\u00e9es \u00e0 l'oxyg\u00e8ne. La r\u00e9action catalys\u00e9e par la SOD est une dismutation avec une cin\u00e9tique de second ordre bas\u00e9e sur les demi-r\u00e9actions suivantes :<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2><b>M\u00e9thode DPPH <\/b><\/h2>\n<p>La capacit\u00e9 antiradicalaire a \u00e9t\u00e9 \u00e9valu\u00e9e \u00e0 l'aide de la m\u00e9thode DPPH. L'\u00e9chantillon est plac\u00e9 dans une solution concentr\u00e9e d'un radical libre standard (1,1-diph\u00e9nyl-2-picryl-hydrazyl) et sa concentration est mesur\u00e9e par spectrophotom\u00e9trie pour \u00e9valuer la capacit\u00e9 du phytocomplexe \u00e0 \u00e9teindre les radicaux. Le Superox-D a une capacit\u00e9 antiradicalaire \u00e9lev\u00e9e gr\u00e2ce \u00e0 des m\u00e9canismes d'extinction.<\/p>\n<p>16 fois plus anti-radicalaire que le melon<\/p>\n<p>37 fois plus antiradicalaire que le SOD du melon<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1537 aligncenter\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1.png\" alt=\"\" width=\"300\" height=\"155\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1-16x8.png 16w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1029\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1.png\" alt=\"\" width=\"300\" height=\"155\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/Structure-of-the-radical-DPPH-300x155-1-16x8.png 16w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1536 aligncenter\" style=\"font-weight: inherit;\" src=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-DPPH-Method.png\" alt=\"\" width=\"300\" height=\"177\" srcset=\"https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-DPPH-Method.png 300w, https:\/\/superoxide-dismutase.eu\/wp-content\/uploads\/SOD-DPPH-Method-16x9.png 16w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h3><b>R\u00c9F\u00c9RENCES<\/b><\/h3>\n<p>Doddigarla Z Corr\u00e9lation des taux s\u00e9riques de chrome, zinc, magn\u00e9sium et SOD avec l'HbA1c dans le diab\u00e8te de type 2 : Une analyse transversale. Syndrome m\u00e9tabolique du diab\u00e8te. 2016 janv-Mar;10(1 Suppl 1):S126-9. doi : 10.1.<\/p>\n<p>Vouldoukis I, Conti M, Krauss P, et al. Une suppl\u00e9mentation en extrait de superoxyde dismutase v\u00e9g\u00e9tale combin\u00e9e \u00e0 la gliadine favorise les d\u00e9fenses antioxydantes et prot\u00e8ge contre le stress oxydatif. Phytother Res. 2004 Dec;18(12):957-62.<\/p>\n<p>Vouldoukis I, Lacan D, Kamate C, et al. Propri\u00e9t\u00e9s antioxydantes et anti-inflammatoires d'un extrait de Cucumis melo LC. riche en activit\u00e9 superoxyde dismutase. J Ethnopharmacol. 2004 Sep;94(1):67-75.<\/p>\n<p>Muth CM, Glenz Y, Klaus M, et al. Influence of an orally effective SOD on hyperbaric oxygen-related cell damage. Free Radic Res. 2004 Sep;38(9):927-32.<\/p>\n<p>Barouki R. Vieillissement des radicaux libres et stress cellulaire. Med Sci (Paris). 2006 Mar;22(3):266-72.<\/p>\n<p>Faraci FM, Didion SP. Protection vasculaire : isoformes de superoxyde dismutase dans la paroi des vaisseaux. Arterioscler Thromb Vasc Biol. 2004 Aug;24(8):1367-73.<\/p>\n<p>Fukai T, Folz RJ, Landmesser U, Harrison DG. Superoxyde dismutase extracellulaire et maladies cardiovasculaires. Cardiovasc Res. 2002 Aug 1;55(2):239-49.<\/p>\n<p>Petersen SV, Oury TD, Ostergaard L, et al. La superoxyde dismutase extracellulaire (EC-SOD) se lie au collag\u00e8ne de type i et prot\u00e8ge contre la fragmentation oxydative. J Biol Chem. 2004 Apr 2;279(14):13705-10.<\/p>\n<p>Maier CM, Chan PH. R\u00f4le des superoxydes dismutases dans les dommages oxydatifs et les troubles neurod\u00e9g\u00e9n\u00e9ratifs. Neuroscientifique. 2002 Aug;8(4):323-34.<\/p>\n<p>Fattman CL, Schaefer LM, Oury TD. La superoxyde dismutase extracellulaire en biologie et en m\u00e9decine. Free Radic Biol Med. 2003 Aug 1;35(3):236-56.<\/p>\n<p>Chung JM. Le r\u00f4le des esp\u00e8ces r\u00e9actives de l'oxyg\u00e8ne (ROS) dans la douleur persistante. Mol Interv. 2004 Oct;4(5):248-50.<\/p>\n<p>Bae SC, Kim SJ, Sung MK. Apport insuffisant de nutriments antioxydants et alt\u00e9ration du statut antioxydant du plasma des patients atteints de polyarthrite rhumato\u00efde. J Am Coll Nutr. 2003 Aug;22(4):311-5.<\/p>\n<p>Zawadzka-Bartczak E. Activit\u00e9s des enzymes antioxydantes des globules rouges (SOD, GPx) et capacit\u00e9 antioxydante totale du s\u00e9rum (TAS) chez les hommes atteints d'ath\u00e9roscl\u00e9rose coronaire et chez les pilotes sains. Med Sci Monit. 2005 Sep;11(9):CR440-4.<\/p>\n<p>Gow A, Ischiropoulos H. Super-SOD : la chim\u00e8re superoxyde dismutase combat l'inflammation. Am J Physiol Lung Cell Mol Physiol. 2003 Jun;284(6):L915-6.<\/p>\n<p>Flohe L. Superoxyde dismutase \u00e0 usage th\u00e9rapeutique : exp\u00e9rience clinique, impasses et espoirs. Mol Cell Biochem. 1988 Dec;84(2):123-31.<\/p>\n<p>Carlo MD, Jr., Loeser RF. L'augmentation du stress oxydatif avec le vieillissement r\u00e9duit la survie des chondrocytes : corr\u00e9lation avec les niveaux de glutathion intracellulaire. Arthrite rhumato\u00efde. 2003 Dec;48(12):3419-30.<\/p>\n<p>Junqueira VB, Barros SB, Chan SS, et al. Vieillissement et stress oxydatif. Mol Aspects Med. 2004 Feb;25(1-2):5-16.<\/p>\n<p>Vina J, Lloret A, Orti R, Alonso D. Molecular bases of the treatment of Alzheimer's disease with antioxidants : prevention of oxidative stress. Mol Aspects Med. 2004 Feb;25(1-2):117-23.<\/p>\n<p>Okada F, Shionoya H, Kobayashi M, et al. Prevention of inflammation-mediated acquisition of metastatic properties of benign mouse fibrosarcoma cells by administration of an orally available SOD. Br J Cancer. 2006 Mar 27;94(6):854-62.<\/p>\n<p>Benedetti S, Lamorgese A, Piersantelli M, Pagliarani S, Benvenuti F, Canestrari F. Stress oxydatif et statut antioxydant chez les patients subissant une exposition prolong\u00e9e \u00e0 l'oxyg\u00e8ne hyperbare. Clin Biochem. 2004 Apr;37(4):312-7.<\/p>\n<p>Dennog C, Radermacher P, Barnett YA, Speit G. \u00c9tat des antioxydants chez l'homme apr\u00e8s exposition \u00e0 l'oxyg\u00e8ne hyperbare. Mutat Res. 1999 Jul 16;428(1-2):83-9.<\/p>\n<p>Levin ED. La superoxyde dismutase extracellulaire (EC-SOD) \u00e9teint les radicaux libres et att\u00e9nue le d\u00e9clin cognitif li\u00e9 \u00e0 l'\u00e2ge : opportunit\u00e9s pour le d\u00e9veloppement de nouveaux m\u00e9dicaments dans le domaine du vieillissement. Curr Alzheimer Res. 2005 Apr;2(2):191-6. R<\/p>","protected":false},"excerpt":{"rendered":"<p>CELL DAMAGES AND ROS Cell damages are induced by Reactive Oxygen Species (ROS). ROS are free radicals, reactive anions containing oxygen atoms or\u00a0oxygen containing molecules able to generate free radicals. Some examples are hydroxyl radical, superoxide and hydrogen peroxide. Main source of ROS in vivo is aerobic respiration, but ROS are also produced during beta-oxidation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1494,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","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":"","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":[30],"tags":[],"class_list":["post-18","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DPPH Method - Superoxide Dismutase<\/title>\n<meta name=\"description\" content=\"Cell damages are induced by Reactive Oxygen Species (ROS). 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