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Structural changes in sweetened condensed milk during storage: an electron microscopy study

Published online by Cambridge University Press:  01 June 2009

A. I. Alvarez de Felipe ,
Berta Melcón  and
Julián Zapico
A. I. Alvarez de Felipe
Affiliation:
Laboratorio de Fisiología Animal, Departamento de Fisiología, Farmacología y Toxicología, Facultad de Biología, Universidad de León, 24007 León, España
Berta Melcón
Affiliation:
Laboratorio de Fisiología Animal, Departamento de Fisiología, Farmacología y Toxicología, Facultad de Biología, Universidad de León, 24007 León, España
Julián Zapico
Affiliation:
Laboratorio de Fisiología Animal, Departamento de Fisiología, Farmacología y Toxicología, Facultad de Biología, Universidad de León, 24007 León, España
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Summary

This work aimed to relate changes in rheological behaviour with structural details of different sweetened condensed milk samples as well as to clarify the role of additives in delaying gelation. To study the process of gelation, rheological techniques were applied to fresh and stored condensed milk samples for times and at temperatures known to favour gelation (45 d at 37 °C). Electron microscopy techniques were used to relate the rheological changes with observed structural details. Examination by electron microscopy showed that micellar aggregation and association of casein micelles with fat globules increased during storage. The whey proteins appeared to play an important role in the thickening process.

Type
Original Articles
Information
Journal of Dairy Research , Volume 58 , Issue 3 , August 1991 , pp. 337 - 344
Copyright
Copyright © Proprietors of Journal of Dairy Research 1991

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References

REFERENCES

Anderson, M., Brooker, B. E., Cawston, T. E. & Cheesman, G. C. 1977 Changes during storage in stability and composition of ultra-heat-treated aseptically-packed cream of 18% fat content. Journal of Dairy Research 44 111–124CrossRefGoogle Scholar
Anon. 1900 Mesure de Caractéristiques rhéologiques. Zurich: Contraves AGGoogle Scholar
Bixby, H. H. & Swanson, A. M. 1969 Improvement of computer predictions of optimum processing conditions for sterilized milk products through the use of raw milk data. Journal of Dairy Science 52 892Google Scholar
Buchheim, W. 1974 The applicability of electron microscopy for studying the structure of liquid and solid foods. Proceedings of the 4th International Congress of Food Science and Technology Vol II 5–12Google Scholar
Carroll, R. J., Thompson, M. P. & Melnychyn, P. 1971 Gelation of concentrated skimmilk: electron microscopic study. Journal of Dairy Science 54 1245–1252CrossRefGoogle Scholar
Davies, F. L., Shankar, P. A., Brooker, B. E. & Hobbs, D. G. 1978 A heat-induced change in the ultrastructure of milk and its effect on gel formation in yoghurt. Journal of Dairy Research 45 53–58Google Scholar
Fiske, C. H. & Subbarow, Y. P. 1925 The colorimetrie determination of phosphorus. Journal of Biological Chemistry 66 375–400CrossRefGoogle Scholar
Hart, F. L. & Fisher, H. J. 1971 Análisis Moderno de los Alimentos p. 163. Zaragoza: AcribiaGoogle Scholar
Haugen, P. & Tung, M. A. 1976 Rheograms for power-law fluids using coaxial cylinder viscometers and a template method. Canadian Institute of Food Science and Technology Journal 9 98–104Google Scholar
Holt, C., Davies, D. T. & Law, A. J. R. 1986 Effects of colloidal calcium phosphate content and free calcium ion concentration in the milk serum on the dissociation of bovine casein micelles. Journal of Dairy Research 53 557–571Google Scholar
Kalab, M., Allan-Wojtas, P. & Phipps-Todd, B. E. 1983 Development of microstructure in set-style nonfat yoghurt—a review. Food Microstructure 2 51–66Google Scholar
Kalab, M., Phipps-Todd, B. E. & Allan-Wojtas, P. 1982 Milk gel structure, XIII. Rotary shadowing of casein micelles for electron microscopy. Milchwissenschaft 37 513–518Google Scholar
Krieger, J. M. & Elrod, H. 1953 Direct determination of the flow curves of non newtonian fluids. 11. Shearing rate in the concentric cylinder viscometer. Journal of Applied Physics 24 134142CrossRefGoogle Scholar
Leviton, A. & Pallansch, M. J. 1962 High temperature-short-time sterilized evaporated milk. IV. The retardation of gelation with condensed phosphates, manganous ions, polyhydric compounds, and phosphatides. Journal of Dairy Science 45 1045–1056CrossRefGoogle Scholar
Melnychyn, P. & Wolcott, J. M. 1965 Evidence of specific interactions of inorganic ions with milk proteins. Proceedings of Seventh Milk Concentrate Conference, Philadelphia, PA pp. 26–30Google Scholar
Noda, K., Endo, M. & Takahashi, T. 1976 [Studies on the physicochemical changes of sweetened condensed milk during storage.] Japanese Journal of Zootechnical Science 47 719–724Google Scholar
Prentice, J. H. 1984 Measurements on some fluids and their interpretation. Measurements in the Rheology of Foodstuffs pp. 108–129. London: Elsevier Applied Science PublishersGoogle Scholar
Radajewa, I. A. 1980 Productos lácteos de larga conservación. Repertorio de artículos de leche condensada. Fabricación de Productos Lácteos pp. 257–265Zaragoza: AcribiaGoogle Scholar
Rose, D. & Colvin, J. R. 1966 Internal structure of casein micelles from bovine milk. Journal of Dairy Science 49 351–355CrossRefGoogle ScholarPubMed
Rowland, S. J. 1938 The determination of the nitrogen distribution in milk. Journal of Dairy Research 9 42–46CrossRefGoogle Scholar
Samel, R. & Muers, M. M. 1962 a The age-thickening of sweetened condensed milk. I. Rheological properties. Journal of Dairy Research 29 249–258CrossRefGoogle Scholar
Samel, R. & Muers, M. M. 1962 b The age thickening of sweetened condensed milk. II. Effects of temperature and of storage. Journal of Dairy Research 29 259–267CrossRefGoogle Scholar
Samel, R., Weaver, R. W. V. & Gammack, D. B. 1971 Changes on storage in milk processed by ultra-high-temperature sterilization. Journal of Dairy Research 38 323–332CrossRefGoogle Scholar
Sawyer, W. H. 1969 Complex between βlactoglobulin and κ-casein. A review. Journal of Dairy Science 52 1347–1355Google Scholar
Sheehefer, M. E. 1967 The development and manufacture of sterilized milk concentrate. FAO Agricultural Series no. 72Google Scholar
Sone, T. 1972 Abnormal flow properties of foodstuffs. In Consistency of Foodstuffs 2nd edn (1969, translated) pp. 149–157Holland: Reidel Publishing Co.Google Scholar
Webb, B. H. 1970 Condensed products. In Byproducts from Milk, 2nd edn pp. 106–123 (Eds Webb, B. H. and Whittier, E. O.). Westport, CT: Avi Publishing Co. Inc.Google Scholar
West, D. W. 1986 Review article. Structure and function of the phosphorylated residues of casein. Journal of Dairy Research 53 333–352Google Scholar