{"id":38255,"date":"2012-06-06T10:35:00","date_gmt":"2012-06-06T10:35:00","guid":{"rendered":"https:\/\/matis.is\/?p=38255"},"modified":"2021-10-21T11:00:20","modified_gmt":"2021-10-21T11:00:20","slug":"antioxidant-capacities-of-phlorotannins-extracted-from-the-brown-algae-fucus-vesiculosus","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/greinar\/antioxidant-capacities-of-phlorotannins-extracted-from-the-brown-algae-fucus-vesiculosus\/","title":{"rendered":"Antioxidant Capacities of Phlorotannins Extracted from the brown algae Fucus vesiculosus"},"content":{"rendered":"<p>A process for the effective extraction and fractionation of phlorotannins from&nbsp;<em>Fucus vesiculosus<\/em>&nbsp;with high antioxidant potentials was investigated. The antioxidant activity of&nbsp;<em>F. vesiculosus<\/em>&nbsp;extract \/ fractions was assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging, reducing power, and ferrous ion-chelating assays. Among the crude extract and different polarity fractions, the phlorotannin-enriched ethyl acetate fraction possessed the highest DPPH scavenging activity and reducing power. This fraction was further fractionated by Sephadex LH-20 column chromatography or ultrafiltration. The antioxidant properties were evaluated by both the above chemical antioxidant tests and a mononuclear cell-based bioassay. Sephadex subfractions LH-2 and LH-3 with high total phlorotannin content exhibited strong DPPH quenching activity, comparable to those of ascorbic acid and butylated hydroxytoluene and significantly higher than that of \u03b1-tocopherol. Polyphenols in&nbsp;<em>F. vesiculosus<\/em>&nbsp;were found to consist mainly of high molecular weight phlorotannin polymers. There were no clear relationships between the degree of polymerization, molecular size, and antioxidant activity. All the subfractions separated by Sephadex LH-20 column chromatography and ultrafiltration showed a high ability to scavenge reactive oxygen species generated by mononuclear cells. Further characterization of the phlorotannin compounds was performed on six Sephadex subfractions. Several phlorotannin oligomers were tentatively identified on the basis of HPLC \u2013 ESI-MS<em><sup>n<\/sup><\/em>&nbsp;analyzes.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/jf3003653\">Link to article<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>A process for the effective extraction and fractionation of phlorotannins from&nbsp;Fucus vesiculosus&nbsp;with high antioxidant potentials was investigated. The antioxidant activity [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"template-greinar.php","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","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":"","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-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[2011],"tags":[],"class_list":["post-38255","post","type-post","status-publish","format-standard","hentry","category-greinar"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Antioxidant Capacities of Phlorotannins Extracted from the brown algae\u00a0Fucus vesiculosus - Mat\u00eds<\/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:\/\/matis.is\/en\/greinar\/antioxidant-capacities-of-phlorotannins-extracted-from-the-brown-algae-fucus-vesiculosus\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Antioxidant Capacities of Phlorotannins Extracted from the brown algae\u00a0Fucus vesiculosus - Mat\u00eds\" \/>\n<meta property=\"og:description\" content=\"A process for the effective extraction and fractionation of phlorotannins from&nbsp;Fucus vesiculosus&nbsp;with high antioxidant potentials was investigated. 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