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Mass Spectrometry of Amines

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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 molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic aliphatic amines show...

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...

Mass Spectrometry: Amine Fragmentation

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...

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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.
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Purification and Analytics of a Monoclonal Antibody from Chinese Hamster Ovary Cells Using an Automated Microbioreactor System

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Amino acid analysis.

Shane M Rutherfurd¹, G Sarwar Gilani²

¹Riddet Institute, Massey University, Palmerston North, New Zealand.

Current Protocols in Protein Science

|November 26, 2009

Summary

This summary is machine-generated.

Amino acid analysis quantifies amino acid content in samples by hydrolyzing peptide bonds. This established method, developed in the 1950s, remains fundamental for protein and peptide research.

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Area of Science:

Biochemistry
Analytical Chemistry
Proteomics

Background:

Proteins are polymers of amino acids linked by peptide bonds.
Amino acid analysis is crucial for determining sample composition.
The fundamental methodology has remained consistent since the 1950s.

Purpose of the Study:

Provide an overview of amino acid analysis strategies.
Discuss various methodologies and associated challenges.
Detail common techniques for L-amino acid quantification.

Main Methods:

Hydrolysis of peptide bonds to liberate amino acids.
Separation, detection, and quantification of individual amino acids.
Specific methods include HCl hydrolysis, performic acid oxidation, and base hydrolysis.

Main Results:

Established protocols for amino acid analysis.
Detailed descriptions of techniques for methionine, cysteine, tryptophan, free amino acids, and reactive lysine.
Overview of strategic planning for effective amino acid analysis.

Conclusions:

Amino acid analysis is a vital technique in biochemistry.
The core methodology is robust and widely applicable.
Understanding various methods enhances analytical precision and scope.