茶素

茶儿茶素氧化产物体外清除·OH自由基作用的研究

Study on the ability of tea catechin oxidation for scavenging hydroxyl radicals

分析了苦丁茶多酚类总量、儿茶素组成、咖啡碱和维生素C含量。

Composition of catechins and contents of polyphenols , caffeine and vitamine C were analysed by HPLC method .

用HPLC法对儿茶素组分和氨基酸组分进行了分析。

HPLC and amino acid composition of catechin components were analyzed .

茶多酚中儿茶素类的HPLC分析方法学考察

Study on the Method of HPLC Analysis of Catechins in Tea Polyphenols

费鲁齐目前正在从事一项研究，在实验室动物身上研究柑橘类果汁和维生素C是否能增加儿茶素的吸收水平。

Ferruzzi is currently conducting a study examining whether citrus juices and vitamin C increase catechin absorption in lab animals .

高ECG型儿茶素纯化工艺研究

Study on the Purification Process of Tea Catechins with High ECG

茶儿茶素类和生物碱成分的HPLC分析

Analysis on Catechins and Alkaloids in Tea by HPLC

在油中的溶解性依次为：维生素E、特丁基对苯二酚、2,6-二叔丁基对甲酚、抗坏血酸、儿茶素；

Oil solubility decreased in this turn : Vitamin E , TBHQ , BHT ascorbic acid , catechin ;

茶碱及儿茶素组分的定量灵敏度分别为0.1μg和0.03μg。

Quantitative sensitivity of theine and catechin are 0 . 1 μ g and 0 . 08 μ grespectively .

pH值、消化酶和冲泡温度都影响儿茶素与蛋白质的络合。

Factors such as pH values , digestive enzymes and brewing temperatures do impact the binding between catechins and proteins .

采用HPLC分析了不同浸提方式的茶汤中主要儿茶素含量。

Main kinds of catechins in tea liquors extracted by different extract methods were analyzed by HPLC .

HPLC法测定茶叶水提液中五种儿茶素和咖啡碱及其用于茶叶分类的研究

Simultaneous Determination of Five Catechins and Caffeine in Tea by HPLC and Differentiation of Teas by Cluster Analysis

再用半制备型HPLC分离纯化，得到7种儿茶素的单体化合物。

The two fractions were separated and purified by semi preparation HPLC respectively to obtain seven catechin monomers .

吸附液pH对钙氟交互作用下茶园土壤外源氟形态分布的影响高效液相色谱法测定茶叶中儿茶素组分的含量

Effect of Adsorption Solution pH on the Distribution and Transformation of Extraneous Source Fluoride in Tea Garden Soil Under Interaction of Calcium-Fluoride

RP-HPLC测定家兔血浆中的儿茶素和表儿茶素

Determination of the catechin and epicatechin in rabbit plasma by RP-HPLC

高纯度儿茶素单体EGCG和ECG分离及纯化工艺研究

Studies on the Separation and Purification of High Content Tea Catechins EGCG and ECG

非硫解HPLC分析羟基肉桂酸类、原花青素B2、花青素及儿茶素单体。

Unthiolysis HPLC will be better for the hydroxycinnamic acids , procyanidin B2 and catechin monomers .

FTIR光谱显示，儿茶素诱导BSA的二级结构发生了变化。

According to FTIR , the secondary structure of BSA changed when catechin was added .

结论：微胶囊化儿茶素可能是通过提高其抗氧化能力而提高其对DNA损伤保护及损伤修复能力。

Conclusion Catechin microcapsulation can enhance the GMCs ability of repairing DNA damage , which may be due to elevating the capacity of its anti-oxidation by catechin microcapsulation .

相同pH时，消化酶也影响儿茶素的稳定性，在加酶的消化组中，总儿茶素的含量都更高。

Digestive enzymes also affected the stability of catechins at the same pH value as the results showed that group with digestive enzymes obtained more catechins .

结果表明，PC类物质具有很高的抗氧化活性，高于儿茶素、绿原酸、莨菪亭；PC抗氧化能力与构成的单体种类和连接方式相关，且与聚合度呈正比例关系。

The antioxidant capacity had relationship with the kind of monomer and monomer connection mode , and was direct proportion to the degree of polymerization .

儿茶素（EGCG）具有很强的抗癌变活性。

Catechins ( EGCG ) has a strong anti-cancer becomes active .

此外，在酯型儿茶素的没食子酰基基团和羟基苯基B环之间形成的螯状结构可能有助于咖啡碱的复合。

Besides , the structure formed between the the galloyl group in the molecule of ether type catechins and the hydroxyphenyl B ring was also beneficial to the complexing with the caffeine .

方法：采用HPLC法测定儿茶及儿茶提取物中儿茶素及表儿茶素的含量；

METHODS : HPLC was used to determine the contents of ( + ) Catechin and ( - ) Epicatechin in catechu and its extract ;

二次柱层析制备高纯度表没食子儿茶素没食子酸酯（EGCG）的工艺研究

Study on preparation process of high purity of epigallocatechin gallate ( EGCG ) by column chromatography

微胶囊化儿茶素治疗组24h尿蛋白排泄量显著低于儿茶素治疗组（p>0.05）。

24h urinary protein excretion in microcapsule group is lower than that of in catechin group ( p < 0.05 ) .

茶多酚的主要成分是儿茶素，由此证明，儿茶素类化合物与植物抗UV-B辐射损伤机制有关。

Using Arabidopsis , it was demonstrated that the tea polyphenols comprising mainly the catechins alleviate UV-B stress in plants .

外源诱导物WAT对茶树新梢儿茶素含量的影响

Effect of Exogenous Induction Material WAT on Catechins Contents of Tea Plant New Shoots

HPLC分析结果显示，茶多酚制品主要含表没食子儿茶素（EGC）、表没食子儿茶素没食子酸酯（EGCG）和表儿茶素没食子酸酯（ECG）三种儿茶素。

The analysis of HPLC demonstrated that the Tea-polyphenols production mainly contained three kinds of catechin : EGC , EGCG and ECG .

各种儿茶素中，EC和EGC比较稳定，不易受高温灭菌及高低温贮藏的影响。

EC and EGC were less susceptible to high temperature sterilization and the storage of high and low temperature .