使用毛细管电泳的蛋白质分析与通过振动尖端喷雾电离的质谱学相结合
Makenzie T Witzel1, Lindsay M Veltri1, Marius Kostelic2
1C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia, USA.
Electrophoresis
|April 5, 2024
概括
振动尖端喷雾电离 (VSSI) 为毛细电泳质谱法 (CE-MS) 蛋白质分析提供了无添加剂的接口. 这种方法可以对各种蛋白质进行敏感的检测和分离,克服专用涂层的吸附挑战.
科学领域:
- 分析化学 分析化学
- 生物化学 生物化学
- 分离科学 分离科学
背景情况:
- 毛细电泳 (CE) 与质谱学 (MS) 相结合,通常需要酸性添加剂或有机溶剂进行电离.
- 振动尖端喷雾电离 (VSSI) 是CE-MS接口的无电压替代方案,消除了对此类添加剂的需求.
- 这使得VSSI对敏感蛋白质分析特别有吸引力.
研究的目的:
- 评估CE-VSSI在没有传统的电离添加剂的情况下对蛋白质分离和检测的有效性.
- 探索克服毛细管电泳中非特异性蛋白质吸附的策略.
- 证明CE-VSSI对分析不同类型蛋白质的敏感性和适用性.
主要方法:
- 使用毛细管电泳与振动尖端喷雾电离 (CE-VSSI) 接口.
- 纳米流层分离利用低离子强度的水溶液与氨酸,以最大限度地减少抑制和添加.
- 用经过修改和未经修改的化二氧化毛细血管来评估蛋白质吸附效应.
主要成果:
- 在2.5-10μM范围内检测到蛋白质 (0.1-1.2 ng注入质量).
- 阴性蛋白质在未经修改的毛细血管上溶解,而阴性蛋白质需要酸性电解质或专门的涂层 (脂质,zwitterionic,阴性) 来进行有效的分离.
- 使用涂层毛细血管,在6-15分钟内实现了分离,通过调整MS入口温度,在19 ng时观察到蛋白质二次体.
结论:
- CE-VSSI为CE-MS蛋白质分析提供了一种可行的,无添加剂的方法.
- 毛细血管的表面修饰对于克服与cationic蛋白质的吸附问题至关重要.
- 在复杂的蛋白质混合分析中,VSSI接口表现出高灵敏度和适应性.
相关概念视频
Electrospray Ionization (ESI) Mass Spectrometry
809
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
809
Peptide Identification Using Tandem Mass Spectrometry
6.4K
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
6.4K
Mass Spectrometry: Complex Analysis
765
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
765
Capillary Electrophoresis: Instrumentation
230
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
230
Capillary Electrophoresis: Applications
395
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
395
Electrophoresis: Overview
2.0K
Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
There...
2.0K


