铜锌超氧化物歧化酶与色氨酸钴(Ⅱ)的相互作用

采用ＶＩＳ、ＩＣＰ及酶活性测定等方法,研究铜锌超氧歧化酶（Ｃｕ２Ｚｎ２ＳＯＤ）与色氨酸钴（Ⅱ）（Ｃｏ（Ｔｒｐ）＾ｎ）的直接相互作用以及外加色氨酸钴（Ⅱ）的量、溶液ｐＨ值对此类相互作用的影响。结果发现：在水溶液中原酶活性中心处的Ｚｎ（Ⅱ）离子可被外加的色氨酸钴（Ⅱ）部分诱导、交换出来,而溶液中外加的Ｃｏ（Ｔｒｐ）＾ｎ中的Ｃｏ（Ⅱ进入酶的活性中心,形成“Ｃｏ－ＳＯＤ”酶衍生物,并相应影响了酶的催化活性     

Radiolysis of cyanocobalamin (vitamin B12)

Research on the radiolysis of vitamins is of considerable interest since these compounds are important nutritional constituents in foods and in dietetic supplements. In spite of these considerations there are few data and very often difficult to compare for the radiolytic behavior of vitamins. In this work we focused our attention on to the study of the radiolysis of cyanocobalamin (vitamin B₁₂) in solid state and in aqueous solutions. The procedure was followed by HPLC and UV-spectroscopy. The results obtained in aqueous solutions showed a dependence of the decomposition as a linear function of the dose. The G of decomposition for a 1×10⁻⁵ M solution was 3.3. In the solid state the vitamin was very stable towards the irradiation in the conditions used in this study with a G=2.1×10⁻³. A study made with Serratia marcescens as a microbiological contaminant showed that at the sterilization dose there is a destruction of the vitamin in aqueous solution. In the solid state the degree of decomposition was 7%.     

光谱、波谱法研究铜锌超氧歧化酶与氯化钴(Ⅱ)、组氨酸钴(Ⅱ)相互作用

我们首次发现的铜锌超氧歧化酶（Ｃｕ２Ｚｎ２ＳＯＤ）与氨基酸等发生直接相互作用的现象,是一种前人未研究过的重要的生化新现象［１］。在此新发现的基础上,本文用ＩＣＰ,ＶＩＳ,ＮＭＲ和酶活性测定等方法,又从不同角度拓展研究了Ｃｕ２Ｚｎ２ＳＯＤ酶与两类不同化合物,即无机氯化钴（ＣｏＣｌ２）、有机组氨酸钴（Ｃｏ（Ⅱ）（Ｈｉｓ）ｎ）的直接相互作用,发现酶活性中心金属离子同样与外加的这两类不同化合物发生相互作用,相应地影响了酶的催化活性。还发现Ｃｏ（Ⅱ）（Ｈｉｓ）ｎ比ＣｏＣｌ２与酶相互作用更强、更快,Ｃｏ（Ⅱ）（Ｈｉｓ）ｎ中的Ｃｏ（Ⅱ）更易进入酶中,更影响了酶的催化活性。     

Interaction of ferrocenecarbaldehyde with zinc tetrahydroborate and its derivatives

Ferrocenecarbaldehyde was reduced to methylferrocene upon interaction with zinc tetrahydroborate in THF. The reactions proceeded rapidly (5–10 min) in high yields (ca. 90%). Analogous results were obtained when a mechanically activated mixture of zinc chloride and sodium tetrahydroborate or the complex of zinc tetrahydroborate with dibenzo-18-crown-6, 2Zn(BH₄)₂·DB-18-C-6, was used in the reaction. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 214–216, January, 1999.     

基于有机溶剂原位制备的致密疏水铜金属层在保护锌负极中的应用

通过在 N-甲基吡咯烷酮(NMP)有机溶剂中锌电极与 CuI之间的置换反应,在锌电极上原位构建了一层致密且疏水的铜金属保护层(Cu@Zn)。铜金属保护层能有效地隔离锌电极与电解液的接触,减少锌电极-电解液界面的析氢和腐蚀等副反应。同时,铜金属保护层还具有较好的亲锌性,更小的界面电阻,更低的成核能垒,有利于锌离子均匀沉积,从而有效抑制了锌枝晶的生成。Cu@Zn对称电池实现了超过 1 700 h(1 mA·cm^-2)和 1 330 h(3 mA·cm^-2)的循环寿命。采用商用 MnO₂与之匹配得到的Cu@Zn||MnO₂全电池不仅在1 A·g^-1下具有168.5 mAh·g^-1的可逆比容量,还可稳定循环2 000次以上。     

血清碱性磷酸酶对人体缺锌、补锌的估价作用

概述了碱性磷酸酶（AKP）的基本结构、分型及其血清AKP变化的病理、生理因素，并回顾与总结了多年来国内外学者对血清AKP活力与锌(Zn)含量之间关系的基础与临床研究状况。     

水溶液中金属铅诱发芳香醛的烯丙基化反应

超声辐射下,在Pb-THF-NH4C1-H2O体系中,烯丙基溴与一系列芳香醛室温反应4h,得62%～98%烯丙基化产物;而同样体系中搅拌20h,高烯丙基醇产率为63%～97%.     

Synthesis and spectral characterization of zinc(II) complexes of N(4)-substituted thiosemicarbazone derived from salicylaldehyde: Structural study of a novel –OH free Zn(II) complex

Five novel zinc(II) complexes of salicylaldehyde 3-hexamethyleneiminyl thiosemicarbazone were synthesized and physico-chemically characterized. The complexes were given the formulae [Zn(HL)₂] (1), [Zn(L)py] (2), [Zn(L)bipy] · 3.5H₂O (3), [Zn(L)phen] · H₂O (4) and [Zn(L)γ-pic] (5). The thiosemicarbazone binds the metal as a dianionic ONS donor ligand in all the complexes, except in 1. Compound 1 is a homoleptic complex with zinc occupying the center of a distorted tetrahedral environment and being coordinated by two azomethine nitrogen and two thiolate sulfur atoms.     

基于内标CF-LIBS的混合水溶液中多金属元素的定量分析

提出一种简化内标自由定标激光诱导击穿光谱(CF-LIBS)分析方法,并应用于混合水溶液中Cr、Mn、Pb、Cd、Ca、Al、Co等金属元素绝对浓度的定量分析.实验结果表明,在最优化实验参数下产生的激光等离子体满足局部热平衡和光学薄条件,由该分析方法得到的LIBS检测精确度明显优于采用液固转换后的传统CF-LIBS方法,测定的浓度值与配置值的相对误差小于1%,说明应用该内标CF-LIBS方法能够同时精确测定液相基质中的多种微量金属元素的含量.