Can blood and urine samples be analyzed by mass spectrometry imaging?
Yes, but mostly in the form of 'film formation/spotting' rather than tissue sections. Blood can be smeared, made into dried blood spots, or spotted onto a substrate after component separation; urine is formed into a film after evaporation, freeze-drying or enrichment, and then mass spectrometry imaging is used to obtain metabolite/drug distribution fingerprints. The spatial information of body fluids is weaker than that of tissue, and the value often lies in the overall fingerprint and deposition localization.
Can blood and urine samples be analyzed by mass spectrometry imaging? — schematic diagram
1. Blood handling
Whole-blood smears, dried blood spots (DBS) or spotting after plasma/blood-cell separation are the most common MSI forms; the goal is to convert the liquid into a spatially resolvable thin layer.
Compared with tissue sections, blood is more homogeneous, and imaging mostly gives point fingerprints rather than strong spatial gradients, suitable for rapid screening.
2. Urine handling
Urine has high salinity and large volume, and is usually evaporated/freeze-dried or enriched on a substrate into a film before imaging, to reduce matrix effects and improve signals.
Urine MSI is often used for metabolite profiles, drug excretion and in-situ deposition studies, together with drug metabolism analysis.
3. Ion source adaptation
Matrix-free sources (LDPI, DESI, DPI) are more suitable for body-fluid small molecules because of their low background and freedom from matrix interference; MALDI can also be used in specific matrix-optimized scenarios.
If organ distribution is of interest, tissue sections remain primary; body fluids are more suitable as rapid, low-invasion screening samples.
4. Practical boundaries
The advantage of body-fluid MSI is minimally invasive, repeatable sampling; the limitation is limited spatial-dimension information, and interpretation needs to combine clinical and tissue data.
It is recommended to define the film-formation protocol and quality control in the methodology to ensure batch comparability.
Frequently Asked Questions (FAQ)
Can blood be analyzed by MSI?
Yes, imaged after smearing/dried blood spot/spotting into a film, mostly fingerprint-style.
How is urine handled?
Evaporated/freeze-dried or enriched into a film, then imaged after reducing salt effects.
Which source is used?
Matrix-free low-background LDPI/DESI/DPI are more suitable for body-fluid small molecules.
Limitations of body-fluid MSI?
Spatial information is weaker than tissue, suitable as screening, and needs to be combined with tissue data.
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).