查询词典 catechol

In the study, the roughhewn teapolyphenols aider extraction arepurified and separated, and the contents of some sorts of catechol couldbe exactly analyzed in HPLC with such advantages as short time foranalysis, easy operation, and so on.

通过正交实验的方法，提取茶多酚的最佳工艺条件为：27％的微波辐射功率；微波辐射9min；溶剂用量为40ml／g；润湿水量为4ml／g。

Catechol is mainly used for the intermediate of pesticides and dyes, also can be used the important intermediate of composed spicery and medicine.

可作为胶片的显影剂，感光树脂的热阻聚剂，抗氧化剂，防老剂，生产蒽醌、偶氮等染料的中间体。

The acetalization and ketalization of various aldehydes and ketones with catechol by using HY zeolite as catalyst were studied.

研究了 HY分子筛催化邻苯二酚与环己酮、丁酮、丙酮、丙醛、丁醛、异丁醛、戊醛、异戊醛、正己醛、正辛醛、苯甲醛、二苯甲酮等十余种醛的缩合反应。

Dioxymethylene Mandelic Acid was synthesized by Benzo[1,3]- dioxole which was prepared from catechol .

以邻苯二酚为原料制备胡椒环，然后再从胡椒环合成3，4—亚甲二氧基苯乙醇酸，研究了第二步的反应温度、反应时间以及物料摩尔比对收率的影响，该步反应收率为88%。

Three kinds of CpTiCl had been synthesized when was catechol , 2, 2′-biphenol , or 2, 2′-binaphthol , respectively. In the case of CpTiCl〓, was 8-hydroxylquinoline , 2-methyl-8-hydroxyl-quinoline , and 8hydroxyl-5-nitro-quinoline , respectively.

研究表明，这三类半茂钛配合物在助催化剂MAO作用下，于30℃、0.1MPa乙烯压力下均可催化乙烯聚合，并显示较高的活性，远高于未引入非茂配体的CpTiCl〓及不含茂环的相应非茂配合物的活性，这说明同时含一个茂配体和一个非茂配体的半茂配合物是烯烃聚合的优良催化剂。

The effects of reaction temperature, space velocity and the molar ratio of H2O2 to phenol on the concentration of diphenol product, the ratio of catechol to hydroquinone and reactive period of catalyst were investigated.

在连续全混反应器中，用含铁复合金属氧化物催化剂，研究了反应温度、空速、过氧化氢/苯酚对反应产物中苯二酚浓度、邻苯二酚/对苯二酚比例和催化剂的活性周期的影响。

Specificity studies on the substrate revealed that the HdPO was capable of oxidizing not only the o-diphenol, but also tyrosine. The apparent Km value on tyrosine was about 9.52 mmol/L. As shown in the experiments, HdPO behaved oxidizing activities both on diphenol and monophenol, which implies that the HdPO was probably not only a type of tyrosinase-type PO but also a catechol-type.

底物特异性研究还发现此HdPO不仅对邻苯二酚具有氧化活性，对酪氨酸底物也具有氧化活性，且对酪氨酸的Km值约为9.52mmol/L，说明该酶既具有酪氨酸酶活性，又具有儿茶酚酶活性。

As an intermediate for preparing vanillin derived from glyoxylic acid, 3, 4-dihydroxymandelic acid is synthesized based on condensation of catechol and glyoxylic acid in alkaline aqueous solution.

以邻苯二酚和乙醛酸为原料，在碱性条件下发生缩合反应，合成了3， 4-二羟基扁桃酸，此物质是多种香料和药物合成的重要中间体。

Isopropyl 1,3 benzodioxolane was synthesized from catechol and isobutyric aldehyde using the phosphotungstic acid supported on activated carbon as catalyst.

以邻苯二酚和异丁醛为原料，活性炭固载磷钨酸为催化剂合成了杀虫剂呋喃丹的中间体2 -异丙基- 1，3-苯并二氧五环。

SOD activity in RBC was detected by rapid catechol assay with microvolume of finger blood; serum LPO level was determined by TBA fluorescence colorimetric assay; plasma cAMP and cGMP concentrations were measured b...

超氧化物歧化酶是防御超作者单位：210042南京，中国医学科学院、中国协和医科大学皮肤病研究所；南京铁道医学院附属医院

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。