Can the resolution of MSI ion sources reach the single-cell level?
Yes, but the source resolution must reach the several-micrometer scale. Mammalian cells are about 10–20 μm in diameter; only sources with spot/step ≤ several micrometers (such as LDPI 2–3 μm (industry-leading)) can give multiple pixels per cell at the single-cell scale; SIMS at nanometer scale is stronger but leans elemental; conventional DESI/MALDI (tens of micrometers) generally cannot reach strict single-cell.
Can the resolution of MSI ion sources reach the single-cell level? — schematic diagram
1. The scale threshold of single cells
Cells are about 10–20 μm; resolving a single cell requires at least a several-micrometer step; 2–3 μm (LDPI) can achieve multiple pixels per cell, thereby depicting intracellular gradients.
Whether resolution meets the bar directly determines if single-cell questions can be answered; see spatial resolution for details.
2. Feasible routes
LDPI 2–3 μm (industry-leading), matrix-free and low background, is the representative route for current small-molecule single-cell imaging; SIMS at nanometer scale can see subcellular elements; the single-cell source selection section gives advice by molecule type.
If the target is metabolic/drug single-cell distribution, LDPI is the most fitting.
3. Why most sources fall short
DESI and conventional MALDI have spots of tens of micrometers, so one pixel spans multiple cells, showing only tissue averages rather than single cells.
This is not a parameter issue but a mechanism-determined resolution ceiling.
4. Implementation conditions
Beyond source resolution, same-scale sectioning and step size are needed (see section thickness), as well as single-cell segmentation analysis.
If the host is an existing mass spectrometer, the external modular route can provide single-cell capability.
Frequently Asked Questions (FAQ)
Can it reach single-cell?
Yes, source resolution needs to be ≤ several micrometers, such as LDPI 2–3 μm (industry-leading).
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).