MALDI/TOF MS法测定蛇毒纤溶酶及磷脂酶A_2的分子量和纯度

目的： 分析测定长白山白眉蝮蛇蛇毒纤溶酶和磷脂酶A2 的分子量和纯度。方法与结果： 应用MALDI/TOF MS法测定纤溶酶的分子量为23333±90，磷脂酶A2的分子量为14000±20，相对偏差在0138%以内。结论： 应用此方法未检测到杂蛋白质谱峰的存在， 酶的纯度较好， 测得结果要比电泳法准确。MALDI/TOF MS提供了一种测定蛋白质药物纯度快速准确的新方法。

用MALDI-TOF-MS法快速测定天花粉蛋白分子量

采用MALDI TOF MS法快速测定了天花粉蛋白的分子量，并讨论和对比了三种不同基质对其影响，认为用基质芥子酸是最佳适宜条件。实验结果表明本方法优于其它传统的测定生物大分子分子量方法

MALDI-TOF-MS法用于谷脱甘肽S-转移酶分子量的测定

利用MALDI-TOF-MS法测定了谷胱甘肽S-转移酶的分子量,并讨论和对比了三种不同基质对其影响,认为用α-氰基-4-羟基肉桂酸(α-CHC)作基质是最佳适宜条件。实验结果表明本方法优于其它传统的测定生物大分子分子量方法。

MALDI-TOF质谱表征聚芳醚酮环状低聚物及其组分分布

应用介质辅助激光解吸离子化飞行时间质谱（ＭＡＬＤＩ－ＴＯＦＭＳ），以二羟基苯甲酸为介质、Ｎ２（３３７ｎｍ）为激光源，对两种聚芳醚酮环状低聚物的结构进行了确认，研究了环状低聚物不同聚合度组分的分布规律，并且与ＧＰＣ质量分析法作了比较，实验结果表明，ＭＡＬＤＩ－ＴＯＦ质谱是分析环状低聚物的准确、快速的工具之一．

糖的基质辅助激光解吸/电离质谱(MALDI-MS)研究

通过糖类化合物３种常用基质ＭＡＬＤＩ－ＭＳ分析效果的比较以及寡糖和多糖正、负离子ＭＡＬＤＩ－ＭＳ谱的对比，找到了适合糖分析的基质２，５－ＤＨＢ，探讨了糖类化合物激光解吸／电离条件下形成离子的过程，指出了Ｎａ＋、Ｋ＋离子在寡糖分子量测定中的重要作用，借助柱层析分离手段，成功地测出了分子量大于１００００的葡聚糖的分子量．

MALDI质谱检测蛋白质与富勒醇的非共价复合物

基质辅助激光解吸电离（ＭＡＬＤＩ）质谱由于受到酸性基质、样品制备、激光诱导聚合和基质加合物的形成等条件的限制而难以用于非共价复合物的检测．本文以芥子酸为基质，观察到蛋白质与富勒醇的特殊相互作用，一些质谱特征，如质量数迁移、宽的加合峰和定量结合比表明，在蛋白质和富勒醇之间形成了特殊的非共价复合物．其中，血红蛋白与富勒醇的结合比是１∶４，而肌红蛋白与富勒醇的结合比是１∶１．实验结果表明：富勒醇可用来保护血红蛋白，有在酸性介质中防止其分解的作用．因此，通过在基质组份中添加特性有机化合物保护被测样品，有可能实现用ＭＡＬＤＩ质谱测定四级结构蛋白质的分子量

酚醛环氧树脂的基质辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS)表征

用基质辅助激光解吸电离飞行时间质谱（MALDI－TOF－MS）技术研究了F－46和JF－43型酚醛环氧树脂。获得了该类树脂的聚合度及其不同聚合度组分的分子结构；发现该类树脂中含有环氧氯丙烷的聚合物，给出了可能的分子结构。

5种E型环氧树脂的基质辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS)表征

应用基质辅助激光解吸电离飞行时间质谱（ＭＡＬＤＩ－ＴＯＦ－ＭＳ）技术，研究了Ｅ－１２、Ｅ－３１、Ｅ－４２、Ｅ－４４和Ｅ－５１五种牌号环氧树脂。获得了该类树脂的聚合度及其不同聚合度所对应的分子结构；发现了该类树脂中有一定量的环氧氯丙烷的聚合物，并给出了可能的分子结构。

Using oxidized carbon nanotubes as matrix for analysis of small molecules by MALDI-TOF MS

Oxidized carbon nanotubes are tested as a matrix for analysis of small molecules by matrix assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS). Compared with nonoxidized carbon nanotubes, oxidized carbon nanotubes facilitate sample preparation because of their higher solubility in water. The matrix layer of oxidized carbon nanotubes is much more homogeneous and compact than that of nonoxidized carbon nanotubes. The efficiency of desorption/ionization for analytes and the reproducibility of peak intensities within and between sample spots are greatly enhanced on the surface of oxidized carbon nanotubes. The advantage of the oxidized carbon nanotubes in comparison with alpha-cyano-4-hydroxycinnamic acid (CCA) and carbon nanotubes is demonstrated by MALDI-TOF-MS analysis of an amino acid mixture. The matrix is successfully used for analysis of synthetic hydroxypropyl P-cyclodextrin, suggesting a great potential for monitoring reactions and for product quality control. Reliable quantitative analysis of jatrorrhizine and palmatine with a wide linear range (1-100 ng/mL) and good reproducibility of relative peak areas (RSD less than 10 %) is achieved using this matrix. Concentrations of jatrorrhizine (8.65 mg/mL) and palmatine (10.4 mg/mL) in an extract of Coptis chinensis Franch are determined simultaneously using the matrix and a standard addition method. (c) 2005 American Society for Mass Spectrometry.

Synthesis, optical and thermal characterization of novel thiazolyl heterocyclic azo dye

Thiazolyl heterocyclic azo dye and its metal (Ni2+, Co2+)-azo complexes were synthesized. Their structures were confirmed by elemental analysis, UV-VIS absorption spectra, FT-IR, H-1 NMR and MALDI-MS. The thermal properties of metal complexes were studied by DSC-TGA. The optical constants (complex refractive index N=n + ik) and thickness of the complex thin films on polished single-crystal silicon substrates were investigated on a scanning ellipsometer. Results indicate that thiazolyl metal-azo complexes possess good optical and thermal properties. They would be a promising recording medium candidate for NVD with the Super-resolution near field structure (Super-RENS) technology. (c) 2007 Elsevier B.V. All rights reserved.

Spectroscopic, and thermal studies of some new binuclear transition metal(II) complexes with hydrazone ligands containing acetoacetanilide and isoxazole

A new chelating ligand, 2-(2-(5-tert-butylisoxazol-3-yl)hydrazono)-N-(2,4-dimethylphenyl)-3-oxobutanamide (HL), and its four binuclear transition metal complexes, M-2(L)(2) (mu-OCH3)(2) [M = Ni(II), Co(II), Cu(II), Zn(II)], were synthesized using the procedure of diazotization, coupling and metallization. Their structures were postulated based on elemental analysis, H-1 NMR, MALDI-MS, FT-IR spectra and UV-vis electronic absorption spectra. Smooth films of these complexes on K9 glass substrates were prepared using the spin-coating method and their absorption properties were evaluated. The thermal properties of the metal(II) complexes were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC. Different thermodynamic and kinetic parameters namely activation energy (E