Butyrometer Centrifuge for Milk Fat Determination

What is the Butyrometer Centrifuge for Milk Fat Determination?

A butyrometer centrifuge determines milk fat by the Gerber method, separating fat under centrifugal force after acid digestion in a graduated butyrometer. It is the standard rapid, low-cost test at dairy intake.

Overview

Sulfuric acid digests the milk proteins in a butyrometer tube, releasing fat, and amyl alcohol is added to sharpen the boundary. The tube is centrifuged briefly, and the fat column rises into the graduated neck where its volume is read directly as fat percentage. The whole test takes about 10 to 15 minutes with a heated centrifuge, and the method suits cow, buffalo, goat and sheep milk once the acid concentration and tube calibration are set for each type. Because the measurement is volumetric, tube calibration and consistent technique are essential, and temperature control keeps readings reproducible. The Gerber method is widely accepted for payment and intake decisions, while reference gravimetric methods are used for disputes and calibration.

How does it work?

Fat is not a single compound but a mixture of triglycerides, phospholipids and other lipids, so methods recover an operationally defined fraction. Soxhlet extraction repeatedly cycles a solvent such as petroleum ether or hexane through the sample, dissolving lipids that are then weighed after solvent evaporation. The Randall method shortens this by immersing the sample in boiling solvent before the rinsing step. Acid hydrolysis with hydrochloric acid releases fat bound in proteins and cell walls before extraction, which raises recovery for dairy, meat and baked products. The Roese-Gottlieb and Mojonnier procedures use ammonia, alcohol and a mixed solvent for dairy products. Pulsed NMR measures the hydrogen signal of liquid fat directly, without solvent, after calibration against a reference method.

What are the key features?

• Heated centrifuge designed for butyrometer tubes
• Direct volumetric reading in fat percentage
• Capacity for 8–24 butyrometers per run
• Temperature control for reproducible readings
• Gerber method reagents and calibrated tubes
• Test time of about 10–15 minutes

What are the technical specifications?

A typical butyrometer centrifuge for milk fat determination configuration offers method of Gerber (acid digestion and centrifugation), capacity of 8–24 butyrometers, speed of 300–1200 rpm, heating of Up to 65 °C, thermostatically controlled, tube volume of 10.75 mL or 11 mL milk and fat reading range of 0–8 percent scale. 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 Butyrometer Centrifuge for Milk Fat Determination is used in milk intake testing and payment, cream, cheese milk and yoghurt mix control, small dairy and farm laboratory testing and rapid fat screening before instrumental analysis. Across the wider Fat Analyzers class, laboratories also deploy it for total fat determination for nutrition labelling, feed and pet food crude fat control and dairy product fat standardisation and pricing.

Which standards and certifications apply?

Relevant standards and methods include ISO 1443, ISO 1735, ISO 3433, AOAC 920.39, AOAC 989.05 and ISO/IEC 17025. 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.

Solvent extraction requires ventilation, fume extraction and solvent recovery, and laboratories must follow local rules for flammable and chlorinated solvents. Extraction thimbles, boiling stones and drying ovens must be clean and the drying step controlled, because residual solvent and moisture bias the weighed fat. Acid hydrolysis needs careful handling of hot hydrochloric acid and adequate rinsing to remove acid before extraction. NMR analysers must be calibrated and temperature-stabilised, and calibration transfer between instruments should be demonstrated. Reference standards, duplicate determinations and participation in proficiency testing are expected for accredited laboratories.

How do I select the right Butyrometer Centrifuge for Milk Fat Determination?

Choose a butyrometer centrifuge when you need rapid, low-cost milk fat results at intake and the Gerber method is acceptable to your customers. Confirm capacity, heater control and that calibrated tubes are available for the fat range you measure. Keep reference gravimetric comparisons for disputes and calibration.

How does it compare with other Fat Analyzers variants?

Choose the method from the product and the fat fraction you must report. Soxhlet and Randall systems are the classic reference methods for free fat in feed, cereals and snack products, with Randall offering faster runs and lower solvent use. Acid hydrolysis extraction is required when fat is bound within the matrix, as in dairy powders, meat products and bakery goods. Roese-Gottlieb or Mojonnier procedures are standard for milk and dairy products. Pulsed NMR gives solvent-free results in minutes and suits routine control of oilseeds, chocolate and snack products once calibrated against a reference method. For milk fat specifically, butyrometer centrifugation remains a rapid, low-cost screening method on the intake platform.