Method for producing germ oil, oligosaccharides and protein concentrate by using soybean germs

Abstract

The invention discloses a method for producing products such as soybean germ oil, soybean germ protein concentrate, soybean oligosaccharides, soybean saponins and soybean isoflavones by using soybean germs, and relates to the field of deep grain processing. The method comprises the following steps of: performing online stabilization treatment on the soybean germs; performing normal temperature extraction and low temperature desolventizing by taking subcritical fluid as a lytic enzyme to produce the soybean germ oil; extracting polar ingredients such as the soybean oligosaccharides and the like from the defatted soybean germs by taking subcritical liquid ammonia and the like as lytic enzymes, and separating the oligosaccharides, the isoflavones and the saponins from the extract and purifying; and separating the soybean germ protein concentrate from the liquid ammonia extract, namely a low temperature soybean gear meal. When the method is used, five products such as the germ oil, the oligosaccharides, the soybean protein concentrate and the like can be obtained simultaneously, so that the full utilization of the soybean germs is realized, and production cost is low; reextraction can be completed in different extraction stages of the same leaching equipment, so that investment is saved; and zero emission is realized, so that the method is environmentally-friendly.

Description

technical field [0001] The invention relates to the field of fine and deep processing of grains, in particular to a method of using soybean germ as raw material, subcritical fluid step-by-step extraction, co-production of soybean germ oil, soybean oligosaccharides, soybean germ concentrated protein, soybean saponin and soybean isoflavones . Background technique [0002] Soybean germ is the basis for the growth and development of soybean seeds. It has special ingredients and nutritional value. Although its mass only accounts for 2.0-2.5% of the total weight of soybeans, it is rich in isoflavones, saponins, oligosaccharides, V E and phytosterols and other physiologically active substances. According to the literature, the contents of various nutrients in soybean germ are shown in Table 1. [0003] Table 1 Nutritional composition of soybean germ [0004] Element moisture crude fat crude protein crude fiber Ash Oligosaccharides Total glycosides Isofla...

AI Technical Summary

Problems solved by technology

The inventor did not explain the quality of the defatted soybean germ meal. If the meal is dried at high temperature, the quality of the final product - soybean protein concentrate will be poor and the yield will be low. The method does not involve the utilization of soybean germ oil

In addition, this method requires high temperature treatment above 100°C when removing the ethanol solvent in the meal, resulting in protein denaturation

Although this patent relies on enzymatic hydrolysis and spray drying to make the NSI of the product ≥ 80%, the production cost of soybean germ protein will be very high

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