{"id":58635,"date":"2022-04-29T07:59:17","date_gmt":"2022-04-29T05:59:17","guid":{"rendered":"https:\/\/www.bioecoactual.com\/?p=58635"},"modified":"2022-04-29T09:10:20","modified_gmt":"2022-04-29T07:10:20","slug":"polifenols-antioxidants-mes-abundants-natura","status":"publish","type":"post","link":"https:\/\/www.bioecoactual.com\/ca\/2022\/04\/29\/polifenols-antioxidants-mes-abundants-natura\/","title":{"rendered":"Polifenols: els antioxidants m\u00e9s abundants de la natura"},"content":{"rendered":"<p>Els <strong>polifenols<\/strong> es troben \u00e0mpliament distribu\u00efts en plantes, flors i fruits. S\u00f3n els <strong>antioxidants<\/strong> m\u00e9s abundants de la natura. Malgrat aix\u00f2, les seves propietats antiox, el seu poder per eliminar els radicals lliures, no s&#8217;han comen\u00e7at a estudiar fins fa poc.<!--more--><\/p>\n<figure id=\"attachment_58626\" aria-describedby=\"caption-attachment-58626\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-58626\" src=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles.jpg\" alt=\"polifenoles\" width=\"1000\" height=\"667\" srcset=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles.jpg 1000w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-768x512.jpg 768w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-696x464.jpg 696w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-630x420.jpg 630w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-58626\" class=\"wp-caption-text\">123rf Limited\u00a9pstedrak. Les cireres ajuden a regular el colesterol<\/figcaption><\/figure>\n<h2>Caracter\u00edstiques principals<\/h2>\n<p>A difer\u00e8ncia de les vitamines antioxidants, dels minerals i els carotenoides, els polifenols van ser considerats mol\u00e8cules sense propietats antioxidants fins a mitjans dels anys 90. A mesura que s&#8217;ha anat coneixent amb m\u00e9s profunditat l&#8217;activitat que duen a terme els radicals lliures i les esp\u00e8cies reactives d&#8217;oxigen i nitrogen, el complex proc\u00e9s biol\u00f2gic de l&#8217;estr\u00e8s oxidatiu i l&#8217;evid\u00e8ncia de la seva relaci\u00f3 amb les malalties cr\u00f2niques, s&#8217;ha accentuat l&#8217;important paper que juguen els polifenols com mol\u00e8cules bioactives i la seva valuosa funci\u00f3 en la millora de la salut i reducci\u00f3 de les malalties.<\/p>\n<blockquote><p>Presents en plantes, flors i fruits, els polifenols s\u00f3n els antioxidants m\u00e9s abundants de la naturalesa<\/p><\/blockquote>\n<p>Els polifenols s\u00f3n un conjunt de subst\u00e0ncies fitoqu\u00edmiques que es caracteritzen per presentar m\u00e9s d&#8217;un grup fenol per mol\u00e8cula, \u00e9s a dir, diversos grups hidroxil en anells arom\u00e0tics. Tots els compostos fen\u00f2lics sorgeixen d&#8217;un intermediari com\u00fa, la fenilalanina. Presenten una estructura qu\u00edmica complexa i una considerable diversitat. S&#8217;han identificat <strong>m\u00e9s de 8.000 tipus de polifenols<\/strong>, que es classifiquen en quatre grups principals en funci\u00f3 del nombre d&#8217;anells fen\u00f2lics que contenen i dels elements estructurals que uneixen aquests anells entre si. Tenim els <strong>flavonoides, els \u00e0cids fen\u00f2lics, les amides fen\u00f2liques i un grup de polifenols que inclou a estilbens i lignans<\/strong>.<\/p>\n<h3>Els flavonoides<\/h3>\n<p>Els <strong>flavonoides<\/strong> agrupen el 60% de tots els polifenols. S\u00f3n els responsables de l&#8217;atractiu color de les flors, fruits i fulles. \u00c9s el grup de polifenols m\u00e9s estudiat i es divideix en sis classes principals: els flavonols, els flavanols, les flavones, les flavonones, les antocianidines i les isoflavones. Els principals flavonols s\u00f3n la quercetina i el kaempferol, i es troben en aliments com <strong>el br\u00f2quil, pomes, cebes, xocolata amarga, col llombarda, vi negre, te i ginkgo<\/strong>. Entre els flavanols destaquen les catequines, que es troben principalment en les fulles de <strong>te verd, pomes, peres, fruits vermells, cacau i xocolata<\/strong>. Les flavones, representades per l&#8217;apigenina i la luteolina, s\u00f3n abundants en<strong> les fruites i verdures de color p\u00farpura, en farigola i camamilla<\/strong>. Les flavonones, com la naringenina i hesperidina, es troba en <strong>aranja, taronja, pell de tom\u00e0quet i farigola<\/strong>, mentre que la naringina, est\u00e0 en la <strong>pell d&#8217;aranja i taronger amarg<\/strong>, sent responsable del seu sabor amarg. Les antocianidines s\u00f3n un gran grup de pigments que es troben en fruites i verdures amb tonalitats fosques o viol\u00e0cies, com la <strong>col llombarda, la pastanaga morada, la col morat i els raves, l&#8217;arr\u00f2s vermell, mongetes negres, ceba morada, enciam roure, tom\u00e0quets morats i negres<\/strong>. En les maduixes, nabius, granades, ra\u00efm, pomes i cacau. Les isoflavones, com la geniste\u00efna, daidze\u00efna i gliciteina s\u00f3n fitoestr\u00f2gens naturals que es localitzen en plantes, fruites, herbes i verdures, sent abundants en la<strong> soja, cireres, taronges, ra\u00efm, te verd i negre<\/strong>.<\/p>\n<blockquote><p>El benefici dels flavonoides es deu a la seva \u00e0mplia activitat biol\u00f2gica<\/p><\/blockquote>\n<p>El <strong>benefici<\/strong> dels flavonoides es deu a la seva \u00e0mplia activitat biol\u00f2gica. Estableixen complexos amb enzims i hormones. Modulen l&#8217;activitat de diferents enzims. S\u00f3n poderosos antioxidants que s&#8217;uneixen i eliminen radicals lliures. La seva acci\u00f3 antiox protegeix enfront de la diabetis, c\u00e0ncer, cardiopaties i inflamacions. Tenen activitat antiinflamat\u00f2ria, antitromb\u00f2tica, antiviral i antial\u00b7l\u00e8rgica. S\u00f3n moduladors en els processos de carcinog\u00e8nesi, amb efectes demostrats antimutag\u00e8nics i anticarcinog\u00e8nics, amb paper d&#8217;agent preventiu, activitat antiproliferativa i efecte inhibidor de les c\u00e8l\u00b7lules canceroses. Protegeixen enfront de malalties neurodegeneratives com l&#8217;Alzheimer i la malaltia de Parkinson.<\/p>\n<figure id=\"attachment_58629\" aria-describedby=\"caption-attachment-58629\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-58629\" src=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-antioxidantes.jpg\" alt=\"polifenoles\" width=\"1000\" height=\"667\" srcset=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-antioxidantes.jpg 1000w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-antioxidantes-768x512.jpg 768w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-antioxidantes-696x464.jpg 696w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/04\/polifenoles-antioxidantes-630x420.jpg 630w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-58629\" class=\"wp-caption-text\">123rf Limited\u00a9shaiith. Nabius i maduixes ajuden a controlar la diabetis mellitus tipus 2<\/figcaption><\/figure>\n<h4>\u00c0cids fen\u00f2lics<\/h4>\n<p>Els <strong>\u00e0cids fen\u00f2lics<\/strong> engloben el 30% dels polifenols. Formen un grup divers que es divideix en dues classes segons el seu origen: els derivats de l&#8217;\u00e0cid benzoic i derivats de l&#8217;\u00e0cid cin\u00e0mic. Inclou l&#8217;\u00e0cid cafeic, l&#8217;\u00e0cid cum\u00e0ric, els \u00e0cids hidroxibenzoic i hidroxicin\u00e0mic i l&#8217;\u00e0cid el\u00e0gic. Els trobem en <strong>fruits vermells, com magranes, maduixes, gerds, nabius, mores, en el rave negre, tom\u00e0quets, pastanagues i all, en fruits secs com nous i castanyes, a kiwis, ra\u00efm i vi<\/strong>.<\/p>\n<p>Els \u00e0cids fen\u00f2lics enforteixen el sistema immune i protegeixen les c\u00e8l\u00b7lules enfront de processos carcinog\u00e8nics. Tenen activitat preventiva, antiproliferativa i inhibidora en el creixement de les c\u00e8l\u00b7lules canceroses. Protegeixen de les malalties card\u00edaques, les prevenen i ajuden a tractar-les.<\/p>\n<blockquote><p>Els \u00e0cids fen\u00f2lics enforteixen el sistema immune i protegeixen les c\u00e8l\u00b7lules enfront de processos carcinog\u00e8nics<\/p><\/blockquote>\n<h4>Amides polifen\u00f2liques<\/h4>\n<p>Les <strong>amides polifen\u00f2liques<\/strong> inclouen capsaicinoides dels xilis i avenantramides de la civada. Tenen acci\u00f3 antioxidant, antiinflamat\u00f2ria i antiateroscler\u00f2tica, sent \u00fatils sobre malalties inflamat\u00f2ries, al\u00b7l\u00e8rgiques o cardiovasculars.<\/p>\n<h4>Estilbens i lignans<\/h4>\n<p>El grup dels <strong>estilbens i lignans<\/strong> es troben en fruites, verdures, cereals integrals i llavors. El estilb\u00e8 natural m\u00e9s estudiat \u00e9s el resveratrol que es localitza principalment en <strong>el ra\u00efm i el vi, en nous i cacauets, a fruits vermells i el cacau<\/strong>. Els lignans s\u00f3n abundants en <strong>llavors de lli i en cereals integrals, com el s\u00e8gol, la civada, l&#8217;ordi i el blat<\/strong>. Tamb\u00e9 s\u00f3n riques en lignans les <strong>llavors de carbassa, de s\u00e8sam, gira-sol i rosella<\/strong>.<\/p>\n<p>El <strong>resveratrol<\/strong> t\u00e9 efecte protector cardiovascular, antiagregant plaquetari, antiinflamatori, antial\u00b7l\u00e8rgic i anticancerigen. \u00c9s una mol\u00e8cula antienvelliment. Els lignans, per la seva banda, tenen propietats antioxidants, antitumorals i antiinflamat\u00f2ries. S\u00f3n fitoestr\u00f2gens naturals molt efica\u00e7os en la menopausa. Tenen acci\u00f3 davant del c\u00e0ncer de mama, esof\u00e0gic, de c\u00f2lon i patologies del sistema cardiovascular.<\/p>\n<p><strong>Autor:<\/strong>\u00a0Ra\u00fal Mart\u00ednez, Dietista-nutricionista, bi\u00f2leg<\/p>\n<p><a href=\"https:\/\/www.bioecoactual.com\/ca\/subscripcio\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Subscriu-te<\/strong><\/a><strong> a la Newsletter i rep cada mes Bio Eco Actual gratis al teu correu<\/strong><\/p>\n<p><strong><em>Bio Eco Actual<\/em>, <em>el teu mensual 100% ecol\u00f2gic<\/em><br \/>\nLlegir <\/strong><a href=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2022\/03\/BioEcoActual_Abril_Catala_2022.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Bio Eco Actual Abril 2022<\/strong><\/a><\/p>\n<p><iframe style=\"border: none; width: 100%; height: 520px;\" src=\"\/\/e.issuu.com\/embed.html?d=bioecoactual_abril_catala_2022&amp;hideIssuuLogo=true&amp;showOtherPublicationsAsSuggestions=true&amp;u=bioecoactual\" allowfullscreen=\"allowfullscreen\"> <\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Els polifenols es troben &agrave;mpliament distribu&iuml;ts en plantes, flors i fruits. S&oacute;n els antioxidants m&eacute;s abundants de la natura. Malgrat aix&ograve;, les seves propietats antiox, el seu poder per eliminar els radicals lliures, no s&rsquo;han comen&ccedil;at a estudiar fins fa poc.<\/p>\n","protected":false},"author":419,"featured_media":58627,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7166],"tags":[],"class_list":["post-58635","post","type-post","status-publish","format-standard","has-post-thumbnail","category-nutricio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Polifenols: els antioxidants m\u00e9s abundants de la natura - Bio Eco Actual<\/title>\n<meta name=\"description\" content=\"Estan presents en plantes, flors i fruits. 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