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A model heat exchange apparatus for the investigation of fouling of stainless steel surfaces by milk II. Deposition of fouling material at 140 °C, its adhesion and depth profiling

Published online by Cambridge University Press:  01 June 2009

Carole L. Foster  and
Margaret L. Green
Carole L. Foster
Affiliation:
AFRC Institute of Food Research, Reading Laboratory, (University of Reading), Shinfield, Reading RG2 9AT, UK
Margaret L. Green
Affiliation:
AFRC Institute of Food Research, Reading Laboratory, (University of Reading), Shinfield, Reading RG2 9AT, UK
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Summary

Formation and adhesion of fouling deposit during heating of milk at a stainless steel surface were studied separately using a model apparatus. The amount of deposit and proportion of minerals present increased with increase in surface temperature. At 140 °C, the amount of deposit formed increased linearly with heating time, becoming more uneven in appearance. The variations of deposit formation at 140 °C with pH of the milk, with fat removal and with preheating were similar to those observed in the final heating section of continuous UHT plants. Deposits containing a higher proportion of protein were easier to remove. The remaining inner layer had a smoother appearance and contained a higher proportion of minerals than the original deposit. Depth profiling, using secondary ion mass spectrometry, showed that protein was concentrated on the outside of deposits with calcium phosphate being concentrated closest to the steel surface.

Type
Original Articles
Information
Journal of Dairy Research , Volume 57 , Issue 3 , August 1990 , pp. 339 - 348
Copyright
Copyright © Proprietors of Journal of Dairy Research 1990

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References

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