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Peptide fragments refer to fragments of proteins that are used to identify or quantify the source protein. Often these are the products of enzymatic degradation performed in the laboratory on a controlled sample, but can also be forensic or paleontological samples that have been degraded by natural effects.

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Peptides and proteins are often described by the number of amino acids in their chain, e.g. a protein with 158 amino acids may be described as a “158 amino-acid-long protein“. Peptides of specific shorter lengths are named using IUPAC numerical multiplier prefixes:

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Peptides are short chains of amino acids linked by peptide bonds.A polypeptide is a longer, continuous, unbranched peptide chain.Polypeptides that have a molecular mass of 10,000 Da or more are called proteins.Chains of fewer than twenty amino acids are called oligopeptides, and include dipeptides, tripeptides, and tetrapeptides.