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Recent advances in the destabilization of dairy emulsions

Published online by Cambridge University Press:  01 June 2009

Donald F. Darling
Donald F. Darling
Affiliation:
Unilever Research Laboratory, Colworth House, Sharnbrook, Beds., UK
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Summary

Destabilization of emulsion droplets is described in terms of flocculation, coalescence and adsorption processes, and then discussed with reference to various technological aspects of dairy emulsions. A semi-quantitative measurement of homogenization-induced flocculation of cream is described using measurements on the time-dependent decrease in viscosity that occurs during shear. The whipping of cream is discussed in terms of the adsorption of fat droplets to air bubbles and the formation of a fat particle network with the fat directly in contact with air. The whipping of homogenized creams is shown to be dependent upon the structure of the newly formed milk fat globule membrane. Since the major protein component of the membrane is casein, any change in casein micelle stability is reflected in the whipping properties of the cream.

The presence of crystalline fat within emulsion droplets is essential for many destabilization processes. Fat crystals pierce the film between 2 approaching interfaces, thus leading to aggregation. The contact angle between fat crystal, oil and aqueous phase can be used to describe the susceptibility of an emulsion to destabilize.

A quantitative measure of emulsion destabilization under shear is described kinetically in terms of reversible flocculation followed by coalescence. The measurement of emulsion viscosity as a function of time at constant shear stress is used to monitor the aggregation processes and the 3 rate constants evaluated by computer curve fitting.

Type
Short Communication
Information
Journal of Dairy Research , Volume 49 , Issue 4 , November 1982 , pp. 695 - 712
Copyright
Copyright © Proprietors of Journal of Dairy Research 1982

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References

REFERENCES

Buchheim, W. 1970 [The process of fat crystallisation in the fat globules of milk. Electron microscopical studies by means of the freeze etching method] Milchwissenschaft 25 65–70Google Scholar
Buchheim, W. 1974 Electron microscopical studies on the structure of whipped cream. 19th International Dairy Congress, New Delhi IE 245–246Google Scholar
Casson, N. 1959 In Rheology of Disperse Systems (conference 1957) (Ed. Mill, C. C.) London: Pergamon PressGoogle Scholar
Darling, D. F. & Butcher, D. W. 1978 Milk-fat globule membrane in homogenized cream. Journal of Dairy Research 45 197–208CrossRefGoogle Scholar
Eilers, H. 1941 [The viscosity of emulsions of a highly viscous substance as a function of concentration.] Kolloidzeitschrift 97 313–321Google Scholar
Goulden, J. D. S. & Phipps, L. W. 1964 Factors affecting the fat globule sizes during the homogenization of milk and cream. Journal of Dairy Research 31 195–200CrossRefGoogle Scholar
Graf, E. & Muller, H. R. 1965 Fine structure and whippability of sterilized cream. Milchwissenschaft 20 302–308Google Scholar
Heller, W. & Peters, J. 1970 Mechanical and surface coagulation. 1. Surface coagulation of α-FeOOH sols. Journal of Colloid and Interface Science 32 592–605 (See also 33 578–585)CrossRefGoogle Scholar
Honig, E. P., Roebersen, G. J. & Wiersema, P. H. 1971 Effect of hydrodynamic interaction on the coagulation rate of hydrophobic colloids. Journal of Colloid and Interface Science 36 97–109CrossRefGoogle Scholar
Kieseker, F. G. & Zadow, J. G. 1973 a The whipping properties of homogenized and sterilized cream. Australian Journal of Dairy Technology 28 108–113Google Scholar
Kieseker, F. G. & Zadow, J. G. 1973 b Factors influencing the preparation of U.H.T. whipping cream. Australian Journal of Dairy Technology 28 165–169Google Scholar
Labuschagne, J. H. 1962 Churning in the absence of air. Ph.D. Thesis, Agricultural University, Wageningen, The NetherlandsGoogle Scholar
Mohr, W. & Mohr, E. 1955 [Whipped cream – some problems.] Molkerei- und Käsereizeitung 6 34–37Google Scholar
Mulder, H. & Walstra, P. 1974 The Milk Fat Globule. Farnham Royal: CAB and Wageningen: Centre for Agricultural Publishing and DocumentationGoogle Scholar
Ogden, L. V. 1973 Homogenization-indueed clustering of fat globules in cream and model systems. Ph.D. Thesis, University of Minnesota U.S.A. (Dissertation Abstracts International B 34 3292)Google Scholar
Oortwijn, H. & Walstra, P. 1979 The membranes of recombined fat globules. 2. Composition. Netherlands Milk and Dairy Journal 33 134–154Google Scholar
Oortwijn, H., Walstra, P. & Mulder, H. 1977 The membranes of recombined fat globules. 1. Electron microscopy. Netherlands Milk and Dairy Journal 31 134–147Google Scholar
Overbeek, J. Th. G. 1952 Kinetics of flocculation. In Colloid Science, vol. 1, pp. 278–301 (Ed. Kruyt, H. R.), Amsterdam: ElsevierGoogle Scholar
Rothwell, J. 1966 Studies on the effect of heat treatment during processing on the viscosity and stability of high-fat market cream. Journal of Dairy Research 33, 245–254CrossRefGoogle Scholar
Schmidt, D. G. & Van Hooydonk, A. C. M. 1980 A scanning electron microscopical investigation of the whipping of cream. Scanning Electron Microscopy Conference, U.S.A. 3 653–658Google Scholar
Spielman, L. A. 1970 Viscous interactions in Brownian coagulation. Journal of Colloid and Interface Science 33 562–571CrossRefGoogle Scholar
Spielman, L. A. 1978 Hydrodynamic aspects of flocculation. In The scientific basis oftflocculation, pp. 63–88 (Ed. Ives, K. J.) Alphen aan den Rijn, The Netherlands: Sijthoff & NoordhoffCrossRefGoogle Scholar
Te Whaiti, I. E. & Fryer, T. F. 1975 Factors that determine the gelling of cream. New Zealand Journal of Dairy Science and Technology 10 2–7Google Scholar
Van Boekel, M. A. J. S. 1980 Influence of fat crystals in the oil phase on stability of oil-in-water emulsions. Ph.D. Thesis, Wageningen, The NetherlandsGoogle Scholar
Vincent, B. 1974 The effect of adsorbed polymers on dispersion stability. Advances in Colloid and Interface Science 4 193–277CrossRefGoogle Scholar