baby milk powder protein dispute and “mercury over standard” event, let people familiar with a term: whey protein. In fact, whey protein is often sold as health care products, such as the popular “muscle powder” among fitness enthusiasts. If the waste water in the food industry is called “gutter water”, then the protein extracted from whey may be called “gutter protein”. However, the development of industrial technology has already turned whey liquid into treasure, and whey protein has become a star in edible protein. The main solid components of

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milk are protein, fat and lactose. In the west, one of the main destinations of milk is to make cheese. With the help of chymosin and other substances, caseins in milk gather together to form a solid and “separate” from the milk. Most of the fat is wrapped in casein, which together becomes a solid. These solids are cheese. After

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take away the cheese, the milk becomes “whey”. The water solubility of lactose is very good, basically left behind, the content of lactose in whey can account for about 5%. Most of the protein and fat turned into cheese, leaving less than 0.5% fat and less than 1% protein. In addition, there are some mineral components. Traditionally, these things do not attract much interest, and the whey is often drained directly into the gutter. The food industry of

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is always advancing in the process of transforming waste into treasure. Although the protein in whey is less than 1%, but only 3% in milk. It is a pity that these proteins are discharged into the ditch. However, it is not easy to separate less than 1% of the protein from water and remove other ingredients such as lactose. The

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peak turn is due to the application of ion exchange and membrane separation technology. Proteins can be positively charged in highly acidic environments and negatively charged in highly alkaline environments. The ion exchange resin is a charged medium. According to the principle of “same-sex repels each other, while the opposite attracts each other”, by changing the pH value of whey liquid, the protein in it can be adsorbed on the resin first, and then change the pH value and then “elute” them to obtain whey protein with high purity. The whey protein powder was obtained by drying the purified whey protein. Membrane separation technology is to take advantage of the difference in molecular size between different components. First, a microfiltration membrane with a large “membrane pore” is used to intercept impurities larger than protein molecules, and then a microfiltration membrane with a small “membrane pore” is used to block the protein. Lactose and minerals are small molecules that can be removed through microfiltration membranes. The solubility of

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proteins in water is closely related to pH. Basically, all kinds of edible protein will accumulate and precipitate in acidic environment. Whey protein is a heresy. It can stay in water safely at any pH. Adding protein into beverages is a direction to increase the nutritional value of beverages. However, many beverages are acidic and most proteins cannot be dissolved. As a result, whey protein has been widely used in acidic protein drinks. In order to develop new protein for use in acid drinks, it is necessary to imitate or surpass it. The reason why

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whey proteins are popular is not only the excellent solubility characteristics, but also the excellent “protein quality”. Measured by the most commonly used “digestion corrected amino acid score”, only chicken protein, milk protein (casein and whey protein) and isolated soybean protein got a full score of 1.0. Other chicken, pork and beef are slightly inferior. In addition, due to the high acidity in the stomach, the general protein will agglutinate down, and the mixture with the digestive juice is not so sufficient, so it will affect the digestion speed. Whey protein is not affected, and the speed of digestion and absorption is faster than other proteins. This is no problem for adults, but the baby’s digestive system is not perfect, so it is important to reduce the digestive burden. Therefore, infant formula needs to increase the proportion of whey protein and reduce the proportion of casein.

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have three kinds of amino acids called “branched chain amino acids”, which are up to 35% in muscle protein. More branched chain amino acids are required in the process of synthesizing muscle protein (or, more commonly, muscle growing). In addition, after high-intensity exercise, especially after fitness exercise, muscle tissue is in a state of hyperactivity (also a state of “injury”). If a large number of branched chain amino acids are supplied at this time, it will help protein synthesis and recover from the “damaged state” more quickly. Whey protein contains a large number of branched chain amino acids, and they can be quickly digested and absorbed, reaching the muscle tissue. This is whey protein as a “muscle powder” theoretical basis. This theory is supported by some experimental data, but it is not very solid. Fortunately, whey protein itself is a kind of food, even if “ineffective” will not have any harm. As a health product, “maybe useful, at least harmless”, for the fitness enthusiasts who do not need money, it has enough appeal. As food, whey protein is a good protein. But for most people, eating protein is just to meet the needs of amino acids, whey protein’s “special” is not very important. It is not a cost-effective thing to consume expensive high-purity protein powder. A variety of foods and plenty of protein will do. Kdspe and

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