Using effective Lab Cell Strainers is essential when working with fragile and heterogeneous biological samples such as bone marrow. These tools help improve the accuracy of sample preparation, remove unwanted debris, and preserve the structural integrity of the target cells—especially when isolating peripheral blood mononuclear cells (PBMCs). High-quality PBMCs are critical for downstream applications such as immunology research, disease modeling, and therapeutic development. A poor straining step can lead to low cell viability, contamination, or sample loss, all of which compromise research outcomes.
The UberStrainer is a specialized sample preparation device designed to streamline this crucial stage. Unlike conventional filtration tools, UberStrainer offers a modular setup that supports multiple tube formats, controlled filtration using pressure, and backflushing options for maximum cell recovery. Its wide mesh size range—from 1 µm to 500 µm—makes it highly adaptable to different protocols and tissue densities.
What makes UberStrainer stand out in PBMC isolation from bone marrow is its ability to balance gentle handling with high-throughput capability. The device maintains cell integrity while efficiently processing both small and large sample volumes, making it an ideal solution for labs of all sizes. For researchers seeking reliability and scalability in PBMC isolation, UberStrainer offers both performance and confidence.
1. Challenges in PBMC Isolation from Bone Marrow
PBMC isolation from bone marrow involves several critical challenges:
Delicate Cells: PBMCs (lymphocytes and monocytes) are sensitive. Harsh handling can lead to low viability.


Complex Matrix: Bone marrow is dense with cells, fat, and stromal fragments. Separating PBMCs requires both selectivity and care.


Clogging Problems: Dense samples often clog standard filters, disrupting workflow.


Sample Loss: Inefficient filtration leads to lower yield, impacting downstream analysis or therapeutic applications.
UberStrainer directly addresses these issues, combining gentle handling, adaptable filtration, and seamless sample recovery.
2. Why UberStrainer Works Well with Bone Marrow
UberStrainer is a modular system designed to work with 1.5 ml, 2 ml, 15 ml, and 50 ml tubes. Key advantages include:
Mesh Size Variety
Choose from 15 mesh options to match your sample’s density. For bone marrow, 70 µm and 100 µm often offer the best balance—reducing clogging while preserving PBMCs.


Gentle Filtration
Connect a Luer-Lock syringe to apply low pressure. Unlike gravity-only strainers, this allows controlled flow rates. Cells pass through filter material with less stress.


Unlimited Volume Support
The airtight screw cap and Luer-Lock port allow continuous flow. Add freshly diluted bone marrow on top without stopping during filtration.


Easy Sample Recovery
The removable strainer enables precise backflush to recover retained PBMCs. This limits waste and improves yield.
These benefits contribute to high-quality PBMC isolations from bone marrow extracts.
3. Step-by-Step Isolation Using UberStrainer
Follow this workflow to isolate PBMCs from diluted bone marrow:
Dilute Bone Marrow
Add bone marrow into PBS or buffer to reduce viscosity. Use 70 µm or 100 µm mesh.


Load the Sample
Place the mesh into a 50 ml tube and pour the diluted bone marrow on top. Tighten the cap.


Filter Using Pressure
Attach a syringe or low-pressure pump with the Luer-Lock. Apply a consistent, gentle force to push liquid through the mesh.


Backflush to Recover PBMCs
Disconnect the pump, reverse pressure using clean buffer to flush trapped PBMCs through the mesh. Collect the filtrate.


Proceed to Downstream Processing
Use collected PBMCs in density gradient centrifugation or pluriBead/negative enrichment relevant to your research goals.


This step-by-step approach improves workflow efficiency while preserving PBMC viability and purity.
4. Integration with Particle Separation Techniques
UberStrainer works well with established particle separation techniques:
Density Gradient Centrifugation: After initial mesh filtration, run through a density gradient media to remove erythrocytes and granulocytes. Fundamentals remain the same, but starting with cleaner material enhances separation clarity and final yield.


Magnetic Enrichment or Negative Selection: Following mesh filtration, cells are in good shape for techniques like MACS, pluriBead, or pluriSpin. Clean material improves magnet uptake and reduces nonspecific binding.


Cascade Straining Setup: Use multiple UberStrainers in series for progressive filtration. Start with 100 µm and finish with 40 µm to achieve finer single-cell suspensions ready for precise flow cytometry or single-cell assays.
5. Maintaining Viability and Purity
UberStrainer helps preserve PBMC viability through:
Controlled Flow: Low-pressure filtration guards against damaging shear forces.


Minimal Transfers: Fewer handling steps reduce contamination and cell loss.


Fine-Tuned Mesh: Retains undesirable aggregates while allowing target cells through.
A clean mesh environment also reduces debris, leading to clearer samples for downstream culturing, immunostaining, or RNA sequencing.
6. Comparing to Standard Lab Strainers
Using UberStrainer instead of traditional lab cell strainers brings several advantages:
Greater Control: Active flow control versus passive flow ensures consistency.


Flexible Compatibility: Works across multiple tube formats and pressure systems.


Improved Sample Recovery: Backflush eliminates manual scraping and losses.


Modular Use: Mix and match strainers in cascade setups for multi-stage separation.


Overall, it outperforms traditional cell strainer systems in yield, purity, and ease of use.
7. Cost Efficiency and Workflow Speed
UberStrainer not only improves data quality but also boosts resource efficiency:
Reusable Components: Clean, sterilize, and reuse strainers quickly.


Faster Prep Time: Controlled flow and fewer steps means faster prep.


Reduced Sample Loss: Higher yield lowers costs per sample and ensures consistent experimental results.


These advantages make UberStrainer a cost-effective choice, especially for labs processing bone marrow regularly.
8. Real-world Use Cases in Bone Marrow Studies
Researchers handling bone marrow routinely report:
Higher PBMC Yield: Effective mesh selection and backflush maintain cell quantity.


Better Downstream Results: Cleaner samples improve flow cytometry clarity and assay reproducibility.


Adaptability: Works for small and large volumes—suitable for trials, clinical pipelines, and animal models.
9. Tips for Best Results
To optimize using UberStrainer for bone marrow:
Mesh Choice: Start with 100 µm, move to 70 µm for finer separation.


Dilution Strategy: Aim for 1:1 dilution with buffer to ease flow.


Pressure Control: Use syringe or gravity to avoid cell disruption.


Maintain Sterility: Single-use or autoclave between runs.


Combine Techniques: Use UberStrainer before density gradient or magnetic separation for higher precision.
10. Ensuring Lab Success with UberStrainer
Train the Team: Minimal training ensures consistent, reliable execution.


Standardize Protocols: Lock in mesh size, pressure range, and dilution for better reproducibility.


Monitor Quality: Track viability and yield metrics to assess and adjust.
Conclusion
Using Lab Cell Strainers like the UberStrainer for PBMC isolation from bone marrow significantly enhances efficiency, purity, and consistency in laboratory workflows. Traditional methods often involve multiple handling steps, increasing the risk of cell damage and sample loss. UberStrainer addresses these challenges with a modular design that supports both small and large volumes, precise pressure control for gentle filtration, and a wide range of mesh sizes suited for various sample types. What sets UberStrainer apart is its built-in recovery system, which allows researchers to retrieve valuable cells without additional processing or equipment.
When combined with particle separation techniques like density gradient centrifugation or magnetic-activated cell sorting (MACS), UberStrainer plays a critical role in ensuring clean, viable PBMC populations. These cells are essential for downstream applications including immunophenotyping, functional assays, and translational research. For labs looking to refine their bone marrow protocols, UberStrainer offers an effective upgrade—simplifying the process while boosting reproducibility and results.

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