In room-temperature operation, thawing lets molecules redistribute within the tissue along the aqueous phase, and sublimation loses volatile small molecules; both blur the true spatial signal. A cryogenic source keeps the sample at low temperature throughout, locking molecules in place and thus preserving distribution fidelity.
This works together with frozen-sectioning: sections are cut at low temperature, then directly transferred to the ion source for sampling under low or controlled temperature, avoiding an intermediate warming step.
The cryogenic approach can serve multiple sources: MALDI can spray matrix on a cryo-target then image; ambient sources such as DESI, LDPI, and DPI can sample directly on a low-temperature stage; TOF-SIMS can also bombard at low temperature to preserve small molecules. The core is consistent low-temperature fidelity.
For small-molecule and metabolite imaging, a cryogenic chain is almost mandatory; for larger molecules such as proteins/peptides, room-temperature MALDI is also acceptable, but cryo still improves reproducibility.
Advantages are high spatial fidelity and good small-molecule retention, supporting subcellular and metabolomics-level imaging; the cost is that equipment needs low-temperature components (cold stage, low-temperature transfer chamber), operations are more demanding, and frost and contamination must be prevented.
Its value lies in accuracy rather than speed: for studies needing true molecular localization (such as drug penetration, metabolic gradients), the credibility gain from low-temperature fidelity is significant.
A cryogenic source should be included in standard SOPs: unify freezing, sectioning, transfer, and sampling temperatures, and keep compatibility with H&E/IHC annotation. For matrix-free ambient sources (LDPI/DPI), cryo plus direct sampling forms a short-chain, high-fidelity solution.
Selection advice: prioritize imaging sources with cryo capability if small molecules, metabolites, and subcellular fidelity are the priority; for large molecules and throughput, conventional MALDI can also suffice.
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).