The development of casein

In foreign countries, especially European and American countries, because of life habit and industrial production level, is a leader in the production process of casein. The most major western countries today for rennet casein casein, this kind of casein and depending on the source of the rennet is divided into three categories: plant rennet casein, animal rennet casein and microbial rennet casein, and microbial rennet casein because of its simple production process, technical improvement potential is tremendous, production stability, thus become the most developed countries the main casein products, production increased year by year. Foreign production of casein by acid method, all fresh milk as raw material, through degreasing, acid precipitation, dehydration, drying, grinding and become, there are few oxidative rancidity, dark yellow color, acidity higher product defects. Hydrochloric acid casein as the mature process of the 80 s, due to high cost, and severe pollution, the proportion of manufacturing enterprise has been in decline.

In terms of production material of casein, western countries mainly in fresh milk as raw materials, product quality is good, but the price also is higher, most of the applications in food industry, as additive, thickening agent, etc. Some vendors using soybean as raw material to produce casein, but this part of the casein as composition, nutrition value and residents' eating habits and other reasons, is rarely used in the food field, mainly used in industrial applications, such as adhesive, additives, colorants, etc. In New Zealand, hydrochloric acid casein is the most commonly used way, for the special also produces a small amount of sulfuric acid casein; In Australia and Europe, hydrochloric acid is the most common precipitating agent. Other technologies have also been trying to used for production of acid casein, such as add acid by ion exchange, or in ion exchange process was developed in France.

At present in domestic, caused by a lack of fresh raw materials, production of casein in milk cost is higher, so few of casein in milk production enterprises.