What are the compositions in soy protein isolate?
Abstract: As everyone knows, soybeans (soybeans, black beans) have attracted much attention in recent years because of their extremely high nutritional value and excellent health functions, and they have shined in the food industry. Soybean contains a lot of stored protein, its content can be as high as 40%.
Keywords: soy protein isolate, nutrition, elements, food
Soy protein only exists as a dispersed phase in a continuous phase composed of synthetic polymers (PVA), and there is still a considerable gap from the true meaning of all-natural soybean protein fibers. Therefore, it is still very important and necessary to conduct a comprehensive basic research on the relationship between the structure and performance of soybean protein. Soy protein isolate is an important component of soybeans. It is a mixture with a protein content of not less than 90% after removing soybean oil and water-soluble non-protein components from soybean meal at low temperature. Its composition, structure and properties basically represent pure soybean protein.
The main constituent elements of soy protein isolate are C, H, O, N, S, and P. It also contains a small amount of Zn, Mg, Fe and Cu. Its amino acid composition mainly includes glycine, aspartic acid, glutamic acid, and lysine. Acid and tryptophan, etc. According to different centrifugal separation coefficients (ie sedimentation coefficients), soy protein isolate can be divided into 4 components, 2S, 7S, 11S and 15S. The composition and content of each component of soy protein isolate are shown in Table 1. Among them, the 7S component accounts for 35%, the 11S component accounts for 52%, and the B-conglycinin and 11S components in the 7S component Glycinin is the main component of soy protein isolate.
Who is suitable for soy protein isolate?
Compared with animal single protein, an obvious advantage of soy protein isolate is that it has lower fat and no cholesterol. This feature makes it have a good absorption rate, which is very suitable for people with weak health, the elderly and babies. is allowed.
In recent years, the use of soy protein isolate as a base material to replace whey powder as a product for infant formula powder has also continued to introduce new trends. In addition to nutrition, lactose-free and hypoallergenic are also important reasons why it is favored by manufacturers.
Because soy protein isolate does not contain lactose, it is edible for infants with galactosemia or lack of lactase; at the same time, lactose-free formula can also help infants recover from diarrhea caused by transient lactase deficiency. In terms of allergenicity, infants fed soy protein-based formula milk powder have very, very low allergic reactions, while those fed milk-based formula milk powder are relatively high. This also shows that soy protein isolate is more reliable in eating.
What are the precautions for the consumption of soy protein isolate
Soy protein powder is rich in nutrients and convenient to eat. With the improvement of people’s health awareness. Soy protein powder has become a kind of food that everyone loves very much. So what matters should be paid attention to when eating soy protein powder?
- Pay attention to the water temperature.
Eat warm or cold, not hot or hot. The protein powder containing whey protein contains many active substances with special physiological functions. They are all afraid of heat. Once heated, they will lose their activity, thus greatly reducing the biological potency. Therefore, protein powders containing whey protein must not be boiled or scalded. They can only be dissolved (mixed) in foods such as water, porridge, and malted milk below 40°C. They can also be eaten as cold drinks.
- Eat according to the recommended intake.
Since the raw materials and processes used by various manufacturers are not exactly the same, their label instructions have their respective recommended amounts, and consumers should not increase or decrease the amount arbitrarily. Eating too little can not achieve the intended purpose; eating too much can cause waste or side effects.
- Do not take it on an empty stomach.
Eating protein powder on an empty stomach, protein powder will be consumed as a general “thermogenic food”, wasting precious protein. Therefore, protein powder is suitable for eating after or during meals. Patients who can only eat liquid food can add protein powder to milk, soy milk, oatmeal, malted milk extract and other foods.
- Some people who drink protein powder will have diarrhea, indigestion, bloating, stomach gurgling and other symptoms. This is because these people lack lactase and are intolerant to lactose. They are prone to diarrhea when drinking protein powder on an empty stomach (the reason is the same as drinking milk, The situation of dairy products such as yogurt is similar). In addition, do not eat too much protein powder, the above symptoms will also occur in indigestion, you can take it several times a day.