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Determining the energy of activation for the formation of lactulose in heated milks

Published online by Cambridge University Press:  01 June 2009

Geoffrey R. Andrews
Geoffrey R. Andrews
Affiliation:
** National Institute for Research in Dairying (University of Reading), Shinfield, Reading RG2 9 AT, UK
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Summary

Time/temperature profiles were obtained for commercial ultra high temperature (UHT) and sterilized milk processing plants and for a pilot UHT plant operating under nine different conditions. Samples of milk from each process were analysed for lactulose by an enzymic method, yielding concentrations of lactulose of 4 to 118 mg/100 ml. The measured lactulose concentration could be derived from the corresponding time/temperature profile by assuming an Arrhenius relationship with an activation energy of 152 kJ mol-1, for the whole range of UHT and in-container processes examined.

Type
Original Articles
Information
Journal of Dairy Research , Volume 52 , Issue 2 , May 1985 , pp. 275 - 280
Copyright
Copyright © Proprietors of Journal of Dairy Research 1985

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References

REFERENCES

Adachi, S. & Patton, S. 1961 The presence and significance of lactulose in milk products: a review. Journal of Dairy Science 44 1375–1393CrossRefGoogle Scholar
Al-Roubaie, S. M. A. 1977 Factors affecting deposit formation from heated milk on surfaces. Ph.D. Thesis. University of ReadingGoogle Scholar
Andrews, G. R. 1984 Distinguishing pasteurized, UHT and sterilized milks by their lactulose content. Journal of the Society of Dairy Technology 37 92–95CrossRefGoogle Scholar
Finot, P. A., Deutsch, R. & Bujard, E. 1981 The extent of the Maillard reaction during the processing of milk. Progress in Food & Nutrition Science 5 345–355Google Scholar
Geier, H. & Klostermeyer, H. 1980 [Enzymatic determination of lactulose.] Zeitschrift für Lebensmittel Untersuchung und -Forschung 171 443–445CrossRefGoogle Scholar
Geier, H. & Klostermeyer, H. 1983 Formation of lactulose during heat treatment of milk. Milchwissenschaft 38 475–477Google Scholar
Kessler, H. G. 1981 Food Engineering and Dairy Technology. München: Verlag A. KesslerGoogle Scholar
Richards, E. L. & Chandrasekhara, M. R. 1960 Chemical changes in dried skim-milk during storage. Journal of Dairy Research 27 59–66CrossRefGoogle Scholar