NEW DEVELOPMENTS IN EMULSIONS AND FOAMS
The University of Manchester, UK
12 December 2005 - 14 December 2005 Application of multisample analytical centrifugation for fast evaluation of long term stability and freeze/thaw stability of emulsions
T. Sobisch, D. Lerche
L.U.M. GmbH, Rudower Chaussee 29 (OWZ), 12489 D-Berlin, Germany,
www.lum-gmbh.com, info@lum-gmbh.de
T. Wharton
Christison Particle Technologies Limited, Albany Road, Gateshead, NE8 3AT, UK
The development of emulsion based products as well as process development/monitoring and quality assurance require efficient and objective analytical tools for shelf life prediction and stability determination. Freeze/thaw stability is often used as measure of long term stability. On the other hand high freeze/thaw stability is often required as a material property. To this end the potential of multisample analytical centrifugation was evaluated as an accelerated test procedure.
A new multisample approach is presented using analytical centrifugation (STEP-Technology), which allows for an accelerated characterization of destabilization processes (creaming, sedimentation, coalescence, phase separation). The kinetics of these destabilizing processes can be traced simultaneously for up-to 12 different samples with temperature control in the range between 4 and 45 °C.
Analytical centrifugation measures in a rapid way the inherent stability of the samples. Therefore, alterations due to slow aging may be investigated combining first a shorted common accelerated stability test like freeze/thaw cycling and second a rapid evaluation by analytical centrifugation.
The wide application potential of this approach is demonstrated by examples of measurements on cosmetic creams and beverages.
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