Measuring particle size (typically below 1µm) in the food industry using the Zetasizer Nano
The Malvern Zetasizer Nano S and ZS offer the ability to measure size (mainly submicron) at high concentration. This is extremely useful for the measurement of food and flavour emulsions which can be measured with no or minimal dilution reducing the risk of the sample aggregating as a consequence of its preparation.
The systems have exceptional sensitivity, which enables the measurement of the size of molecules such as proteins and polysaccharides in solution, to provide information on the state of aggregation.
Food applications include the absorption of proteins and polysaccharides to oil droplets. This has included studies of the absorption of lecithin to casein stabilized emulsions which is used to help stabilize milk as it undergoes treatment to produce UHT milk.
Dynamic light scattering has also been used to study and explain the gelation of pectin (used in jams and jellies). Further information on studying jams and jellies can be obtained from rheological testing, such as characterizing the sol-gel transition.
Brochures:
Brochure: Zetasizer Nano ZS Download the Zetasizer Nano ZS Brochure
Web seminars available for play back:
Web seminar: Size Quality Report in the Zetasizer Nano Software - 9th Mar 2006 The quality of data obtained from a dynamic light scattering (DLS) measurement is paramount to the reliability of the result obtained. To simplify the interpretation of the data from a dynamic light scattering measurement, a size quality report has been developed for the Zetasizer Nano range of instruments. This presentation discusses the tests used in this quality report and uses example results to demonstrate the warning messages that can be expected from poor data. Details of possible actions of how to improve the results will also be discussed.
Web Seminar: The Effects of Particle Interactions in High Concentration Sizing Measurements - 7th July 2004 How can you be sure that a particle size is the same in dilute solution and in formulation? This seminar takes us through understanding particle interactions, multiple scattering, excluded volume and electrostatic problems and solutions.
