涂碳型PVC膜盐酸氯丙那林离子选择电极的研制与应用

报道了一种检测盐酸氯丙那林的新方法。以盐酸氯丙那林和四苯硼钠的缔合物为电活性物制备了涂碳型PVC膜盐酸氯丙那林离子选择电极,建立了电位分析法对盐酸氯丙那林进行测定。电极的线性响应范围为1.0×10-1~1.0×10-5mol/L,线性回归方程为E=-54.3pc+472.9,检出限为3.72×10-6mol/L。用该电极测定猪饲料中盐酸氯丙那林的含量,结果与液相色谱-串联质谱法一致。     

纳米Fe_2O_3修饰涂碳型硫酸沙丁胺醇选择电极的研制与应用

制备了以纳米Fe_2O_3为修饰剂的涂碳型硫酸沙丁胺醇选择电极,采用电位分析方法对其各项性能进行测定。结果表明,该纳米Fe_2O_3修饰电极有很好的能斯特响应,其线性范围为1.0×10~(-6)~0.1 mol/L,级差电位为59 mV/pC,与普通电极相比,响应时间较短(10 s),检出限更低(2.8×10~(-7)mol/L)。将修饰电极应用于猪肉样品中硫酸沙丁胺醇含量的测定,结果与标准方法结果相符。     

叶酸对磁性Fe_3O_4纳米粒子的表面修饰

以FeCl3·6H2O作为单一铁源,1,6-己二胺作为胺化试剂,利用无模板的溶剂热方法制备了胺基功能化的磁性Fe3O4纳米粒子,并利用其键合叶酸分子,制备出表面修饰了叶酸的磁性Fe3O4复合纳米粒子。利用傅里叶变换红外光谱仪、X-射线衍射仪、透射电镜、差热-热重分析仪和振动样品磁强计对所得纳米粒子的形貌、粒径、化学组成和磁性能进行了表征。结果表明,叶酸分子通过化学键牢固键合在磁性纳米Fe3O4粒子表面,叶酸修饰的复合纳米粒子仍然具有良好的磁性能。     

Fe_3O_4纳米棒和Fe_2O_3纳米线的热氧化制备与表征

以铁单质和草酸溶液为原料,将0.75mol/L的草酸溶液滴在铁片上,于空气中200~600℃范围内加热1h,制备了Fe3O4纳米棒和Fe2O3纳米线,用扫描电镜(SEM)、X射线衍射仪(XRD)和透射电子显微镜(TEM)对产物进行表征,并研究了反应温度对产物形貌的影响.结果表明,在200~500℃下空气中反应1h在铁片上直接生长出矩形截面的多晶的立方相Fe3O4纳米棒,其直径范围约为0.5~0.8μm.当反应温度为600℃,得到的产物为六方相的Fe2O3纳米线.研究表明,C2H2O4对纳米棒的形成起关键作用,并提出了可能生长机理.     

聚丙烯酰胺修饰Fe_3O_4磁性纳米粒子的制备与表征

首先通过化学处理在Fe3O4磁性纳米粒子表面引入Si—H键,然后通过选择性的硅氢加成反应制备了一个端基带溴的磁性引发剂,并利用原子转移自由基聚合(ATRP)技术,在该磁性引发剂表面接枝了聚丙烯酰胺高分子,该聚丙烯酰胺高分子展现出分子量高度可控性和窄的分子量分布.经聚丙烯酰胺修饰后Fe3O4磁性纳米粒子的比饱和磁化强度为58.5 emu.g-1,与未修饰纳米Fe3O4相比下降约20%.     

纳米CdS修饰的恩诺沙星选择电极的研制与应用

制备了以纳米Cd S为修饰剂的涂丝型恩诺沙星离子选择电极,并利用透射电镜和X射线衍射技术对制得的纳米粒子进行表征。采用电位分析法对该修饰电极的各项性能进行了测定。纳米Cd S修饰电极的Nernst响应范围为1.0×10~(-2)~1.0×10~(-6)mol/L,级差电位为45 mV/pC,检出为7.4×10~(-7)mol/L;将电极应用于猪肉样品中恩诺沙星的检测,结果与标准方法对比无显著性差异。     

Fe_3O_4磁性纳米粒子的PEG修饰剂的合成与性能

采用共沉淀法制备了用柠檬酸包覆的Fe3O4磁性纳米粒子,为提高其生物环境适应性和生物应用,利用聚乙二醇二胺(NH2-PEG-NH2)通过碳二亚胺化学法进一步修饰,得到具有良好性能的磁性纳米粒子修饰剂,并分别用场发射扫描电子显微镜(SEM)、洛伦兹透射电子显微镜(TEM)、马尔文激光粒度仪、X-射线粉末衍射仪(XRD)、傅里叶变换红外光谱(FTIR)、综合热分析仪(TG/DTA)、振动样品磁强计(VSM)对磁性纳米粒子的表面形态、化学结构、晶体结构、热稳定性和磁性能进行了表征.在此基础上用合成的磁性纳米粒子修饰剂对盐酸阿霉素(DOX·HCl)进行了修饰,研究了修饰剂的载药和释药行为.结果表明,所制备的修饰剂近乎球形,尺寸相对均匀,粒径在15 nm左右,饱和磁化强度为68 A·m2/kg,在磁靶向药物运输中可以达到良好的磁响应性能.在水中的载药量达到83%,在p H=7.4和p H=5.0下,磁性纳米粒子载药盐酸阿霉素释放均是一个缓慢的过程,具有明显的缓释效果,此外,由于不同p H值下,DOX中的氨基质子化程度存在差异,在较低的p H值下质子化的氨基互相排斥,这更有利于DOX的释放,累计释药率在72 h后分别为65.8%(p H=7.4)与73.6%(p H=5.0).研究表明该磁性纳米粒子具有很好的载药能力及缓释效果.     

磁性纳米Fe_3O_4粒子与胰蛋白酶的相互作用

采用微波法得到磁性纳米Fe304粒子,利用XRD,TEM等方法对其粒径大小及形貌进行了表征,结果分析表明产物为纳米级,粒径大小均匀。利用紫外可见吸收光谱及荧光光谱等方法研究了磁性纳米Fe304粒子与胰蛋白酶的相互作用,探讨了纳米粒子对胰蛋白酶的结构及活性的影响。     

基于Fe_3O_4-Au磁性纳米粒子及碳纳米管修饰电极的对氧磷生物传感器研究

采用化学共沉淀技术制备磁性Fe3O4-Au纳米粒子复合物(Fe3O4-AuNPs),并以此磁性纳米复合物和碳纳米管(CNTs)构建用于快速检测对氧磷的乙酰胆碱酯酶(AChE)生物传感器。通过磁力作用将Fe3O4-AuNPs纳米粒子固定在自制的磁铁/玻碳电极(MGCE)上,并以此作为AChE的载体。分别通过X射线衍射、振动样品磁强和透射电镜表征了磁性纳米粒子复合物Fe3O4-AuNPs的成分、磁性及其形貌特征。利用电化学交流阻抗(EIS)、循环伏安法和微分脉冲伏安法(DPV)表征了自制的MGCE修饰电极以及生物传感器(AChE/Fe3O4-AuNPs/CNTs/MGCE)的电化学特征,建立了用该生物传感器微分脉冲伏安法检测对氧磷的方法。在最佳实验条件下,酶抑制率与对氧磷浓度的对数在3.6×10-6~2.9×10-2mol/L范围内呈线性关系,检出限为1.6×10-7mol/L。用提出的方法对实际水样中的对氧磷进行加标回收实验,回收率为98.0%~107%。     

纳米氧化锌修饰的涂丝型γ-氨基丁酸选择电极的研制与应用

制备了一种以纳米材料氧化锌(ZnO)为修饰剂的涂丝型γ-氨基丁酸选择电极,对其各项性能进行考察,并与普通涂丝型γ-氨基丁酸选择电极进行比较。该ZnO修饰电极的Nernst响应范围为8.9×10-7~1.0×10-1mol·L-1,极差电位为61mV/pC,检测限为6.2×10-7mol·L-1。与普通电极相比,此修饰电极的各项性能都显示出更佳的效果,检测下限更低,检测范围更广,响应时间更短,并能够更加快速、准确的检测发芽糙米中γ-氨基丁酸的含量,并且与分光光度法测得的结果相符。     

Preparation of carbon coated Fe3O4 nanoparticles for magnetic separation of uranium

Uranium(VI) was removed from aqueous solutions using carbon coated Fe₃O₄ nanoparticles (Fe₃O₄@C). Batch experiments were conducted to study the effects of initial pH, shaking time and temperature on uranium sorption efficiency. It was found that the maximum adsorption capacity of the Fe₃O₄@C toward uranium(VI) was ∼120.20 mg g⁻¹ when the initial uranium(VI) concentration was 100 mg L⁻¹, displaying a high efficiency for the removal of uranium(VI) ions. Kinetics of the uranium(VI) removal is found to follow pseudo-second-order rate equation. In addition, the uranium(VI)-loaded Fe₃O₄@C nanoparticles can be recovered easily from aqueous solution by magnetic separation and regenerated by acid treatment. Present study suggested that magnetic Fe₃O₄@C composite particles can be used as an effective and recyclable adsorbent for the removal of uranium(VI) from aqueous solutions.     

涂丝型盐酸地尔硫卓选择电极的研制与应用

研制了一种以盐酸地尔硫卓与碘汞酸盐缔合物为电活性物的涂丝型盐酸地尔硫卓选择电极,电极的线性响应范围1.0×10-3~1.0×10-5mol.L-1,级差电位为28 mV/pc,检测限为4.5×10-5mo.lL-1.该电极响应迅速,重现性好,用此电极以标准曲线法测定了盐酸地尔硫卓片剂的含量,结果与药典法相符.     

涂碳型PVC膜培氟沙星选择电极的研制

报道一种以盐酸培氟沙星与溴汞酸盐生成的分子缔合物为电活性物质的新型涂碳PVC膜培氟沙星选择电极。在pH 1 .5～ 4.5范围内 ,电极对培氟沙星的Nernst响应范围为 1 .0× 1 0 - 2 ～ 5 .0× 1 0 - 5mol/L ,检测限为 4.2× 1 0 - 6mol/L。方法的平均回收率为 98.5 % ,RSD为 1 .0 %     

Preparation, structure, and magnetic properties of polystyrene coated by Fe3O4 nanoparticles

A novel method of fabricating core-shell structure particles, comprising nearly monodisperse polystyrene (PS) spheres as cores and Fe3O4 as shells, is submitted. In this research, the magnetite (Fe3O4) shell was prepared by seeded growth from the reaction of FeCl2 with diethylene glycol (DEG) in aqueous solutions. The thickness of the shell were controlled in the range of 0-60 nm by using slow injection. The composition and the structure of the shell were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetric analysis (TG), and vibrating-sample magnetometry (VSM). It is found that there are some differences between the magnetic composite spheres shelled with Fe3O4 and pure Fe3O4 particles, such as the size of the magnetites and the ferromagnetic property. Furthermore, the spheres exhibited the superparamagnetic characterization when the thickness of the Fe3O4 shell was less than 15 nm.     

微波法制备纳米Fe3O4

纳米Fe3O4由于具有较高的表面活性和磁性能,以及纳米微粒特有的小尺寸效应、表面效应、量子效应、催化、发光特性等[1],在颜料印刷、磁流体、磁记录、催化、机械、电子等领域得到了广泛的应用[1,2]。目前,已报道的制备纳米Fe3O4的方法有很多,如:化学共沉淀法[3],微乳液法[4,5],     

Electrochemical myoglobin biosensor based on carbon ionic liquid electrode modified with Fe3O4@SiO2 microsphere

In this paper, a Fe₃O₄@SiO₂ core-shell structure microsphere was synthesized and used to investigate the direct electron transfer of myoglobin (Mb) with a 1-butylpyridinium hexafluorophosphate based carbon ionic liquid electrode (CILE) as the substrate electrode. The mixture of Mb and Fe₃O₄@SiO₂ microsphere could form an organic–inorganic composite, which was immobilized on the surface of CILE with a chitosan (CS) film. Cyclic voltammetric experiments indicated that a pair of well-defined quasi-reversible redox peaks appeared on CS/Mb-Fe₃O₄@SiO₂/CILE with the formal peak potential (E ^0′) located at ?0.31 V (vs. saturated calomel electrode), which was corresponded to the electroactive center of Mb heme Fe(III)/Fe(II) redox couples. Direct electrochemical behaviors of Mb in CS-Fe₃O₄@SiO₂ composite film were carefully investigated with the electrochemical parameters calculated. The CS/Mb-Fe₃O₄@SiO₂/CILE showed good electrocatalytic behaviors to the reduction of trichloroacetic acid in the concentration range from 0.2 to 11.0 mmol L^?1 with the detection limit of 0.18 mmol L^?1 (3σ). Based on CS/Mb-Fe₃O₄@SiO₂/CILE, a new third-generation reagentless electrochemical biosensor was constructed with higher sensitivity and reproducibility.     

Preparation and cell response of bio-mineralized Fe3O4 nanoparticles

Silk fibroin (SF)-coated Fe(3)O(4) nanoparticles (NPs) with good superparamagnetism were successfully prepared via a bio-mineralization process at room temperature. Two cell tests revealed that mineralized SF-coated Fe(3)O(4) NPs presented good cytocompatibility for L929 and osteoblast cells and higher cell density after 5 d with high concentrations of SF-coated Fe(3)O(4) NPs (up to 0.5 mg/mL). These resulted from SF surface coating on NPs, nano-surface morphology and iron ion release of Fe(3)O(4) NPs. The mineralized SF-coated Fe(3)O(4) NPs could be envisioned for various bone orthopedic and therapeutic applications, in which SF-coated NPs location is controlled through an external magnetic field to promoted bone growth.     

Determination aminopyrine in pharmaceutical formulations based on APTS-Fe3O4 nanoparticles modified glassy carbon electrode

In this work, 3-aminopropyltriethoxysilane modified Fe₃O₄ nanoparticles (ATPS-Fe₃O₄) were used to modify glassy carbon electrode for aminopyrine determination. ATPS-Fe₃O₄ showed obviously catalytic activity and adsorptivity towards aminopyrine oxidation proven by the increased oxidation peak current and the decreased oxidation peak potential. The best analytical response was obtained by immobilizing 8 μL 3 mg/mL APTS-Fe₃O₄ dispersion with an accumulation time of 200 s at −0.2 V in 0.1 M phosphate buffer solution (pH 9.0). The oxidation peak current of aminopyrine showed linear relationship with its concentration in the range from 0.5 to 100 and 100 to 1600 μM. The detection limit was 0.1 μM (S/N = 3). The proposed method showed satisfactory repeatability and anti-interference ability. The fabricated electrode was successfully applied to determine aminopyrine in pharmaceutical formulations.     

A lead(II) sensor based on a glassy carbon electrode modified with Fe3O4 nanospheres and carbon nanotubes

We have developed a highly sensitive and selective sensor for lead(II) ions. A glassy carbon electrode was modified with Fe₃O₄ nanospheres and multi-walled carbon nanotubes, and this material was characterized by scanning electron microscopy and X-ray diffraction. The electrode displays good electrochemical activity toward Pb(II) and gives anodic and cathodic peaks with potentials at ?496 mV and ?638 mV (vs. Ag/AgCl) in pH?6.0 solution. The sensor exhibits a sensitive and fairly selective response to Pb(II) ion, with a linear range between 20 pM and 1.6 nM, and a detection limit as low as 6.0 pM (at a signal-to noise ratio of 3). The sensor was successfully applied to monitor Pb(II) in spiked water samples.

盐酸依匹斯汀PVC膜电极的研制及应用

以四苯硼酸钠与盐酸依匹斯汀生成的离子缔合物为电活性物质,研制了盐酸依匹斯汀PVC膜选择性电极。在pH 5的HCl-NaOH溶液中,电极的线性范围为6.3×10-7~1.0×10-1mol/L,斜率为49 mV/pC(10℃),检出限为1.89×10-7mol/L。应用此电极测定药物中盐酸依匹斯汀含量,RSD3%,回收率为97.5%~100.2%。