儿茶酚

通过对百合中多酚氧化酶（PPO）的粗酶液进行研究发现以儿茶酚为底物时它有两个最适pH，分别为4.0、7.0。

The enzyme activity showed two pH optima , at pH 4.0 and 7.0 with catechol as substrate .

结果显示Arnow分析和Atkin分析均成阳性，说明PVD既含有儿茶酚基团又含有氧肟酸基团，是一类混合型嗜铁素。

The results showed PVD is a kind of mixed siderophore containing both catechol and hydroxamate group .

综上所述，中国卤虫PO是一种属于儿茶酚酶类型的含铜金属蛋白酶。

All these demonstrated that AsPO is a copper-containing catecholase-type metalloenzyme .

RP-HPLC法测定鼠肝组织儿茶酚氧位甲基转移酶活性的研究

Study on Catechol-O-Methyltransferase Activity in Rat Liver by RP-HPLC

鲜切莲藕在贮藏期间TP、FP和儿茶酚的量先上升后下降；

The amount of TP , FP and catechol in fresh cut lotus root slices during storage period increased initially and decreased afterwards .

贮藏期间定期测定鲜切莲藕的褐变度（BD）、总酚（TP）、游离酚（FP）和儿茶酚含量。

The browning degree ( DB ), total phenols ( TP ), free phenols ( FP ), and catechol were determined periodically .

目的探讨抑郁症患者红细胞儿茶酚氧位甲基转移酶（COMT）活性及其与抑郁症发病机制的可能联系。

Objective To explore the relationship between catechol O-methyltransferase ( COMT ) activity and depression .

儿茶酚，儿茶素或是EGCG的药效都很强，而在绿茶中，这些抗氧化物的含量是红茶的三到四倍。

A potent catechin , epigallocatechin gallate , or EGCG , is three to four times more abundant in green tea than black .

结论儿茶酚-O位-甲基转移酶（COMT）抑制剂托卡朋能够改善PD的运动功能，尤其是运动减少和肌僵直，同时能改善患者的认知功能。

Conclusion Tolcapone could greatly improve PD patients'motor function , especially in hypokinesia , muscle rigidity , and which could also improve patient 's cognition ability .

目的测定正常中国人群红细胞儿茶酚氧位甲基转移酶（COMT）活性浓度值，为研究COMT活性变化在疾病诊断中的应用提供依据。

OBJECTIVE To explore the normal range of catechol-O-methyltransferase ( COMT ) activity in erythrocyte of Chinese Han people .

研究具有抗氧化、抗炎作用的绿茶中的主要活性成分表没食子儿茶酚没食子酸酯（EGCG）对紫外线辐射造成角质形成细胞损伤的保护作用。

The protective effects of ( - ) - epigallocatechin - 3 - gallate ( EGCG ) , the major polyphenolic constituent in green tea , on UV-induced keratinocytes damage .

目的：探索儿茶酚邻甲基转移酶（COMT）基因多态性同强迫症临床特征的关系。

Objective : To explore the relation between polymorphism of catechol-O-methyltransferase ( COMT ) gene and clinical characters of obsessive-compulsive disorder ( OCD ) .

克隆可能与加兰他敏生物合成相关的儿茶酚氧位甲基转移酶（COMT）基因的片段。

A putative segment of Catechol O-methyltransferase ( COMT ) gene was obtained which has been proved to be related with biosynthesis of galanthamine .

以儿茶酚为底物时它有两个最适pH，分别为4.0、7.0，在pH5.0-6.5之间酶活力可以在4℃保持至少10h。

The enzyme activity showed two pH optima , at pH 4.0 and 7.0 with catechol as substrate , and it was stable in the pH range from 5.0 to 6.5 at 4 ℃ for 10h .

COMT是儿茶酚-O-甲基转移酶的编码基因，其第4外显子的一个G/A转换可产生不同活性的等位基因。

Two alleles of the COMT gene as a result of a G / A transition in the exon 4 can lead to different COMT enzymatic activities .

COMT蛋白是多巴胺、肾上腺素及去甲肾上腺素的代谢酶，在儿茶酚雌激素的代谢中起重要作用。尤其是后者，可将雌激素代谢为具有抑癌作用的产物。

COMT can catabolize dopamine , adnephrin and arterenol and play an important role in the metabolism of catechol estrogens whose metabolism products show an inhibitive activity against cancer . 2 .

目的：探讨不同剂量长波紫外线（UVA）对体外培养的人真皮成纤维细胞胶原合成的影响，观察表没食子儿茶酚没食子酸酯（EGCG）对此影响的防护作用。

Objective : To study the effects of different dosage of ultraviolet A ( UVA ) on cultured human dermal fibroblasts collagen synthesis and the protective effects of ( - ) - epigallocatechin-3-gallate ( EGCG ) on UVA-induced inhibition .

酪氨酸在酶的作用下羟化为Dopa，Dopa再在一系列酶的作用下转化为儿茶酚类及其衍生物，并且参与到鞣化与免疫黑化中。

Dopa is produced by the hydroxylation of tyrosine , and it subsequently converts to oxidized catechols and their derivatives by a series of enzymes , which lead to tanning , melanization and immunity .

儿茶酚在预活化聚酰胺膜多酚氧化酶电流传感器上的响应特性

Characteristics of Catechol Response on the Amperometric Biosensor of Polyphenol Oxidase

儿茶酚及其衍生物抗癌活性的量子化学研究

Quantum Chemical Study on the Anticancer Activity of Catechol and Its Derivatives

正常中国汉人红细胞中儿茶酚氧位甲基转移酶的活性测定

Measurement of catechol-O-methyltransferase activity in erythrocytes of Chinese Han people

尼古丁、铈离子与儿茶酚等神经递质相互作用的电分析研究

Electroanalytical studies of the interactions between nicotine or cerium ions and neurotransmitters

儿茶酚氧化酶的催化机理及活性基团的研究

Study on the catalytic mechanism and active-site groups of CATECHOLASE

可能得原因是你的大脑缺少儿茶酚。

It may be because you are lacking catechins in your brain .

儿茶酚邻位甲基转移酶基因在小鼠动情周期和早孕期间的表达及调控

Characterization and Regulation of Comt Gene Expression during Mouse Estrous Cycle and Pregnance

儿茶酚邻甲基转移酶基因多态性与焦虑症的关联研究

Association study of polymorphism of catechol-O-methyltransferase and anxiety disorder

新疆杏属植物过氧化物酶儿茶酚氧化酶同工酶分析

Analysis of the isoenzymes of peroxidase and catechol oxidase of Armeniaca in Xin Jiang

土豆组织膜儿茶酚电极的研究

Studies on Biological Tissue Electrode Sensitive for Catechol

儿茶酚有助于保持我们的头脑敏捷、思路清晰、运转正常。

Catechins are great for keeping your mind sharp , fresh , and functioning properly .

汉族人群儿茶酚氧位甲基转移酶基因多态性及左旋多巴药动学研究甲异丙基溴丙烯巴比妥酸

COMT Gene Polymorphism and Levodopa Pharmacokinetics in Chinese Han Population ; methyl isopropyl bromallyl barbituric acid