Method for squeezing and extracting wheat-germ oil at low temperature

Abstract

The invention discloses a method for squeezing and extracting wheat-germ oil at a low temperature, which comprises the following steps of: removing flour and bran from fresh wheat germs with a sorting machine until the purity of the wheat germs reaches 99 percent; softening and sterilizing the wheat germs; adding the wheat germs into an oil press to automatically squeeze oil; washing with water, namely adding the crude oil after being filtered into an oil refining kettle, indirectly heating the oil to 75 DEG C, starting to stir at a rotation speed of 20 to 40rpm, adding 5 percent hot water of which the temperature is 85 DEG C through a sprayer, stopping stirring 5 minutes later, and after standing the oil for 2 hours, discharging water and the precipitate; drying under vacuum, namely drying under vacuum when the temperature of the oil reaches 75 DEG C so as to reduce the water content to 0.05 percent; and performing refining filtration, namely, performing cold water circulation on the germ oil to reduce the temperature to 30 DEG C, and filtering the germ oil with a 400-mesh sieve to remove suspended matters and impurities. The method has the advantages of obtaining natural full-cream wheat-germ oil, along with low cost, low requirements on production, simple process, massive popularization, low nutrition ingredient loss and no chemical solvent residue.

Description

technical field [0001] This patent relates to a low-temperature pressing extraction method of wheat germ oil. Background technique [0002] Wheat germ oil is a high-nutrition health product recognized by the world, known as "liquid gold" and "longevity vitamin treasure house". Among them, the content of oleic acid, linoleic acid and linolenic acid is as high as more than 80%, and the natural vitamin E is the first among all kinds of oils. It has anti-oxidation, anti-aging, prevention of three highs, and enhances human immunity. Wheat germ is known as "the natural nutrition bank of the human body". It is rich in protein, comprehensively balanced in amino acids, and easy to absorb by the human body. It is a good source of high-quality full-price protein nutrition. [0003] Existing wheat germ oil extraction methods can be divided into: leaching method, supercritical CO 2 Extraction, enzymatic hydrolysis. There are chemical solvent residues in the leaching method; supercriti...

AI Technical Summary

Problems solved by technology

There are chemical solvent residues in the leaching method; supercritical CO 2 The extraction method has a large investment cost and requires high production conditions; the enzymatic hydrolysis method is complicated and difficult to promote on a large scale

And above several methods all can not obtain pure natural full-fat wheat germ oil, and the loss of nutritional labeling is big; Wheat germ after defatting can only be used as feed raw material

Images