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茶叶中的宝贝以及禁忌

【字体: 】【2013-5-5】 【作者/来源 威廉希尔网】 【阅读: 次】 【关 闭
茶在国人眼中,并不是单纯的饮料,而是具有防病保健的良药。速溶茶喝茶并不简单,要注意的东西很多,今天就给大家介绍茶叶中有利健康的宝贝以及喝茶的禁忌。  
  茶氨酸强记忆  
  茶氨酸是茶叶中特有的游离氨基酸。茶叶中生津润甜的滋味就是它带来的。研究发现,茶氨酸可以提高脑内多巴胺的生理活性,因此它能使人精神愉悦,同时会增强记忆,提高学习能力。  
  茶单宁抗癌  
  茶叶中的苦味和涩味来自茶单宁,它占茶叶可溶性成分的40%-60%。养生花草茶茶单宁可是茶叶里的“第一大功臣”,它能抗氧化、提高免疫力,对许多癌症包括肺癌、食管癌、肝癌、结肠癌等有预防功效。  
  咖啡因提神  
  茶叶的可溶性成分中含有8%-10%的咖啡因。咖啡因能利尿,加速体内废物排出,同时还有提神的作用。另外,它还能增加新陈代谢,促进肌肉收缩。不过,茶泡得越久,渗出的咖啡因越多。睡眠不好的人、情绪易波动的人、孕妇等少喝为佳。  
  喝茶禁忌  
  时间忌太长:茶叶冲泡时间过长,可能会发生变质,甚至滋生致病微生物。  
  饭前忌大量:饭前大量喝茶,可能影响食物的消化和吸收,导致食欲下降。  
  饭后忌立即喝浓茶:一般来说,饭后喝茶有助于消食去脂。北京企业礼品定制但是如果饭后立即喝浓茶,则可能导致膳食中营养物质吸收不良,影响人们对铁质和蛋白质类物质的吸收。  
  泡茶忌过浓:茶越浓,刺激性越大。如经常大量饮用浓茶,会引起头痛、恶心、失眠、烦燥等。忌冲泡次数过多:除了乌龙茶等少数茶外,大多数茶只能冲泡3次。如果冲泡次数太多,90%以上的营养物质和功能成分均已被浸出,特有的滋味和香气也不明显。
  茶叶的品质好坏,在没有科学仪器和方法鉴定的时候,可以通过色、香、形四个方面的来评价。而用这四个方面来评定茶叶质量的优劣,通常采用看、闻、摸、品进行鉴别。即看外形、色泽,闻香气,摸身骨,开汤品评。  
  ①色泽----不同茶类有不同的色泽特点。绿茶中的炒青应呈黄绿色,烘青应呈深绿色蒸青应呈翠绿色,龙井则应在鲜绿色中略带米**;如果绿茶色泽灰暗、深褐,质量必定不佳。绿茶的汽色应呈浅绿或黄绿,清澈明亮;若为暗黄或混浊不清,也定不是好茶。红茶应乌黑油润,汤色红艳明亮,有些上品工夫红茶,其茶汤可在茶杯四周形成一圈**的油环,俗称“金圈”;若汤色时间暗淡,混浊不清,必是下等红茶。乌龙茶则以色泽青褐光润为好。  
  ②香气----各类茶叶本身都有香味,如绿茶具清香,上品绿茶还有兰花香、板栗香等,红茶具清香及甜香或花香;乌龙茶具熟桃香等。若香气低沉,定为劣质茶;有陈气的为陈茶;有霉气等异味的为变质茶。就是苦丁茶,嗅起来也具有自然的香气。花茶则更以浓香吸引茶客。  
  ③口味----或者叫茶叶的滋味,茶叶的本身滋味由苦、涩、甜、鲜、酸等多种成分构成。其成分比例得当,滋味就鲜醇可口,同时,不同的茶类,滋味也不一样,上等绿茶初尝有其苦涩感,但回味浓醇,令口舌生津;粗老劣茶则淡而无味,甚至涩口、麻舌。上等红茶滋味浓厚、强烈、鲜爽;低级红茶则平淡无味。苦丁茶入口是很苦的,但饮后口有回甜。  
  ④外形----从茶叶的外形可以判断茶叶的品质,因为茶叶的好坏与茶采摘的鲜叶直接相关,也与制茶相关,这都反应在茶叶的外形上。如好的龙井茶,外形光、扁平、直,形似碗钉;好的珠茶,颗粒圆紧、均匀;好的工夫红茶条索紧齐,红碎茶颗粒齐整、划一;好的毛峰茶芽毫多、芽锋露等等。如果条索松散,颗粒松泡,叶表粗糙,身骨轻飘,就算不上是好茶了。
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