查询词典 mandelic acid

1 At a reaction temperature of 100 ℃ and a reaction time of 30 min to give 2,which was then subjected to condensation reaction with p-propoxy mandelic acid in the presence of phosphoric acid at a molar ratio of m(2)∶m( p-propoxy mandelic acid )∶m=1∶1∶1 at a reaction temperature of 60 ℃ for 3 h to yield 3,which was further oxidized by chloranil to give t.

对现有分散红356合成工艺进行了优化，以n∶n=1.2∶1投料，100℃反应30 min得缩合物2，再在等质量磷酸催化下与分批加入的等质量对丙氧基扁桃酸60℃缩合3 h得缩合物3，经温和氧化剂四氯苯醌氧化得标题化合物，总收率55%。

Mandelic acid tends to be very well tolerated, especially compared to other alpha hydroxy acids such as glycolic acid.

扁桃酸往往是非常很好的耐受性，特别是比起其他阿尔法羟基酸如乙醇酸。

Alpha hydroxy acids – include glycolic acid, mandelic acid, malic acid, lactic acid.

阿尔法羟基酸-包括乙醇酸，扁桃酸，苹果酸，乳酸。

The minimum spermicidal concentration being(0.05 mg/ml) in(3 min) of the sasanqua saponin sterilant was corresponded with nonoxynol spermicide and was lower than mandelic acid(0.1 mg/ml and citric acid(0.25 mg/ml.

结果 油茶皂素不育剂对雄性小鼠呈现出较优的剂量依赖性体外杀精活性，3 min时的最低杀精浓度为0.05 mg/ml，与人用杀精剂壬苯醇醚相当，比扁桃酸(0.1 mg/ml)和柠檬酸(0.25 mg/ml)低。

Results The spermicidal effect in vitro on male mice of the sasanqua saponin sterilant was provided with excellent positive relation in dosage-effect. The minimum spermicidal concentration being 0.05mg/ml in 3min of the sasanqua saponin sterilant was corresponded with nonoxynol spermicide and was lower than mandelic acid(0.1mg/ml) and citric acid(0.25mg/ml).

结果 油茶皂素不育剂对雄性小鼠呈现出较优的剂量依赖性体外杀精活性，3min时的最低杀精浓度为0.05mg/ml，与人用杀精剂壬苯醇醚相当，比扁桃酸(0.1mg/ml)和柠檬酸(0.25mg/ml)低。

Since 2002, Institute of Coal Chemistry, Chinese Academy of Sciences has been developing a new technology to prepare high-purity glyoxylic acid by maleic anhydride ozonation, which has been completed, and now the research of the downstream products of glyoxylic acid including vanillin, heliotropin and the substituted mandelic acid is underway.

中科院山西煤化所从2002年开始进行研究，完成顺酐臭氧化法制备高纯乙醛酸新技术工艺的开发，现正进行乙醛酸下游产品香兰素、洋茉莉醛、取代扁桃酸的技术研究。

The progress in synthesis of chiral mandelic acid and resolution of racemic mandelic acid are reviewed.

综述了手性扁桃酸的合成及外消旋扁桃酸拆分的研究进展。

Four series and sixteen solid complexes of rare earth chloride with 1-naphthoic acid (L_1),benzoic acid (L_2),phenylacetic acid (L_3) and Mandelic acid (L_4) have been synthesized by method of solid state reaction at low temperature,and then these complexes were characterized by chemical analysis methods.

本文采用低温固相合成法，以稀土氯化物、1—萘甲酸(HL_1)、苯甲酸(HL_2)、苯乙酸(HL_3)、苯羟乙酸(HL_4)为原料，以六次甲基四胺为质子受体，合成并表征了四个系列十六种固态配合物。

A new method for the separation and purification of chiral mandelic acid by heated benzene extraction and refrigeration crystal was established. The ionization constant of mandelic acid was mensurated by pH potentiometer titration.

采用pH值电位滴定法测定了扁桃酸的离解常数，采用高效液相色谱法考察了扁桃酸在不同溶剂中的溶解度曲线和在苯-水体系中于不同pH值条件时的分配率，建立了热苯萃取和冷却结晶的扁桃酸纯化工艺。

The solubility curve of mandelic acid in different solvent and the distribute ratio of mandelic acid in benzene-water system in different pH condition were determine by HPLC. The results showed that the ionization constant pK_a of mandelic acid was 5.28, the solubility of mandeli...

研究结果显示，扁桃酸的离解常数pKa值为5.28；扁桃酸在水和苯中的溶解度曲线可分别表示为：S=38.756e0.0354t和S=0.2746e0.0649t；扁桃酸在水和苯中的溶解度差值曲线可分别表示为：ΔS/S1=0.1196t-2.712和ΔS/S1=0.3688e0.0723t；苯是最适合用于冷却结晶的溶剂；热苯萃取扁桃酸的苯水比例可选为1∶1；降低pH值有利于扁桃酸在苯中的分配。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。