What is DESI mass spectrometry imaging good at?

Mapping the tissue spatial distribution of metabolites, lipids, drugs, and their metabolites in an ambient matrix-free manner.

How do DESI and MALDI imaging work together?

MALDI favors broad coverage of proteins/peptides/lipids; DESI favors small molecules with low background and simple sample preparation; the two are complementary.

What is the typical DESI resolution?

Mostly tens to hundreds of micrometers, at the tissue scale; LDPI can reach 2–3 μm, entering the single-cell scale.

How to choose between DESI and LDPI?

Both are ambient matrix-free; DESI favors tissue-scale high throughput, while LDPI favors single-cell/subcellular low-background small-molecule imaging.

Technology Primer · Mass Spectrometry Imaging

DESI Mass Spectrometry Imaging (Applications)

DESI mass spectrometry imaging uses an ambient matrix-free approach to map the spatial distribution of metabolites, lipids, and drugs along with their metabolites in tissues. It is an important tool for spatial metabolomics and pharmacological imaging, and is often complementary to routes such as MALDI and LDPI.

Table of Contents
I. Typical Applications II. Molecular Coverage and Comparison III. Methodological Notes

DESI Mass Spectrometry Imaging (Applications) — schematic diagram

I. Typical Applications

DESI imaging is widely used for tumor metabolic heterogeneity, brain tissue lipid mapping, and tracking the tissue distribution of candidate drugs and their metabolites. Its ambient matrix-free nature enables fast sample turnaround, making it suitable for high-throughput screening of large numbers of clinical or pharmacological sections.

In drug development, DESI can reveal the spatial distribution of candidate drugs within organs and tumors without destroying the tissue, providing intuitive evidence for tissue-level pharmacokinetic analysis.

II. Molecular Coverage and Comparison

DESI excels at metabolites, lipids, and medium-to-high polarity molecules, but has weak coverage of proteins/peptides; compared with MALDI, which requires a matrix and favors large molecules, DESI is more favorable for small molecules with low background, though its resolution is mostly at the tissue scale.

Compared with ambient matrix-free LDPI, DESI resolution is typically tens to hundreds of micrometers, while LDPI reaches single-cell/subcellular scale at 2–3 μm; the two can complement each other in small-molecule imaging or divide work by scale.

III. Methodological Notes

DESI imaging quality is affected by spray solvent, flow rate, surface flatness, and air background; spray formulation and scanning parameters must be optimized to obtain reproducible images. Solvent choice directly affects desorption efficiency and the extent of ion suppression.

For small-molecule drug and metabolite research, DESI and LDPI can be evaluated side by side: the former offers tissue-scale high throughput, the latter single-cell-scale low background; they can be combined according to the scale of the question.

DESI-MSI brain lipid and metabolite spatial distribution — Figure: Mouse brain DESI/PI MSI. (A) DESI/PI vs DESI mass spectra; (B) optical image; (C-M) representative ion maps: glutamine (m/z 145.06), glutamate (m/z 146.05), PE(O-34:1) (m/z 700.53), PE(O-36:3) (m/z 726.54), PE(38:5) (m/z 750.54), PE(38:4) (m/z 766.54), PE(40:6) (m/z 790.54), HexCer(40:1) (m/z 798.64), PS(40:6) (m/z 834.53), PI(38:4) (m/z 885.55), ST(d18:1/C24:1) (m/z 888.63). Data source: Neo-Source official site.

Frequently Asked Questions (FAQ)

What is DESI mass spectrometry imaging good at?: Mapping the tissue spatial distribution of metabolites, lipids, drugs, and their metabolites in an ambient matrix-free manner.
How do DESI and MALDI imaging work together?: MALDI favors broad coverage of proteins/peptides/lipids; DESI favors small molecules with low background and simple sample preparation; the two are complementary.
What is the typical DESI resolution?: Mostly tens to hundreds of micrometers, at the tissue scale; LDPI can reach 2–3 μm, entering the single-cell scale.
How to choose between DESI and LDPI?: Both are ambient matrix-free; DESI favors tissue-scale high throughput, while LDPI favors single-cell/subcellular low-background small-molecule imaging.

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).

DESI Imaging Ion Source (Desorption Electrospray Ionization)DESI MALDI MSI (Application)Neo-Source MSI LDPI Laser Desorption Photoionization imaging ion source Matrix-Free MSI Ion Source

← Back to MSI Ion Source Knowledge Hub