检索结果-南通市图书馆

Polymorphism of d-mannitol:Crystal structure and the crystal growth mechanism

Chinese Journal of Chemical Engineering 2017年第3期25卷 358-362页

作者： Weiyi Su Na Jia Hongshi Li Hongxun Hao Chunli Li School of Chemical Engineering and Technology Hebei University of Technology School of Chemical Engineering and Technology Tianjin University

The polymorphism of d-mannitol(mannitol) is reviewed in this paper. It was found that the structure of the stable form is consistent in most literatures, but different authors have given different information about the two metastable forms. Therefore the commonly used nomenclature of mannitol was summarized based on the crystal unit cell parameters with the help of X-ray powder diffraction. Moreover, the crystal growth mechanism of mannitol polymorphs was summarized. Considering the lack of kinetic data for the metastable form especially, a reported method was attempted to apply to δ mannitol in an aqueous cooling crystallization process based on the induction time previously measured, and it was identified that the growth of the δ form follows the two-dimensional(2d) nucleationmediated mechanism. The results also indicate that the method based on induction time and supersaturation should have the potential to be expanded to the metastable polymorphs for the growth property study in a bulk system.

关键词： Crystallization Pharmaceuticals Polymorphism d-mannitol Crystal growth

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Structure of 1,2-O-(1-Aryl-1-Propylidene)-d-mannitol

引用

Chinese Chemical Letters 1997年第12期8卷 0-0,0-0页

作者： Jian Hua YU Yu Lai HU Wen Fei TAN Shi Yan YANG Yuan Qi YIN(State Key Laboratory for Oxo Synthesis and Selective Oxidation)(Lanzhou Insrtitute of Chemical Phaics, Chinese Academy of Sciences, Lanzhou 730000) State Key Lab. Oxo Synthesis/S.O. Lanzhou Inst. of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

A method for selective reaction of 1-aryl-propane-1-ones with 1,2-dihydrxy grop of d-mannitol in the presence of ZnCl2-BF3 Et2O to 1, 2_O-(1-aryl- propylidene )-d-mannitol (1-4 ) is described. The compounds were first reported and determined by IR, MS, 1H-/13C-NMR spectra.among them the Shae of 1 was further defined by X-ray diffraction

关键词： Synthesis and Structure of 1,2-O d-mannitol Aryl-1-Propylidene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative Heat Transfer data for Solid-Liquid Phase Change of d-mannitol and Adipic Acid

引用

Energy and Power Engineering 2022年第11期14卷 680-704页

作者： Ulyana Horbatyuk Ana Magalhães Victor Ferreira Carlos Pinho CEFT DEMEC Faculty of Engineering University of Porto Porto Portugal

The goal of this work was to measure the heat transfer rates from thermofluid, Therminol 66, to two phase change materials, d-mannitol and adipic acid. It concerns the determination of heat transfer coefficients for the design of a concentrated solar energy plant requiring PCM thermal energy storage and is part of a wider set of experiments, where several PCMs were tested. An experimental installation was used with a cylindrical vessel with three tubes disposed almost horizontally (5°inclination), containing the phase change material, around which the thermal fluid flowed almost perpendicular to the tubes. The experimental installation allowed to recreate heating and cooling cycles. In order to evaluate the influence of the flow on the rate at which the heating and cooling processes took place, tests were performed at different thermofluid mass flow rates, concluding that there is no great influence, since the thermal resistance inside the tubes is much higher than on the outside. d-mannitol and adipic acid, present different phase change temperatures, 164°C for d-mannitol and 152°C for adipic acid. The average heat transfer coefficient, during the phase change process, was of 340 W/(m2K) for d-mannitol and 1320 W/(m2K) for adipic acid.

关键词： Adipic Acid d-mannitol Heat Transfer Coefficient Phase Change Materials

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Practical Synthesis of (S)-(+)-2-(6-methoxyl-2-naphthyl) propionic Acid

引用

Chinese Chemical Letters 2002年第6期13卷 505-508页

作者： Hong Zhu MA Bo WANG Qi Zhen SHI departmentofChemistry NorthwestUniversityShaanXiKeyLaboratoryofPhysico－InorganicChemistryXi′an710068

A simplified procedure for enantioselective synthesis of (S)-(+)-2-(6-methoxyl-2- naphthyl) propionic acid ((S)-(+)-naproxen), starting from (6-methoxy-a-naphthyl) -1-propanone, with d-mannitol as auxiliary catalyzed ... 详细信息

关键词： Auxiliary d-mannitol enantioselective synthesis onepot (S)-(+)-naproxen.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Melanin Biosynthesis Stimulating Compounds Isolated from the Fruiting Bodies of <i>Pleurotus citrinopileatus</i>

引用

Journal of Cosmetics, dermatological Sciences and Applications 2012年第3期2卷 151-157页

作者： Tian-Xiao Meng Chao-Feng Zhang Tomofumi Miyamoto Hiroya Ishikawa Kuniyoshi Shimizu Shoji Ohga Ryuichiro Kondo department of Agro-Environmental Sciences Faculty of Agriculture Kyushu University Fukuoka Japan department of Nutrition and Health Science Faculty of Human Environmental Science Fukuoka Women’s University Fukuoka Japan Graduate School of Pharmaceutical Sciences Kyushu University Fukuoka Japan

In the course to find a stimulating compound for melanin biosynthesis, which should be useful for a gray and a white hair-preventive agent or tanning agent, we evaluated the effects of the methanol extract from mushroom of Pleurotus citrinopileatus on melanin production in B16 melanoma cells without theophylline. Activity-guided fractionation led to isolate myo-inositol (3) and d-mannitol (4) as the stimulating compounds on melanin production in B16 melanoma cells. Also, ergosterol (1), uracil (2), and d-glucose (5) have been isolated from the methanol extract of P. citrinopileatus and showed no effect on melanin production in B16 melanoma cells. These results indicated that myo-inositol (3) and d-mannitol (4) are potential candidates that could be useful such as a gray and a white hair-preventive agent or tanning agent.

关键词： Pleurotus citrinopileatus myo-Inositol d-mannitol Melanin Stimulating Activity White Hair-Preventive Agent Tanning Agent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：