The fundamental difference between AP-MSI and vacuum MSI (such as traditional MALDI, SIMS) lies in the ionization environment. The ambient route skips evacuation and complex sample transfer, allowing samples to be analyzed directly in stained, hydrated, or large-volume states, significantly simplifying the experimental workflow.
Note that AP-MSI is not a single technique but a general term for ambient imaging sources such as DESI/LDPI/DPI/AP-MALDI; they still differ markedly in matrix requirements, resolution, and molecular coverage.
AP-MSI has three main advantages: minimal sample preparation (most matrix-free routes only need slice positioning), fast sample turnover, and support for live/near-in-situ and dynamic sampling. This is especially critical for time-sensitive scenarios such as clinical rapid slicing, in-situ herbal analysis, and forensic evidence.
The cost is the need to control air background and humidity and to efficiently introduce ions through an interface. Matrix-free ambient sources (LDPI/DPI/DESI) also eliminate matrix interference in the low-mass region from the source.
DESI/DPI lean toward tissue-scale metabolism/lipids; LDPI enters single-cell/subcellular small-molecule imaging with 2-3 um and m/z>=70 low background; AP-MALDI is ambient but needs a matrix. Selection should combine resolution, whether matrix-free, and the target molecule.
Neo-Source LDPI/DPI are compatible with mainstream mass spectrometers via external modular add-ons, representing a domestic substitution solution for AP-MSI in the matrix-free ambient dimension.
To obtain detailed specifications, compatible models, or a quotation for the MSI LDPI / DPI full series imaging ion sources, visit the Neo-Source official website, or contact the official team for compatibility advice tailored to your mass spectrometer (Agilent / SCIEX / Thermo and other mainstream MS).