形成微乳状液的萃取有机相结构的福里埃红外光谱研究——环烷酸钠皂-仲辛醇-煤油-水体系

用福里埃变换红外光谱(FT-IR)法研究了钠皂环烷酸体系的加水过程,观察到了环烷酸阴离子的水化效应,水合配位发生在皂化的环烷酸阴离子的羧基和部分未皂化环烷酸分子的羰基上。钠皂环烷酸微乳状液同时发生阳离子和阴离子的水化效应,巨大水化能的释放可能是微乳状液作为一种热力学稳定体系的实验证据。     

四磺酸酞氰锌四钾盐的合成与表征

四磺酸酞氰锌四钾盐的合成与表征;四磺酸酞氰锌四钾盐;磺酸邻苯二甲酸单钾盐;磺酸邻苯二甲腈单钾盐;     

玉米kn-1同源盒的高效表达

同源盒基因(homeoboxgenes)在植物,动物,真菌的广泛存在说明这种结构在真核生物进化过程中高度保守,并暗示其具有重要功能.本文将玉米kn-1同源盒插入表达载体pGEM△XbaI,并将形成的重组克隆pGEM△MK转化BL21(DE3)而获得高效表达;表达产物的分子量为29×103,并主要以可溶性蛋白形式存在.Kn-1,Quox-1,OSIH-1间的交叉免疫反应证实三者在蛋白质水平具同源性.而Kn-1同源结构域(Homeodomain)高效表达有助于进一步寻找其靶基因.     

二甲基甲酰胺和二甲基乙酰胺水化作用的福里埃红外光谱研究

应用光谱减法研究了二甲基甲酰胺(DMF)和二甲基乙酰胺(DMA)水化作用所引起的红外光谱变化,由于羰基和水分子形成氨键的水化作用,含水DMF和DMA的羰基伸缩振动向低波数移动,根据含水DMF和DMA中红外指纹区及远红外区某些谱带的变化,水化作用似乎也表现为酰胺基上具有孤对电子的氮原子与水分子形成氢键。DMF和DMA的水化作用使水峰向高波数移动。     

A New Triterpenoid Spaonin Isolated from the Seeds of Aesculus assamica Griff

The Aesculus genus consists of about thirty species distributed in Asia, Europe andAmerica. There are sixteen species distributed in China, and most of them are used asherbal medicines for the treatment of distention and pain in the chest and abdomen. Anu…     

Substitution Coordination Approach for Selective Determination of Complex: Pontachrome Violet SW/Fe(III)/Cu(II) System

The Substitution Coordination for Selective Determination (SCSD) was proposed by studying the complexations of pontachrome violet SW (PCV) with Fe(III) and Cu(II) at pH 5.5. The up dated approach to the de termination of binding constants of a complex was established by the spectral correction technique (SCT). The substitution complexation Cu(II) + Fe(PCV) → Cu(PCV) + Fe(III) has been applied to the direct selective determination of copper traces by the SCT with a high sensitivity.     

Controllable selective exfoliation of high-quality graphene nanosheets and nanodots by ionic liquid assisted grinding

Bulk quantities of graphene nanosheets and nanodots have been selectively fabricated by mechanical grinding exfoliation of natural graphite in a small quantity of ionic liquids. The resulting graphene sheets and dots are solvent free with low levels of naturally absorbed oxygen, inherited from the starting graphite. The sheets are only two to five layers thick. The graphene nanodots have diameters in the range of 9-29 nm and heights in the range of 1-16 nm, which can be controlled by changing the processing time.     

Preparation of albumin—PAA nanocapsules and their controlled release behavior for drugs

New kinds of narrowly distributed protein‐based nanoparticles, bovine serum albumin‐Poly (acrylic acid) (BSA/PAA) nanospheres, and nanocapsules were prepared via in situ polymerization, swelling, and re‐aggregation. The structure and morphology of the nanospheres were characterized by UV‐Vis, FT‐IR, DLS, and TEM. The stability of the BSA/PAA nanospheres and nanocapsules was increased when their skeletons were fixed by cross‐linked agents. The nanospheres carried a positive charge and their size was about 80–110 nm. The protein‐based nanocapsules were stimuli‐responsive with pH value and their hydrodynamic diameter varied from 70 to 230 nm with changes of pH. In vitro release experiments of Rhodamine B and Doxorubicin hydrochloride showed that these biopolymer nanoparticles provided a controlled release of the entrapped drugs for 300 hr. Copyright © 2009 John Wiley & Sons, Ltd.     

苯基荧光酮－TritonX－100荧光熄灭法测定微量钼研究

本文用荧光熄灭法研究了苯基荧光酮－ＴｒｉｔｏｎＸ－１００－Ｍｏ（Ⅵ）体系的测定方法及条件。在ｐＨ１．０～３．０的盐酸介质中，Ｍｏ（Ⅵ）检测限为０．２μｇ／２５ｍＬｆｆ在０．２～２．０μｇ／２５ｍＬ范围内具有线性关系。本法灵敏度高，选择性好，用于检测球墨铸铁中的微量钼，结果满意。     

α-四(烷基苯氧基)酞菁配合物的合成与表征

以邻苯二甲酸酐为原料，经硝化、氨化、亲核取代和金属离子模扳等多步反应合成了两个系列共5个叔丁基取代苯氧基金属酞菁配合物，产物经元素分析，IR表征，测定了目标配合物的紫外可见吸收光谱、荧光光谱及在有机溶剂中的溶解性。结果发现：与无取代金属酞菁配合物相比，Q带最大吸收光谱波长红移；在710nm波激发下，目标配合物在环已烷等有机溶剂中均有荧光发射(最大发射波长在760nm左右)；在二氯甲烷、氯仿、环已烷、Py、苯、甲苯、乙基环已烷、乙基溶纤剂等中溶解性能良好。