查询词典 catechin

To provide theoretic base for the utilization of heliotrope new shoots of tea trees,biochemical properties of new shoots including the contents of polyphenal,amino acid,flavone and the components of catechin were studied.

为给茶树红紫色芽叶开发利用提供依据，对其部分生化特性，如茶多酚、氨基酸、黄酮类等的含量和儿茶素的组成等进行了研究。

The heliotrope new shoots contain more polyphenal,catechin,flanone and more L-EGCG which is healthful to human beings than the pure green new shoots.

安化群体品种茶树上的红紫色芽叶较纯绿色芽叶含有较多的茶多酚、儿茶素和黄酮类化合物，保健性强的L-EGCG含量亦偏高。

Near infrared spectroscopic model for determinating total catechin in tea polyphenol powder based on radical basis function network.

基于径向基函数网络的茶多酚总儿茶素近红外光谱检测模型的研究。

To further study the chemical constitutes of lipophilic active parts, we prepared Alc95% and Alc50% according to original literature. 20 compounds were isolated by using macroporous resin, silica gel, polyamide, Sephadex LH-20, Rp-18, preparative TLC and preparative HPLC chromato-graphy. The structures of them were elucidated by means of physical and chemical properties, modern spectroscopic analysis techniques—UV、IR、 EI/MS、ESI/MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC. They are nine anthraquinones: chrysophanol (95-1), physcion (95-2), emodin (95-5), aloemodin (95-7), rhein (50-1), sennoside A or B (50-6),ω-hydroxylemodin (95-10), chrysophanol-8-0-β-D-glucoside (95-12), aloemodin-ω-0-β-D-glucoside (95-13); three phenanthaquinones: tanshinone ⅡA (95-3), cryptotanshinone (95-6), tanshinone Ⅰ(95-4); one isoflavone: 7, 3'-dihydroxyl-5' methoxyisoflavone (95-14) and protocaechuic aldehyde (95-9), protocaechuic acid (95-11), astragaloside Ⅳ(50-4), amygdalin (50-5), 2, 3, 5, 4'-tetrahydroxylstilbene-2-0-β-D-glucoside (50-3),-catechin (50-2), cinnamic acid (95-8). Among them, 3'-dihydroxyl-5' methoxyisoflavone (95-14) is a new compound.

经过溶剂萃取、大孔吸附树脂富集、Sephadex LH-20精制、制备TLC及Semi-pre HPLC等手段从中分离了20个化合物，利用理化性质和波谱技术(UV、IR、EI／MS、ESI／MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC)相结合鉴定了它们的结构，分别为9种蒽醌类化合物：大黄酚，大黄素甲醚，大黄素，芦荟大黄素，大黄酸，番泻苷A或B，ω-羟基大黄素(ω-hydroxylemodin)，大黄酚-8-0-β-D-葡萄糖苷(chrysophanol-8-0-β-D-glucoside)，芦荟大黄素-ω-0-β-D-葡萄糖苷(aloemodin-ω-0-β-D-glucoside)；3种菲醌类化合物：丹参酮ⅡA(tanshinoneⅡA)，隐丹参酮，丹参酮Ⅰ(tanshinone Ⅰ)；1种异黄酮：7，3'-二羟基-5'-甲氧基异黄酮（7，3'-dihydroxy-5' methoxyisofla-vone）以及原儿茶醛，原儿茶酸，黄芪甲苷(astragaloside Ⅳ)，苦杏仁苷，2，3，5，4'-四羟基二苯乙烯-2-0-β-D-葡萄糖苷（2，3，5，4'-tetrahydroxylstilbene-2-O-β-D-g1ucoside），Z—儿茶素，桂皮酸。

Results Compound albicanyl caffeate displayed strong antifungal property with MIC 4 μg/ml, while moderate antifungal effects (MIC16 μg/ml)were observed with compounds emodin, resveratrol, 3,4'-difluorostilbene, 2,2'-difluorostilbene and 2,3',5'-trifluorostilbene. Pakyonol, catechin, ampelopsin A, 3,4,4'-trihydroxyl- bibenzyl, 2,4'-difluorostilbene, 4-fluorostilbene,2-methyloxy-4'-fluorostilbene showed lower activity with MIC 32 μ g/ml.

结果化合物albicanyl caffeate对白色念珠菌表现出强的抗真菌活性，MIC为4μg/ml；而化合物大黄素、白藜芦醇、3，4'-二氟二苯乙烯、2，2'-二氟二苯乙烯及2，3'，5'-三氟二苯乙烯显示出中等程度的抗真菌活性，MIC为16μg/ml；双联苄pakyonol、多酚类儿茶素、白藜芦醇二聚体野葡萄素A、3，4，4'-三羟基联苄、2，4'-二氟二苯乙烯、4-氟二苯乙烯及2-甲氧基-4'-氟二苯乙烯显示出较弱的抗真菌活性，MIC为32 μg/ml。

Synergetic antifungal effects were observed in the combination of albicanyl caffeate or 3,4'-difluorostilbene and fluconazole, whereas additive antifungal effects were revealed when catechin or resveratrol combined with fluconazole.

当与氟康唑联合时，albicanyl caffeate和3，4'-二氟二苯乙烯显示出协同抗真菌活性，而儿茶素与白藜芦醇显示出相加的抗真菌活性。

Xylem: Chinese P.chinensis Bge 49.15mg/g, Atlantic Ocean 46.58mg/g, UCB 55.28mg/g. 3.In certain condition, Gas-chromatograms and Mass spectrum are use to identifie phenol. Pistacia vera L .leave contain pyrocatechol 0.7640mg/g, pyrogallol 0.0580mg/g, gallic acid 1.03024mg/g, catechin 0.1040mg/g and coumaric acid by different pre-treatment methods.

采用不同方法提取阿月浑子叶片酚类物质，气相色谱-质谱法对其进行定性与定量分析，阿月浑子叶片中含有邻苯二酚0.7640mg/g；邻苯三酚0.0580mg/g；没食子酸1.3024mg/g；儿茶素0.1040mg/g，香豆酸；确定了最佳的前处理方法。

HPLC Determination of Gallic Acid , Salidroside and Catechin in Rhodiola crenulate

目的建立大花红景天中没食子酸、红景天苷及儿茶素的含量测定方法。

Ethanol for catechin ultrasonic extraction from cynomorium was used. Extraction was continued for twice,once for 80min.

采用50%乙醇对锁阳中的儿茶素超声提取2次，每次80min。

High performance liquid chromatographyquantitative determination for catechin in flavonoids which distilled in cynomorium was pilot studied.

用高效液相色谱对锁阳提取物中黄酮类物质--儿茶素进行初步研究。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。