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本篇文章给大家谈谈儿茶酸,以及原儿茶酸有什么功效对应的知识点,希望对各位有所帮助,不要忘了收藏本站!

内容导航:
  • 什么是儿茶素
  • EGCG,是绿茶茶多酚的主要组成成分,EGCG的功效与作用有什么?
  • 儿茶素是什么东西
  • 儿茶素的功效与作用 儿茶素是什么
  • 普洱茶的内含化学成分有哪些
  • 茶叶中含有哪些成分?有哪些功效?饮食禁忌有哪些?

Q1:什么是儿茶素


简介

儿茶素及其氧化产物都是碳氢氧三元化合物,是由糖类经一系列酶的作用,通过莽草酸途径,形成苯环化合物,最后合成为儿茶素。儿茶素具有明显的酚的特性,能使重金属和蛋白质沉淀,所以,是一种酚性物。酚性物由于能使蛋白质沉淀,就具有大小不等的把生皮鞣成革的性能,因此也称为鞣质或单宁物质。儿茶素与一些典型的植物单宁(五倍子单宁等)相比,鞣革的性能是较弱的。

儿茶素 catechin

多羟基黄烷-3-酚之总称,但有时则特指(+)儿茶素。广泛分布于植物界,在Acacia catechu、gambir树皮中与单宁共同大量存在。单宁的作用很弱,但通过加热和酸等处理容易重合形成单宁。2,3位由于含不整齐的碳原子而具有非对应异构体。

儿茶素(Catechins)又称茶单宁,和咖啡因同属茶叶中的两大重要机能性成分,但是又以儿茶素为茶汤中最主要的成分。有些研究报告认为儿茶素具有药效,所以近来大家都愈来愈重视茶叶对人体的保健功效了。

儿茶素类属于多元酚类(Polyphenol)中的一种,因为有苦涩味,所以对茶汤滋味的影响蛮大的唷!茶叶中的儿茶素类可以分为三种游离型态(Catechin,C; Epicatechin,EC以及Epigallocatechin,EGC)、与两种酯化的没食子酸(gallic acid) (Epicatechin gallate,ECG及Epigallocatechin gallate,EGCG),而以后者(ECG及EGCG)的含量较多。目前国外已经将各种儿茶素类从茶汤中分离出来,并且纯化,以作为不同方式的运用。

儿茶素的功用:

1. 清除自由基:儿茶素是天然的油脂抗氧化剂,抗氧化活性甚至比维他命E还高!并且可以清除人体产生的自由基,以保护细胞膜。

2. 延缓老化:因为有清除自由基的功用,所以可以减缓衰老。

3. 预防蛀牙:因为茶叶中含有氟,所以可以使牙齿对酸的侵蚀具有较强的抵抗力。除此之外,也有临床实验指出,儿茶素类可以明显地减少牙菌斑以及减缓牙周病。

4. 改变肠道微生物的分布:儿茶素类可以抑制人体致病菌(如肉毒杆菌),同时又不伤害有益菌(如乳酸菌)的繁衍,所以有整肠的功能。

5. 抗菌作用:可以抑制引起人类皮肤病的病菌,并且对治疗湿疹有很好的疗效。

6. 除臭:儿茶素可以除去甲硫醇的臭味,所以可以去除抽烟者的口臭,并且减轻猪、鸡以及人排泄物的臭味(因为儿茶素可以抵抗人体肠道内产生恶臭的细菌)。

7. 其它:还有一些研究显示儿茶素还具有抑制血压(可降低舒张压与收缩压)及血糖(抑制醣分解酵素)、降低血中胆固醇及低密度脂蛋白(LDL),并增加高密度脂蛋白(HDL)的量(日本用来做低胆固醇蛋)、抗辐射以及紫外线(美国已做成预防紫外线的化妆品)、抗突变(在微生物已获得证实,但还没有人体试验的报告)等功用。

儿茶素相关信息

英 文:catechin

别 名:儿茶酸

提取来源:茶叶

性 质:黄烷衍生物。广泛存在于植物中,从水/醋酸中得含结晶水的针状结晶。熔点93~96℃;而不含结晶水的结晶熔点175~177℃。旋光度+16°~+18.4°。其外消旋体也呈针状结晶,熔点212~216℃。微溶于冷水、乙醚,可溶于热水、乙醇、冰醋酸和丙酮,不溶于苯、氯仿和石油醚。儿茶精的顺式立体异构体表儿茶精(epicatechin)也广泛存在于植物中,熔点242℃,旋光度[α]D-68°(乙醇中)。

CAS: 7295-85-4

EINECS 登录号: 230-731-2

分 子 式:C15H14O6.H2O

分 子 量:308.28

分子结构:

药理作用:儿茶素是茶叶的重要成分,具有防治心血管疾病、预防癌症等多种功能。它为还原性多元酚类物质,在水溶液中易被空气氧化,常用作抗氧化剂。右旋儿茶精还有降低毛细血管的通透性、止泻、止血、抗病毒、杀真菌、抑制ACE及预防胃溃疡等多种作用。还可用于染料和鞣革工业。

包装说明:毫升级,克级,公斤级

保 质 期:2年

保 存: 阴凉干燥,避光环境密封保存
今日天气详情" target="_blank" onClick="allCount('首页_点击_实况天气_实况天气')"> 0 °

本篇文章给大家谈谈儿茶酸,以及原儿茶酸有什么功效对应的知识点,希望对各位有所帮助,不要忘了收藏本站!

内容导航:
  • 什么是儿茶素
  • EGCG,是绿茶茶多酚的主要组成成分,EGCG的功效与作用有什么?
  • 儿茶素是什么东西
  • 儿茶素的功效与作用 儿茶素是什么
  • 普洱茶的内含化学成分有哪些
  • 茶叶中含有哪些成分?有哪些功效?饮食禁忌有哪些?

Q1:什么是儿茶素


简介

儿茶素及其氧化产物都是碳氢氧三元化合物,是由糖类经一系列酶的作用,通过莽草酸途径,形成苯环化合物,最后合成为儿茶素。儿茶素具有明显的酚的特性,能使重金属和蛋白质沉淀,所以,是一种酚性物。酚性物由于能使蛋白质沉淀,就具有大小不等的把生皮鞣成革的性能,因此也称为鞣质或单宁物质。儿茶素与一些典型的植物单宁(五倍子单宁等)相比,鞣革的性能是较弱的。

儿茶素 catechin

多羟基黄烷-3-酚之总称,但有时则特指(+)儿茶素。广泛分布于植物界,在Acacia catechu、gambir树皮中与单宁共同大量存在。单宁的作用很弱,但通过加热和酸等处理容易重合形成单宁。2,3位由于含不整齐的碳原子而具有非对应异构体。

儿茶素(Catechins)又称茶单宁,和咖啡因同属茶叶中的两大重要机能性成分,但是又以儿茶素为茶汤中最主要的成分。有些研究报告认为儿茶素具有药效,所以近来大家都愈来愈重视茶叶对人体的保健功效了。

儿茶素类属于多元酚类(Polyphenol)中的一种,因为有苦涩味,所以对茶汤滋味的影响蛮大的唷!茶叶中的儿茶素类可以分为三种游离型态(Catechin,C; Epicatechin,EC以及Epigallocatechin,EGC)、与两种酯化的没食子酸(gallic acid) (Epicatechin gallate,ECG及Epigallocatechin gallate,EGCG),而以后者(ECG及EGCG)的含量较多。目前国外已经将各种儿茶素类从茶汤中分离出来,并且纯化,以作为不同方式的运用。

儿茶素的功用:

1. 清除自由基:儿茶素是天然的油脂抗氧化剂,抗氧化活性甚至比维他命E还高!并且可以清除人体产生的自由基,以保护细胞膜。

2. 延缓老化:因为有清除自由基的功用,所以可以减缓衰老。

3. 预防蛀牙:因为茶叶中含有氟,所以可以使牙齿对酸的侵蚀具有较强的抵抗力。除此之外,也有临床实验指出,儿茶素类可以明显地减少牙菌斑以及减缓牙周病。

4. 改变肠道微生物的分布:儿茶素类可以抑制人体致病菌(如肉毒杆菌),同时又不伤害有益菌(如乳酸菌)的繁衍,所以有整肠的功能。

5. 抗菌作用:可以抑制引起人类皮肤病的病菌,并且对治疗湿疹有很好的疗效。

6. 除臭:儿茶素可以除去甲硫醇的臭味,所以可以去除抽烟者的口臭,并且减轻猪、鸡以及人排泄物的臭味(因为儿茶素可以抵抗人体肠道内产生恶臭的细菌)。

7. 其它:还有一些研究显示儿茶素还具有抑制血压(可降低舒张压与收缩压)及血糖(抑制醣分解酵素)、降低血中胆固醇及低密度脂蛋白(LDL),并增加高密度脂蛋白(HDL)的量(日本用来做低胆固醇蛋)、抗辐射以及紫外线(美国已做成预防紫外线的化妆品)、抗突变(在微生物已获得证实,但还没有人体试验的报告)等功用。

儿茶素相关信息

英 文:catechin

别 名:儿茶酸

提取来源:茶叶

性 质:黄烷衍生物。广泛存在于植物中,从水/醋酸中得含结晶水的针状结晶。熔点93~96℃;而不含结晶水的结晶熔点175~177℃。旋光度+16°~+18.4°。其外消旋体也呈针状结晶,熔点212~216℃。微溶于冷水、乙醚,可溶于热水、乙醇、冰醋酸和丙酮,不溶于苯、氯仿和石油醚。儿茶精的顺式立体异构体表儿茶精(epicatechin)也广泛存在于植物中,熔点242℃,旋光度[α]D-68°(乙醇中)。

CAS: 7295-85-4

EINECS 登录号: 230-731-2

分 子 式:C15H14O6.H2O

分 子 量:308.28

分子结构:

药理作用:儿茶素是茶叶的重要成分,具有防治心血管疾病、预防癌症等多种功能。它为还原性多元酚类物质,在水溶液中易被空气氧化,常用作抗氧化剂。右旋儿茶精还有降低毛细血管的通透性、止泻、止血、抗病毒、杀真菌、抑制ACE及预防胃溃疡等多种作用。还可用于染料和鞣革工业。

包装说明:毫升级,克级,公斤级

保 质 期:2年

保 存: 阴凉干燥,避光环境密封保存
今日天气详情" target="_blank">阴

空气质量65优
未来2小时内无雨~

刘涛身着印花套装成焦点 开启戛纳电影节之旅

    刘涛身"Hopefully when I'm done with my work here, the connection between the two universities will be further strengthened, and through that I will leave a legacy," Reimers said

    印花套装影节之旅The top domestic consumers, in descending order, are India, the EU, China, the US and Brazil成焦点开Standing sentinel around the mound are ghostly sculptures of small children, apparently made out of sugar-like granular material, wearing tags that read: "I am 9 years old and weigh 64 pounds

    刘涛身着印花套装成焦点 开启戛纳电影节之旅

    启戛纳电According to the National Soft Drink Association, the industry produces 600 12-ounce cans of sugary drinks per person per year, most of it what they call the full-sugar variety, and supplies more than a quarter of what Americans drink刘涛身The publicity stunt, created by Magnetic Collaborative agency to promote power bar-maker Kind's new line of fruit snacks, which have no added sugar, is meant to sound an alarm印花套装影节之旅In descending order, Brazil, India, the EU, Thailand, China and the US are the top producers成焦点开The survey, conducted in 2014 by China's health, education and sports authorities, found that the sugar intake of males 13 to 17 surpassed 8启戛纳电"There are now 30 percent more people who are obese than who are undernourished

    刘涛身The average child takes in 21 teaspoons a day, the AHA says印花套装影节之旅The white paper went to great lengths to define China as one of the "destabilizing factors" along with Democratic People's Republic of Korea成焦点开Officials should all start from basic positions and get promotions gradually

    启戛纳电He has been trying his best to achieve what he has vowed to do刘涛身I became the first South Korean person to receive the Chinese Central Government's Friendship Award in 2002 and the first from my country to get permanent residency in China in 2006印花套装影节之旅We didn't expect that we would come to love the country as much as we do," said Cho, who speaks fluent Mandarin成焦点开Some of China's practices are also worth learning, such as how it trains its officials

    " What do you feel has been China's biggest achievement over the past five years? What's the most notable change you've observed? China has achieved much in many aspects over the last five yearsOver the last 21 years, South Korean teacher Cho Sung-hye has contributed much to the friendship between the people of her country and China

    刘涛身着印花套装成焦点 开启戛纳电影节之旅

    A remarkable South Korean teacher took up residence in Hefei, Anhui province, at the urging of her young son and never looked back"Nowadays all the primary schools in my country have made Chinese-language courses available to students," said Cho, who was believed by some local media to have given the strongest push to the achievementIt was the first primary school in the country to do so"At the peak, I had 21 relatives living here, and there are still 12 of them now," Cho said

    For the last five years, the air has been clearing upWhat do you think China will be like in five years' time? How do you view China's longer-term future? Chinese people's incomes have increased significantly in recent years and they will become richer in the next five years" Cho and her husband have also donated hundreds of thousands of yuan to help prevent the children of poverty-stricken rural families in Anhui from dropping out of schoolCho said the number of the poverty-stricken students is declining, and they can now get more financial support from the government, rather than relying on occasional social donations

    Do you believe that some of China's experiences or practices could be used to solve pressing global problems? If so, what are they? China has a very mature and comprehensive system to foster leadershipWhat are your expectations for the upcoming 19th National Congress of the Communist Party of China? What are the key issues you care about most? I think China loves peace more than some of the developed countries

    刘涛身着印花套装成焦点 开启戛纳电影节之旅

    In recent years, I have received numerous awards from the Chinese governmentAnd she has brought even more students from South Korea to China

    By comparing these figures, Pew seems to suggest that China and the US are engaging in a popularity contest in the PhilippinesMeanwhile, two-thirds say having a strong economic relationship with China is more important for ties between the two nations, while only 28 percent say being tough with China on territorial disputes is more vitalFully 86 percent have a favorable view of Duterte himself; 78 percent support his handling of the illegal-drugs issue; and 62 percent say that the Philippines government is making progress in its anti-drug campaignThat was certainly not the policy under Obama when he launched the US pivot-to-Asia policy, trying to gang up US allies on ChinaAnd on global economic status, about half of Filipinos (49 percent) say that the US is still the leading economic power, but that is down from 66 percent who said so in 2015But Filipinos also share positive views of China and its leader, President Xi Jinping

    Since becoming Philippines president in June 2016, Rodrigo Duterte has refused to be used by the US to advance its strategyHowever, the Pew survey finds that Duterte and his policies are widely popular at home despite concerns expressed by some governments, in particular the US, over Duterte's clashes with drug cartels and alleged human rights violations

    In 2014, the Philippines was still led by Aquino IIIThis represents a dramatic shift since that question was last asked in 2015

    It clearly suggests that one's gain is another's lossThe Philippines under Duterte has tried to develop an independent foreign policy rather than being a US puppet most of the time

    The US government, lawmakers and pundits have generally expressed negative views of Duterte since he took office last JuneAnd overall, the perception gap between the US and China in the Philippines is narrowingAccording to the survey, 78 percent in the Philippines have a positive view of the US as of this spring, down from 92 percent who expressed positive sentiments in 2015But the Philippines, and indeed all the countries in the region, should be encouraged to have good relations with both China and the US, a real win-win situation for not just the three countries involved, but for the region and the world

    At the same time, 78 percent believe the current economic situation is good, and 57 percent are satisfied with the direction of the country, a 21 percentage-point increase from 2014, the last time this question was asked in the PhilippinesSome even believe that he would not able to serve the full six-year term

    A zero-sum mentality about China-US relations is reflected not only in the thinking of some US politicians, but also in a new survey conducted by the Pew Research CenterThe report finds that people in the Philippines still like the US and have confidence in its leader, President Donald Trump

    The survey released on Sept 21 bore a title saying people in the Philippines still favor the United States over China, but that the gap is narrowingA quarter now name China as the world's leading economy, up from 14 percent the last time the Philippines was surveyed

    Such an independent policy is dealing a heavy blow to those who still view the relationship between the three countries as zero-sumAnd despite the Philippines being the most pro-Trump nation in Pew's spring 37-country survey, confidence in Trump now is lower than it was in then-President Barack Obama in 2015The US was believed to be fully behind the scenes when the Philippines, under President Benigno Aquino III, filed the arbitration suit in 2013 against China in a tribunal in The Hague, a case in which China had refused to participateHis tough rhetoric on the US and softened rhetoric on China, especially compared with his predecessor Aquino III, has worried many in the US

    The Obama administration had done everything it could to internationalize the South China Sea issue and had used the Philippines, a US ally, to advance the American strategyThe negotiations may take days or weeks before a deal is struck between the future governing partners

    Winston Peters, the party chief of the New Zealand First Party, however, refused to say which party he would side withAUCKLAND - New Zealand's parliamentary elections on Saturday yield no clear winner as tally ended in the wee hours of Sunday, leaving the third largest party with 7

    The New Zealand First Party has garnered nine seats, making it the indispensable coalition partner for both the National Party and the Labor Party to form the governmentThe ruling National Party has secured 46 percent of the party votes, which transfer to 58 seats in the 120 member Congress in an Mixed-Member Proportional voting system, with the opposition Labor Party lagging behind at 35

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1 重庆松溉:“一品古镇 十里老街”刘涛身着印花套装成焦点 开启戛纳电影节之旅 23~26 °
2 台政客警告美国:别用威胁态度看大陆,中国人性格你不懂蔡当局挡台生赴陆实习 国台办:做法难看嘴脸卑劣 23~25 °
3 没有火箭 我们可以靠这些怪招去太空旅行汽油、柴油价格迎来下调 23~25 °
4 深圳一电机公司多人患白血病:当地卫生部门赴现场调查热点:正中珠江风波发酵 拖累一公司并购进程 23~25 °
5 【亚洲文明对话大会】热点:正中珠江风波发酵 拖累一公司并购进程 23~25 °
6 热点:2018年近半行业平均工资增速超10%习近平出席亚洲文明对话大会开幕式并发表主旨演讲 23~25 °
7 Get Angelababy同款牛仔外套,开春扮酷就靠它了!国际社会忧虑中美经贸摩擦升级 外交部:理解但挑事的是美国 20~25 °
8 大兴国际机场首次试飞 B787-9成功降落重视中葡关系是葡当前的重要国策 20~25 °
9 伊能静被赞冻龄 网友惊呼是儿子的女朋友一名19岁中国交换生在泰国死亡 死因仍在调查 17~25 °
10 资讯 | 2018年访匈牙利中国游客破25万人次奚梦瑶小腹隆起疑似有孕 梁安琪这样回应 12~25 °
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1 传统书院连通传统与现代 如何更好地活在当下中国驻西班牙大使探班武磊:刻苦训练,为国争光! -24~-12 °
2 习近平在亚洲文化嘉年华活动上的致辞(实录全文)资本:年内多家上市公司股东换购股票ETF -24~-9 °
3 探讨中德企业合作 服务惠州经济建设李海东:不要低估美国的好战传统 -23~-12 °
4 田文林:中东如何走出翻烙饼的循环台政客警告美国:别用威胁态度看大陆,中国人性格你不懂 -23~-8 °
5 大学生为换零花钱 将市价550万的房子贱卖320万习近平在亚洲文化嘉年华活动上的致辞(实录全文) -20~-8 °
6 新西兰总理答美记者提问:不理解美国为何没收紧枪支法美洲杯期间巴西推新举措 暴力球迷被禁止入境 -20~-8 °
7 探险家在马里亚纳海沟10927米处发现塑料垃圾多人银行卡莫名盗刷 警方:用ATM机前要做1个动作 -20~-5 °
8 普京乘专机视察国家试飞中心 6架苏57为其护航共享飞机亮相西安:观众空中体验“打飞的” -19~-10 °
9 何穗绿色长裙显清冷气质实拍俄胜利日阅兵:普京带领上万士兵高喊"乌拉" -18~-12 °
10 长篇累牍黑杨幂 被判赔5万后:我是大学生求放过多数网友投票赞成她“去死”后,马来西亚一女孩自杀 -18~-10 °
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空气质量排行榜

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排名 城市 今天空气
1 香港盲人学校设高中课程引争议移动支付为何在德国“长不大” 7优
2 新机:荣耀20现身跑分平台 关键配置信息均已曝光资本:年内多家上市公司股东换购股票ETF 7优
3 露肉季节倒计时,你准备好了吗?何穗绿色长裙显清冷气质 7优
4 IDC:一季度印度智能手机市场同比增长7% 小米第一艾诚对话张泉灵:想跳出玻璃缸的鱼 7优
5 “韩剧”反转?韩法院驳回对李胜利逮捕令移动支付为何在德国“长不大” 7优
6 艾诚对话张泉灵:想跳出玻璃缸的鱼China the largest chili producer 7优
7 单仁平:中国国运要依靠自强而非美国的善意保时捷Taycan内饰曝光 于今年9月正式发布 7优
8 巴黎埃菲尔铁塔被闪电击中 摄影师拍下震撼一幕冻龄女神俞飞鸿身着BV更显知性与身材! 7优
9 鲁迅孙子周令飞:对杜撰鲁迅语录,没必要一棒子打死美使馆:美国下令从伊拉克撤离“非紧急”工作人员 7优
10 高端MPV车型 别克GL8 4座版官图发布习近平出席亚洲文明对话大会开幕式 7优
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1 黄磊首谈从北电辞职:是离开了 但学生有成绩开心神奇世界看看看第195季 381严重
2 关注:旧金山成为首个禁止面部识别的美国城市问题:网络捐款平台屡次被曝信息失真 你还信吗? 324严重
3 共享飞机亮相西安:观众空中体验“打飞的”社评:乐见美俄改善关系,北京说的很有底气 273重度
4 谁在“出尔”,谁在“反尔” --“中国出尔反尔论”可以休矣神奇世界看看看第195季 270重度
5 【亚洲文明对话大会】奚梦瑶小腹隆起疑似有孕 梁安琪这样回应 269重度
6 高中举行吹乒乓球比赛:快乐减压 迎接高考马竞前锋格列兹曼赛季后离队 巴萨成最热门下家 257重度
7 维权一把好手!张馨予自曝现在私信全是网友求助人脸识别机、无人机 新职业折射创新驱动热 256重度
8 【壮丽70年·奋斗新时代】探讨中德企业合作 服务惠州经济建设 229重度
9 司法所长骚扰女缓刑犯 官方:属实,停职并立案调查跑者预防应力性骨折 需要多补钙缩短步幅 229重度
10 俞敏洪:再过40年至少三分之一的诺奖应被中国所有多数网友投票赞成她“去死”后,马来西亚一女孩自杀 226重度
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