Biological Mass Spectrometry Overview

Principles

Definition

Biological mass spectrometry is an analytical field and methodological approach that applies mass spectrometry techniques to the study of biological molecules and systems. It involves the ionization and measurement of mass-to-charge ratios of biomolecular entities for their identification, quantification, structural elucidation, and analysis within complex biological matrices, providing critical insights into biological processes and states.

Ontological type

Biological Applications

Core Techniques

Biomolecular Targets

Key developments

Key Figures

Fragmentation-Based Structural Analysis era

Fred W. McLafferty[1] was a pioneer in fragmentation-based mass spectrometry during the Fragmentation-Based Structural Analysis era, with affiliations including Purdue University West Lafayette[2]. In 1959, Mass Spectrometric Analysis. Molecular Rearrangements[3] outlined diagnostic fragment pathways and molecular rearrangements that established a blueprint for interpreting mass spectra in terms of connectivity, anchoring the era's practice of structural deduction through fragmentation. That work on Mass Spectrometric Analysis. Molecular Rearrangements[3] highlighted the interpretive logic of rearrangements as diagnostic features, guiding subsequent methodological refinements and standardization efforts in spectral analysis. Its legacy extended to the broad adoption of diagnostic fragmentation reasoning and influence on the later coupling of spectral interpretation with chromatographic separations and reference spectra compilations that characterized fragmentation-based structural analysis.

Soft Ionization and Interfaces era

Michael Karas [1], associated with Albert Einstein College of Medicine [3] and the University of Freiburg [4], helped drive the Soft Ionization and Interfaces era of mass spectrometry. His key contributions include Laser desorption ionization of proteins with molecular masses exceeding 10,000 daltons [7] and Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry of Biopolymers [8], which enabled intact high-mass biomolecule analysis and broader analyte scope. Franz Hillenkamp [2], affiliated with Harvard University [5] and Goethe University Frankfurt [6], helped define the Soft Ionization and Interfaces era. His key contributions, demonstrated by Laser desorption ionization of proteins with molecular masses exceeding 10,000 daltons [7] and Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry of Biopolymers [8], advanced soft ionization methods that preserved molecular ions and broadened the analytical scope for high-mass and complex samples.

Omics-Scale Quantitative MS era

Gary Siuzdak [1], with affiliations at the Massachusetts Institute of Technology [3] and Baylor College of Medicine [4] during this era, helped drive omics-scale MS tooling and large-scale data workflows exemplified by XCMS [7]. XCMS [7] introduced nonlinear peak alignment, matching, and identification for metabolomics data, enabling automated peak detection and cross-sample comparability that underpinned high-throughput metabolomics in this era. Emma Schymanski [2], with ETH Zurich [5] and the University of Bayreuth [6] in this era, advanced frameworks for communicating confidence in small-molecule identifications via high-resolution mass spectrometry, as articulated in Identifying Small Molecules via High Resolution Mass Spectrometry: Communicating Confidence [8]. These standards and practices supported rigorous QA/QC, reproducibility across labs, and the spatially resolved, high-throughput ambitions of omics-scale MS by enabling clear confidence metrics for identifications.