微型反应器液相产物中C1￣C5烃分析系统及方法研究

本文介绍了一个适于终沸点为４００℃或更高的微型反应器液相产物中Ｃ１￣Ｃ５烃全组成分析的专用分析系统和分析方法。系统由六通阀、顶柱和分析柱组成，所有组件均置于同一色谱炉内，采用ＦＩＤ检测外标法定量。分析结果相对标准偏差小于１０％。半年来的应用结果表明，该系统及方法具有操作简便，定量结果准确，适用范围宽，连续运行周期长等特点，可以用于各类宽镏分样品中Ｃ１￣Ｃ５烃的全组成分析。     

微型反应器液相产物中C1～C5烃分析系统及方法研究

本介绍了一个适于终沸点为４００℃或更主的微型反应器液相产物中Ｃ１－Ｃ５烃全组成分析的专用分析系统和分析方法。系统由六通阀、预柱和分析柱组成，所有组件均置于同一色谱炉内，采用ＦＩＤ检测外标法定量。分析结果相对标准偏差小于１０％。半年来的应用结果表明，该系统及方法具有操作简便，定量结果准确，适用范围宽，连续运行周期长等特点，可以用于各类宽镏分样品中Ｃ１－Ｃ５烃的全组成分析。     

微型整体分析系统法及其进展

介绍了一种与微电子技术及微制造技术相关的微型整体分析系统,主要是有关以电渗流为基础的微型流动注射分析系统的发展。讲述了产生的原因和仪器的制备,近几年的发展,未业的发展趋势和应用。     

微型机电系统在物化分析中的应用

介绍了微型机电系统（ＭＥＭＳ）的基本概念，发展简史和主要特点。详细讨论了ＭＥＭＳ在化学分析中的应用，指出ＭＥＭＳ技术使化学分析仪器微小型化、性能提高，同时还降低了仪器和实验的成本。最后简要介绍了微小型化学分析仪器的支撑技术。     

微型全分析系统

系统阐述了分析化学新兴研究领域微型全化学分析系统（μ－ＴＡＳ）的概念和原理,并对其应用现状及发展趋势进行了综述。     

含微混合器的微芯片设计和性能研究

微型化分析系统是分析化学的新兴研究领域，研究中设计制作的微芯片，由按层流原理设计制作的交叉分液汇合式微混合器及长反应管道组成。两种荧光染料混合实验可以直观地观测到微混合器的混合效果，而对Ｈｇ＾２＋－若丹明Ｂ的荧光猝灭反应的标准曲线法定量分析表明该设计的微芯片可应用于化学反应过程的定量测试。该微芯片在化学与生化分析和合成等分析检测领域具有巨大的潜在应用价值。     

微型化快速病原体检测生物分析装置的研制

研制一种能够快速检测和筛选细菌以及病毒微生物,并且能够对动物体内致病载体进行现场监测的完整的微分析装置具有十分重大的意义.这种便携式的生物分析系统不需要繁杂的仪器设备就能进行复杂的生物样品分析,并由一般的未经训练的个体在短时间内完成操作过程.     

微型滴定分析装置的研究

微型滴定分析装置的研究朱兵吴倩（华东师范大学化学系上海２０００６２）一、微型滴定装置的设计制作和特点在设计制作微型试剂滴瓶、电解装置、焰色反应器、固液分离器和定量加液管等多种微型器件的基础上［１，２］，设计制作能规范操作的微型滴定分析装置，其主要部件...     

微型全化学分析系统及技术进展

对微型全化学分析系统(μ-TAS)的发展现状及其应用领域进行了综述,对μ-TAS在毛细管电泳微型化、DNA及生化分析、组合化学研究等领域的应用研究作了重点介绍.     

微型滴定法在苯甲酸衍生物分析中的应用

本文报道WD—COⅡ微型滴定管在苯甲酸衍生物分析中的应用，所得结果与常规分析方法一致，并能有效地减少环境污染、节省试剂，具有推广应用价值。     

碳苷研究 V: 用Grignard试剂合成取代苯酚中酚羟基的保护及脱保护

本文报道了一些取代苯酚的合成, 并探讨了用Grignard试剂合成取代苯酚中酚羟基的保护及脱保护的问题. 利用苄基和甲基作为酚羟基的保护基, 对文献报道的切断醚键脱保护方法进行了评价. 找到了两种新体系能在更温和条件下切断醚键的方法, 指出了它们的适用条件. 实验结果符合硬软酸碱理论.     

Preparation and properties of polyurethane networks based on α,ω-difunctional poly(hexafluoropropylene oxide)

Poly(hexafluoropropylene oxide), poly(HFPO), networks were prepared from functional polymers by end linking via urethane groups. The prepolymers were characterized by NMR spectroscopy and GPC. The networks were characterized by determination of the number of network chains from the shear modulus, and were snown to contain both trifunctional crosslinks and difunctional links. The properties of the networks were investigated by a range of techniques. Compared with fully-fluorinated networks formed via triazine cross-links, investigated previously, the urethane-linked networks were more readily prepared but were poorer elastomers, were less thermally stable, and were less resistant to swelling by common polar solvents. © 1995 John Wiley & Sons, Inc.     

南瓜籽烘烤前后化学成分的分析

对烘烤前后南瓜籽中的化学成分进行分析并对比。采用同时蒸馏萃取装置萃取南瓜籽中的挥发性成分,采取超临界CO2萃取技术萃取南瓜籽油脂,并将其分为酸、碱、中性三个部分,用气相色谱-质谱联用方法分析其中化学成分并进行对比。结果表明,南瓜籽挥发性成分中含有多种醛类和酯类化合物,烘烤后产生了大量的烷基吡嗪,其在碱性部分中的相对含量比烘烤前提高14倍多,不饱和醛类化合物含量也有明显提高。南瓜籽油脂中的主要化学成分是油酸、亚油酸及其酯类。还含有生物活性功能成分如植物甾醇、角鲨烯和维生素E等。烘烤后除角鲨烯含量有所降低,维生素E、植物甾醇、亚麻酸等均有提高。     

FT-IR, FT-Raman spectra, density functional computations of the vibrational spectra and molecular geometry of biomolecule 5-aminouracil

FT-IR and FT-Raman spectra of the biomolecule 5-aminouracil were recorded in the regions 400–4000 cm⁻¹ and 10–3500 cm⁻¹, respectively. The observed vibrational wavenumbers were analyzed and assigned to different normal modes of vibration of the molecule. Density functional calculations were performed to support wavenumber assignments of the observed bands. A comparison with the molecule of uracil was made, and specific scale factors were employed in the predicted wavenumbers of 5-aminouracil. With the purpose of study the important molecule 5-aminouracil, its equilibrium geometry and harmonic wavenumbers were calculated for the first time by the B3LYP DFT method. The vibrational wavenumbers were compared with IR and Raman experimental data. Also good reproduction of the experimental wavenumbers is obtained and the % error is very small. All the tautomeric forms of 5-aminouracil were determined and optimized. The dimer forms were also simulated. The energy, atomic charges and dipole moments were discussed and several general conclusions were underlined.     

幼儿身高、体重和头发、血液锌铅含量关系的研究

同步检测了151例3-4岁健康幼儿的身高、体重以及头和全血中的锌、铅含量。研究了身高、体重和锌、铅含量的关系,指出无论是发锌或血锌含量与身高、体重多数呈正相关,但发铅与身高、体重主要呈负相关,血铅与身高、体重的关系较为复杂,多为非线性的二次函数关系。     

Gas chromatography-olfactometry analysis of the volatile compounds of two commercial Irish beef meats

The volatile flavour compounds of two commercial Irish beef meats (labelled as conventional and organic) were evaluated by gas chromatography-olfactometry and were identified by gas chromatography-mass spectrometry. The volatile compounds were isolated in a model mouth system. Gas chromatography-olfactometry was performed by a group of eight assessors using the detection frequency methodology. The odours of the detected compounds were described as well. Eighty-one volatile compounds were identified, 11 compounds of which possessed odour activity in the first beef sample and 14 of which in the second meat sample. Ten volatile flavour compounds were common to both: methanethiol, dimethyl sulphide, 2-butanone, ethyl acetate, 2- and 3-methylbutanal, an unknown compound, 2-octanone, decanal and benzothiazole. Two unknown compounds were only detected in the first sample while 2,3-pentanedione, 4-methyl-3-penten-2-one, 2-heptanone, dimethyl trisulphide and nonanal were only perceived in the second beef. Significant differences in terms of detection frequency, odour characteristics and in nature of the volatile flavour compounds were emphasised between the two samples.     

玩具、铅笔中可溶性砷、锑、硒的形态分析

对玩具、铅笔中可溶性砷、锑、硒的形态分析方法进行了研究,对原子荧光光谱法测定不同价态砷、锑、硒的方法进行了优化,建立了砷、锑、硒的原子荧光光谱形态分析方法。该方法样品加标回收率为82.0%~110.0%,测定结果的相对标准偏差为1.35%~2.22%(n=10)。     

Mg/Al型水滑石吸附硼的实验研究

采用共沉淀法制备了几种不同摩尔比的镁铝水滑石(LDHs),并对其进行了XRD、FT-IR表征.将其应用于吸附溶液中的硼,比较了它们对硼的吸附容量,最终选择了具有较高吸附容量的Mg4Al-LDH作为硼吸附荆.对Mg4Al-LDH吸附硼的实验条件进行了系统研究,得到了较高吸附容量下的实验条件.试验结果表明该等温吸附过程可用Langmuir吸附等温模型准确描述.     

Synthesis,characterization, and antimicrobial activity of some novel poly(ether ketone)s

Low molecular weight poly(ether ketone)s were synthesized from phenol, 1,4‐phenylenedioxy diacetylchloride, chloroacetylchloride, and dichloroalkanes [1,2‐dichloroethane and dichloromethane] by a Friedel–Crafts reaction with anhydrous aluminum chloride as a catalyst and carbon disulfide as a solvent. The conditions for the preparation of the poly(ether ketone)s and the chlorine contents obtained with the Carius method were examined, and a reaction scheme for each resin was established. The molecular weights and polydispersities of the resins were obtained by gel permeation chromatography. The polyketones were characterized by IR spectroscopy. The characteristic frequencies due to different functional groups were assigned. The thermal properties of the resins were studied with thermogravimetry and differential scanning calorimetry. The characteristic temperatures of thermal degradation for the poly(ether ketone)s were evaluated with thermogravimetric analysis. The kinetic parameters for the decomposition reactions of the resins were obtained with Broido and Doyle's method, and the heats of fusion were obtained from differential scanning calorimetry thermograms. The polyketones were thermally stable up to 200 °C. All the polyketones were tested for their microbial properties against bacteria, fungi, and yeast. The effect of poly(ether ketone)s on the growth of these microorganisms was investigated, and the polyketones were found to inhibit the growth of the microorganisms to a considerable extent. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 2335–2344, 2003     

云南菊科中草药中铅含量特征分析

论述了云南２７种菊科中草药及其水提取物中铅含量的特征。菊科植物及水提物中铅含量的频数分布为正偏态,两者的相关系数ｒ＝０．０９,未呈现显著的线性相关。提取率较高的山紫苑、佩兰、木香铅实际含量低;铅含量高的叶下花、狭叶兔耳风、臭灵丹提取率又较低,减少了人体对Ｐｂ的过量摄入。