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Density measurement of milk and dairy products - .PDF file.

Milk is a very complex liquid that is composed of an expansive diversity of different molecular species. Being the product of mammary glands, milk is the primary food source for neonatal mammals. Even if sheep, goats, camels or donkeys are the main suppliers of milk and milk products in certain parts of this globe, the milk from cows is still the main source for dairy products and will therefore subsequently be looked at in more detail.

There are many factors that affect the composition of raw milk such as the cow‘s breed, age and physical state of the cow as well as seasonal variations in the animal’s diet. Therefore only an approximate milk composition of 87–88% water and 12–13 % total solids can be given. The total solids consist of approx. 4% fat and 9% solids-not-fat (SNF) such as proteins, lactose, minerals, vitamins, and many more.

The density of raw milk depends on its composition and temperature and can usually – literature data vary slightly – be found in the range of 1.026 g/cm3 – 1.034 g/cm3 at 20°C.

Since milk is a multi-component system it is not possible to determine the concentration of one component only by density measurement. Yet, the density measurement of milk quickly indicates deviations from the normal milk composition due to e.g. addition of water. Addition of 10% water to the milk will result in a density decrease of approx. 0.003 g/cm3.

Infrared analysis (IR) is a well-established and widely used method for routine analyses of e.g. milk proteins, fat or carbohydrates, density measurement is a most useful control method for indicating deviations from the normal milk composition.

For a quick quality check of the delivered raw milk the portable DMA 35 and DMA 500 density meters are most suitable.

Download the application report above.

Anton Paar Ltd

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

It is the world leader in the measurement of density, concentration and CO2 and in the field of Rheometry. Other areas of specialty are: Viscometry, Polarimetry, Refractometry, Microwave Sample Preparation & Synthesis, Chemical and Mechanical Surface and Nanostructure Analysis.

With over 2200 employees at the headquarters in Graz (Austria) and the 25 sales subsidiaries worldwide, Anton Paar ensure that their products live up to their excellent reputation. The core competence of the company – high-precision production – and close contact to the scientific community form the basis for the quality of Anton Paar’s instruments.

A strong sales network in more than 110 countries guarantees customers rapid support and answers to their application and service queries.

Innovation is the basis for progress and every year Anton Paar invests more than 20 percent of the annual turnover in R&D.

Anton Paar Limited, a subsidiary of Anton Paar GmbH, provides sales, application support and service to users across the UK and Ireland.

With an office in St Albans (UK) and Dublin (Ireland) and a team of over 30 dedicated employees, Anton Paar Limited aims to provide first-class service at every stage in the customer relationship, ensuring our products live up to their excellent reputation.

Anton Paar Ltd
Unit F, The Courtyard
St Albans
AL4 0LA
UK

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