Proteomics - Glossary - peptidetesting.cc

Proteomics is the large-scale analysis of the proteome, which encompasses the entire set of proteins found within a specific sample. Typically performed using mass spectrometry (MS), this mass-based method identifies proteins, measures their quantity, and detects modifications to provide a comprehensive biological overview.

Standard workflow for mass spectrometry-based proteomics

Proteins are broken down into smaller fragments called peptides.
The peptides are separated to reduce sample complexity.
The peptides are ionized to carry an electric charge.
The peptides are fragmented into smaller ions.
The resulting data is interpreted to deduce amino acid sequence information.

Interpreting proteomics results on a laboratory report

Seeing proteomics or MS-based analysis on a lab report indicates that a systematic, mass-based measurement was conducted. This label alone does not guarantee absolute purity or safety. Although mass spectrometers are highly sensitive, they can produce false positives or negatives. Biological samples also face a dynamic range problem, where high protein concentrations can obscure low-level impurities.

Reliable results depend on rigorous quality control, such as method validation and instrument calibration. It is important to distinguish proteomics from peptidomics, which specifically studies naturally occurring native peptides. Proteomics also differs from a simple mass measurement, like a single LC-MS test for one isolated peptide, because it involves a large-scale analysis across many different analytes.

Standard workflow for mass spectrometry-based proteomics

Interpreting proteomics results on a laboratory report

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