类黄酮

The results showed that all had flavones, among which Apium graveolens L.

结果表明，所测蔬菜都含有黄酮类物质。

MethodsHigh-performance capillary electrophoresis was used to analyze the chemical composition of Brassicaceae.

方法利用高效毛细管电泳法分析十字花科植物中化学成分（主要是以黄酮类成分为依据）的差异。

In order to find out the active components, the analysis on chemical composition of the leaf from Broussonetia papyrifera uangyechu through the technology of test tube and paper chromatography were accomplished. The results showed that the leaf contains phenols, amino acids, proteins, polypeptides, saponins, flavonoids and its saponins, sterols, and triterpenes.

为研究光叶楮叶中的化学成分，采用试管法和圆形滤纸层析法对其进行测定，结果表明：光叶楮叶片含有酚性成分、氨基酸、蛋白质、多肽、皂苷、黄酮及其苷类、植物甾醇、三萜等多种化学成分。

The quercetin and kaempferol were extracted from the sample with 90% of methanol by heating circumfluence for 45 min.

黄酮类化合物槲皮素和山萘酚是莲须中的主要有效成分，对其含量测定具有一定意义[1-2]。

Puertin is representative of isoflavone compounds. To study the mutual reaction between puertin and Cu, Ca, Fe, Zn, Al, and Mg which exist in Pueraria, methods of conductometric titration, spectrophotometry. and pH-potentiometric titration is used.

以葛根素作为异黄酮类化合物的代表，用电导法、分光光度法、pH电位法研究葛根素与葛根中含量较多的微量元素Cu、Ca、Fe、Zn、Al、Mg在水溶液中的配位作用，计算了金属配合物的稳定常数。

Metabolites, including 1 phenolic diterpene, 2 phenolic acids (rosmarinic acid and caffeic acid), 2 flavonoids (6-methoxyluteolin-7-glucoside and homoplantaginin) and 1 coumaric acid ( cis-4-glucosyloxycinnamic acid), were successfully identified from two rosemary extracts with chloroform-methanol ( v / v , 3/1) and 50% aqueous methanol on the basis of HPLC, UV, NMR and MS data.

基于高效液相色谱、紫外吸收、核磁共振波谱及质谱数据，具有代表性的6个迷迭香代谢物的结构得到了确定，它们分别为1个酚类二萜、2个酚酸、2个黄酮（6-甲氧基木樨草素-7-葡萄糖苷和高车前甙）和1个香豆酸(顺-4-香豆酸葡萄糖苷)。

Objective: Cynomorium contains a variety of chemical composition, flavonoids are the main features of one of the ingredients.

目的：锁阳中含有多种化学成分，黄酮类化合物是其主要功能性成分之一。

ResultBy this method the content of the total flavanone of Cyperus rotundus was C=0.186 4 mg/ml and the rate of recovery was 102.7%.

结论该方法采用全物理过程，无任何污染，是提取香附黄酮类物质的有效途径。

Taxus media ; taxane diterpene ; flavonoid ; chemical constituent ; structure identification

曼地亚红豆杉；紫杉烷二萜；黄酮类化合物；化学成分；结构鉴定

This paper detected the polyphenol and flavones in tea of Elsholtzia bodineri Vaniot. to appraise it quality.

设计总黄酮及多酚类物质的含量作为衡量指标，比较建水和石屏野山茶品质的优劣。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐