First, the use of soy protein concentrate Soy protein concentrate, also known as 70% protein powder. Soy protein concentrate can be used in the production of milk replacer powder, protein castables, minced meat, latex minced meat, roulades, seasonings, baked goods, baby food, and simulated meat. It should be selected according to the functional properties of different protein concentrates. Second, the processing method in the processing of soy protein concentrates, the raw material is better at low temperature dehydration, can also be used high-temperature leaching helium, but the utilization rate is low, the quality is poor. The methods for producing protein concentrates include dilute acid precipitation and alcohol washing. 1. Dilute acid precipitation method uses the principle of the lowest protein solubility in the isoelectric point (pH 4.3-4.5) state of lecithin powder leachate. Centrifugation is used to separate insoluble protein and polysaccharide from soluble carbohydrate and low molecular weight protein, and then neutralized and concentrated. And dry dehydration, that is concentrated protein powder. This method can remove the smell of soybeans at the same time. Dilute acid precipitation method produces concentrated protein powder, which has good water solubility (high PDI value), but has a large acid-base consumption. Simultaneously discharging a large amount of sugary wastewater causes post-processing difficulties, and the flavor of the product is not as good as the alcohol method. 2. The alcohol washing method utilizes the principle that the solubility of soluble protein is the lowest when the alcohol concentration is 60% to 65%, and the alcohol solution is mixed with the low-temperature desolventizing mash to wash the soluble sugar, ash and alcohol soluble protein in the mash. The alcohol solution is separated by filtration, and alcohol and sugar are recovered. The slurry is dried to concentrate the protein powder. The protein powder produced by this method has better color and flavor and less protein loss. However, due to protein denaturation and the product still contains 0.25% to 1% of alcohol, the value of food is limited. In addition there are wet hot water washing, acid-leaching alcohol washing and membrane separation methods. In the membrane separation method, ultrafiltration membranes are used for desugarization to obtain concentrated proteins, reverse osmosis membranes are dehydrated to recover water-soluble low-molecular-weight proteins and sugars, wastewater treatment projects are not required in production, and the product has a high nitrogen solubility index (NS), and thus is a kind of There are promising ways.
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