Adsorption of carbaryl using molecularly imprinted microspheres prepared by precipitation polymerization

To obtain the desired specific adsorbents for carbaryl to enrichment, separation, and analysis of trace pesticide residues in environmental water, molecularly imprinted polymer (MIP) microspheres were prepared by precipitation polymerization using carbaryl, methacrylic acid (MAA), ethylene glycol dimethacrylate (EGDMA), azobisisobutyronitrile (AIBN), and acetonitrile as template, functional monomer, cross‐linker, initiator, and porogen, respectively. Molecular modeling software was used to compute rational interaction between the template molecule and function monomer. The adsorption properties of carbaryl in acetonitrile for imprinted microspheres were evaluated by equilibrium rebinding experiments. Scatchard plot analysis revealed that there was one class of binding sites populated in the imprinted polymer microspheres with dissociation constants of 3.3 × 10^?2 mol/l and an apparent maximum number of 1.95 µmol/g. The specificity of the imprinted microspheres was investigated by binding analysis using carbaryl and structurally related carbamate pesticides. The results indicated that the obtained imprinted microspheres showed a good selectivity for carbaryl. Copyright © 2007 John Wiley & Sons, Ltd.     

用于液相中检测的压电免疫传感器研究

利用聚乙烯亚胺法,将Ｃ２型葡萄菌肠毒素（ＳＥ）抗体固化在未抛光的压电晶体的金电极上,利用双调式振荡电路制作的振荡器,构建压电免疫传感器,其稳定性,特异性都较好。     

Molecularly imprinted photonic polymer as an optical sensor to detect chloramphenicol

An inverse opal photonic crystal sensor that could specifically detect chloramphenicol (CAP) in a label-free way was introduced in the current research. A colloidal crystal template was first prepared from monodisperse SiO(2) nanospheres. Precursors with different compositions were infused into the void spaces of the respective templates and aggregated. The template and the imprinted CAP were removed, and a molecularly imprinted photonic polymer (MIPP) with numerous nanocavities derived from the SiO(2) template was prepared. The MIPP could specifically recognize the target CAP. The results showed that the embedding and transporting of CAP could change the reflection peak intensity of the MIPP. The MIPP exhibited good responsiveness, with a detection range from 1 ng mL(-1) to 1 μg mL(-1) of CAP. The MIPP response time was 8 min upon its addition to CAP at a concentration of 10 ng mL(-1), which is shorter than that of other methods. After repeated use, the MIPP maintained a good performance and detection capacity. Thus, the results prove that the novel sensor could specifically detect CAP in a simple, time-saving, and low-cost manner.     

阿齐霉素的伏安行为研究

在１．２ｍｏｌ／Ｌ ＮａＯＨ溶液中,阿齐霉素（ａｚｉｔｒｏｍｙｃｉｎ,简称ＡＺＭＣ）有一灵敏的还原伏安峰。当搅拌富集时间为１０s,扫速为５００ｍＶ／ｓ时其吸附伏 安溶出峰电位фp＝－１。３４Ｖ（ｖｓ．Ａｇ／ＡｇＣ１）。用线性扫描,计时库仑法,循环伏安及脉冲极谱等多种手段研究了该体系的伏安行为 和电极反应机理。实验表明该体系属于一有吸附性的不可逆过程,测得电极反应的电子转移数n＝２,体系的an＝１．１４     

The inclusion behavior of benzo-15-crown-5 with hydrated transition metal picrates

Six kinds of benzo-15-crown-5 (L) adducts having the stoichiometric formula M(Pic)₂ · L · xH₂O (M=Mn, Cu, x=2; M=Co, Ni, Zn, Cd, x=4; Pic means picrate anion) have been synthesized and characterized by EA, IR, UV and molar conductance. The X-ray crystal structural analysis of the benzo-15-crown-5 adduct with hydrated copper(II) picrate revealed that the benzo-15-crown-5 molecule virtually acts as a second-sphere ligand, which associates with the copper(II) ion by hydrogen bonding of the coordinating water molecule. By the comparison of the IR, UV spectra and molar conductance of the new adducts prepared, it can be deduced that the other adducts exhibit the similar coordination environment to that of the copper adduct.     

自动检测da/dN的微机系统

研制了一种da/dN自动检测系统;介绍了其工作原理和裂纹长度a及循环数N的采集方法;与传统的目测法做了对比;显示了该系统的优越性。     

Ni80P20合金的非晶化度与催化活性的关联

采用淬冷法,通过改变冷却铜辊的转速,得到了一系列具有不同非晶化度的Ｎｉ８０Ｐ２０合金材料。以乙炔加氢为探针反应的催化研究结果表明,合金的催化活性随非晶化程度的增加而增加,同时,非晶态合金具有比相应的晶态金合明显优良的催化稳定性,ＸＲＤ和ＡＥＳ深度分析显示：在氧化－还原活化处理过程中,相对晶态合金而言,非晶态合金显示明显的“惰性”,活化后的表面上含有较多的对加氢反应有促进作用的氧化镍相互作用的结构。     

Channeled substrate window twin stripe GaAs/GaAlAs visible laser: Fabrication and steady state analysis

GaAs/GaAlAs high power window stripe lasers are developed with straight ac-tive layer in region adjacent to facet and curved active layer in central part.Only one-step liq-uid-phase epitaxy(LPE)growth is used in the fabvrication to from two internal current patheslaterally,allowing of a very simple fabrication process.Optical coupling from two stimulatingregions makes less beam divergence.The steady state analysis of such laser structure agreewell with experimental results.     

Meso—四（4—N—苄基吡啶基）卟啉合镍（Ⅱ）的溶液配位化学研究

外批类化合物具有光物理、光化学、生物化学和配位化学等多方面的特殊性质，并具有多种应用，尤其是可望在氢能源开发方面发挥重大作用，由此，近年来对叶琳化合物的研究方兴未艾，叶琳化合物的电子光谱表现Soret带和Q带是其基本特征，通常，金属叶琳的Soret带为很强的单峰，而     

离子对反相高效液相色谱-蒸发光散射检测法测定三乙膦酸铝的含量

建立了以正丁胺为离子对试剂的反相高效液相色谱分析三乙膦酸铝含量的方法。采用Symmetry Shield RP18色谱柱分离,以甲醇-0.5%正丁胺水溶液(冰乙酸调节pH 5.0)(体积比为8:92)为流动相,流速为0.8 mL/min,蒸发光散射检测器(ELSD)检测。在上述条件下,三乙膦酸铝与其主要杂质亚磷酸盐、硫酸盐可以获得分离。在100～1200 mg/L范围内,进样质量与峰面积的双对数值呈良好的线性关系。100 mg/L和1000 mg/L两种质量浓度添加水平的回收率分别为100.58%和99.53%,其相对标准偏差(RSD)分别为0.62%和0.49%。该方法简便快捷,为三乙膦酸铝的定量分析提供了更加有效可靠的方法。