During infection, the body’s metabolism shifts as inflammation and immune responses intensify. These changes can be detected by measuring blood metabolites. However, many metabolites involved in infection are difficult to analyze because they ionize poorly in mass spectrometry and vary greatly in concentration.
This study introduced a new method that tags carboxyl- and carbonyl-containing metabolites using a bromine-based derivatization reagent. Bromine is especially useful because it produces a unique isotope pattern in mass spectrometry. This pattern acts like a barcode, enabling researchers to identify tagged metabolites quickly.
Using this strategy, the researchers detected 1069 metabolites in serum samples and identified 198 of them in untargeted analysis. They also found abnormal levels of several inflammation-related metabolites, reported for the first time in Mycoplasma pneumoniae infection. Key metabolites, including glutamic acid, oxoglutaric acid, succinic acid, pyruvic acid, glyceric acid, and glycine, were proposed as potential biomarkers.
In simple terms, this method works like attaching a tracking label to invisible molecules, allowing scientists to monitor how infection changes metabolism. This approach can support future biomarker discovery and improve understanding of infectious disease mechanisms.
Reference
J. Han, Q. Yang, Z. Zhi, N. Li, and J.-L. Wu, “Bromine signature coded derivatization LC-MS for specific profiling of carboxyl or carbonyl-containing metabolites in Mycoplasma pneumoniae infection,” Talanta, vol. 285, p. 127345, 2025, doi: 10.1016/j.talanta.2024.127345.
