Laboratory Potter-Elvehjem homogenisers: how can cells and tissues be homogenised gently?

The Potter-Elvehjem homogenisers are the benchmark for gentle homogenisation of tissues and cell suspensions. Made up of a grinding tube in borosilicate 3.3 glass and a pestle (often in PTFE on a stainless-steel shaft), they deliver controlled shear that preserves organelles and enzyme activity. Hand-operated or coupled to a low-speed drive, they cover day-to-day needs in cell biology, biochemistry, pharma/biotech, cosmetics and quality control, for typical volumes from a few hundred µL to a few tens of mL.

Which components make up a Potter (Potter-Elvehjem) homogeniser, and how do you choose them?

A Potter system comprises three core elements: the grinding cylinder, the matched tube + pestle assembly, and the “pellet” pestle for pellets. The cylinder, made from thick, graduated borosilicate 3.3 glass, provides chemical resistance and clear visibility to monitor lysate texture. The PTFE pestle on a stainless-steel rod delivers a controlled clearance against the wall, ensuring consistent shear with minimal heat build-up. Matched assemblies give optimal contact and improved reproducibility. The “pellet” pestle, with a shaped tip, speeds up uniform resuspension of cell pellets.

Operation: slow rotation of the pestle within the tube (by hand or via an overhead stirrer/drive) creates a shear gradient that breaks down soft tissues and releases intracellular contents while preserving fragile organelles (mitochondria, nuclei). It’s the go-to tool where a rotor–stator would be too harsh.

Selection criteria:
• Working volume (e.g. 1, 5, 15, 30–50 mL) aligned with tissue mass and buffer.
• Tight or standard clearance according to desired fineness and sample type.
• Materials (borosilicate glass, PTFE, stainless rod) for chemical compatibility and autoclaving.
• Motor drive: check rod length, adapter and recommended speed (low speed to limit heating and foaming).
• Hygiene & safety: simple disassembly, smooth surfaces, sterilisation resistance.

Benefits: reproducible workflow, gentle homogenisation, low energy, long component life. Limitations: modest volumes and very fibrous tissues are more challenging.

Type	Principle	Applications
Grinding tube	Calibrated borosilicate glass tube, smooth bore	Replacement, volume selection; visual inspection
Tube + pestle assembly	PTFE pestle matched to tube (controlled clearance)	Soft tissues, cell lysates, organelle isolation
“Pellet” pestle	Tip optimised for resuspension	Resuspension of pellets, cell washing, routine QC

In which application areas is a Potter-Elvehjem homogeniser used?

• Life sciences : tissue homogenisation (liver, brain), gentle cell lysis, preparation of lysates for Western blotting, enzyme activity assays, extraction of soluble proteins.
• Cell biology & organelles : isolation of mitochondria, nuclei and peroxisomes while preserving integrity; preparation of S9 and subcellular fractions.
• Pharma & biotech : biologics formulation development, enzymatic release testing, QC of biological raw materials.
• Cosmetics : preparation of biological extracts, QC of natural-origin raw materials, texture evaluation of cell suspensions.
• Food & beverages : homogenisation of biological samples (yeasts, soft plant matrices) for microbiological and enzymatic analyses.
• Environment : preparation of extracts from biofilms or aquatic tissues for biomarker analyses.
• QC & training : resuspension of pellets (pellet pestle), routine protocols, training in gentle homogenisation techniques.

Available components for Potter-Elvehjem homogenisers

Frequently asked questions about Potter homogenisers

What is the difference between Potter–Elvehjem and Dounce?
Potter: PTFE pestle in glass, consistent, robust shear. Dounce: glass-on-glass, two pestles (A/B) for very low shear, ideal for fragile cells.

What volumes are covered?
Typically 0.5 to 50 mL depending on the cylinder. Choose a capacity close to the sample to maximise pestle–wall contact and efficiency.

How do I choose the clearance?
A tight clearance gives finer homogenisation but needs more effort. A standard clearance is sufficient for soft tissues and pellet resuspension.

Can a Potter be motorised?
Yes, at low speed. Check shaft and adaptor compatibility and keep the rotation slow to limit heating and foaming.

Is it autoclavable?
Borosilicate cylinder and PTFE pestle are generally autoclavable (121 °C). Remove the stainless-steel rod if needed and dry thoroughly after the cycle.

Chemical compatibility and solvents?
Borosilicate glass and PTFE offer broad compatibility. Avoid solvents that attack seals or lubricants; rinse promptly after use.

Safety tips for use?
Handle glass with gloves and safety glasses. Do not force through very fibrous tissues; match the volume and pre-wet with buffer to reduce friction.