Crystal Structure and Activity against Acetaminophen-induced Hepatotoxicity of a Potassium Complex with Taurine-5-bromosalicylaldehyde Schiff Bases

A novel potassium complex KC9H9NO4SBr has been synthesized and characterized by IR spectra and single-crystal X-ray diffraction method. The crystal belongs to orthorhombic, space group Pbca with a = 0.74040（15）, b = 0.74960（15）, c = 4.2620（9） nm, V = 2.3654（8） nm^3, Mr = 346.24, Dc = 1.945 g/cm^3, Z = 8, F（000） = 1376, μ（MoKa） = 4.005mm^-1, GOOF = 1.021, R = 0.0471 and wR = 0.0872. In the crystal, the potassium ion is typically eight-coordinated, surrounded by eight O atoms from six （E）-2-（5-bromo-2-hydroxy-benzyli-deneamino）ethanesulfonate anions. The neighboring potassium ions are bridged by sulfonate groups into a two-dimensional layer structure, above and below which the 5-bromo-2-hydroxy-benzene rings are protruded. The activity against acetaminophen-induced hepatotoxicity of this complex was also studied, and found it can protect liver from hepatotoxicity induced by acetaminophen （AAP） to some extent.     

Isolation and Purification of Unstable Iridoid Glucosides from Traditional Chinese Medicine by Preparative High Performance Liquid Chromatography Coupled with Solid-phase Extraction

An efficient preparative method was successfully developed for isolation and purification of unstable components from medicinal plant extracts, using a combined method of preparative high performance liquid chro-matography(HPLC) and solid-phase extraction(SPE). The aim of this study was to obtain an effective method with high preparative efficiency and importantly to avoid the transformation of unstable compounds. The preparative HPLC system was based on an LC/MS controlled four-channel autopurification sys...     

二维材料改性水性聚氨酯防腐涂料的研究进展

水性聚氨酯涂料作为一种新兴的环保涂料,在防腐领域得到了广泛应用。然而,水性聚氨酯涂料交联密度低,耐水性稍差,不利于其长效防腐性能。利用具有独特物理化学特性的二维材料作为水性聚氨酯的填料,可以有效改善其性能。本文主要介绍了三种二维材料(石墨烯、MXene和六方氮化硼)作为填料与水性聚氨酯进行复合,并重点介绍了石墨烯、MXene和六方氮化硼的改性方法,并对水性聚氨酯复合涂层的性能进行了阐述和比较,最后对未来二维材料/水性聚氨酯的复合材料的发展和应用进行了展望。     

单链和寡链等规聚苯乙烯聚集体的结晶行为

自1960年Hoffman等提出聚合物结晶成核理论以来,人们对聚合物结晶生长速率、片晶的侧向尺寸随过冷度的变化等现象成功地进行了理论描述．1997年,Hoffman等对聚合物结晶成核理论进行修正,将de Gennes的聚合物“蛇行”概念。引入表面成核理论,通过对单根分子链从过冷熔体“卷绕”到晶体前沿所需的时间进行估算,其结果远远低于Flory预言时间约3～5个数量级,据此,Hoff-man认为,在聚合物结晶过程中,分子链在强迫稳态下的“蛇行”运动有足够的时间解缠结和结晶。     

钴(Ⅱ)、镍(Ⅱ)-二甲酚橙多元络合物的光谱特性研究

研究了Co(Ⅱ)、Ni(Ⅱ)-NH3-XO混配络合物和Co(Ⅱ)、Ni(Ⅱ)-NH3-XO-CTMAB多元络合物的形成条件及吸收光谱特性,结果表明,在pH 9.5的氨性缓冲溶液中,[NH3]/[XO]值在100~400范围内所形成的钴、镍多元络合物的最大吸收波长分别为530和590 nm,钴的多元络合物在0~2.0 mg.L-1、镍的多元络合物在0~2.6 mg.L-1范围内符合比耳定律,相对标准偏差分别为2.1%和1.9%。     

聚乳酸/β-磷酸三钙多孔复合支架的制备及性能研究

以聚乳酸和β-磷酸三钙共混制备了多孔复合支架,并对其孔隙率、降解性和力学性能进行了研究。结果表明,β-磷酸三钙的引入可以有效地减缓支架的降解,提高支架的力学性能。     

纳米Bi-Ni氧化物改性碱性MnO2电极

电化学行为;纳米Bi-Ni氧化物改性碱性MnO2电极     

水杨酸钴非等温热分解动力学研究

用热分析(TG/DTG)、X射线衍射(XRD)技术研究了固态物质水杨酸钴在空气中热分解的过程。热分析结果表明,水杨酸钴在空气中分两步分解,其失重率与理论计算失重率相吻合;XRD结果表明,水杨酸钴分解的终产物为Co3O4。用Friedman法和Flynn-Wall-Ozawa(FWO)法求取了分解过程的活化能E,并用多元线性回归和多元非线性回归法给出了可能的机理函数,由这些方法得到的动力学数据相互比较吻合。     

NATIONAL STANDARD OF HEAT CAPACITY MEASUREMENT OF SOLIDS IN THE RANGE OF 4.2—90K——AN AUTOMATED ADIABATIC CALORIMETER FROM 25 TO 90K AND MOLAR HEAT CAPACITIES OF α-ALUMINA

The construction of an automated adiabatic calorimeter for heat capacity measurement ofsolids in the temperature range of 25- 90K is described in detail. The sample vessel of thecalorimeter has thin radial vanes which make no contact with its inner wall and are distrib-uted evenly, thus greatly improving the internal thermal equilibration of the vessel. Theprecision of temperature control for the adiabatic shields and electrical leads of the calori-metric system are heightened to a great extent by using the high precision ACD- 79 modeladiabatic controller specially developed by us for this purpose. Measurements of the heatcapacities of high purity α-Al_2O_3, one of the internationally-accepted standard referencematerials, agree with those of the National Bureau of Standards (NBS), USA within ±0.3%,demonstrating the reliability of this apparatus.     

多检测GPC/SEC技术在高分子表征中的应用Ⅳ.氘化高分子的溶液性质

采用体积排斥色谱法／ 示差折光指数／ 直角激光光散射／ 示差粘度三检测联用技术表征了氘化聚苯乙烯、聚苯乙烯和氘化聚苯乙烯－ 聚异戊二烯。结果表明,在θ条件下,虽然氘化聚苯乙烯的化学依赖性常数υＴ,ＤＰＳ比聚苯乙烯的化学依赖性常数υＴ,ＰＳ大,但２５ ℃时在四氢呋喃中,氘化聚苯乙烯的分子尺寸仍小于聚苯乙烯的分子尺寸。由于嵌段共聚物的淋洗体积随组成变化,所以用传统的ＳＥＣ／ＲＩ得不到准确的分子量。经比较膜渗透、小角激光光散射和基质辅助激光脱吸与离子化时间飞行质谱等的实验结果,证明体积排斥色谱法／ 示差折光指数／ 直角激光光散射／ 示差粘度三检测技术能准确地得到氘化二嵌段共聚物的分子量以及其它重要信息。