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Ingredients and physiological functions of Tea Leaves
1.
茶叶理化成分和生理效用茶叶理化成分和生理效用
2.
茶叶的理化成分茶叶的理化成分 茶叶的生理功效茶叶的生理功效
3.
茶茶 叶叶 的的 理理 化化 成成 分分 多酚类:18~36% 蛋白质和氨基酸:26~38%
碳水化合物: 18~28% 生物碱: 3~6% 维生素:0.6~1% 色素: 1%左右 矿质元素:3.5~7%
4.
茶多酚是茶叶中一类主要的化学成分。在干茶中含量为18~36%。 在茶树植株的各器官都有分布,但主要集中在嫩叶和芽。对茶叶的 品质影响最显著。茶叶嫩度越高,多酚含量越大。夏茶>秋茶>春 茶。大叶种>小叶种
它主要由黄烷醇类(儿茶素类)、花色素类(花白素和花青素)、 花黄素类(黄酮及黄酮醇类)、酚酸和缩酚酸、儿茶素氧化缩聚产 物(茶黄素、茶红素以及多种二聚、三聚、四聚等低聚的寡聚体) 等组成。以黄烷醇类(儿茶素类)含量最高,约占茶多酚总量的 70~80%。 多酚类是茶叶的主要功能性成分,目前已证明,多酚类具有防止血 管硬化、防止动脉粥样硬化、降血脂、消炎抑菌、防辐射、抗癌、 抗突变等多种功效。 茶茶 叶叶 的的 理理 化化 成成 分分 ︱︱ 多多 酚酚 类类
5.
黄烷醇类:茶叶中的黄烷-3-醇衍生物,俗称儿茶素类。大量存在于 茶树新梢中,占茶叶干重的12~24%,约为茶多酚总量的70~80%。 儿茶素中含量最高的为。分为简单儿茶素和酯型儿茶素。 EGCg:表没食子儿茶素没食子酸酯 EGC:表没食子儿茶素 ECg:表儿茶素没食子酸酯 EC:表儿茶素 C:儿茶素 GC:没食子儿茶素 GCg:没食子儿茶素没食子酸酯 Cg:儿茶素没食子酸酯 茶茶 叶叶 的的 理理 化化 成成 分分 ︱︱ 多多 酚酚 类类
6.
花色素类:花色素分为显性的花青素和隐性的花白素。花青素是使 植物的花、果、叶、茎等呈现出蓝紫红等色的色素,广泛的分布于 被子植物中。茶叶中花青素的含量约占干茶的0.01%。花青素与盐 酸共热形成无色花色素,又叫花白素,在适当条件下,花白素可转 变相应的花青素。花白素在茶树新梢中约占干重的2~3%。 花黄素类:黄酮、黄酮醇及其衍生物统称为花黄素类。已知有近 800种,使广泛分布于植物细胞中的一类水溶性色素。常为浅黄至 无色。偶为鲜明橙黄色。约占茶叶干重的3~4%。
酚酸类:茶叶中含有多种酚酸和缩酚酸类化合物,后者多为没食子 酸、咖啡酸、鸡纳酸的缩合衍生物。其中含量最高的有没食子素、 没食子酸、绿原酸等。总量约占茶叶干重的2~4%。 茶茶 叶叶 的的 理理 化化 成成 分分 ︱︱ 多多 酚酚 类类
7.
蛋白质和氨基酸 蛋白质主要由各种氨基酸组成,在一定条件下,蛋白质分解为氨基 酸。目前在茶树各组织中已发现氨基酸20多种,其中以茶氨酸、谷氨酸、 天门冬氨酸等三种含量最高,占游离氨基酸总量的73~88%。其中茶氨 酸约占总量的50~60%,谷氨酸占13~15%,天门冬氨酸占10%左右。 氨基酸的含量。嫩梗>嫩叶>老叶,大叶种>小叶种。春茶>秋茶 >夏茶。 氨基酸是人体的一种必需的营养成分,有的氨基酸和人体健康密切 相关,如谷氨酸能降低血氨、治疗肝昏迷,蛋氨酸能调整脂肪代谢。 茶茶 叶叶 的的 理理 化化 成成 分分
8.
碳水化合物 茶中的碳水化合物种类很多,主要有单糖类、双糖类、淀粉、纤 维素、半纤维素、木质素、果胶、糖甙、茶皂素、脂多糖等等。一些 不溶性的多糖如纤维素、半纤维素是茶渣的组成部分。 糖类的含量随着芽叶的成熟老化而增加。粗纤维可作为鲜叶嫩度 的标志。 可溶性糖除构成茶叶的滋味外,还参与茶叶香气的形成。 茶中的脂多糖类是脂类和多糖结合的一种大分子物质,对抗辐射 有独特功效。 茶茶 叶叶 的的 理理 化化 成成 分分
9.
生物碱 主要包括咖啡因、可可碱、茶叶碱,。咖啡因是茶中含量很高的一 种生物碱,含量达到2~5%。 咖啡碱在制茶过程中较稳定。嫩叶>老叶>梗,大叶种>小叶种。 夏茶>秋茶>春茶 咖啡因是一种中枢神经的兴奋剂,因此具有提神作用。由于茶叶总 的咖啡因是与茶多酚成络合状态存在的,所以它和有利台的咖啡因在生 理机能上有所不同。以前关于咖啡因有致畸、致癌的报道,现在的医学 证明在人正常饮用的剂量下这是没有科学根据的。 茶茶 叶叶 的的 理理 化化 成成 分分
10.
维生素 茶中含有丰富的维生素类,维生素B族、C、D、E、P、K、β-胡 萝卜素均有检出。其中维生素B族、维生素C属于水溶性维生素,通过 饮茶可以被人体大量摄入。维生素D、E、P、K、β-胡萝卜素属于脂 溶性维生素,所以在饮茶时被人体利用的数量有限。 茶茶 叶叶 的的 理理 化化 成成 分分
11.
矿质元素 茶叶中含有的大量矿质元素有磷、钾、钙、镁、锰、铝、硫;微 量矿质元素有锌、铜、钼、硼等。 另外茶中的氟元素含量远高于其他植物,平均为100-200ppm。氟 对预防龋齿和预防老年骨质酥松有明显效果。 局部地区的茶中硒素含量很高,而硒素具有抗癌的功效。 茶茶 叶叶 的的 理理 化化 成成 分分
12.
茶色素 茶中的色素类物质包括叶绿素、胡萝卜素、叶黄素、花青素、黄 酮类色素、茶红素、茶黄素、茶褐素等。其中茶红素、茶黄素、茶褐 素不但是红茶的主要呈味和呈色物质,而且还具有独特的保健功效。 在制茶过程中,因制茶技术条件不同,叶绿素遭到不同程度的破 坏,产生不同的茶叶叶色。茶叶的叶色与茶叶的香气、滋味是相联系 的。 茶茶 叶叶 的的 理理 化化 成成 分分
13.
成分 含量 作用 β胡萝卜素 维生素B 维生素C 维生素E 维生素P 维生素K 儿茶素类 咖啡因 叶绿素 茶氨酸 茶多糖 黄烷酮类 0.007~0.02% 0.01~0.015% 0.1~0.25% 0.02~0.08% 0.3~0.4% 0.02~0.025% 10~25% 2~5% 0.6~1.2% 1.0~2.0% 0.1~0.2% 0.6~0.7% 预防夜盲症、白内障、抗癌 预防皮肤病,保证神经系统正常 抗坏血症、预防贫血、抗氧化、抗衰老 抗衰老、抑制动脉粥样硬化、抗氧化、平衡脂质代谢 预防血管硬化、降血压 预防消化道溃疡 抗氧化、防龋、抗癌、抗突变、杀菌、抗病毒、消臭、抑制 动脉粥样硬化、降血压、抑制脂肪吸收 中枢神经兴奋、利尿、强心 消臭 恢复疲劳、消解紧张、增强思维 降血糖、预防糖尿病、抗辐射 降血压、消臭、增强血管弹性 茶茶 叶叶 的的 理理 化化 成成 分分 表1
茶内含成分含量及其作用
14.
茶叶按照我国的中医学说,有24功效。分别为:少睡、 安神、明目、清头目、止咳生津、清热、消暑、解毒、 消食、醒酒、去肥腻、下气、利水、通便、治痢、去 痰、祛风、解表、坚齿、治心痛、疗疮治瘘、疗饥、 益气力、延年益寿等。 现代医学也对茶的生理作用、药效、作用机理、功能 性成分作了大量研究。 茶茶 叶叶 的的 生生 理理 功功 效效
15.
兴奋提神作用 茶中的咖啡因和茶多酚类中的儿茶素类可以促进肾上腺垂体 的活动;诱导可促进兴奋功能的儿茶酚胺的合成,并阻止其降解。 通过茶的兴奋作用,可以刺激人体疲惫时机能衰退的大脑中枢神 经,使其由迟缓转为兴奋,集中思考力,达到益思的效果。 利尿作用、恢复疲劳 茶的利尿作用并不是因为饮茶时摄入大量水引起排尿的增 加,而是茶中的咖啡因、茶褐素、茶芳香油通过肾促进尿液中的 水滤出率,达到利尿作用。而且可以通过尿液,排除引起人体肌 肉、组织疲劳感的乳酸,可以使疲劳的机体得到恢复。 茶茶 叶叶 的的 生生 理理 功功 效效
16.
醒酒作用 浓茶可以醒酒,这是众所周知的。这主要是因为人体必需通 过肝脏将酒精水解,而这一过程需要维生素C的参与催化。由于绿 茶和乌龙茶中含有大量的维生素C,所以饮茶可以解酒。另外由于 茶中咖啡因的利尿作用和兴奋作用,饮茶后可以通过尿液将酒精 迅速排出体外,同时刺激麻痹的大脑中枢神经,有效的促进代谢 作用,因而茶可以发挥醒酒功效。 明目作用 由于人眼的晶状体对维生素C的需要量比其他组织高,所以维 生素C摄入量不足易导致晶状体混浊而患白内障,而茶中富含维生 素C,所以多饮茶有助于保护眼睛。另外由于茶中还富含β-胡萝 卜素,而该物质是维生素A原,所以多饮茶,尤其是绿茶对夜盲症 (维生素A缺乏症)由一定预防效果。 茶茶 叶叶 的的 生生 理理 功功 效效
17.
止痢,预防便秘 茶多酚类中的儿茶素类对引起痢疾的病原微生物的具有抑制 和杀灭作用,而且具有较长的疗效,所以茶的止痢效果早在临床中 得到应用。 茶多酚类具有收敛作用,可以使肠管蠕动增强,对习惯性便 秘和神经性便秘具有治疗效果;茶皂素类也具有促进小肠蠕动的作 用,对缓驰性便秘的有治疗效果。 消炎、杀菌、抗病毒 目前医学已证明,茶中的儿茶素类化合物对伤寒杆菌、副伤 寒杆菌、黄色溶血性葡萄球菌、金黄色链球菌、痢疾等多种病源细 菌具有明显的抑制效果。所以茶中儿茶素含量最高的绿茶杀菌活性 最高。此外茶中的黄烷醇类具有直接的消炎效果,另外它还能促进 肾上腺体的活动,通过增加肾上腺素的分泌减少血液渗出,达到消 炎的功效。 茶茶 叶叶 的的 生生 理理 功功 效效
18.
改善肠道微生物结构、帮助消化 茶中的多酚类对双歧杆菌有促进生长和增殖的功效,使肠道 中有益菌的数量增加。茶叶中的儿茶素类和咖啡因类可以增强消化 道蠕动,因而有助于食物的消化、预防消化道疾病的发生。另外茶 还具有吸附人体中有害物质的功能,所以饮茶还有净化脏器的作用。 减轻吸烟对人体的毒害 据研究,每吸一根烟,人体的维生素C含量会减少25毫克。经 常吸烟或吸烟量大的人,体内维生素C的含量较低。饮茶特别是绿 茶有助于补充因吸烟造成的维生素C损耗。茶多酚类物质对香烟中 苯并芘等致癌物的形成有抑制效果,还可以抑制香烟中致癌物对人 体细胞的诱导畸变。因此吸烟者同时饮茶对减轻香烟的毒害是有益 的。 茶茶 叶叶 的的 生生 理理 功功 效效
19.
预防衰老、增强免疫力 人体中脂质的过氧化过程和过量自由基的形成已证明是人体 衰老的机制之一,所以人们摄入一些具有抗氧化作用的物质,可 起到增强抵抗力、延缓衰老的作用。茶中含有的维生素C、E具有 抗氧化活性,另外儿茶素类的抗氧化活性更加明显,其抗氧化活 性强度远超过维生素C、E。而且茶中的茶多酚、咖啡因、维生素C 对自由基具有非常良好的清除效应。 茶对人体中T淋巴细胞的转化和NK细胞活性有明显的增强作用。 T淋巴细胞和NK细胞是具有自然杀伤作用的细胞群,它们可以直接 干扰或阻止病毒的生长,T淋巴细胞水平的高低代表人体免疫功能 的强弱。 降脂减肥 茶中的茶多酚和茶色素类可以分解脂肪,并把多余的脂肪排 出体外。喝浓茶尤其是乌龙茶更为明显,可以达到去油腻和减肥 的功效。 茶茶 叶叶 的的 生生 理理 功功 效效
20.
防止动脉粥样硬化、预防心血管疾病 茶中的茶多酚类具有降低血液中胆固醇含量、分解脂肪的功 能;儿茶素类、茶黄素、茶红素还有抗血小板聚集、血液抗凝和促 进纤溶作用、降低血液粘稠度。饮茶可以改善血液流变学特性和抑 制血栓的形成。茶既可以抑制动物细胞对脂肪的吸收,又可以加速 清除或分解已进入主动脉壁的脂质。所以饮茶能够防止动脉粥样硬 化、预防心血管疾病。 降血压作用 茶中的儿茶素类、茶黄素类对血管紧张素Ⅰ转化酶的活性有 明显的抑制作用。血管紧张素Ⅰ经转化酶作用形成血管紧张素Ⅱ, 血管紧张素Ⅱ的出现可导致血管收缩、促进胆固醇分泌,从最终导 致血压升高。所以抑制血管紧张素Ⅰ转化酶的活性可以达到降压的 效果。 茶中的儿茶素类、咖啡因还可使血管壁松弛,增加血管的有 效直径,通过血管舒张使血压下降。 茶茶 叶叶 的的 生生 理理 功功 效效
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降血糖、预防和治疗糖尿病 茶叶中的茶多糖、二苯胺、儿茶素类可以降低血糖含量,茶叶 中的维生素B1、C能促进人体的糖分代谢。所以长期饮茶可以预防 和治疗糖尿病。 抗癌、抗突变 癌症是目前世界上引起人类死亡率最高的疾病之一。目前对 茶的抗癌、抗突变研究的报道也是最多的。茶中的茶多酚类对多种 致癌物引起的皮肤癌、肺癌、胃癌具有明显的抑制效果。茶尤其是 绿茶和乌龙茶可以抑制最终致癌物的形成;调整原致癌物的代谢过 程,控制致癌物产生;茶多酚类物质可以和致癌物作用,改变其活 性或降低其含量;抑制致癌物和DNA的结合;茶中的儿茶素类和维 生素具有很强的自由基清除能力。过量的自由基易引发癌症。 茶茶 叶叶 的的 生生 理理 功功 效效
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防辐射 茶中的茶多酚类可以有效吸收放射性同位素,并阻止其扩 散;癌症患者在接受辐照治疗时,会因辐照引起血液中白血球含量 的下降,茶中的茶多糖可以增加白血球含量。 对重金属毒害的解毒作用 在日常生活和饮食中,人体经常会不知不觉的摄入多种对人 体有害的重金属,如铜、铅、汞、镉、铬、砷等。有些重金属还会 在人体中富集,会使人免疫力下降、寿命缩短。而茶中的茶多酚类 对重金属有强烈的吸附作用。可以大大降低重金属对人体的侵害。 茶茶 叶叶 的的 生生 理理 功功 效效
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