Yogurt milk protein

Products prepared from soy protein products and resembling chicken, ham, frankfurters, and bacon are available commercially. Soy protein isolates are used in place of milk proteins or sodium caseinate in products such as coffee creamers, whipped toppings, yogurt, and infant formulas (see Dairy substitutes). Soy protein products also are used in snacks and in baked foods. 

In making yogurt, milk is initially heated at SO C for 15-30 min in order to denature the mhey proteins. This heating provokes the whey proteins to denature, and consequently associate with the casein micelles, resulting in a yogurt with improved viscosity and texture (Law and Leaver, 1997 Boyeef jiL, 1997 Ottecl ai, 1996). 

The proteins of milk are made up of caseins and whey proteins. Milk proteins, caseins, and several enzymes, mainly hydrolases and oxidoreductases, are very important in the manufacturing of cheeses and yogurts (Figure 2.3). After drying they are used in the food industry as milk powder, caseinates, and casein hydrolyzates. Nonprotein nitrogenous compounds constitute about 0.2% of milk.. 

Yogurt is produced from milk by the action of dairy bacteria. These bacteria produce lactic acid as a by-product of their metabolism. The pH decrease causes the milk proteins to coagulate. Why are food preservatives not required to inhibit the growth of bacteria in yogurt ... 

Figure 7 Allergenic character of products obtained from cow s milk proteins by food processing or enzymatic modifications. (1) Cow s milk (2) Na-caseinate (3) kefir (4) yogurt (5) cheese (6,7,8) a-chymotryptic, tryptic, and peptic hydrolysates of casein, respectively (9,10,11) a-chymotryptic tryptic, and peptic EPM products of casein, respectively (12,13) a-chymotryptic and tryptic EPM products of casein, respectively, with methionine enrichment (14,15) fractions of a-chymotryptic EPM products of casein (16,17) fractions of peptic EPM products of casein (18) commercial hypoallergenic formula.

Modler, H. W., and Kalab, M. (1983). Microstructure of yogurt stabilized with milk proteins. J. Dairy Sci. 66, 430-437. 

Acids and Bases Hydrogen bonds between polar R groups salt bridges Lactic acid from bacteria, which denatures milk protein in the preparation of yogurt and cheese... 

In similar concentrations, Irish moss extract, by virtue of its peculiar thickening properties in the presence of many proteins, has been advantageously used to suspend the milk solids in buttermilk and yogurt. 

The consumption of dairy products plays a significant role in providing high-quality protein, vitamins, minerals, and other bioactive compounds to the American diet. Dairy products are consumed fresh in the United States in the form of fluid milk, cheese, yogurt, butter, and ice cream. Dried and condensed products such as nonfat dried milk, whey, whey protein concentrates, and isolates are also produced which are used as ingredients to boost the nutritional and functional properties of a host of other food... 

Immunotechniques have recently been developed to detect food contaminants, e.g., toxins, growth hormone, antibiotics, pesticides, and herbicides. Penicillin (62) in milk, aflatoxins and mycotoxins (63, 64, 65) in milk, cheeses, yogurt, corn have been detected by immunosensors. Characteristics of protein and receptors in or on the cell surface were used in detecting pathogens such as Listeria and Salmonella by immunosensors (11, 66). The principle of immunosensors has also been applied in pesticide determinations (67, 68). 

Nonbacterial milk components and components produced from milk fermentation may also contribute to the immunostimulatory activity of yogurt. Peptides and free fatty acids generated by fermentation have been shown to enhance the immune response. Milk components such as whey protein, calcium, and certain vitamin and trace elements also can influence the immune system. 

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