共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
通常采用二维聚丙烯酰胺凝胶电泳(2D-PAGE)分析组织或细胞的全蛋白质,但难与质谱(MS)直接联用.用高效液相色谱(HPLC)和毛细管电泳(CE)分离分析蛋白质和多肽的一维分离模式的分辨率和峰容量有限.多维柱联用技术比一维分离有更高的分辨率和峰容量,便于和MS直接联用, 相似文献
7.
8.
微等电聚焦分离等位基因表达蛋白的研究 总被引:1,自引:0,他引:1
借助于显微操作方法,用等电聚焦和改进的超敏感染色技术对西葫芦单个花粉粒中的可溶性蛋白进行了电泳分析,获得了清晰的电泳图谱。在靠近酸性端有两条相距极近而且分布比较特殊的蛋白带,在第1种植株中,这两条带稍微靠近酸性端;在第2种植株中,它们稍微远离酸性端;在第3种植株中,它们相同于第1种和第2种,而且在两种之间的分布比例为1∶1。就这两条带的分布情况在判断植株的相对纯合性或杂合性方面的应用以及单花粉蛋白等电聚焦技术配合显微操作方法在群体遗传学和发育生物学研究方面的应用作了讨论。 相似文献
9.
毛细管等电聚焦-毛细管区带电泳二维蛋白质分离平台的构建及其性能 总被引:1,自引:0,他引:1
通常采用二维聚丙烯酰胺凝胶电泳 ( 2 D- PAGE)分析组织或细胞的全蛋白质 [1] ,但难与质谱 ( MS)直接联用 .用高效液相色谱 ( HPLC)和毛细管电泳 ( CE)分离分析蛋白质和多肽的一维分离模式的分辨率和峰容量有限 .多维柱联用技术比一维分离有更高的分辨率和峰容量 [2 ] ,便于和 MS直接联用 [3,4 ] ,易于实现自动化 .目前 ,有关 2 D- CE的报道相对较少 [5~ 7] ,我们初步实现了将 2 D- PAGE由平板转移到毛细管中[6 ,7] ,但凝胶柱的制作烦琐 ,存在交叉污染 ,不能与 MS直接联用 .本文用微透析中空纤维膜为接口构建了毛细管等电聚焦 ( … 相似文献
10.
单克隆抗体药物在生物制药行业占有重要地位,是生物医药领域发展的主要方向。因此,单克隆抗体药物的质量控制已成为全球生物制药企业及法规机构关注的热点,对单克隆抗体药物精确表征的需求日益增加。毛细管电泳技术具有分离效率高、分析速度快、分离模式多、样品用量少等特点,已成为单克隆抗体药物分析和质量控制的重要手段。该文对毛细管凝胶电泳、毛细管等电聚焦、毛细管区带电泳等模式在单克隆抗体药物的纯度分析、等电点测定、电荷异质性分析和N-寡糖分析的应用进行综述,以期为国内单克隆抗体研究开发和生产的企事业单位提供技术参考。 相似文献
11.
12.
基于移动中和界面(MNB)概念,研制了一种基于电泳酸碱滴定(EABT)的新装置.其核心技术是在电泳管中建立MNB,通过对电泳管中的MNB在一定时间内迁移距离的测定,推测酸或碱的浓度.EABT实验表明:HCl浓度的对数值与MNB移动距离存在线性关系.此关系可用于检测未知酸的浓度;不同酸碱指示剂对EABT方法没有明显影响,这能有效避免在容量分析法中不同指示剂对判定终点断滴所造成的误差;EABT具有良好的精密性和稳定性,日内差和日间差的RSD值分别小于1.6%和3.8%. 相似文献
14.
15.
IntroductionThedeterminationofbindingconstantsplaysanimportantroleforthestudiesofbiomoleculerecognition.Comparedwithtraditionalmethodstheaffinitycapillaryelectrophoresis(ACE)hasadvantagesofsmallsampleconsumption,andobservingtheinteractioninfreesoluti... 相似文献
16.
Climaco J. Metral George M. Janini Gary M. Muschik Haleem J. Issaq 《Journal of separation science》1999,22(7):373-378
A computer model is presented for the prediction of the electrophoretic mobilities of peptides from physical constants derived from their amino acid sequences. The model assumes that the electrophoretic mobility can be represented by a product of four functions according to the relation: lcomp= l(L)w(W)q(Q)c(CC), where L (a length parameter) is represented by the number of amino acid residues of the peptide, W (a width parameter) is represented by the average residue mass, Q = the charge of the peptide, and CC = the position of the center of charge relative to the center of mass. The model was used to calculate the electrophoretic mobilities of peptides in a 50 mM phosphate buffer at pH 2.5. Sixty-four test peptides ranging in size from 2 to 39 amino acid residues were used for this study. The calculated mobilities show excellent correlation with experimental measurements with a correlation coefficient greater than 0.98. 相似文献
17.
研究了一种以过渡金属离子为添加剂,基于配位相互作用的毛细管电泳技术。选择7种芳香胺类化合物作为分析对象,考察了金属离子种类和浓度、运行介质酸度、电压对配位毛细管电泳的影响。通过对邻苯二胺变质样品的鉴别以及实际合成药磺胺类药物的分离,考察了这种毛细管电泳分离技术的分离能力,效果令人满意。应用于颠茄磺苄啶片中磺胺甲噁唑(SMZ)的定量测定时,SMZ的检出限为0.12 mmol/L;线性范围为0.25~10 mmol/L(r2=0.9917);平均加样回收率为97.8%,表明所建立的配位作用毛细管电泳(C ICE)方法,具有稳定、可靠的定性和定量分析能力。 相似文献
18.
Studies of particle electrophoresis have so far been limited to primarily theoretical or numerical analyses in straight microchannels. Very little work has been done on particle electrophoretic motions in real microchannels that may have one or multiple turns for reducing the devices size or achieving other functions. This article presents an experimental and numerical study of particle electrophoresis in curved microchannels. Polystyrene microparticles are found to migrate across streamlines and flow out of a spiral microchannel in a focused stream near the outer wall. This transverse focusing effect arises from the dielectrophoretic particle motion induced by the nonuniform electric field intrinsic to curved channels. The experimental observations agree quantitatively with the numerical predictions. 相似文献
19.
Heinz Engelhardt Wolfgang Beck Jrg Kohr Thomas Schmitt 《Angewandte Chemie (International ed. in English)》1993,32(5):629-649
Capillary electrophoresis is a new analytical technique that has seen a great upswing in recent years, because this adaptation of electrophoresis may be automated and simple, direct quantification is possible. As in conventional electrophoresis, samples with a large range of molecular weights, from inorganic ions to biopolymers such as DNA and proteins, can be separated. Uncharged molecules can also be separated when micelle-forming detergents are added to the buffer; the distribution mechanism that then comes into play increases the separation efficiency of this micellar electrokinetic chromatography. Chiral additives such as cyclodextrins make the separation of enantiomers possible. The rapid increase in the popularity of capillary electrophoresis is reflected in instrument sales and the growing number of scientific publications dealing with the method, and it seems that the future of this technique is assured. 相似文献
20.
F. M. Everaerts A. A. A. M. van de Goor Th. P. E. M. Verheggen J. L. Beckers 《Journal of separation science》1989,12(1):28-31
In separation techniques, such as Liquid Chromatography and Capillary Zone Electrophoresis, separation is performed on the basis of differences in velocity of the various separands, making use of differences in k′ and/or effective mobility. While in chromatography the flow of the eluent is elementary, in electrophoretic techniques the electroosmotic flow is generally suppressed in order to avoid disturbing of the sample zone boundaries, which migrate with a maximal velocity of 10?3 m s?1. This holds especially for isotachophoretic separations, where separands migrate in consecutive zones with minimal detectable lengths of about 0.1 mm. If electroosmotic flow is applied as a transport mechanism, using capillaries as small as about 50 μm, linear velocities of the liquid flow can reach about 2 × 10?3 m s?1. Especially for ionic species with a low effective mobility, this velocity can be a multiple of the electrophoretic migration velocity in the separation compartment. Therefore, anionic, non-ionic, and cationic separands can migrate in the same direction. Depending on whether repulsive or attractive forces are operative, the electrophoretic separation power can be counteracted or favored. The separation mechanisms making use of (quasi)stationary phases are studied. Plotting the chromatographic behavior versus the electrophoretic shows transition areas to exist between the “purely” electrophoretic techniques and the “purely” chromatographic techniques. It must be stated that most of the recent publications in CZE, especially those with very narrow bore capillaries, can be allocated to the transition areas, sometimes with a strong chromatographic retention component. 相似文献