Malcolm Povey, Procter Department of Food Science and Lyn S. Daintree, PhD, Institute of Particle Science & Engineering

Key words: ultrasound, colloidal particles, stability, product characterization, phase separation

Abstract: Changes in the macroscopic nature of aqueous or colloidal formulations can lead to changes in the odor, appearance or feel of a product. Data presented in this article demonstrates ultrasound scanning to determine formulation shelf life and monitor product quality.

Ultrasound scanning is a highly promising new technique for product characterization and stability determination of colloidal and aqueous-based formulations. The stability of colloidal and fluid/particle dispersions is of increasing importance to the cosmetic and personal care industry where differences in raw materials can affect the batch-to-batch quality of products. Additionally, product developers in the industry need tools to predict formulation stability to reduce development time.

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