Practical guidance for EV enrichment and downstream protein biomarker and LC-MS/MS workflows.
About the workflow
What downstream applications is the kit designed to support?
The kit is designed for EV-associated protein workflows, including discovery LC-MS/MS, targeted mass spectrometry, Western blotting, ELISA, Olink®, NuLISA™, multiplex immunoassays, and protein biomarker validation. Confirm that the selected lysis buffer and cleanup method are compatible with the downstream platform.
What makes the workflow different from ultracentrifugation?
The kit uses lipid nanoprobe based magnetic beads and a 15-minute capture step, eliminating the need for an ultracentrifuge. Magnetic processing supports standardized handling, parallel sample preparation, and straightforward transfer to automation after workflow validation.
Which EV populations are captured?
The workflow provides broad, pan-EV enrichment rather than selecting a single EV subtype. The recovered material may include small EVs commonly described as exosomes, microvesicles, and other membrane-bound EVs. EV composition depends on sample type and pre-analytical handling.
What sample volume should I use?
The validated starting inputs are:
- Plasma or serum: 250 μL per reaction.
- Cell culture media: 2.5 mL per reaction.
The protocol may be scaled, but larger sample volumes are not a direct substitution. Bead amount, tube capacity, Solution A, wash volume, mixing, and magnetic separation must be optimized together. A larger input may increase total protein recovery, but proteome depth depends on EV abundance, background carryover, cleanup, digestion, instrument method, and data analysis.
Can frozen samples be used?
Yes. Frozen plasma, serum, and conditioned media can be used. Thaw completely, mix gently until homogeneous, avoid repeated freeze-thaw cycles, and use the pre-clear option in the Operator Manual if debris or aggregates are present.
What is the validated reaction setup for this kit?
Use 0.5 mL Beads L2 (2.5 mg) per reaction. Add 0.5 mL Solution A for plasma/serum; skip Solution A for cell culture media.
Does the kit require specialized equipment?
No ultracentrifuge is required. The workflow uses a magnetic stand, tube rotator or mixer, vortex mixer, calibrated pipettes, and a standard microcentrifuge. Use Protein LoBind tubes from capture through lysis to help minimize nonspecific protein loss.
Proteomics performance and study use
What makes this kit suitable for blood proteomics?
Plasma and serum contain high-abundance proteins — including albumin, immunoglobulins, and lipoprotein-associated proteins — that can dominate proteomic measurements. The kit enriches an EV-associated fraction, and the three-wash workflow is designed to reduce soluble-protein and buffer carryover. This can support:
- Improved access to lower-abundance EV-associated biomarkers
- Greater proteome depth than direct analysis of unfractionated plasma or serum, depending on workflow and instrument performance
- More consistent sample preparation across research cohorts
Is this an albumin- or IgG-depletion product?
No. The kit is not an albumin- or IgG-depletion product. Residual plasma proteins may remain, and results depend strongly on sample quality, wash consistency, lysis, cleanup, digestion, chromatography, mass spectrometry, and data analysis.
Which lysis buffers are recommended for LC-MS/MS?
Two starting options are described in the Operator Manual: 5% SDS with 10 mM TEAB or 8M Urea lysis buffer. Detergent-containing lysates require an MS-compatible cleanup and digestion workflow. After lysis, keep magnetic beads and residual Wash Buffer out of the transferred protein lysate.
Can this kit be used for biomarker discovery studies?
Yes. The workflow is designed to support discovery proteomics, translational biomarker studies, longitudinal research cohorts, and multi-center studies. For reproducible results, finalize the pre-analytical, capture, wash, lysis, cleanup, digestion, LC-MS/MS, and data-processing procedures before processing the full cohort.
Is the kit compatible with post-translational modification (PTM) proteomics?
Yes. EV protein lysates may be used in downstream PTM-enrichment workflows, including:
- Phosphoproteomics
- Glycoproteomics and glycopeptide analysis
- Other PTM workflows after application-specific validation
PTM recovery depends on input, lysis chemistry, inhibitors, cleanup, digestion, enrichment, and MS sensitivity. Add appropriate phosphatase, protease, or other inhibitors for the selected workflow.
Operations and troubleshooting
Is the workflow compatible with automation?
Yes. Magnetic separation, transfer, mixing, and washing are compatible with many liquid handlers. Validate bead resuspension, magnet time, aspiration height, format, mixing, carryover, and recovery.
What should I check if protein yield or proteome depth is lower than expected?
Review the following before changing the protocol:
- Confirm sample input, thawing, mixing, and pre-clear conditions; vortex Beads L2 thoroughly.
- Maintain continuous mixing during the 15-minute capture; use Solution A only for plasma/serum.
- Complete all three 400 μL washes and remove the final wash completely.
- Review lysis, inhibitors, cleanup recovery, digestion, LC-MS/MS performance, expected EV abundance, and biological variability.
Can captured material or protein lysate be stored?
For best consistency, proceed directly. If storage is required, transfer cleared lysate away from the beads and freeze at −80°C. Avoid repeated freeze-thaw cycles, document duration, and validate the pause point for the intended assay.
Is the kit suitable for clinical research studies?
The workflow can support translational, longitudinal, biobank, and multi-site research when the complete procedure is validated and standardized. The EVs360™ Proteome-MS Kit is For Research Use Only and is not intended for diagnostic procedures.
