Laboratory cell strainers: how can a homogeneous cell suspension be obtained?

Essential in cell culture and flow cytometry, cell strainers deliver homogeneous, reproducible suspensions. Their nylon mesh mounted on a polypropylene frame retains aggregates and debris while preserving cell viability. Available as a clip-on for 50 mL conical tubes or in a basket style, they come in 40/70/100 µm to suit every sample. Sterile and with low extractables, they minimise needle clogging, improve measurement reliability and speed up preparation of a high-quality single-cell suspension. Colour coding, practical rims and individually wrapped units make handling easier inside the microbiological safety cabinet (MSC).

What types of cell strainers are available, and how do you choose the right one?

Two main formats are available. Cell strainers for 50 mL tubes clip onto the rim of the conical tube for hands-free, splash-free filtration, ideal in a Class II BSC and for routine workflows. The other versions (basket/funnel style) sit on a plate or tube and suit variable volumes or serial filtrations. In both cases, the monofilament nylon mesh (PP frame) ensures low non-specific binding and a smooth flow.

Start by choosing the mesh size: 40 µm to obtain truly monodisperse suspensions (single-cell preps, demanding flow cytometry), 70 µm for most cultures (balance between throughput and quality), 100 µm for viscous or debris-rich samples (homogenates, organoids). Stackable models allow sequential prefiltration (100 ? 70 ? 40 µm) to limit clogging and maximise cell yield.

On performance, prioritise sterile, DNase/RNase-free, pyrogen-free strainers with low extractables, supplied individually or in blister packs. Wide rims and pour spouts make recovery easier, while colour coding speeds up identification at the bench. Most are single-use and not autoclavable; a gentle buffer rinse can limit adsorption. Chemical compatibility: mainly for aqueous media (alcohol OK per manufacturer), avoid aggressive solvents.

Key selection criteria: format (clip-on 50 mL vs basket), mesh size, sterility and packaging, desired flow rate, compatibility with your tubes/plates, shear-stress risk, and budget (bulk packs vs individually wrapped).

Mesh size	Principle	Applications
40 µm	Retains small aggregates, lets single cells pass	Single-cell preps, flow cytometry, finely dissociated tissues
70 µm	Throughput/quality compromise	Routine filtration before counting and seeding
100 µm	Prefiltration of large debris, high throughput	Large cells, organoids, viscous homogenates

In which fields are cell strainers used?

• Life sciences: preparation of monodisperse suspensions after tissue dissociation, clarification prior to flow cytometry, counting, seeding, single-cell omics.
• Pharmaceutical/biotech: particle control, homogenisation before potency assays, gentle filtration of organoids and micro-tissues.
• Microbiology and environmental: pre-filtration of loaded matrices (soils, waters, algae) before culture, PCR or enumeration.
• Agri-food/cosmetics/chemistry: removal of lumps in homogenates or formulations prior to rheological or spectral analyses.
Cross-cutting benefits: less clogging of needles and nozzles, viability better preserved, more stable measurements and reduced preparation time.

Available cell strainers

Frequently asked questions about cell strainers

Which mesh size should I use for flow cytometry?
70 µm covers most applications. Choose 40 µm if you need a highly monodisperse suspension or are running small nozzles.

Are the strainers reusable?
No, they are single-use disposables. Reuse increases the risk of contamination and adsorption, and compromises sterility.

Can I speed up filtration by centrifugation?
Some models tolerate low g-forces. Always check the manufacturer’s instructions to avoid frame deformation and shear.

How can I minimise cell loss on the mesh?
Pre-wet with buffer, work at low pressure, and rinse the mesh with a few mL of medium to recover retained cells.

Are the strainers compatible with solvents?
Nylon/PP are suitable for aqueous media and alcohols. Avoid aggressive solvents (ketones, chlorinated hydrocarbons). Refer to the chemical compatibility chart.

Are there versions for 15 mL tubes?
Yes, some basket-type formats fit various tube/plate diameters. Check the diameter and any available adaptors.

Which packaging should I choose in a microbiological safety cabinet (MSC)?
Sterile strainers in individual pouches reduce handling. Bulk packs are cost-effective for serial routines in the cabinet.