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Related Concept Videos

Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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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Peptide structural analysis using continuous Ar cluster and C60 ion beams.

Satoka Aoyagi1, John S Fletcher, Sadia Sheraz Rabbani

  • 1Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu-cho, Matsue-shi, Shimane, 690-8504, Japan. aoyagi@life.shimane-u.ac.jp

Analytical and Bioanalytical Chemistry
|July 10, 2013
PubMed
Summary
This summary is machine-generated.

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) using argon (Ar) cluster beams effectively detects peptide molecular and fragment ions. This advanced technique enhances peptide structural analysis by revealing amino acid sequences previously difficult to discern.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Biochemistry

Background:

  • Peptide structural analysis requires detecting fragment ions from neighboring amino acid residues.
  • Conventional Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) using primary ion beams like Bismuth (Bi) clusters struggles to detect these larger fragment ions.
  • Newer cluster ion beams, such as C60 and Argon (Ar), are being explored for enhanced secondary ion generation in ToF-SIMS.

Purpose of the Study:

  • To investigate the novel application of ToF-SIMS with continuous Ar cluster beams for peptide analysis.
  • To evaluate the effectiveness of large cluster ion beams (Ar and C60) for detailed peptide structural elucidation.
  • To compare the performance of Ar cluster beams against conventional Bi3(+) primary ion beams in ToF-SIMS.

Main Methods:

  • Utilized Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) with continuous Argon (Ar) cluster beams.
  • Analyzed two sets of model peptides: (des-Tyr)-Leu-enkephalin and (des-Tyr)-Met-enkephalin (approx. 400 Da).
  • Also analyzed [Asn(1) Val(5)]-angiotensin II and [Val(5)]-angiotensin I (approx. 1,000 Da) to assess large cluster beam utility.

Main Results:

  • Argon (Ar) cluster beams clearly detected peptide molecular ions and large fragment ions.
  • These ions were not easily detected using conventional ToF-SIMS primary ion beams, such as Bi3(+).
  • Large fragment ions indicative of peptide amino acid sequences were successfully detected using Ar cluster beams.

Conclusions:

  • Argon (Ar) cluster beams significantly improve the detection of peptide molecular and fragment ions in ToF-SIMS.
  • The Ar cluster and C60 ion beams demonstrate considerable utility for comprehensive peptide structural analysis.
  • This technique offers a more effective approach for elucidating peptide sequences compared to conventional methods.