一种新的PEG凝聚人血清白蛋白液相压电免疫传感器

以ＰＥＧ为乳剂，建立了一种基于ＰＥＧ凝集的液相压电免疫分析法，并用于人血清白蛋白（Ａｌｂ）的测定。详细考察了ＰＥＧ浓度，抗体稀释度、ＰＥＧ分子量及反应温度等因素对频移的影响，采用终点法和初始速率法测得Ａｌｂ线性范围分别为４７．８３－１０３．１ｍｇ／Ｌ和４０．６２－１０１．２ｍｇ／Ｌ。对７个血清样本的分析，其结果与双缩脲法基本一致。用一简单的方法合晶振再生后可获得重视的结果。     

表面等离子体共振法检测人血清白蛋白抗体活性

表面等离子体共振法是研究生物大分子间相互作用的有效方法之一,和非直接方法（如酶联免疫）相比,具有实时、快速和免标记等特点。我们在甲羧基化葡聚糖修饰的传感片表面直接交联固一人血清白蛋白（ＨＳＡ）,用于ａｎｔｉ－ＨＳＡ抗体活性的检测,并用Ｈ３ＰＯ４（０．１ｍｏｌ／Ｌ）溶液再生。结果表明表面等离子体共振（ＳＰＲ）生物传感器能快速实时检测ａｎｔｉ－ＨＳＡ抗体的活性,且传感片能够重复使用１００次以上。     

流动注射双硫腙在线共沉淀预浓集石墨炉原子吸收光谱法测定人血中微量镉

本文用流动注射分析技术为石墨炉原子吸收光谱法测定人血中超微量金属元素建立了一个有效的在线共沉淀分离预浓集系统。基于痕量镉与双硫腙(DTZ)在弱酸性水溶液中共沉淀。沉淀收集在一编结反应器及一微型过滤器上,用60μL甲基异丁基酮(MIBK)溶洗沉淀,然后送入石墨炉进行测定。分析速度24样/h,样品消耗为1.4mL,获得的富集倍率为11。检出限(3σ)为0.003μg/L,浓度为0.06μg,/L镉时,测定精度为2.6%(n=7),测定人体血样标准参考物(GBW09132～GBW09134)中镉,结果与标准值一致。     

利用光生物传感器研究阳离子卟啉与人血清白蛋白的相互作用

An optical biosensor with a stirred cuvette has been used to monitor the interaction between immobilized human serum albumin （HSA） and three water-soluble cationic porphyrins. The binding constants at 25℃ obtained from biosensor analysis were compared with those from fluorescence spectroscopy. The interactions were further investigated at temperatures from 15℃ to 30℃. The thermodynamics parameters, changes of free energy （△G）, enthalpy （△H） and entropy （△S）, were evaluated from equilibrium data. It appeared that the binding process was governed primarily by electrostatic forces.     

探针技术石墨炉原子吸收光谱测定人发中痕量铅

探针技术石墨炉原子吸收光谱测定人发中痕量铅周立群＊蔡火操葛伊莉张必成（湖北大学实验中心武汉４３００６２）（湖北大学化学系武汉）关键词石墨探针，石墨炉原子吸收光谱，痕量铅，人发１９９６－１０－１６收稿，１９９７－０４－２２修回大量研究表明，人体很多疾病...     

人红细胞摄入 Eu(Cit)23-阴离子通道机制的研究

研究了Eu(Cit)2^3-进入人红细胞的机制。在人红细胞与含不同浓度的Eu(Cit)2^3-的等渗缓冲液温育后。用ICP－MS测定胞浆及膜中Eu的含量，并考察了阴离子通道抑制剂DIDS，温度及pH的影响，制备了人红细胞膜正面向外囊泡（ROV）和内翻包囊泡（IOV）并研究了它们对Eu(Cit)2^3-的摄取及DIDS的影响。结果表明，Eu(Cit)2^3-可以与细胞膜结合并进入红细胞内，DIDS强烈抑制红细胞对Eu(Cit)2^3-的摄入；温度，pH对细胞摄入有显著影响，ROV和IOV可以摄入Eu(Cit)2^3-，但DIDS只抑制ROV的摄入，对IOV的摄入无影响。Eu(Cit)2^3-进入人红细胞具有阴离子通道机制的各种特征。阴离子通道是稀土柠檬酸络合物Eu(Cit)2^3-进入红细胞的途径之地。     

Bilirubin Removal from Human Plasma with Albumin Immobilised Magnetic Poly(2‐hydroxyethyl methacrylate) Beads

Bioaffinity separation has a unique and powerful role as a support tool in the removal of toxic substances from human plasma. Magnetic beads have advantages as supports in comparison to conventional nonmagnetic beads because of low pressure drop, high mass transfer rates, and good fluid‐solid contact. In addition, they eliminate internal diffusion limitations. Human serum albumin (HSA) immobilised onto magnetic poly(2‐hydroxyethyl methacrylate) (mPHEMA) beads were investigated as an adsorbent for the selective bilirubin removal from human plasma. The mPHEMA beads were prepared by a modified suspension polymerisation. HSA was covalently coupled to the mPHEMA beads. Bilirubin adsorption was investigated from hyperbilirubinemic human plasma on the mPHEMA beads containing different amounts of immobilised HSA, (between 11–100 mg/g). The nonspecific bilirubin adsorption on the unmodified mPHEMA beads was 0.47 mg/g. Higher bilirubin adsorption capacities, up to 64.7 mg/g, were obtained with the HSA‐immobilised magnetic beads. Bilirubin adsorption increased with increasing temperature.

Effect of HSA loading on bilirubin adsorption.     

EXPRESSION OF A PARTIAL SYNTHETIC HUMAN TNF cDNA IN E. coli

A recombinant human tumour necrosis factor (rhTNF) cDNA was constructed. The TNF gene was isolated from a human genomic gene library. There are four exons in the TNF gene. The fourth exou codes for 140 amino acids of the TNF matured protein which is composed of 157 amino acids. A major portion of the fourth exon was isolated and then ligated to a synthesized DNA fragment coding for the remaining amino acids. The partial synthetic hTNF (rhTNF) cDNA thus generated was subcloned into a vector and successfully expressed in E. coli. 5-1 fer1entator was used to produce rhTNF. About 20g (wet weight) of bacterial pellet per liter medium and 106—10~7 units of cytotoxicity to L929 cells per milliliter medium were obtained. rhTNF was purified by HPLC and dried with a freeze dryer, rhTNF with a purity of about 95% in the form of white powder was obtained. The sequence of ten amino acids at the amino terminus of the rhTNF was determined. The result showed that it was identical with that of the natural human TNF.     

QCM Detection of Adhesion, Spreading and Proliferation of Human Breast Cancer Cells （MCF-7） on a Gold Surface

The quartz crystal microbalance (QCM) was used to monitor the one-day incubation of human breast cancer cells (MCF-7) on the gold electrode. In combination with an optical microscope simulation experiment, the cell-population pictures at various stages, the QCM responses to the cells' adhesion, spreading and proliferation on the electrode surface were discussed. The △f0 and △R1 responses were found mainly from mixed effects of viscodensity and surface stress, and in proportion to the cell coverage, rather than to the number of cells at the electrode. The significant fore-and-aft changes in cyclic voltammetry and electrochemical impedance spectroscopy of the ferri-ferrocyanide redox couple also proved that the cells were adhesion to the gold surface.