GC—MS3100检测盐酸克伦特罗

针对近期食品安全事件频发,特别是某著名品牌肉制品含有瘦肉精事件,为配合有关部门执法,参考农业部1025号公告-16—2008（动物尿液中盐酸克伦特罗残留检测气相色谱质谱法》,使用3100型GC—MS检测盐酸克伦特罗（瘦肉精）,对配制的盐酸克伦特罗标准溶液系列进行测定。     

生物传感器及其在食品检测中的应用进展

随着人们对食品安全重视程度的不断加大,食品安全检测发展十分迅速。在食品安全检测中,传感器检测技术是一项快捷、灵敏以及低廉的食品安全检测技术,由于其存在如上优点,生物传感器已经逐渐发展成为农副产品质量快速检测与鉴定的一个研究重点。本文主要基于生物传感器的基本概念、基本工作原理,着重阐述了生物传感器发展的三个阶段,综述了生物传感器在食品安全检测之中的应用情况,并对其未来的发展提出一些建议。     

生物传感器在食品安全检验中的应用前景

生物传感器技术是现代生物技术的一种先进检测与监控方法，本文重点阐述了生物传感器在食品安全检验中的应用现状及发展趋势。     

实验室动态

上海市计量院一项目通过验收日前,上海市计量院承担的国家质检总局科研项目"猪尿冻干粉中克伦特罗标准物质的研制"项目通过验收,专家认定该研究成果具有新颖性和重要的实际应用价值,综合技术达到国际先进水平。该项目成果可应用于克伦特罗酶联免疫试剂盒、克伦特罗检测新方法的评价、克伦特罗残留检测过程的质量控制,保障盐酸克伦特罗现场快速分析的准确     

上海市计量院一项目通过验收

日前,上海市计量院承担的国家质检总局科研项目“猪尿冻干粉中克伦特罗标准物质的研制”项目通过验收。专家认定该研究成果具有新颖性和重要的实际应用价值,综合技术达到国际先进水平。该项目成果可应用于克伦特罗酶联免疫试剂盒、克伦特罗检测新方法的评价、克伦特罗残留检测过程的质量控制,保障盐酸克伦特罗现场快速分析的准确有效。     

酶联免疫吸附法测定猪肉中的“瘦肉精”

本文介绍了酶联免疫吸附法测定猪肉中的盐酸克伦特罗的方法。利用盐酸克伦特罗试剂盒,对猪肉组织中的盐酸克伦特罗残留经抽提、竞争后,用酶标仪进行检测分析。此法较适用于现场检验,检测速度快、灵敏度高,是保证肉品卫生安全的较好监控方法。     

基于二氧化硅球腔阵列的葡萄糖传感器研究

在二氧化硅球腔阵列电极上,通过电沉积普鲁士蓝和直接吸附葡萄糖氧化酶,制备了一种新型葡萄糖生物传感器。该传感器对酶催化反应产物过氧化氢的选择性催化还原特性可实现对葡萄糖的检测,实验结果表明,传感器的最佳工作电位是－0．3V,测试溶液的最佳pH值为6．0。在选定的工作条件下,传感器的线性范围为2．49×10-5－2．42×10-3mol／L,检测极限值为7．2×10-6mol／L（S／N=3）,米氏常数为1．136mmol／L。该方法制备的生物传感器能有效降低干扰,具有潜在的应用价值。     

猪尿冻干粉中盐酸克伦特罗标准物质的研制

研制一套4种浓度水平的猪尿冻干粉中盐酸克伦特罗标准物质,以健康安全的猪尿作为空白基体,利用添加的方法,经过均匀性和稳定性检验,由8家实验室采用液相色谱-串联质谱法对该套标准物质进行协同定值,并进行不确定度评估。结果表明该套标准物质均匀性良好,在4℃条件下保存稳定性在1年以上,标准物质中CLB的含量及不确定度分别为:0.65±0.15,1.28±0.44,3.78±0.46,11.5±1.8ng/mL(k=2)。该标准物质可应用于猪尿中盐酸克伦特罗检测过程的方法验证和检测结果质量控制等。     

酶联免疫吸附法测定猪肉中的"瘦肉精"

本文介绍了酶联免疫吸附法测定猪肉中的盐酸克伦特罗的方法。利用盐酸克伦特罗试剂盒，对猪肉组织中的盐酸克伦特罗残留经抽提、竞争后，用酶标仪进行检测分析。此法较适用于现场检验，检测速度快、灵敏度高，是保证肉品卫生安全的较好监控方法。     

荧光金纳米簇对克伦特罗的灵敏检测研究

基于BSA保护的金纳米簇在不同激发波长下的不同发射峰以及盐酸克伦特罗(CLB)对金纳米簇不同激发波长下荧光强度的影响,建立了一种简单、快速、的测定CLB的高选择性、高灵敏度的荧光分析方法。根据重氮化的CLB对双波长的响应,对CLB的检测限达到了1×10~(-8)mol/L。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.