By A. K. H. MacGibbon, M. W. Taylor (auth.), P. F. Fox, P. L. H. McSweeney (eds.)
The Advanced Dairy Chemistry sequence was once first released in 4 volumes within the Nineteen Eighties (under the name Developments in Dairy Chemistry) and revised in 3 volumes within the Nineties. The sequence is the top reference on dairy chemistry, delivering in-depth assurance of milk proteins, lipids, lactose, water and minor constituents.
Advanced Dairy Chemistry quantity 2: Lipids, 3rd variation, is exclusive within the literature on milk lipids, a vast box that incorporates a assorted diversity of subject matters, together with synthesis of fatty acids and acylglycerols, compounds linked to the milk fats fraction, analytical points, habit of lipids in the course of processing and their influence on product features, product defects bobbing up from lipolysis and oxidation of lipids, in addition to dietary value of milk lipids.
Most subject matters integrated within the moment variation are retained within the present variation, which has been up-to-date and significantly multiplied. New chapters disguise the subsequent matters: Biosynthesis and dietary value of conjugated linoleic acid, which has assumed significant importance in the past decade; Formation and organic importance of oxysterols; The milk fats globule membrane as a resource of nutritionally and technologically major items; actual, chemical and enzymatic amendment of milk fats; value of fats in dairy items: lotions, cheese, ice cream, milk powders and child formulae; Analytical tools: chromatographic, spectroscopic, ultrasound and actual methods.
This authoritative paintings summarizes present wisdom on milk lipids and indicates parts for additional paintings. it is going to be very beneficial to dairy scientists, chemists and others operating in dairy study or within the dairy industry.
P.F. FoxPh.D., D.Sc. is Professor Emeritus of nutrition Chemistry and
P.L.H. McSweeney Ph.D., is Senior Lecturer in meals Chemistry at collage collage, Cork, Ireland.
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Extra info for Advanced Dairy Chemistry Volume 2 Lipids
2. Carotenoids The principal pigment in milk fat is b-carotene, accounting for about 95% of the total carotenoids present. In milk, b-carotene is found in the core of the milk fat globules and is absent from the membrane (Jensen and Nielsen, 1996). The concentration of b-carotene in milk depends on the level of b-carotene in feed and on the breed of cow. Carotenoid pigments are particularly high in fresh grass, but substantially lower in a mix of concentrate and hay, a normal winter feed. Channel Island cows, Jerseys and Guernseys, have a higher level of b-carotene and a lower level of vitamin A in their milkfat than other breeds, such as Friesians.
Vitamin E is an eVective scavenger of lipid peroxy radicals and is eYcient at protecting unsaturated fatty acids against lipid peroxidation. The chemistry of vitamin E is rather complex as there are eight compounds, four tocopherols and four tocotrienols, which exhibit vitamin E activity. 03 for d-tocopherol. In milk, a-tocopherol accounts for virtually all of vitamin E, although very small amounts of btocopherols and g-tocopherols are present. Also, the concentration of a-tocopherol in milk fat varies widely, with the level in samples of commercial butter ranging from 18 to 35 mg=g fat (MAFF, 1999).
1984). The total vitamin A bioactivity can be obtained by summation of the concentrations and activities of the diVerent forms of vitamin A. In milk fat, this gives an average value of approximately 12 retinol equivalents/g fat or 40 IU/g fat. Vitamin E is an eVective scavenger of lipid peroxy radicals and is eYcient at protecting unsaturated fatty acids against lipid peroxidation. The chemistry of vitamin E is rather complex as there are eight compounds, four tocopherols and four tocotrienols, which exhibit vitamin E activity.