Special feature of calcium behavior at formation of milk coagula. Part 2. Interrelation of the active calcium dynamics in milk with temperature and active acidity

In the medical science, calcium has been considered to be a mediator of various processes in the alive bodies. At milk processing all processes of bio-transformations of milk components in some measure are connected with calcium ions. Dynamics of the ionic calcium in milk is closely related with temperature and pH. It's worth to note that negative correlation between temperature and concentration of Ca2+ is very high. Suggestion has been made that calcium ions Ca2+ are the first that react to the outer temperature effects on milk. They support ions balance in order to keep algorythmes of the system functioning as a whole and this regards to both protein transformation and conditions in which fermentative reactions take place. The experiment has been carried out that allows establish correlation between Ca 2+ concentration in milk and its active acidity at temperature drop in. The temperature range studied was from 30 to 9 °C with discrete measurements 7 °C. The variants - 4 samples taken from the same portion of fresh milk - differed in consecutive order of passing through the predetermined temperature intervals. The graphic materials given demonstrate that independently of heating and cooling alternations there exist negative correlation between temperature and concentration of the ionic calcium coming to the unit. The highest stability of the Ca2+ concentration is characteristic for the temperature 30 °C. Maximum scattering of pH was observed at the temperature 16 °C that can be explained by coming of the micellar calcium over to soluble form. The results of the experiment demonstrate that alteration of milk cooling and heating in cheese making has certain effects on destabilization of casein micelles that support necessity to correct composition of salts influencing stability of protein components before pasteurized milk clotting.

calcium, milk clots, formation