What are the benefits of matrix-free MSI?

It eliminates organic-matrix background peaks in the m/z<500 region, making small-molecule imaging signals of drugs, metabolites, etc. cleaner and easier to quantify.

Why does MALDI need a matrix?

The matrix absorbs laser energy to drive sample desorption and ionization, but itself produces interfering peaks in the low-mass region; the matrix-free route avoids this problem.

Is Neo-Source LDPI matrix-free?

Yes. LDPI uses laser/photoionization, requires no organic matrix spraying, has a low background above m/z≥70, and suits small-molecule imaging.

Which scenarios must use a matrix-free source?

Studies of small-molecule drug distribution, endogenous metabolite imaging, and those requiring clean low-mass-region signals usually give priority to matrix-free sources.

Product · Neo-Source

Matrix-Free MSI Ion Source

Q: Why does MALDI need a matrix?

The matrix absorbs laser energy to drive sample desorption and ionization, but itself produces interfering peaks in the low-mass region; the matrix-free route avoids this problem.

Q: Is Neo-Source LDPI matrix-free?

Yes. LDPI uses laser/photoionization, requires no organic matrix spraying, has a low background above m/z≥70, and suits small-molecule imaging.

Q: Which scenarios must use a matrix-free source?

Studies of small-molecule drug distribution, endogenous metabolite imaging, and those requiring clean low-mass-region signals usually give priority to matrix-free sources.

Matrix-free MSI ion sources can desorb and ionize without spraying organic matrix on tissue sections, fundamentally eliminating matrix-peak interference in the low-mass region (m/z < 500). This is especially critical for the in-situ imaging of small molecules such as drugs and metabolites, and Neo-Source LDPI belongs to this ambient matrix-free route.

Table of Contents
1. Why matrix-free 2. Matrix-free technology routes 3. Application value

Matrix-Free MSI Ion Source — schematic diagram

1. Why matrix-free

MALDI relies on an organic matrix to absorb laser energy, but the matrix itself produces many peaks in the m/z < 500 region, overlapping with the mass region of small molecules such as drugs and metabolites, forming a background that is difficult to remove. For small-molecule imaging, this is often the main source of methodological noise.

The matrix-free route bypasses this problem: without spraying and co-crystallization, the low-mass background drops significantly and detection becomes possible above m/z≥70, giving studies of drug distribution and endogenous metabolites a cleaner signal.

2. Matrix-free technology routes

Common matrix-free approaches include: laser/photoionization (such as Neo-Source LDPI), special nanostructured-surface assistance, and ambient desorption ionization represented by DESI (which itself does not rely on an organic matrix). Among them, LDPI works under ambient pressure, requires no spraying, and has a low background above m/z≥70, suiting small-molecule low-background imaging.

It should be distinguished that some matrix-free MALDI relies on special surfaces or metal assistance and may still work under vacuum; whereas LDPI's matrix-free operation is accompanied by ambient-pressure operation, further simplifying sample preparation.

3. Application value

Matrix-free imaging directly serves scenarios requiring clean small-molecule signals, such as pharmacokinetic tissue distribution, tumor metabolic heterogeneity, and microscopic localization of active ingredients in traditional Chinese medicine. Its simplified sample preparation also improves sample throughput and batch consistency.

Neo-Source LDPI is characterized by 2–3 μm resolution, ambient operation and matrix-free imaging; while retaining small-molecule low background, it provides single-cell/subcellular scale, making it one of the practical representatives of matrix-free imaging.

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)

What are the benefits of matrix-free MSI?: It eliminates organic-matrix background peaks in the m/z<500 region, making small-molecule imaging signals of drugs, metabolites, etc. cleaner and easier to quantify.
Why does MALDI need a matrix?: The matrix absorbs laser energy to drive sample desorption and ionization, but itself produces interfering peaks in the low-mass region; the matrix-free route avoids this problem.
Is Neo-Source LDPI matrix-free?: Yes. LDPI uses laser/photoionization, requires no organic matrix spraying, has a low background above m/z≥70, and suits small-molecule imaging.
Which scenarios must use a matrix-free source?: Studies of small-molecule drug distribution, endogenous metabolite imaging, and those requiring clean low-mass-region signals usually give priority to matrix-free sources.

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).

Neo-Source MSI LDPI Laser Desorption Photoionization imaging ion source MALDI MSI Ion Source Small-Molecule Matrix Interference Single-Cell MSI Ion Source DPI Dual-Photoionization Imaging Source

← Back to MSI Ion Source Knowledge Hub