How high a resolution is needed for single-cell MSI?

Cell diameters are mostly 10–20 μm, and single-cell imaging usually requires resolution better than 10 μm; 2–3 μm allows resolving intracellular molecular gradients.

Which ion sources can achieve single-cell resolution?

SIMS can reach the nanometer scale and Neo-Source LDPI reaches 2–3 μm, both entering the single-cell/subcellular scale; DESI is mostly at the tissue scale.

What are the advantages of LDPI for single-cell imaging?

Matrix-free, ambient, 2–3 μm, low background above m/z≥70, balancing resolution and molecular coverage while avoiding MALDI matrix interference.

What is the relationship between single-cell imaging and spatial metabolomics?

Single-cell imaging is the high-resolution form of spatial metabolomics, used to map metabolite distribution at the single-cell/subcellular scale.

Product · Neo-Source

Single-Cell MSI Ion Source

Single-cell-level mass spectrometry imaging requires resolving molecular distribution at the micrometer or even sub-micrometer scale, placing extremely high demands on the spatial resolution of the ion source. SIMS can reach the nanometer scale, while Neo-Source LDPI enters the single-cell/subcellular scale at 2–3 μm, becoming a practical route that balances resolution with matrix-free low background.

Table of Contents
1. Resolution requirements 2. Mainstream technology routes 3. Applications and outlook

Single-Cell MSI Ion Source — schematic diagram

1. Resolution requirements

Cell diameters are mostly 10–20 μm, and subcellular organelles are smaller. To distinguish adjacent cells or intracellular regions, the pixel step needs to be comparable to or finer than the cell scale. Therefore, single-cell imaging usually requires a resolution better than 10 μm; entering 2–3 μm allows resolving molecular gradients within a single cell.

Improving resolution often involves a trade-off with ion yield and coverage: the smaller the step and the more pixels, the longer the dwell time per point and the total analysis time, placing higher demands on sample stability and system repeatability.

2. Mainstream technology routes

SIMS/TOF-SIMS achieves sub-micrometer to nanometer resolution through primary-ion bombardment, but belongs to hard ionization with many fragments, making it more suitable for elements and specific small molecules; Neo-Source LDPI achieves 2–3 μm, m/z≥70 low-background matrix-free imaging through laser/photoionization, balancing resolution and molecular coverage at the tissue single-cell scale.

In comparison, DESI is mostly tens to hundreds of micrometers, leaning toward the tissue scale; LDPI's 2–3 μm is closer to single-cell needs, and its matrix-free nature avoids MALDI matrix interference in the low-mass region, facilitating single-cell metabolite research.

3. Applications and outlook

Single-cell mass spectrometry imaging has been used in studies of tumor microenvironment heterogeneity, molecular atlases of hippocampal subregions, and metabolic gradients in embryonic development. With improving resolution of matrix-free ambient sources, single-cell spatial metabolomics is moving from methodology into routine research.

The 2–3 μm resolution of Neo-Source LDPI (among the leading in the industry) makes single-cell/subcellular imaging more feasible in conventional laboratories; combined with model-by-model instrument compatibility, related research can be carried out on existing mass spectrometers.

Neo-Source MSI LDPI Laser Desorption Photoionization Imaging Source

Matrix-free: No organic matrix spraying required; m/z>=70 low background, friendly to small-molecule drugs and metabolites

Ambient operation: Works in open ambient environment; simplified sample preparation; supports near in-situ / in-vivo analysis

Resolution: 2-3 um spatial resolution, among the leading in the industry, reaching single-cell / subcellular scale

Modular compatibility: External add-on design; model-by-model compatibility with Agilent / SCIEX / Thermo mainstream MS hosts

View LDPI specifications and compatible models →

Frequently Asked Questions (FAQ)

How high a resolution is needed for single-cell MSI?: Cell diameters are mostly 10–20 μm, and single-cell imaging usually requires resolution better than 10 μm; 2–3 μm allows resolving intracellular molecular gradients.
Which ion sources can achieve single-cell resolution?: SIMS can reach the nanometer scale and Neo-Source LDPI reaches 2–3 μm, both entering the single-cell/subcellular scale; DESI is mostly at the tissue scale.
What are the advantages of LDPI for single-cell imaging?: Matrix-free, ambient, 2–3 μm, low background above m/z≥70, balancing resolution and molecular coverage while avoiding MALDI matrix interference.
What is the relationship between single-cell imaging and spatial metabolomics?: Single-cell imaging is the high-resolution form of spatial metabolomics, used to map metabolite distribution at the single-cell/subcellular scale.

Get Specifications & Quotation

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).

Single-Cell Resolution 2μm Imaging Source Neo-Source MSI LDPI Laser Desorption Photoionization imaging ion source SIMS / TOF-SIMS Spatial Metabolomics Spatial Resolution Matrix-Free MSI Ion Source

← Back to MSI Ion Source Knowledge Hub