Study On Preparation Of Rice Protein From Rice Dregs And Its Industrial Design

Rice protein is recognized the high quality frumentaceous protein, which has some characters, such as reasonable amino acid compositions, low hypoallergenic character. It's very suitable for infants and babies and other special crowds as nutritious food. Most people at home and abroad have attached importance to the rice protein research and development of product. This paper mainly studied on the preparation of rice protein from rice dregs, a buy-product of sugar as raw materials. The industial design was preliminary discussed.The effect of liquefaction treatment on dregs at high temperature on protein components and extraction ratio was investigated. Results demonstrated that liquefying at high temperature leaded to the loss of albumins, globulins and the increase of insoluble protein, the sharply decrease of protein extraction ratio among various pH values.Three methods, namely, alkaline extraction, protease extraction, and removal of impurity, were used to prepare rice protein and primarily contrasted. The results were as follows: The first method, which gave the low protein yield and poor solubility product, was no longer suitable for protein extraction.The types of protease affected protein extraction ratio greatly in enzyme extraction. The neutral protease enzyme was ideal for production, if protein yield and quality of sense were all considered. The excellent solubility of the rice protein product showed that protease could also modify the property of protein. But the purity of the product was low. For the method of removal of impurity,α-amylase had the best effect on removing impurity. The purity and extraction ratio of the rice protein product was very high, but the solubility of it was poor.Eligible protein could be prepared if the removal of impurity method combined with enzyme extraction. The whole preparation technology line of rice protein included: removing impurity to prepare rice dreg concentrates from rice dregs (defatting using hexane, removing sugar by water washing); Rice protein were hydrolyzed by protease (the optimal conditions: pH 7.8, 0.4%(E:S), 10 h, liquid to solid ratio 7:1); Decolorizing using active carbon (best conditions: active carbon content 3%, reaction time 35min); Spay drying. Under the above conditions, the whole recovery ratio and content of protein was 62.66%, 86.4%. The color of it was milkiness and the solubility was also excellent.The above experimental production was analyzed summarily. The results showed that the process was simple, fewer waste emissions, and economical. Based on this, some problems about industrial design were discussed. Firstly, the material equation about rice dregs was calculated. Secondly, some things about economy and profit were simply analyzed. Finally, a brief flow chart was designed. It shows that it would achieve a large-scale industrial production.