Compensation of Topography Variability in MALDI-TOF MS

This technical report discusses the compensation of sample topography variability in Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) using lock mass correction. It outlines how variations in sample and matrix properties can lead to differences in ion generation heights, affecting mass resolution and accuracy. The report details the lock mass correction method, which utilizes a known mass to realign the detected mass of the sample species. Several applications are presented, including oligonucleotides, protein profiling, and imaging, demonstrating the effectiveness of lock mass correction in improving mass accuracy and resolution. The report provides experimental conditions and results from various case studies, illustrating the impact of topography on mass spectrometry outcomes and how lock mass correction can mitigate these issues. The findings indicate that this correction method enhances the reliability of mass spectrometry analyses, particularly in complex biological samples.