Milk permeate

Milk permeate, a byproduct of milk processing, has emerged as a valuable ingredient with numerous benefits for the food industry. Comprising water, lactose, minerals, and vitamins, milk permeate serves as a versatile and cost-effective enhancer in various food products.

Milk permeate is a byproduct of milk processing that consists of the liquid portion of milk minus the proteins and fats. When milk is processed to produce products like cheese or butter, the proteins and fats are often separated from the liquid through various methods such as ultrafiltration or centrifugation. The remaining liquid, which contains lactose, minerals, and water-soluble vitamins, is known as permeate.

The simplicity of this process not only makes milk permeate a convenient ingredient for manufacturers but also ensures its cost-effectiveness, making it an attractive option for a wide range of food applications.

In food production, milk permeate plays a crucial role in enhancing flavor and texture, contributing to the overall quality of diverse products. Its inclusion also boosts the nutritional content, making it a valuable resource for creating healthier options. Whether incorporated into baked goods, beverages, or dairy products, milk permeate adds depth and richness to the final product.

Moreover, the use of milk permeate aligns with sustainability goals in the dairy industry. By repurposing a byproduct that would otherwise be considered waste, the industry minimizes environmental impact and reduces overall waste. This reflects a responsible approach to resource utilization, addressing concerns about sustainability and environmental stewardship.

In conclusion, milk permeate stands as a remarkable byproduct with significant benefits for the food industry. Its enhancement of flavor, texture, and nutritional content, coupled with a straightforward and cost-effective processing method, positions it as an invaluable ingredient. Additionally, its use contributes to sustainability efforts, making milk permeate a win-win solution for both manufacturers and the environment.
Milk permeate

Cheesemaking: aging process

In its final stage of production, cheese is set out in a controlled environment to age The cheese is stored in a place of proper temperature and humidity for aging also known as ripening. Some cheeses are aged for a month and some are aged for several years. The length of the aging period in the plant was determined by expert elicitation.

Cheesemakers manage its temperature, humidity, and bacteria population. During the aging process, the starter bacteria again become active as they break the casein protein and milkfat into fatty acids, amines, and amino acids.

The degree of protein decomposition significantly affects the quality (consistency and taste) of the cheese. It is during this process that Swiss cheese gains its signature holey appearance, as its bacteria produce carbon dioxide gas bubbles.

Biochemical changes in cheese during aging may be grouped into primary (lipolysis, proteolysis and metabolism of residual lactose and of lactate and citrate) or secondary (metabolism of fatty acids and of amino acids) events. Residual lactose is metabolized rapidly to lactate during the early stages of aging.

Additional bacteria are often introduced (either applied directly to the cheese or made present in the air) to further manipulate the cheeseʼs final taste and consistency.
Cheesemaking: aging process

Butter

Butter is a saturated animal fat obtained from milk and cream. It is the fat from pasteurized cream and milk that has been solidified by churning.

Butter contains 81 percent fat, 16 percent to 18 percent water and other ingredients such as casein, lactose and salt.

Butter is made by churning pasteurized cream using batch process (35 to 45 percent fat cream) or continuous (42 to 44 percent fat cream) churns.

The yellow color of butter is due to beta-carotene which comes from the plants eaten by the cow.

Light butters are made from butter and water and have half the fat and cholesterol of regular butter. These products are fine for toast and vegetables, but can’t be used in cooking.

Sweet cream butter and sweet butter are made from pasteurized sweet cream to which no starter has been added.  Ripened cream butter is made using starter-ripened cream, or cream that has a bacterial cultures added to start fermentation.

Butter is graded by the US Department of Agriculture (USDAO according to its flavor, butterfat content, purity and keeping quality, among other characteristics. Grading is done on a point system with 100 being the best. Grade AA must have at least at 93 points. Grade A at least 92 and Grade B a minimum 0f 90 points.

Average annual consumption is about four pounds for each American, about a third as much as margarine, and is used in sautéing, frying and baking.
Butter

Milk powder

Production of dried milk products can be traced back to ancient times when milk was dried in the sun.

Since commercial available in the late 1800’s, the milk powder production industry has grown significantly, with production of both whole milk powder and skim milk powder.

Milk powder manufacture in its simplest form involves solids concentration of liquid milk usually through evaporation followed by drying and packaging.

The production for whole milk powder generally consists of two stages. In the first stage, milk is condensed to 45-50 percent solids under vacuum in a multieffect evaporator.

In the second stage, the milk are thermal evaporation, homogenization and dried using either spray or roller dryers, which removes all but 4-5 percent of the water content. The resulting powder is whole milk powder.

While, separation of whole milk into cream and skim milk and the subsequent evaporation and drying of the skim milk stream are the primary processing steps used for the manufacture of skim milk powder. Skim powder is also commonly referred to as non-fat dry milk.

Actually there is a variety of milk powders available in the market. Among the dried powder products available are full cream milk powder, skim milk powder, whey and whey protein concentrate powders, milk protein/caseinate powders, buttermilk powders and cream powders.

Milk powder

Process of Pasteurization

Process of Pasteurization
Pasteurization, named after Louis Pasteur (1622-1895), its originator, was originally used to treat wine and beer, but soon came into use to treat milk as well, when it found that heating milk for a short time to below its boiling point killed microorganisms.

Pasteurization destroys 100 percent of pathogenic bacteria, yeasts and molds and 95 to 99 percent of other, nonpathogenic bacteria.

The process of pasteurization also inactivated many of the enzymes that cause the off-flavors of rancidity.

In the United States pasteurization was championed by Alice Catherine Evans (1881-1975), a microbiologists who worked for the US department of Agriculture.

Evans suffered from a disease known as brucellosis (undulant fever) and in 1918 she discovered that brucella, the bacterium that caused her disease, could be found in cow’s milk.

Scientists eventually determined that brucella was not the only milk borne bacterium. Milk can harbor other bacteria – such as E. coli, salmonella, and listeria – which can cause harmful and even life threatening infectious in the young, the old, pregnant women and the infirm.

Indeed, unpasteurized cow’s milk was a very common cause of tuberculosis, typhoid fever and salmonellosis.

Evans advocated on behalf of pasteurization for years after her discovery. Finally in the 1930s, milk pasteurization became mandatory under US law.

The advantages to be derived from pasteurization vary with the conditions under which the milk is produced and the efficiency with which the work is conducted.

If the milk comes from dairies where disease and uncleanliness prevail, pasteurization will prolong the keeping quality of the milk and also materially lessen the danger from disease germs.

If on the other hand, healthfulness and cleanliness receive the exacting attention which prevails on certified dairy farms, nothing can be gained by subjected milk to the pasteurizing process.
Process of Pasteurization