A Sensitive Electrochemical Biosensor for Detection of Histone Deacetylase Activity Using an Acetylated Peptide

A sensitive electrochemical biosensor was developed for activity detection of histone deacetylase sirtuin2 (SIRT2) using an acetylated peptide substrate. This substrate could be recognized by anti‐acetylated peptide antibody, which could be detected using secondary antibody conjugated alkaline phosphatase which provided an amplified electrochemical signal. In the presence of SIRT2, the substrate was deacetylated, resulting in a decreased electrochemical signal that was correlated to the concentration of SIRT2. Under optimized conditions, the biosensor exhibited a wide linear range from 1 nM to 500 nM with a detection limit of 0.1 nM. The proposed biosensor was also used for detection of SIRT2 inhibitor.     

Unsymmetrical N and/or O-bridged calixarene derivatives: synthesis,structure and encapsulation of solvent molecules in the solid state

Eight unsymmetrical N and/or O-bridged calixarene derivatives were obtained by 1 (naphthalene-2,7-diol), 2 (bis(4-hydroxyphenyl)methanone), 3 (4,4′-methylenedianiline), 4 (3,3′-methylenedianiline), 5 (4,4′-oxydianiline) and 6 (4,4′-(perfluoropropane-2,2-diyl)dianiline) reacting with fragment a (4,4′-bis(dichloro-s-triazinyloxy)propane-2,2-diyldibenzene) and b (N,N′-bis(dichloro-s-triazinyl)-4,4′-methylenedianiline) under very mild reaction conditions via efficient fragment coupling strategy. We also obtained the crystal structure of 1a (tetraoxocalix[2](propane-2,2-diyldibenzene,naphthalene)[2]triazine) which can form a molecular capsule by two dimers with C–H?N and C–H?O quadruple hydrogen bonds, and it has the encapsulation ability toward solvent molecules.     

固相萃取-液质联用法同时测定水中的喹诺酮类和磺胺类抗生素

建立了固相萃取-超高效液相色谱三重四级杆质谱联用法同时测定水中痕量的5种喹诺酮类和6种磺胺类抗生素残留的方法,水样经过固相萃取富集后由液相色谱分离、三重四级杆质谱检测。该方法在8 min内完成对11种目标化合物的分析。喹诺酮类抗生素线性范围为0.5～50μg/L,磺胺类抗生素线性范围为1～100μg/L,相关系数均大于0.995,6次空白加标重复测定的相对标准偏差(n=6)为喹诺酮类抗生素5.3%～9.0%,磺胺类抗生素4.7%～10.2%。11种目标化合物的方法检出限在0.04～0.22 ng/L之间,实际样品的加标回收率为62.1%～137%。该方法操作简便,重现性好,可用于地表水中抗生素的检测。     

基于裂开型核酸适配体的液晶生物传感检测三磷酸腺苷

利用“适配体-目标分子-适配体”的“三明治”夹心方式构建液晶生物传感检测三磷酸腺苷(ATP). 将ATP核酸适配体片段作为捕获探针固定在经TEA/DMOAP混合组装膜修饰的玻片基底表面, 当ATP存在时, 裂开的两部分核酸适配体与ATP结合形成双链结构, 有效诱导液晶分子取向发生变化从而引起光学信号的亮度及颜色发生变化, 实现对ATP的检测, 该方法在ATP浓度为10 nmol/L时仍可观测到明显的光学信号变化. 这种“适配体-目标分子-适配体”的“三明治”夹心式液晶生物传感方法具有无需标记, 操作简单等特点, 在快速检测小分子等物质领域中有广泛的应用前景.     

Long-term follow-up analysis of zolpidem in fingernails after a single oral dose

The determination of xenobiotics in keratinized matrices, such as nails and hair, has received considerable attention because of the relatively long detection window for compounds. The distribution of xenobiotics in fingernails, unlike hair, was equivocal. The main aim of this study was to use follow-up surveys to measure zolpidem profiles in nails after subjects consumed a single dose of the drug. In addition, the zolpidem concentrations in nails were compared with data for different biosamples, such as hair and blood from previous work. With these preconditions, a high-performance liquid chromatography–tandem mass spectrometry method was developed and validated for the determination of zolpidem in nails. Nails underwent alkaline hydrolysis and were extracted with diethyl ether. A Capcell Pak C18 MGII column was used to separate the target compound, and an API 4000 Qtrap mass spectrometer was used as a detector. The results for nail samples from seven subjects who had taken a single 10 mg zolpidem dose were significant: two relatively high zolpidem concentrations were observed in the long-term follow-up analysis of nails. The zolpidem concentration was less than 1.74 pg/mg and less than 3.29 pg/mg in fingernails and toenails, respectively. The subsequent peak concentration of zolpidem was observed between 10 and 15 weeks after each subject took a single dose of the drug. This result suggested that the germinal matrix area was a primary in vivo pathway for zolpidem secretion into the nail. The analysis of biosamples, such as nails, may be a useful adjunct to conventional methods of drug testing and hair analysis. Further research is needed concerning the contamination risk in analysis of nail biosamples.     

压电晶体传感器的研究进展

本文简要介绍了压电晶体传感器的基本原理,以及基于质量、粘度、电导率变化的溶液分析法。重点介绍了电化学石英晶体微天平（EQCM）、压电生物传感器;对具有很大发展潜力和重要应用价值的串联式压电传感器（SPQC）、串联式表面声波电导传感器（SAW）、液隔电极式压电传感器（ESPS）等也作了简要说明。     

氢化硝基苯合成对氨基酚中活性炭负载铂催化剂的新制备方法研究

采用不同还原剂（甲醛、甲酸、硼氢化钾和氢气）,或于还原Pt(IV)过程中引入少量Pt/AC(AC：活性炭)催化剂“催化”氢气分子,制备了Pt/AC催化剂。其催化氢化硝基苯制对氢基酚的反应结果表明,制备催化剂时所用的还原剂对催化剂的活性影响很大,但对反应选择性影响较小。用甲醛、甲酸和硼氢化钾还原制成的催化剂的活性皆较高;以氢气还原制得的催化剂活性较差;采用“催化”氢气还原法,可大大提高Pt/AC催化剂的活性,与传统甲醛还原法相比,甲酸和“催化”氢气还原制备Pt/AC催化剂的方法较简便、有效。     

Binding equilibrium of I− to serum albumin with resonance Rayleigh scattering

The binding equilibrium between l^? and human serum albumin (HSA) or bovine serum albumin (BSA) has been studied by means of the resonance Rayleigh scattering (RRS) and equilibrium dialysis. It has been found for the first time that RRS and multiple frequency scattering (MFS) are enhanced as the l^? binding to the HSA and BSA, but fluorescence quenches. The equilibrium dialysis results suggest that the binding of l^? to HSA and BSA fits a phase-distribution model other than Scatchard model, and that the order of magnitude of its phase-distribution constant was found to be 10⁴. It is most probable that Cl^? or other anion ions influence the binding of l^? by changing the ionic strength in the solution. The dialysis at different pH indicates that the binding mechanism is due to the electrostatic forces between the l^? and protonated basic amino-acid residues.     

毛细管电泳法测定桑叶中的黄酮类成分──芦丁和槲皮素

 采用高效毛细管电泳法分离测定了新疆不同地区、不同采集期、不同品种的桑叶中的黄酮类成分芦丁、槲皮素的含量。以含有体积分数为 15 %甲醇的 10mmol/L的磷酸二氢钠 2 0mmol/L的硼砂溶液 (pH 8 6 2 )为电泳缓冲液 ,采用压力进样方式 ,在 2 5℃ ,2 0kV恒压下进行电泳分离 ,并在 2 45nm波长处检测。结果表明 ,桑叶中的两种目标组分在 12min内完全分离 ,且有良好的线性关系 ;芦丁和槲皮素的加样回收率分别为 95 6 4%和99 36 % ,其RSD分别为 2 2 5 %和 1 79% (n =6 )。方法简单、准确、快速。     

负载型La0.8Sr0.2MnO3燃烧催化剂的载体效应

用浸渍法制备负载型Ｌａ_（０．８）Ｓｒ_（０．２）Ｍｎｏ_３燃烧催化剂,比较了γ－ＡＩ_２Ｏ_３、α－ＡＩ_２Ｏ_３、堇青石（２ＭｇＯ·２Ａｌ_２Ｏ_３、５ＳｉＯ_２）和ＺｒＯ_2四种载体的负载效果．用ＸＲＤ,ＤＰＲ着重研究了γ－Ａｌ_２Ｏ_３载体上由于负载量不同、焙烧温度不同引起的催化剂物相变化和二甲苯完全氧化的催化活性变化．