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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

1.3K
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

2.3K
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...
2.3K
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

6.4K
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...
6.4K
Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

8.1K
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...
8.1K
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

1.6K
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
1.6K
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

2.6K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
2.6K

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相关实验视频

Updated: Jan 10, 2026

Simultaneous Affinity Enrichment of Two Post-Translational Modifications for Quantification and Site Localization
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四极质谱仪的自动调方法基于改进的微分演化算法.

Yuanqing Zhang1,2, Baolin Xiong1,2, Le Feng3

  • 1School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.

Bioengineering (Basel, Switzerland)
|November 27, 2025
PubMed
概括
此摘要是机器生成的。

一个改进的微分进化算法增强了四极质谱仪调. 与传统技术相比,这种自动化方法显著提高了性能,提高了分析仪器的效率.

关键词:
自动调方法自动调方法改进了差异进化算法,改善了差异进化算法.突变战略的突变策略四极质谱仪是四极质谱仪.一个子群的子群.

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T-wave Ion Mobility-mass Spectrometry: Basic Experimental Procedures for Protein Complex Analysis
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科学领域:

  • 分析化学 分析化学
  • 工具分析 工具分析
  • 计算科学 计算科学

背景情况:

  • 四极质谱仪 (QMS) 是药品和诊断中的重要分析仪器.
  • 优化QMS性能依赖于调整关键参数,通常需要专家知识或基本搜索方法.
  • 现有的调方法是不理想的,限制了仪器的潜力.

研究的目的:

  • 开发用于四极质谱仪的自动调方法.
  • 通过先进的计算算法来提高QMS性能.
  • 为了克服传统的手动和单变调方法的局限性.

主要方法:

  • 为自动化QMS调整开发了一种改进的差异演变 (IDE) 算法.
  • IDE算法包括针对定制突变策略的排名和亚种群分类.
  • 使用CEC-2017基准函数和实践QMS调试实验验证算法性能.

主要成果:

  • 改进的差异演变算法在基准函数上表现出卓越的性能.
  • 使用IDE算法的自动调整,比单变量搜索提高了25.3%的性能.
  • 在QMS调整中,IDE方法的性能优于经典的微分演化和粒子群优化算法.

结论:

  • 提议的改进的差异演化算法为自动化QMS调整提供了有效的解决方案.
  • 这种方法显著提高了四极质谱仪的性能和效率.
  • 这些发现支持采用先进的进化算法来优化分析仪器.