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Related Concept Videos

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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...
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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...
Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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...
High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

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 example, the mass of helium...

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Related Experiment Video

Updated: May 13, 2026

Improved Polymerase Chain Reaction-restriction Fragment Length Polymorphism Genotyping of Toxic Pufferfish by Liquid Chromatography/Mass Spectrometry
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Body fluid identification by mass spectrometry.

Heyi Yang1, Bo Zhou, Haiteng Deng

  • 1New York City Office of Chief Medical Examiner, 421 East 26th Street, New York, NY, 10016, USA.

International Journal of Legal Medicine
|March 26, 2013
PubMed
Summary

Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) offers a confirmatory method for identifying body fluids like blood, saliva, and semen. This advanced technique detects multiple protein markers simultaneously, even in minute sample volumes.

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Last Updated: May 13, 2026

Improved Polymerase Chain Reaction-restriction Fragment Length Polymorphism Genotyping of Toxic Pufferfish by Liquid Chromatography/Mass Spectrometry
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Published on: September 20, 2016

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Published on: February 18, 2022

Area of Science:

  • Forensic Science
  • Biochemistry
  • Analytical Chemistry

Background:

  • Traditional body fluid identification methods use specific functional proteins but often lack confirmatory power due to reliance on non-specific reactions.
  • Existing techniques can be hindered by the need for structural integrity of markers and can yield false positives from other substances.

Purpose of the Study:

  • To develop and validate a single, confirmatory test for simultaneous detection of multiple body fluid protein markers.
  • To leverage advances in proteomics and mass spectrometry for enhanced body fluid identification.

Main Methods:

  • Utilized matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) to identify multiple protein markers for blood, saliva, and semen.
  • Assessed the detection limits, ability to distinguish mixtures, and long-term stability of protein markers in mock samples.

Main Results:

  • Successfully detected blood, saliva, and semen at nanoliter to subnanoliter levels using MALDI-MS.
  • Demonstrated the ability of MALDI-MS to differentiate between mixtures of body fluids.
  • Confirmed protein marker stability over 16 months with no signal diminution.

Conclusions:

  • MALDI-MS provides a highly specific and confirmatory method for body fluid identification by detecting multiple peptides from multiple protein markers.
  • The assay requires no prior knowledge of the unknown stain, as mass spectrometry detects all present peptides.
  • This technique offers a robust and sensitive approach for forensic and clinical applications.