2025/05/07 by Susanne Dietrich, Anja Dollinger, Andreas Wieser +1
Biochemistry, Genetics and Molecular Biology · Chemistry · #Bacterial Identification and Susceptibility Testing #Mass Spectrometry Techniques and Applications #Metabolomics and Mass Spectrometry Studies
paper · pdf · doi:10.1002/rcm.10061
openalex publication_date 2025/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21
RATIONALE: The reproducibility of the analysis of oligonucleotides using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) remains a significant challenge. This is mainly attributed to factors such as the choice and application of the matrix, as well as the inhomogeneity of the sample spots. Although previous studies have explored various parameters, such as ionic and sugar-based matrices, and different spotting methods, none have comprehensively integrated these factors into a unified approach. METHODS: Various matrices for the analysis of oligonucleotides and the effects of diverse variables, including different matrices, solvent compositions, additives, and application techniques, on the analytical performance of these matrices were investigated. Mass spectrometry analysis was conducted by a MALDI-TOF MS in linear negative mode. RESULTS: Our research systematically evaluates the combined effects of diverse variables to enhance the analytical performance of MALDI-TOF MS in oligonucleotide analysis. We focused on the standard deviation of mass-to-charge ratios and the signal-to-noise (S/N) ratios. Out of 48 samples, only 19 met the S/N criteria, which is that the signals must be detectable over the whole mass range of interest (4-10 kDa). CONCLUSIONS: The ionic matrix 6-aza-2-thiothymine (ATT) with 1-methylimidazole resulted consistently in a reduced standard deviation and achieved high mass precisions. Additionally, we observed that the S/N ratios and mass precision of 3-hydroxypicolinic acid (3-HPA) varied significantly depending on the solvent composition and the presence of additives.