A kind of extraction method of linseed oil

Abstract

The invention relates to an extraction method of flaxseed oil. The extraction method comprises the following steps: adopting a mixed solvent of alkaline ethanol and sub-critical propane as an extraction medium; carrying out extracting under the conditions that the temperature is 35 to 60 DEG C and the pressure is 0.3 to 0.8Mpa; after extraction, separating the raw materials from an extracting solution; removing the solvent by using the extracting solution to obtain the flaxseed oil. The temperature of the whole operation process is smaller than or equal to 60 DEG C, and better facilitates the stabilization of functional components such as the flaxseed oil and lignan; in addition, degreased flaxseed meal has no change in color or property, and secondary depth development of flaxseed gum extraction and the like can be realized; according to a method for extracting the flaxseed oil by adopting the mixed solvent of the ethanol and the sub-critical propane as the extraction medium, functional flaxseed oil with high contents of the lignan and linolenic acid is obtained at one step and is higher in added value; the extraction method is simple and quick in operation process, low in energy consumption and high in extraction efficiency, and facilitates comprehensive utilization and high added value processing of the raw materials.

Description

technical field [0001] The invention relates to a method for preparing vegetable oil, in particular to a method for extracting linseed oil. Background technique [0002] Flax (Linum usitatissimum L), also known as flax, is one of the oldest crops. There are three varieties for oil, fiber, and dual-purpose oil and fiber. The seeds can be used for oil extraction. Linseed has become the seventh largest oil crop in the world and the fourth largest oil crop in my country. In recent decades, the bioactive components in flaxseed have been gradually discovered and recognized by researchers. The first is flaxseed oil, which contains 14-18% linoleic acid and as high as 45-52% linolenic acid. Prevention of disease is of great help. As a great source of omega-3 polyunsaturated fatty acids, flaxseed oil has become an important alternative to fish oil. The rich soluble dietary fiber in flaxseed—flaxseed gum has also attracted the attention of researchers. It is mainly composed of polys...

AI Technical Summary

Problems solved by technology

[0003] At present, the processing of linseed is mainly based on the extraction of oil, and most of them use the traditional vegetable oil extraction process of pressing and leaching. The heat process involved is extremely unfavorable to the stability of linseed oil rich in linolenic acid, while linseed oil extraction The final cake is used as feed, without further processing, and the utilization rate is not high

[0004] The extraction and purification research of flax lignans is constantly being carried out. The traditional organic solvent extraction is the main method. The solvents used are mainly methanol, ethanol, acetone, etc. The techniques used include microwave-assisted extraction, ultrasonic-assisted extraction, supercritical extraction, Accelerated solvent extraction, etc., but consumes a lot of solvent, takes a long time, and the extraction efficiency is also low

There is an attempt to extract lignans from defatted linseed powder with subcritical water. This accelerated solvent extraction method avoids the use of organic solvents, and the yield is satisfactory, but the method requires high equipment investment and operating conditions. Not yet suitable for industrial applications (Journal of FoodEngineering, 2006, 77: 1087-1095)