{"id":6263,"date":"2022-08-05T23:05:36","date_gmt":"2022-08-06T07:05:36","guid":{"rendered":"https:\/\/www.ecoteapro.com\/?p=6263"},"modified":"2022-10-29T18:02:19","modified_gmt":"2022-10-30T02:02:19","slug":"tea-antioxidant-activity-summary","status":"publish","type":"post","link":"https:\/\/www.ecoteapro.com\/fr\/tea-antioxidant-activity-summary\/","title":{"rendered":"R\u00e9sum\u00e9 de l'activit\u00e9 antioxydante du th\u00e9"},"content":{"rendered":"
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R\u00e9sum\u00e9 de l'activit\u00e9 antioxydante du th\u00e9<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Le contenu du th\u00e9 contient de l'eau (75%) et de la mati\u00e8re s\u00e8che (25%) ; la mati\u00e8re s\u00e8che contient des produits chimiques inorganiques (3.5%-7%) et des produits chimiques organiques (93%-96%) ; les produits chimiques inorganiques contiennent des produits chimiques solubles dans l'eau (2%-4%) et des produits chimiques insolubles dans l'eau (1.5%-3%) ; les produits chimiques organiques contiennent des compos\u00e9s N{acide amin\u00e9(1-7%), prot\u00e9ine(20-30%), alcalo\u00efde(2-5%), enzyme} et des compos\u00e9s C{polyph\u00e9nol de th\u00e9 (20-35%), (matte aromatique (0.02%), ester(8%), acides organiques(3%), pigments(1%), vitamine(0.6-1%)}.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Dans les feuilles de th\u00e9, la teneur en cat\u00e9chine est de 12% \u00e0 24% de mati\u00e8re s\u00e8che, la teneur en cat\u00e9chine dans les polyph\u00e9nols du th\u00e9 comptant jusqu'\u00e0 environ 70% du total, dont l'\u00e9pigallocat\u00e9chine (EGC), le gallate d'\u00e9pigallocat\u00e9chine EGCG, et comptant jusqu'\u00e0 environ 50% du total des cat\u00e9chines.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Les polyph\u00e9nols du th\u00e9 (TP), \u00e9galement appel\u00e9s tanins du th\u00e9, sont un terme g\u00e9n\u00e9rique d\u00e9signant les compos\u00e9s ph\u00e9noliques du th\u00e9, notamment les flavono\u00efdes (cat\u00e9chines), les anthocyanes (anthocyanines et leucoanthocyanidine). Les flavono\u00efdes, les flavonols, les acides ph\u00e9noliques et les Depsides, etc. C'est l'un des composants importants qui font la qualit\u00e9 du th\u00e9, et c'est le composant le plus important, le plus essentiel et le plus b\u00e9n\u00e9fique pour le corps humain extrait du th\u00e9. Son principal composant est constitu\u00e9 de d\u00e9riv\u00e9s de flavan-3-ol, commun\u00e9ment appel\u00e9s cat\u00e9chines. \u00c0 l'exception des ph\u00e9nols et des ph\u00e9nols condens\u00e9s, leurs structures ont toutes un squelette carbon\u00e9 de base C6-C3-C6 avec l'a-ph\u00e9nylbenzodihydropyrane (flavan) comme corps principal.Selon la structure chimique, on peut les diviser en quatre cat\u00e9gories : gallate d'\u00e9pigallocat\u00e9chine (EGCG), \u00e9pigallocat\u00e9chine (EGC), gallate d'\u00e9picat\u00e9chine (ECG) et \u00e9picat\u00e9chine (EC), plus stables \u00e0 pH 4-8, acides, alcalins, lumi\u00e8re, chaleur, m\u00e9taux de transition sujets \u00e0 la d\u00e9t\u00e9rioration des polyph\u00e9nols.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Type<\/div><\/div><\/div><\/th>
TP40<\/div><\/div><\/div><\/th>
TP50<\/div><\/div><\/div><\/th>
TP80<\/div><\/div><\/div><\/th>
TP90<\/div><\/div><\/div><\/th>
TP95<\/div><\/div><\/div><\/th>
TP98\/1<\/div><\/div><\/div><\/th>
TP98\/2<\/div><\/div><\/div><\/th><\/tr><\/thead>\n\t\t\t\t\t\t\t\t
Polyph\u00e9nols du th\u00e9<\/div><\/div><\/div><\/td>
40<\/div><\/div><\/div><\/td>
50<\/div><\/div><\/div><\/td>
80<\/div><\/div><\/div><\/td>
90<\/div><\/div><\/div><\/td>
95<\/div><\/div><\/div><\/td>
98<\/div><\/div><\/div><\/td>
98<\/div><\/div><\/div><\/td><\/tr>
Cat\u00e9chines<\/div><\/div><\/div><\/td>
25<\/div><\/div><\/div><\/td>
30<\/div><\/div><\/div><\/td>
60<\/div><\/div><\/div><\/td>
70<\/div><\/div><\/div><\/td>
75<\/div><\/div><\/div><\/td>
80<\/div><\/div><\/div><\/td>
80<\/div><\/div><\/div><\/td><\/tr>
Caf\u00e9ine<\/div><\/div><\/div><\/td>
10<\/div><\/div><\/div><\/td>
10<\/div><\/div><\/div><\/td>
10<\/div><\/div><\/div><\/td>
8<\/div><\/div><\/div><\/td>
5<\/div><\/div><\/div><\/td>
5<\/div><\/div><\/div><\/td>
0.5<\/div><\/div><\/div><\/td><\/tr>
EGCG<\/div><\/div><\/div><\/td>
30<\/div><\/div><\/div><\/td>
30<\/div><\/div><\/div><\/td>
40<\/div><\/div><\/div><\/td>
40<\/div><\/div><\/div><\/td>
45<\/div><\/div><\/div><\/td>
45<\/div><\/div><\/div><\/td>
50<\/div><\/div><\/div><\/td><\/tr><\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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L'activit\u00e9 antioxydante des polyph\u00e9nols du th\u00e9 est 4-6 fois sup\u00e9rieure \u00e0 celle de l'hydroxytolu\u00e8ne butyl\u00e9 (BHT), de l'hydroxyanisole butyl\u00e9 (BHA), est 6-7 fois sup\u00e9rieure \u00e0 celle du VE, 5-10 fois sup\u00e9rieure \u00e0 celle du VC, et sans les effets secondaires potentiels comme les compos\u00e9s.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Les antioxydants du th\u00e9 sont principalement le gallate d'\u00e9pigallocat\u00e9chine (EGCG), l'\u00e9pigallocat\u00e9chine (EGC), le gallate d'\u00e9picat\u00e9chine (ECG) et l'\u00e9picat\u00e9chine (EC), la caf\u00e9ine, les carot\u00e9no\u00efdes, la vitamine E, la vitamine C, l'acide gallique et l'acide chlorog\u00e9nique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Cat\u00e9chines, y compris les cat\u00e9chines non est\u00e9rifi\u00e9es et les cat\u00e9chines est\u00e9rifi\u00e9es. Cat\u00e9chines non est\u00e9rifi\u00e9es connues sous le nom de (+)-cat\u00e9chine (DL-C), (-)-\u00e9picat\u00e9chine (L-EC), (+)gallocat\u00e9chine (DL-GC) et (-)gallate d'\u00e9pigallocat\u00e9chine (L-EGC). Les cat\u00e9chines est\u00e9rifi\u00e9es connues sous le nom de gallate de (-)\u00e9picat\u00e9chine (L-ECG), et de gallate de (-)\u00e9pigallocat\u00e9chine-3 (L-EGCG). La teneur maximale en cat\u00e9chines dans le th\u00e9 est l'EGCG, suivie de l'ECG et de l'EGC.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Selon les recherches, les quatre types de cat\u00e9chines ayant une forte capacit\u00e9 antioxydante sont dans l'ordre EGCG>EGC>ECG>EC selon la concentration \u00e9quimolaire, et EGC>EGCG>EC>ECG selon la concentration \u00e9quimolaire. Les deux composants ayant la plus forte capacit\u00e9 d'oxydation sont l'EGCG et l'EGC.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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La s\u00e9quence de la capacit\u00e9 \u00e0 \u00e9liminer les radicaux libres de l'oxyg\u00e8ne : EGCG>ECG>EC>EGC. La CI50 de l'EGCG, de l'ECG, de l'EGC et de l'EC pour \u00e9liminer les radicaux libres lipidiques est de : 0,37, 0,46, 0,27 et 0,30 mmol\/L.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Selon la d\u00e9termination, dans les feuilles de th\u00e9 fra\u00eeches, le rapport approximatif de ces quatre cat\u00e9chines est EGCG : ECG : EGC : EC=5:2:2:1. Bien que la proportion d'EGCG pr\u00e9sente un avantage absolu, son effet synergique n'est pas aussi bon que celui de la combinaison naturelle. Ce r\u00e9sultat sugg\u00e8re que lorsque la cat\u00e9chine est utilis\u00e9e comme antioxydant, le maintien du ratio original de cat\u00e9chines a le meilleur effet antioxydant.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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La composition chimique du th\u00e9, du caf\u00e9 et du cacao est la suivante :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Ingr\u00e9dients<\/div><\/div><\/div><\/th>
Th\u00e9(%)<\/div><\/div><\/div><\/th>
Caf\u00e9(%)<\/div><\/div><\/div><\/th>
Cacao(%)<\/div><\/div><\/div><\/th><\/tr><\/thead>\n\t\t\t\t\t\t\t\t
Ingr\u00e9dients efficaces<\/div><\/div><\/div><\/td>
Polyph\u00e9nol de th\u00e9 :\n15-30<\/div><\/div><\/div><\/td>
Acide Chlorog\u00e9nique :\n8-10<\/div><\/div><\/div><\/td>
Ph\u00e9nols :\n10-15<\/div><\/div><\/div><\/td><\/tr>
Prot\u00e9ine<\/div><\/div><\/div><\/td>
20-35<\/div><\/div><\/div><\/td>
13-14<\/div><\/div><\/div><\/td>
13-14<\/div><\/div><\/div><\/td><\/tr>
Mati\u00e8res grasses brutes<\/div><\/div><\/div><\/td>
7-12<\/div><\/div><\/div><\/td>
13-15<\/div><\/div><\/div><\/td>
50-55<\/div><\/div><\/div><\/td><\/tr>
Amidon<\/div><\/div><\/div><\/td>
0.1-0.3<\/div><\/div><\/div><\/td>
11-12<\/div><\/div><\/div><\/td>
8.8-9.0<\/div><\/div><\/div><\/td><\/tr>
R\u00e9duire le sucre<\/div><\/div><\/div><\/td>
1.0-1.4<\/div><\/div><\/div><\/td>
1.0<\/div><\/div><\/div><\/td>
3.1<\/div><\/div><\/div><\/td><\/tr>
Fibres brutes<\/div><\/div><\/div><\/td>
10-25<\/div><\/div><\/div><\/td>
18<\/div><\/div><\/div><\/td>
3-5<\/div><\/div><\/div><\/td><\/tr>
Contenu en cendres<\/div><\/div><\/div><\/td>
5-6<\/div><\/div><\/div><\/td>
3-4<\/div><\/div><\/div><\/td>
2-3<\/div><\/div><\/div><\/td><\/tr>
Caf\u00e9ine<\/div><\/div><\/div><\/td>
2-4<\/div><\/div><\/div><\/td>
1-2<\/div><\/div><\/div><\/td>
0.4-0.6<\/div><\/div><\/div><\/td><\/tr>
Th\u00e9obromine<\/div><\/div><\/div><\/td>
0.05<\/div><\/div><\/div><\/td>
0.01<\/div><\/div><\/div><\/td>
1.0-1.5<\/div><\/div><\/div><\/td><\/tr><\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Le polyphone du th\u00e9 a un effet synergique avec la vitamine E pour \u00e9liminer les radicaux libres hydrosolubles\u3001remove lipid free radicals on micelles and biological membrane surface and break Free radical chain reaction. La s\u00e9quence de la vitesse de r\u00e9action du radical libre de la vitamine E et du polyph\u00e9nol du th\u00e9 : EGCG>ECG>EGC>EC, et elle pr\u00e9sente une voie inverse \u00e0 son potentiel d'oxydation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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L'effet d'inhibition du polyph\u00e9nol de th\u00e9 \u00e0 l'ONOO - l'oxyg\u00e8ne actif - est \u00e9videmment meilleur que la querc\u00e9tine et les vitamines. La recherche R1 de Pannala d\u00e9couvre que l'ECG et l'EGCG sont meilleurs que l'EC et l'EGC \u00e0 l'effet d'\u00e9liminer le peroxynitrite.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Les effets protecteurs des polyph\u00e9nols du th\u00e9 4 sortes de monom\u00e8res sur les l\u00e9sions de peroxydation lipidique des synaptosomes du cerveau induites par les ions de fer dans l'ordre suivant\uff1aEGCG>ECG>GTP>EGC>EC\uff0eLeur capacit\u00e9 \u00e0 \u00e9liminer les radicaux libres lipidiques produits par la peroxydation lipidique des synaptosomes est \u00e9galement un ordre similaire ECG>EGCG>EC>EGC. L'\u00e9tude Il de Salah et Rice Evans a trouv\u00e9 que les polyph\u00e9nols du th\u00e9 peuvent inhiber la peroxydation des LDL, la capacit\u00e9 d'inhibition est similaire \u00e0 la s\u00e9quence ci-dessus.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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L'effet d'\u00e9limination des polyph\u00e9nols du th\u00e9 sur les radicaux libres lipidiques comprend soit la peroxydation lipidique des synapses du cerveau, processus de d\u00e9part induit par les ions de fer, soit les radicaux libres lipidiques produits par la r\u00e9action en cha\u00eene de la peroxydation lipidique. Le r\u00e9sultat refl\u00e8te \u00e9galement le m\u00eame m\u00e9canisme d'action sur les radicaux libres et les polyph\u00e9nols du th\u00e9. La m\u00e9thode TBA est utilis\u00e9e pour mesurer l'effet d'inhibition des polyph\u00e9nols du th\u00e9 sur le produit final de la peroxydation lipidique ; le r\u00e9sultat refl\u00e8te principalement les r\u00e9sultats finaux des polyph\u00e9nols du th\u00e9 en tant qu'antioxydant.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u00c9tudiez l'effet protecteur contre les dommages oxydatifs de l'ADN de 4 monom\u00e8res de polyph\u00e9nol de th\u00e9 en utilisant la technologie de chimioluminescence. Nous avons d\u00e9couvert que la s\u00e9quence de l'effet protecteur contre les dommages oxydatifs de l'ADN est ECG> EC> EGCG> EGC. Pour d\u00e9terminer quel type de radicaux libres a caus\u00e9 des dommages \u00e0 l'ADN, nous utilisons la technique de pi\u00e9geage de spin ESR pour trouver la s\u00e9quence de pi\u00e9geage de l'hydroxyle produit par 4 monom\u00e8res de polyph\u00e9nols de th\u00e9 \u00e0 ce syst\u00e8me est \u00e9galement ECG> EC> EGCG> EGC, et entre-temps prouv\u00e9 les dommages \u00e0 l'ADN caus\u00e9s par le syst\u00e8me de r\u00e9action de (0P) 2Cun, le peroxyde d'hydrog\u00e8ne et l'acide ascorbique est principalement le radical libre hydroxyle.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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L'utilisation d'EDTA \/ riboflavine l\u00e9g\u00e8re Syst\u00e8me 0i a trouv\u00e9 un effet de pi\u00e9geage contre six sortes d'isom\u00e8res de polyph\u00e9nols de th\u00e9 am\u00e9lior\u00e9s avec l'ordre suivant : EC<(+)-C<EGC<GC<EGCG<GCG, c'est-\u00e0-dire l'effet d'\u00e9limination de trois sur plus d'un groupe d'acide gallique GCG et EGCG est plus fort que GC, EGC, EC et (+)-C, les cinq sur plus d'un groupe hydroxyle EGC et GC est plus fort que le EC et (+)-C. l'effet d'\u00e9limination du GCG, du GC et du (+)-C , respectivement meilleur que celui de leurs isom\u00e8res EGCG, EGC et EC, et cette diff\u00e9rence est plus prononc\u00e9e sur l'effet d'\u00e9limination \u00e0 faible concentration.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The pathogenesis of degenerative diseases are related to free radical damage, such as Alzheimer’s and Parkinson’s disease are two typical neurodegenerative disease. Although pathogenesis is multifactorial, but the accumulation of oxidative damage is an important cause of the disease, we have recently found that Tea Polyphenols can prevent apoptosis of PC12 cells induced by 6-OHDA and a preventive role in an animal model of Parkinson’s. The mechanism of tea polyphenols to prevent these diseases is very worthy of further study. Now there are already some studies show that tea polyphenols can enter the bloodstream and can cross the blood-brain barrier. However, these studies require in-depth, such as the concentration of polyphenols into various organs and tissues, morphology and residence time and the mechanism of action of harmful free radicals are required to investigate.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

L'activit\u00e9 antioxydante du th\u00e9 est principalement li\u00e9e aux ingr\u00e9dients du th\u00e9, \u00e0 son contenu et \u00e0 sa fonctionnalit\u00e9 pour la sant\u00e9. En m\u00eame temps, elle a clarifi\u00e9 le principe de travail de ces ingr\u00e9dients principaux comme les polyph\u00e9nols et les cat\u00e9chines du th\u00e9 et d'autres composants chimiques.<\/p>","protected":false},"author":1,"featured_media":6265,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[16,54],"tags":[197,146,196,195,198],"class_list":["post-6263","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-newssort","category-tea-culture-sort","tag-effective-ingredients","tag-egcg","tag-ingredient","tag-tea-antioxidant","tag-tea-polyphone"],"acf":[],"yoast_head":"\nTea Antioxidant Activity Summary - YiBei Organic Tea Online<\/title>\n<meta name=\"description\" content=\"Tea Antioxidant Activity, Ingredients, Content, Tea Polyphenols, Catechins, Chemical Composition, EGCG, Lipid Free Redical\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecoteapro.com\/fr\/tea-antioxidant-activity-summary\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tea Antioxidant Activity Summary - 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