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相关概念视频

Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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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...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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...
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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Updated: Jan 12, 2026

Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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一个新型的超高分辨率Y注射多反射飞行时间质谱仪,用于自下而上的蛋白质学.

Aleksey V Vorobyev1, Vasily V Makarov1, Stanislav P Kozlov1

  • 1Mass Spectrometry Consulting Ltd, MSC-CG, Bar 85000, Montenegro.

Analytical chemistry
|November 4, 2025
PubMed
概括
此摘要是机器生成的。

一种新型的超高分辨率质谱仪 (Y-MRT MS) 能够进行全面的全蛋白质组分析. 这项技术能够以高质量精度识别成千上万的蛋白质组,推动了自下而上的蛋白质组学研究.

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科学领域:

  • 蛋白质组学是指蛋白质组学.
  • 分析化学 分析化学
  • 生物技术是生物技术.

背景情况:

  • 下向蛋白质组学旨在识别和量化复杂的生物样本中的蛋白质.
  • 现有的质谱技术在分辨率,速度和动态范围方面面临限制,无法进行全面的蛋白质组分析.

研究的目的:

  • 介绍一个新的平面多通道飞行时间质谱仪与周期反射镜头 (Y-MRT MS) 的初始性能评估.
  • 评估Y-MRT MS仪器对超高分辨率,自下而上的全蛋白质组分析的能力.

主要方法:

  • 使用Y-MRTMS仪器对人类细胞系 (MCF-7和HeLa) 的全蛋白质组分析.
  • 采用DirectMS1方法进行MS/无MS蛋白质组分析和SWATH-DIA模式进行数据独立获取.
  • 进行一次性30分钟梯度高性能液态染色学 (HPLC) 分离.

主要成果:

  • 在m/z范围内的酸离子实现了600,000800,000的分辨率.
  • 在一次性分析 (DirectMS1) 中确定了4000多个蛋白质组,在联合运行中确定了多达4500个蛋白质组.
  • 已证明离子质量精度为70130ppb,动态范围超过104.
  • 在30分钟梯度内,在SWATH-DIA模式下获得了4350个蛋白质ID.

结论:

  • Y-MRT MS 仪器展示了高性能自下而上的蛋白质组学的巨大潜力.
  • 获得的分辨率和灵敏度有助于更深层次的蛋白质覆盖.
  • 未来使用HPLC和离子移动性分离的优化可能进一步提高蛋白质组覆盖率并缩短分析时间.