Rotor-Stator Homogenizer

What is the Rotor-Stator Homogenizer?

A rotor-stator homogenizer draws the sample into a narrow gap and applies high shear. It disrupts tougher material, cells and emulsions and handles larger volumes than a simple blade blender in the laboratory.

Overview

A rotor-stator homogenizer consists of a rapidly spinning rotor inside a stationary stator, with a small gap between them. The rotor draws the sample into the gap and expels it at high velocity, creating intense shear, turbulence and cavitation that disrupt cells, break emulsions and reduce particle size. Generators of different diameters and slot patterns suit different volumes and viscosity, and the unit can be hand-held for tubes or mounted for larger vessels. Because the shear zone is localised, heating is moderate and can be limited by short runs and cooling. The design handles tough fibrous tissue, emulsions and suspensions and is widely used in biology, food and chemistry.

How does it work?

Homogenizers reduce particle size and mix components so that any portion of the sample represents the whole. Blade homogenizers spin a sharp blade at high speed to chop and blend tissue or food. Rotor-stator homogenizers draw the sample into a narrow gap between a fast rotor and a stationary stator, creating intense shear that disrupts cells and emulsions. High-pressure homogenizers force the sample through a small valve under pressure, so shear, impact and cavitation break droplets and cells. Bead mill homogenizers shake the sample with small beads to grind and lyse material in tubes. Ultrasonic homogenizers use cavitation from a vibrating probe to disrupt cells and disperse particles.

What are the key features?

• Rotor and stator generating high shear
• Interchangeable generators for different volumes
• Hand-held probe or mounted configurations
• Disrupts cells, emulsions and fibrous tissue
• Localised shear limits bulk heating

What are the technical specifications?

A typical rotor-stator homogenizer configuration offers working volume of 0.1–5,000 mL, speed range of 5,000–30,000 rpm, stator diameter of 5–25 mm, typical particle size of 1–50 µm, contact material of Stainless steel 316L and motor power of 0.3–1.5 kW. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Rotor-Stator Homogenizer is used in cell and tissue disruption, food emulsion preparation, microbiological sample preparation and cosmetic and pharmaceutical dispersion. Across the wider Homogenizers class, laboratories also deploy it for food and feed microbiological preparation, tissue and cell disruption and emulsion and nanoparticle dispersion.

Which standards and certifications apply?

Relevant standards and methods include ISO 6887-1, ISO 6497, EPA 3050B, ISO 17635 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Keep the working part and the sample cool, since homogenisation generates heat that can degrade proteins, nucleic acids and volatile analytes. Clean and, where necessary, sterilise probes, blades and chambers between samples to avoid cross-contamination. Use the smallest effective volume and the shortest time that gives a uniform sample, and record the settings in the method. For microbiological work, follow aseptic technique and validated procedures such as ISO 6887-1. Inspect probes and seals for wear, and handle ultrasonic probes so they do not run dry, which would damage them.

How do I select the right Rotor-Stator Homogenizer?

Select a rotor-stator homogenizer for tough tissue, emulsions or larger volumes where a blade blender is insufficient. Confirm the generator diameter and speed suit the sample volume and viscosity, and that the probe material suits the analytes. For sterile work, check autoclavability; for very small volumes, a bead mill may be preferable.

How does it compare with other Homogenizers variants?

Choose a homogenizer according to the sample type, volume and the purpose of homogenisation. Blade homogenizers suit soft tissue and food at moderate volumes; rotor-stator units handle larger volumes and tougher material; bead mill homogenizers suit small volumes and high-throughput lysis in tubes; high-pressure homogenizers suit emulsions and cell disruption at scale; and ultrasonic homogenizers suit small volumes and nanoparticle dispersion. Confirm the working volume, the achievable particle or droplet size, and whether the sample must remain cool to protect analytes. Consider cross-contamination between samples and whether disposable or autoclavable components are needed for microbiological work.