Related Experiment Video
Updated: Jun 21, 2025
11:14
Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders
Published on: April 14, 2015
16.0K
Analysis of Polypeptides by Amino Acid Analysis
1Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark. php@bmb.sdu.dk.
Methods in Molecular Biology (Clifton, N.J.)
|July 12, 2024
Summary
Amino acid analysis provides accurate peptide composition and quantitation, crucial for quality control before conjugation. Careful hydrolysis and chromatography methods yield reliable results, even with limitations like tryptophan destruction.
Area of Science:
- Biochemistry
- Analytical Chemistry
Background:
- Peptide composition and quantity are critical parameters.
- Accurate analysis ensures reliable peptide conjugation and immunization outcomes.
Purpose of the Study:
- To detail a robust method for amino acid analysis of polypeptides and synthetic peptides.
- To establish reliable quality control for peptides used in bioconjugation and immunization.
Main Methods:
- Peptide hydrolysis using 6-M HCl in the gas phase at 110°C for 20-24 hours.
- Amino acid separation via ion-exchange chromatography with post-column ninhydrin derivatization.
- Consideration of hydrolysis limitations affecting tryptophan, cysteine, glutamine, and asparagine.
Main Results:
- Amino acid analysis combined with mass spectrometry offers reliable peptide quality and quantity control.
- Established methods allow for quantitation with an accuracy better than 5%, accounting for analytical limitations.
- Identified key amino acids affected by hydrolysis conditions, including tryptophan, cysteine, glutamine, and asparagine.
Conclusions:
- Amino acid analysis is an indispensable tool for peptide characterization.
- The described methodology, with appropriate adjustments, ensures high accuracy in peptide quantitation.
- Reliable peptide analysis is fundamental for successful downstream applications in research and development.
More Related Videos
Related Concept Videos
01:33Peptide 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
01:28What are Proteins?
14.5K
Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight. Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional...
14.5K
01:19Mass Spectrometry of Amines
4.2K
In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule: a molecule with an odd number of nitrogen atoms produces a parent ion with an odd molecular weight. The remaining fragments have an even mass.
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...
4.2K
01:24Protein Organization
6.4K
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....
The primary structure of a protein is its amino acid sequence....
6.4K
00:55Mass Spectrometry: Amine Fragmentation
1.6K
Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing...
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing...
1.6K