安捷伦7890毛细管色谱柱使用技巧

系统总结了安捷伦7890毛细管色谱柱种类,分析了色谱柱的选择标准,介绍了安装、使用、老化等色谱柱注意事项,目的是提高色谱柱的使用效率,延长色谱柱的使用寿命。     

直接进样法测定植物油中的脂肪酸

对植物油不经衍生化直接进样对脂肪酸进行测定 ,采用毛细管气相色谱法分析植物油中的脂肪酸成分和含量 ,其灵敏度比 GC(普通填充柱气相色谱法 )提高了 1 0 2～ 1 0 3倍     

Numerical Modeling of the Performance of R22 and R290 in Adiabatic Capillary Tubes Considering Metastable Two-Phase Region——Flow Characteristics and Parametric Analysis of R22 and R290

Characteristics of R22 and its new alternative refrigerant R200 flowing through adiabatic capillary tubes are investigated based on the homogeneous model. Extensive flow variables along tube length such as pressure, temperature, viscosity, velocity. Reynolds number, friction factor and vapor quality etc are compared between the two fluids under the same operating condition. Two cases are considered, namely, either the same tube length or the same mass flow rate as inlet condition. The results show that the mass flow rate in the capillary tube of R290 is 40% lower than that of R22 due to the differences of physical properties between the two fluids. Further. a parametric analysis is performed and it appears that effects of geometric and thermodynamic parameters on mass flow rate of R290 are weaker than that of R22. When the condensing temperature is increased from 40℃ to 50℃ C. the mass flow rate for R22 is increased by 16%. while the increasing rate for R290 is 13%.     

毛细管电泳及其在中药分析中的应用

毛细管电泳具有简单、快速、样品用量少和分离效率高等特点，日益引起分离科学界的极大关注，章简要介绍该方法的分离模式、进样技术和检测技术以及在中药分析中的应用，并展望其在中药材和中成药质量分析的应用前景。     

三甲基硅基键合相微乳液毛细管电动色谱

在总结毛细管电动色谱的基础上,提出了新型的三甲基硅基键合相微乳液毛细管电动色谱模式,并指出了该模式对于高效毛细管电泳走进常规工业分析领域的意义.     

毛细管绝热节流过程焓变化特性的理论分析与实验验证

计算分析了焓相等和滞止焓相等情况下毛细管中R22节流特性参数及其变化规律．并将两种情况下所选取的毛细管与真实制冷系统毛细管比较。理论计算和实验结果都表明滞止焓相等才是毛细管绝热节流的基本特性,而绝热节流焓相等的理论不够准确。     

离子液体在毛细管电泳中的应用

综述了离子液体在自由溶液毛细管电泳、胶束毛细管电泳、微乳毛细管电动色谱、非水毛细管电泳中的应用研究进展。     

X-linked adreno leukodistrophy: Profiles of very long chain fatty acids in plasma and fibroblasts in eigth Serbian patients

X-linked adrenoleukodistrophy is a severe neurodegenerative disorder with impaired very long chain fatty acid metabolism. The disease associated ABCD1 gene encodes a peroxisomal membrane protein which belongs to the superfamily of ATP-binding cassette transporters. We investigated eight male X-ALD patients diagnosed among 142 suspected patients referred for investigation. Plasma levels of very long chain fatty acids were measured at our laboratory using capillary gas chromatography. Eight cases of childhood X-ALD were diagnosed. This is the first published series of Serbian patients with X-ALD. In addition, diagnosis identifies carriers, which could be benefit for genetic counselling and prenatal diagnosis.     

毛细管电泳电化学检测法测定连翘中的芦丁

采用毛细管电泳电化学检测法测定了连翘中的芦丁.考察了工作电极的氧化电位、分离电压和进样时间对分离和检测的影响.在优化条件下,以300μm直径的碳圆盘电极为检测电极,检测电位为+0.9 V(vs.SCE),在50 mmol/L硼酸盐(pH8.4)的运行缓冲液中,被测物浓度与峰电流在三个数量级范围内呈良好线性,检测限为2×10-7g/mL.方法有着良好的重现性,被测组分的迁移时间和峰高的相对标准偏差(RSDs)小于4%(n=7).该法简单、可靠、快速,单次测定可在16 min完成,已经成功的应用于实际样品中芦丁的测定,样品处理简单,无须预富集,检测结果令人满意.①     

毛细管电泳中固定套管式电极定位装置的改进

研究采用固定套管式电极调节定位方式,实现了工作电极与毛细管检测端口的完美对接。将两石英玻璃套管(内径400μm)经精确准直后固定在检测池中,工作电极由细微的石英玻璃毛细管(外径375μm,内径200μm)制作而成,工作时只需将制作的工作电极和电泳毛细管(石英玻璃质,外径375μm)分别插入套管,在两套管(间距约3 mm)中部轻微接触对接即可。该方法定位精确,操作简单方便,工作效率高,检测重现性好,较目前市面上部分使用的三维自由调节方式和螺杆调节方式的检测池有明显的优势和实用意义。