抗CD4单抗-PAP免疫毒素对T淋巴母细胞样CEM细胞的体外效应

【目的】构建抗CD4单克隆抗体-商陆抗病毒蛋白(PAP)免疫毒素(抗CD4-PAP),分别在体外测定其对T淋巴母细胞样细胞CEM和对照Raji细胞的细胞毒杀伤效应。【方法】以SPDP为交联剂,将纯化的抗CD4单抗与商陆抗病毒蛋白交联成抗CD4-PAP免疫毒素,在体外分别与CEM和Raji细胞进行杀伤试验。【结果】10-9mol/L抗CD4-PAP对CEM细胞产生的细胞毒效应约为60%,而对Raji细胞的细胞毒效应低于10%。抗CD4-PAP免疫毒素在体外对骨髓单个核细胞的CFU无抑制效应,【结论】抗CD4-PAP免疫毒素对T淋巴母细胞样CEM有明显的抑制效应,可能替代抗CD3单抗作为器官移植抗排斥反应及导向免疫治疗T淋巴细胞白血病的临床治疗研究。

ISP and PAP4 peptides promote motor functional recovery after peripheral nerve injury

Both intracellular sigma peptide(ISP) and phosphatase and tensin homolog agonist protein(PAP4) promote nerve regeneration and motor functional recovery after spinal cord injury. However, the role of these two small peptides in peripheral nerve injury remains unclear. A rat model of brachial plexus injury was established by crush of the C6 ventral root. The rats were then treated with subcutaneous injection of PAP4(497 μg/d, twice per day) or ISP(11 μg/d, once per day) near the injury site for 21 successive days. After ISP and PAP treatment, the survival of motoneurons was increased, the number of regenerated axons and neuromuscular junctions was increased, muscle atrophy was reduced, the electrical response of the motor units was enhanced and the motor function of the injured upper limbs was greatly improved in rats with brachial plexus injury. These findings suggest that ISP and PAP4 promote the recovery of motor function after peripheral nerve injury in rats. The animal care and experimental procedures were approved by the Laboratory Animal Ethics Committee of Jinan University of China(approval No. 20111008001) in 2011.

HPLC-UV法测定皮肤给药后大鼠血浆5-(4-苯氧丁氧基)补骨脂素浓度

目的:建立大鼠血浆中5-(4-苯氧丁氧基)补骨脂素[5-(4-phenoxybutoxy)psoralen,PAP-1]高效液相色谱-紫外(HPLC-UV)测定方法,并用于大鼠皮肤给药后血浆PAP-1浓度的测定。方法:以异欧前胡素为内标,血浆样品经乙酸乙酯提取;应用Ultimate Column AQ-C18色谱柱(150 mm×4.6 mm,5μm);流动相为甲醇-水(75:25),流速0.8 mL/min,检测波长311 nm;采用PAP-1与内标峰面积比值进行定量。大鼠皮肤给药PAP-1,检测不同时间血药浓度。结果:本方法最低检测限为5.3μg/L(S/N>10),线性范围为5.3～2120μg/L,血浆中PAP-1的日内和日间精密度为2.3%～6.0%,准确度为102%～105%,回收率为83.1%～86.5%。大鼠15 mg/kg皮肤给药后,PAP-1在4 h达峰。雄性和雌性大鼠的AUC分别为256和1209μg.L-1.h,Cmax分别为74和225μg/L。结论:本方法专属性强、简便高效,可用于测定药物代谢动力学实验中PAP-1的浓度。本文首次报道大鼠PAP-1皮肤给药的药物动力学过程,药代参数存在明显的性别差异。

Permselectivity of 4－Aminophenol，Paracetanol and Phenacetin on the Self－Assembled n－Alkanethiol Monolayer Modified Gold Electrode

The gold electrodes coated by n-alkanethiol with various chain lengths were used to study the permeability of uric acid,ascorbic acid,4-aminophenol,paracetanol and phenacetin by means of linear sweep voltammetry.The results show that the optimum chain length is n=10.The improvements in the selectivity and the stability of the amperometric detection of these compounds in a flow stream were obtained by n-alkanethiol self assembled monolayers modified electrodes based on their differences in the hydrophobicity and the permeability.

Determination of tetraethyl ammonium by ion-pair chromatography with indirect ultraviolet detection using 4-aminophenol hydrochloride as background ultraviolet absorbing reagent

A method was developed for the determination of tetraethyl ammonium （TEA） by reversed-phase ion- pair chromatography with indirect ultraviolet detection, Chromatographic separation was achieved on a reversed-phase C18 column using background ultraviolet absorbing reagent - ion-pair reagent - organic solvent as mobile phase. The effects of the background ultraviolet absorbing reagents, detection wavelength, ion-pair reagents, organic solvents and column temperature on the determination method were investigated and the retention rules discussed. Results found that TEA could be successfully analyzed by using 0.7 mmol/L 4-aminophenol hydrochloride and 0.15 mmol/L 1-heptanesulfonic acid sodium mixed with 20% （v/v） methanol as mobile phase at a UV detection wavelength of 230 nm. Under these conditions, the retention time of tetraethyl ammonium was 2.85 min. The detection limit （S/N = 3） for TEA was 0.06 mg/L. The relative standard deviations （n = 5） for peak area and retention time were 0.35% and 0.02%, respectively. The method has been successfully applied to the determination of synthesized tetraethyl ammonium bromide. Recovery of tetraethyl ammonium after spiking was 99.1%.

Determination of Constituents in Hair Dyes by Reversed-phase High-Performance Liquid Chromatography

A reversed-phase high-performance liquid chromatographic method for the separation and quantitation of 1,4-phenylenediamine, 4-aminophenol, 3-aminophenol, 1,3-benzendiol and 2,6-phenylenediamine in hair dyes was developed. The separation was carried out on a mu-Bondapak C-18 column with methanol-water containing 0.1% triethylamine and 0.02 mol/L NH4Ac (pH=5.20) (10:90. vol./vol.) as the mobile phase. Two real samples were analyzed.

Degradation of 4-aminophenol by hydrogen peroxide oxidation using enzyme from Serratia marcescens as catalyst

This paper reports on the degradation of 4-aminophenol using hydrogen peroxide as oxidizer and the enzyme from Serratia marcescens AB 90027 as catalyst.The effecting factors during degradation and the degrading mechanism were studied.Also,the location of the enzyme in the cell,which could catalyze the degradation of 4-aminophenol,was analyzed.The results showed that to degrade 50 mL of 4-aminophenol whose concentration was 500 mg/L,the optimal conditions were:volume of H_(2)O_(2)=3 mL,temperature=40-60°C and pH=9-10.In the degra-dation process,4-aminophenol was first converted to benzo-quinone and NH3,then organic acids including maleic acid,fumaleic acid,and oxalic acid were formed,and then finally CO_(2) and H2O were generated as final products.The enzyme that could catalyze the degradation of 4-aminophenol was mainly extracellular enzyme.

Modification on Synthesis of Mixed Ligand Chelates by Using Di- and Trivalent Transition Metal Ions with Schiff Base as Primary Ligand

New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand, whereas 2-nitroaniline (L2) represents the secondary ligand in a molar ratio of M:L1:L2 [1:1:1]. The synthesized Schiff base and chelates have been characterized by using several tools, such as, elemental analysis, molar conductivity, magnetic moment measurements, infrared and electronic spectra. The mass spectra of the ligands and Ni(II) chelate were used to justify the process of modification, as well as, the electron paramagnetic resonance spectrum which was carried out for Cu(II) chelate all in order to elucidate the chemical and geometrical structure of the chelates. On the basis of the obtained data, the geometry of the products was proposed for all the chelates.

Structural and mechanistic understanding of an active and durable graphene carbocatalyst for reduction of 4-nitrophenol at room temperature

The development of an active, durable, and metal-free carbocatalyst that is able to replace metal-based catalysts is of increasing scientific and technological importance. The use of such a catalyst would avoid problems caused by metal- containing catalysts, for example, environmental pollution by heavy metals and depletion of rare metal resources. Herein, an active and durable graphene carbocatalyst is presented for the carbocatalytic conversion of 4-nitrophenol to 4-aminophenol at ambient temperature. The carbocatalyst was prepared via a mild, water-based reaction between L-ascorbic acid （AA） and graphene oxide （GO） and did not involve any other reactants. During the structure and catalytic property optimization, a series of carbocatalysts were fabricated at various reaction temperatures and AA/GO ratios. Using several characterization techniques, detailed structural features of these carbocatalysts were identified. Possible active species and sites on the carbocatalysts were also identified such as certain oxygen-containing groups, the ~x-conjugated system, and graphene sheet edges. In addition, the synergistic effect between these active species and sites on the resulting catalytic activity is highlighted. Furthermore, we clarified the origin of the high stability and durability of the optimized carbocatalyst. The work presented here aids the design of high-performance carbocatalysts for hydrogenation reactions, and increases understanding of the structural and mechanistic aspects at the molecular level that lead to high catalyst activity and durability.

Reduction of 4-Nitrophenol Using Ficin Capped Gold Nanoclusters as Catalyst

Conversion of nitroarenes to aminoarenes has attracted great attention in pharmaceutical industry, agricultural production, environmental protection and chemical catalysis area. In this work, ficin capped gold nanoclusters(ficin@AuNCs) were prepared for the reduction of 4-nitrophenol to 4-aminophenol.The proposed catalyst was characterized by transmission electron microscopy,dynamic light scattering, fluorescence spectra and UV-Vis spectra. With NaBH4 as the reducing agent, the reduction reaction could carry out completely within 10 min at 25 ℃. Interestingly, the resultant catalyst exliibited size-related properties in the reduction, smaller ficin@AuNCs exhibited liigher catalytic activity. Its present pseudo-first-order rate constant was found to be 2.95×10^-3 s^-1 and the catalytic activation energy was 27.7 kJ/mol. Moreover, ficin@AuNCs-based catalyst displayed good stability, heading to 4-nitrophenol conversion of 98.5%-100.0% after six consecutive cycles. It has shown a great potential in construction of unique catalysts based on AuNCs for reduction reaction.

对乙酰氨基酚及其水解产物在碳糊电极上的电化学行为及同时测定

目的:研究对乙酰氨基酚(ACOP)和对氨基酚(PAP)在碳糊电极上的电化学行为;建立同时测定ACOP和PAP含量的电化学分析新方法。方法:采用循环伏安法研究ACOP和PAP在碳糊电极上的电化学行为,以差示脉冲伏安(DPV)对两者含量进行测定。结果:在pH 6.0磷酸盐缓冲液(PBS)中,ACOP氧化峰电流与其浓度在5.0×10-7～1×10-4mol.L-1范围内呈良好的线性关系,PAP氧化峰电流与其浓度在1.0×10-7～1.0×10-4mol.L-1范围内呈良好的线性关系,检测限分别为1.0×10-7mol.L-1和5.0×10-8mol.L-1。结论:该电极可以对ACOP和PAP进行单独或同时的测定,并用于实际样品对乙酰氨基酚片中对乙酰氨基酚的含量检测。本法操作简单、快速、灵敏、准确,可为对乙酰氨基酚片药物质量的控制和检测提供了一种简便的方法。