The mechanisms involved in cleaning a heterogeneous, multicomponent baked food soil off stainless steel surfaces in aqueous solutions were investigated using novel tools to quantify changes in the soil in situ and in real time: fluid dynamic gauging (thickness, voidage); millimanipulation (adhesive strength, removal force); TOC assays (soil leaching); and droplet image analysis (fat and oil release). Swelling of the soil was accompanied by a reduction in soil strength and preceded the release of oil droplets: the latter did not affect removal forces. The effect of pH, temperature, and surfactants (CTAB, SDBS and TX-100) was investigated and quantified using simple zeroth and first order kinetic models. Whilst increasing temperature from 20 °C to 50 °C enhanced swelling and reduced adhesion forces, the impact of pH and surfactant varied and simple rules to predict cleaning of this complex food soil could not be extracted.
CITATION STYLE
Cuckston, G. L., Suleiman, N., Goodwin, J., Groombridge, M., & Wilson, D. I. (2022). Elucidating the cleaning of complex food soil layers by in-situ measurements. Food and Bioproducts Processing, 132, 52–67. https://doi.org/10.1016/j.fbp.2021.12.006
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