Cake preparation method for protein

At present, rapeseed feed protein and industrial protein have entered the practical stage, while edible protein is still in the development stage. Domestic and foreign scholars have studied the technical process for extracting protein concentrates or separating proteins from rapeseed cakes. The glucosinolates in their products have been almost completely eliminated. The disadvantage is that phytic acid and tannin bind tightly to proteins, resulting in protein concentrates. The product contains higher amounts of phytic acid (5% to 10%) and phenolic substances (tannins, etc.), while the conversion rate of protein to concentrated protein is only 55% to 62%, and the rest is feed protein. This technology The development of shelling cakes has good prospects. For the development of shelled pancakes, there are many impurities, purification is difficult, the yield is low, the cost is high, and industrial production is difficult. Preparation of edible protein: The protein extraction rate was 91% at a temperature of 40° C., a pH of 10, a material-liquid ratio of 1:30, a time of 20 minutes, and 5% NaCl. The comprehensive cost analysis shows that it is feasible to prepare edible protein concentrates or protein isolates using unhulled and invariable rapeseed meal as raw material, and the cost of the prepared protein is low and the protein recovery rate is high. The amino acid balance is better than that of soy protein. The nitrogen solubility index of the isolated protein in rapeseed is lower than that of soybean protein isolate. The oil absorption is slightly better than that of soybean protein isolate, and the emulsification is better than the soy protein isolate. The lysine content of the isolated protein is much lower than that of the rapeseed cake after low-temperature degreasing in the laboratory. This is due to the protein denaturation caused by the high-temperature oil extraction of the commercially produced rapeseed cake, which also indicates the current pre- The extraction and extraction process has great defects.

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