Dark Tea: A popular beverage with possible medicinal application

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.     

茶多酚与亚硒酸钠联合对EBV抗原表达的抑制作用

用间接免疫荧光法测定Ｒａｊｉ细胞和Ｂ９５－８细胞ＥＢ病毒抗原的表达。结果显示无细胞毒浓度的茶多酚与亚硒酸钠联合对Ｒａｊｉ细胞ＥＢＶ－ＥＡ表达有显著的抑制作用,优于单纯茶多酚或亚硒酸钠的抑制作用。两药显示相互协同增效的作用 。抑制率与药物浓度相关;单纯茶多酚对Ｂ９５－８细胞ＥＢＶ－ＶＣＡ表达无抵制作用,但茶多酚能增强亚硒酸钠对Ｂ９５－８细胞ＥＢＶ－ＶＣＡ表达的抵制作用,抑制率随药物浓度的升高而升高。     

Reversible hepatic veno-occlusive disease in an infant after consumption of pyrrolizidine-containing herbal tea

Veno-occlusive disease was diagnosed in an 18-month-old boy who had regularly consumed a herbal tea mixture since the 3rd month of life. The boy developed portal hypertension with severe ascites. Histology of the liver showed centrilobular sinusoidal congestion with perivenular bleeding and parenchymal necrosis without cirrhosis. The tea contained peppermint and what the mother thought was coltsfoot (Tussilago farfara). The parents believed the tea aided the healthy development of their child. Pharmacological analysis of the tea compounds revealed high amounts of pyrrolizidine alkaloids. Seneciphylline and the corresponding N-oxide were identified as the major components by thin-layer chromatography, mass spectrometry and NMR spectroscopy. We calculated that the child had consumed at least 60 g/kg body weight per day of the toxic pyrrolizidine alkaloid mixture over 15 months. Macroscopic and microscopic analysis of the leaf material indicated thatAdenostyles alliariae (Alpendost) had been erroneously gathered by the parents in place of coltsfoot. The two plants can easily be confused especially after the flowering period. The child was given conservative treatment only and recovered completely within 2 months.     

高效液相色谱法测定绿茶和饮料中的咖啡因

采用反相高效液相色谱法，固定相为十八烷基硅烷键合硅胶，以乙腈-水(20：80)为流动相，检测波长274nm，测定绿茶和饮料中的咖啡因含量。结果线性范围为3．9～3900ng，r=O.9999；绿茶和2种饮料的平均加样回收率分别为100．2％、100．1％和99．8％。该方法准确、简便、快速，适合绿茶和可乐型饮料中咖啡因的测定。     

回春茶的实验研究

回春茶的毒性研究表明：它对小鼠经口的ＬＤ５０为２３．３ｇ／ｋｇ。以１．４５ｇ／ｋｇ、１．９４ｇ／ｋｇ和２．９２ｇ／ｋｇ的本品给大鼠灌胃１个月，测睾酮值随剂量的增加而增大。长期毒性的各项检测指标均在正常生理值范围内。     

茶多酚对大鼠主动脉微血管样结构影响的研究

目的:开展茶多酚对大鼠主动脉微血管样结构影响,为其抗肿瘤血管生成分子机制研究提供实验资料.方法:大鼠主动脉无血清培养,加入茶多酚大、中、小剂量及bFGF(碱性成纤维母细胞生长因子),观察对微血管结构影响.结果:茶多酚大、中、小剂量均可抑制新生血管形成.结论:茶多酚能抗血管生成.     

茶多酚有效成分对淋巴细胞增殖的抑制和抗氧化作用

研究表明,茶多酚具有很强的消除有害自由基、抗衰老等多种药理作用[1],茶多酚临床治疗白癜风具有较明显的效果,但其各类组分在临床治疗白癜风所发挥的作用还未见报道。1材料与方法1.1动物C57BL/6(B6)小鼠,体质量(20±2)g,由浙江中医药大学实验动物中心提供。1.2主要药品与试剂H2O2、EGCG均购自美国Sigma公     

茶多酚抗过敏作用的研究

目的：研究茶多酚（ＴＰ）的抗过敏作用。方法：利用小鼠被动性皮肤过敏反应（ＰＣＡ）实验、组织胺引起正常豚鼠离体回肠收缩试验、豚鼠ＳｃｈｕｌｔｚＤａｌｅ回肠收缩反应以及测定过敏豚鼠肺脏ＳＲＳＡ含量等方法。结果：茶多酚能明显抑制小鼠被动性皮肤过敏反应、组胺所引起的回肠平滑肌收缩而使组胺收缩曲线右移,并抑制豚鼠ＳｃｈｕｌｔｚＤａｌｅ反应的回肠收缩以及致敏豚鼠肺组织中ＳＲＳＡ的释放。结论：茶多酚的抗过敏作用可能与抗组胺及抑制慢反应物质（ＳＲＳＡ）生成有关     

怡康菊茶HPLC指纹图谱研究

目的：采用HPLC建立指纹图谱测定方法,确保怡康菊茶的质量稳定性。方法：采用DiamomilC18色谱柱,甲醇-0．05％磷酸水为流动相进行梯度洗脱,流速1．0mL／min,检测波长280nm。结果：建立了怡康菊茶的HPLC对照指纹图谱,标示成品中的29个共有峰,并指认了原儿茶酸、绿原酸、金丝桃苷、五味子醇甲和五味子醇乙5种活性成分。结论：该方法简单,准确可靠,重复性好,可作为怡康菊茶质量控制的一种有效方法。     

妥布霉素地塞米松眼膏联合茶树油清洁湿巾治疗蠕形螨睑缘炎

目的：探讨妥布霉素地塞米松眼膏联合缘螨净茶树油清洁湿巾治疗蠕形螨睑缘炎的治疗效果。

方法：前瞻性临床研究。选取蠕形螨睑缘炎患者72例,随机分为3组,试验组给予妥布霉素地塞米松眼膏联合缘螨净茶树油清洁湿巾治疗,对照1组给予妥布霉素地塞米松眼膏联合茶树油眼膏治疗,对照2组给予茶树油眼膏治疗。治疗30d后,对患者进行症状评分、拔睫毛螨虫计数及裂隙灯下观察临床体征评分。比较三组治疗前后数据。

结果：三组治疗前后蠕形螨计数均有差异(P<0.01),症状总评分差值有差异(F=20.05,P<0.01),体征总评分差值有差异(F=8.10,P<0.01)。

结论：妥布霉素地塞米松眼膏联合缘螨净茶树油清洁湿巾治疗蠕形螨睑缘炎疗效显著,茶树油清洁湿巾具有便携、易保存、不易变质的特点。