共查询到20条相似文献,搜索用时 312 毫秒
1.
2.
3.
4.
5.
6.
<正>中国是茶文化的发祥地,随着生活水平的提高,对茶文化的需求日益增长。各种各样的茶城——茶叶大市场,迅速遍及大江南北,连偏处于北国一隅的哈尔滨近年也陆续出现了十几座茶城,茶叶行业似有崛起之势,茶叶的价格也在飞涨。继三年前出现每件要价几万"疯狂的普洱茶"之后,如今天价茶层出不穷,一款500克的"熊猫粪便茶"要价就高达22万元!"西湖龙井"500克要价18万!其他的高价茶叶也已不鲜见,轻则上千、动辄上万,茶叶怎么到了"比黄金还贵"的地步?饮茶 相似文献
8.
9.
10.
中华民族历史悠久、博大精深的茶文化,到宋代已发展到了极致。在浩如烟海的宋词中,与茶相关的作品不计其数,从采茶到制茶,从茶的功用到烹茶之法,及茶礼、分茶、斗茶、点茶、试茶、茶百戏等都有具体的描述。 相似文献
11.
Tea is a famous beverage that is produced from leaves of Camellia sinensis. Amongst the six major tea categories in China, dark tea is the only one that involves microbial fermentation in the manufacturing process, which contributes unique flavors and functions for the tea. In the recent decade, the reports about the biofunctions of dark teas have increased rapidly. Therefore it may be the proper time to consider dark tea as one potential homology of medicine and food. In this viewpoint, our current understanding of the chemical constituents, biological activities and possible health beneficial effects of dark teas were introduced. Some future directions and challenges to the development perspectives of dark teas were also discussed. 相似文献
12.
目的:比较云南5个产地普洱茶的抗氧化活性。方法:选择3年发酵的普洱饼茶,采用DPPH测定其抗氧化活性和自由基消除活性。结果:5个产地的普洱茶提取物均具有一定的抗氧化活性,以云南大理下关产普洱茶的抗氧化能力最强,其EC50值为8.88mg·L-1,云南思茅最弱,其EC50值为21.81mg·L-1,云南5个产地普洱茶抗氧化活性的强弱顺序依次为:大理下关普洱茶〉西双版纳普洱茶〉临沧普洱茶〉红河普洱茶〉思茅普洱茶。结论:普洱茶是一种优良的天然抗氧化剂和自由基消除剂,云南不同产地普洱茶的抗氧化活性略有差异。 相似文献
13.
不同产地普洱茶主要化学成分的比较 总被引:1,自引:0,他引:1
目的:综合比较并评价云南不同产地普洱茶的质量。方法:选择3年发酵的普洱饼茶,采用高效液相色谱法测定其没食子酸、咖啡因与(+)儿茶素含量,采用NaNO2-A1(NO3)3法测定其总黄酮含量,并采用硫酸苯酚法测定其总多糖含量。结果:5个产地普洱饼茶中,没食子酸含量差异较大,思茅产普洱茶含量最低为0.308%,大理下关产普洱茶含量最高为1.482%;咖啡因含量差异不大,含量均在2.366%~3.750%之间;(+)儿茶素含量均低于0.5‰,以思茅产普洱茶含量最低。5个产地普洱茶总黄酮和总多糖含量也有一定差异,总黄酮含量以思茅产最低为2.93%,西双版纳产最高为5.94%;总多糖含量以思茅产最低为4.35%,大理下关产最高为6.18%。结论:不同产地普洱茶化学成分存在一定的差异。 相似文献
14.
不同茶叶及茶多酚对高脂饲料致大鼠脂肪肝的影响 总被引:6,自引:0,他引:6
目的:考察不同产地绿茶、红茶以及绿茶多酚对高脂饲料致大鼠脂肪肝的影响.方法:大鼠喂饲高脂饲料制备大鼠脂肪肝模型,喂饲含不同茶叶或茶多酚的高脂饲料,观察体重变化、睾丸脂肪垫重量、血清TG和TC、肝脏脂肪性变、肝匀浆甘油三酯和胆固醇含量.结果:各受试物组睾丸脂肪垫重量均较模型对照组减轻,云南绿茶组和四川绿茶组肝匀浆甘油三酯和胆固醇均明显低于模型对照;茶多酚组肝匀浆甘油三酯也明显低于模型对照组,但高于云南绿茶组和四川绿茶,茶多酚组肝匀浆胆固醇低于模型对照组,但明显高于云南绿茶组和四川绿茶组;云南红茶组肝匀浆甘油三酯和胆固醇与模型对照组相当.结论:云南绿茶和四川绿茶均对高脂饲料致大鼠脂肪肝的形成有明显抑制作用;茶多酚也有一定作用;但云南红茶作用不明显. 相似文献
15.
Yellow tea is more potent than other types of tea in suppressing liver toxicity induced by carbon tetrachloride in rats 总被引:3,自引:0,他引:3
Hashimoto T Goto M Sakakibara H Oi N Okamoto M Kanazawa K 《Phytotherapy research : PTR》2007,21(7):668-670
The present study compared the effects of six Chinese teas categorized by their production process: green, white, yellow, oolong, black and pu-erh teas, on carbon tetrachloride (CCl4)-induced liver injury. Wistar rats were given ad libitum the Chinese teas prepared according to the home-style methods for 1 week, and then intraperitoneally injected with CCl4 (1 mg/kg body weight) or olive oil as a vehicle. The yellow tea significantly ameliorated the increase in the activity of the alanine- and aspartate-aminotransferases in plasma. Thus, the drinking of yellow tea may contribute to protection against liver injury. 相似文献
16.
17.
肺癌的发病率在全世界所有癌症中已占据首位,随着其发病率与死亡率的逐年增高,预防与控制肺癌成为世界普遍关注的问题。茶是一种保健饮品,味甘、苦,微寒,无毒,大量实验研究表明,茶叶中富含的多种功能性成分可用于预防、直接干预或辅助治疗肺癌等恶性肿瘤,可作为天然抗癌药物。茶中的茶多酚、咖啡碱、茶色素、茶氨酸、茶多糖等均可有效地抑制肿瘤细胞的分裂增殖、诱导肿瘤细胞凋亡、调控肿瘤发生相关的基因和蛋白表达。对1970年以来,茶中含有的一些主要的功能性成分预防和治疗肺癌的研究进展进行综述,以期为阐明茶干预抵抗肺癌的作用机制、更安全有效地利用茶及茶功能性成分抵抗肺癌、培育特定成分量高的茶树新品种、开发新型茶产品提供参考。 相似文献
18.
19.
Rooibos (Aspalathus linearis (Brum.f) Dahlg.) and honeybush (Cyclopia Vent. species) are popular indigenous South African herbal teas enjoyed for their taste and aroma. Traditional medicinal uses of rooibos in South Africa include alleviation of infantile colic, allergies, asthma and dermatological problems, while a decoction of honeybush was used as a restorative and as an expectorant in chronic catarrh and pulmonary tuberculosis. Traditional medicinal uses of Athrixia phylicoides DC., or bush tea, another indigenous South African plant with very limited localised use as herbal tea, include treatment of boils, acne, infected wounds and infected throats. Currently rooibos and honeybush are produced for the herbal tea market, while bush tea has potential for commercialisation. A summary of the historical and modern uses, botany, distribution, industry and chemical composition of these herbal teas is presented. A comprehensive discussion of in vitro, ex vivo and in vivo biological properties, required to expand their applications as nutraceutical and cosmeceutical products, is included, with the main emphasis on rooibos. Future research needs include more comprehensive chemical characterisation of extracts, identification of marker compounds for extract standardisation and quality control, bioavailability and identification of bio-markers of dietary exposure, investigation of possible herb-drug interactions and plant improvement with regards to composition and bioactivity. 相似文献
20.
综述文献资料,对我国别样茶之一的香风茶进行总结和探讨。香风茶为蜡梅科蜡梅属植物山蜡梅Chimonanthus nitens Oliv、柳叶蜡梅C.salicifolius S.Y.Hu和浙江蜡梅C.zhejiangensis M.C.Liu的嫩叶经加工而成,具有祛风解表,理气化痰,醒脾化浊等功效。香风茶在我国民间应用广泛,历史悠久。现代研究表明,其主要化学成分为挥发油、黄酮和生物碱类等,药理活性主要为抗菌抗病毒、降压、降脂减肥、抗氧化和抗肿瘤等作用。香风茶是一种具有广阔开发前景的茶饮,值得继续深入系统研究。 相似文献