Method for extracting whole wheat-germ oil

Abstract

The present invention relates to an extraction method of full-fat wheat-germ oil. Said extraction method includes the following steps: (1), heat treatment of wheat germ; (2), enzymolysis; (3), enzymatic inactivation; (4), vacuum drying; and (5), cold-pressing so as to obtain the invented wheat-germ oil.

Description

Technical field: [0001] The invention relates to a method for extracting wheat germ oil. Background technique: [0002] my country has a large amount of wheat production. Wheat germ is a by-product of wheat flour milling. The available reserves of wheat germ are 2.8-4.2 million tons per year, but most of them are concentrated in the manufacture of primary products, and are often mixed into bran as feed , resulting in a waste of resources, so it is of great significance to fully develop wheat germ resources and conduct research on the extraction process of wheat germ oil. [0003] Wheat germ contains a variety of nutrients that are beneficial to the human body, including unsaturated fatty acids, vitamin E, phospholipids, phytosterols, octacosanol, oryzanol and trace elements, among which the content of vitamin E is as high as 140-400mg / 100g Known as the "Crown of Vegetable Oils". The oil content of wheat germ is 12%. At present, the extraction of wheat germ oil mainly adopt...

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Problems solved by technology

But all there are some defects in these methods: (1) the residual oil of oil cake that high-temperature pressing method goes out is high, because the temperature of pressing process is high, the color and luster of wheat germ oil is deep, easy to oxidize, and protein nutrition in the wheat germ is destroyed; (2) leaching The solvent used in the method is a flammable and explosive chemical reagent, which has certain toxicity, and there will be residues of chemical solvents in the product. The wheat germ oil extracted by the above two methods needs to be refined before the wheat germ oil capsule can be prepared. During the refining process, wheat germ oil has to be in direct contact with lye, bleaching clay, phosphoric acid, etc., so it does not have the characteristics of natural and green products. At the same time, due to the high temperature treatment required in the processing process, some trans fatty acids, thermopolymers, oxidation Harmful substances such as by-products; (3) supercritical CO 2 The equipment for extracting wheat germ oil is expensive, the requirements are high, and it is difficult to promote it on a large scale in the industry. Due to the selectivity of supercritical extraction, the phospholipid content in wheat germ oil is relatively low, so the wheat germ oil extracted by the above three methods is not full fat. Wheat germ oil