Extraction and refining process of euphausia superba oil

Abstract

The invention discloses an euphausia superba oil extracting and refining process, which comprises the following steps: degumming, deacidifying and deodorizing crude euphausia superba oil after leaching by adding absolute ethyl alcohol, centrifuging, filtering and desolventizing to obtain refined euphausia superba oil, wherein the degumming adopts a phosphoric acid hydration method and comprises: adding phosphoric acid and double distilled water into the crude euphausia superba oil, carrying out a reaction, and carrying out centrifugal layering to obtain upper-layer degummed euphausia superba oil, and the deacidifying comprises: neutralizing the free fatty acid in the degummed euphausia superba oil by adding a sodium hydroxide solution to generate a sodium aliphatate salt, carrying out coagulation sedimentation, and adding double distilled water to wash away the residual soapstock in the euphausia superba oil so as to obtain upper-layer deacidified euphausia superba oil.

Description

technical field [0001] The invention belongs to the technical field of extraction of Antarctic krill oil, and in particular relates to an extraction and refining process of Antarctic krill oil. Background technique [0002] The development and utilization of Antarctic krill resources has become an important carrier for the development of my country's marine strategic emerging industries, especially the resource development of Antarctic krill oil. The polyunsaturated fatty acids EPA and DHA in Antarctic krill oil mainly exist in the form of phospholipids. Compared with EPA and DHA in the form of triglycerides or fatty acid ethyl esters in fish oil, it has higher bioavailability and is easier to be absorbed by the human body. The development of nerves and optic nerves plays an important role; EPA can promote the metabolism of saturated fatty acids, reduce the content of cholesterol and triglycerides, and effectively prevent cardiovascular diseases such as cerebral thrombosis, ce...

AI Technical Summary

Problems solved by technology

[0003] At present, the extraction method of Antarctic krill oil is mainly based on organic solvent extraction, and it is only a simple preliminary extraction. The Antarctic krill oil obtained by it is of low quality, high in impurities, poor in color, and has a shrimp smell taste, which limits the further development and utilization of Antarctic krill oil

The Chinese patent with the application number 201811116201.2 discloses a preparation method of Antarctic krill oil, deodorized Antarctic krill oil and its application, food, and specifically discloses the use of absolute ethanol to roughly extract and separate Antarctic krill powder, and then Then use absolute ethanol to repeatedly redissolve and concentrate the crude shrimp oil under strong mixing. Finally, the refined shrimp oil is vacuum deodorized to obtain Antarctic krill oil without fishy smell. However, in the refining process in this patent, only A solvent is used to integrate crude extraction, refining and phospholipid enrichment. During the refining process, other treatments except deodorization cannot be achieved. Antarctic krill is rich in free fatty acids, resulting in high acid value and high acid value of Antarctic krill oil. Due to the current acid value standard of edible oil and fish oil in the country, the deacidification process is necessary for safe Antarctic krill oil products

The oil refining process commonly used in industry is a process of first degumming and then deacidification. First, the phospholipids in the oil are removed through the degumming process, and then the alkali refining method is used for deacidification. Otherwise, the phospholipids in the oil will It will absorb water and swell and affect the deacidification effect. However, Antarctic krill oil is rich in phospholipids and Antarctic krill phospholipids are rich in phospholipid-type polyunsaturated fatty acids. Phospholipid-type polyunsaturated fatty acids have higher bioavailability and better biological activity. Therefore, the alkali refining deacidification commonly used in industry is not suitable for the deacidification of Antarctic krill oil; the Chinese patent application number 201510240731.8 discloses a multi-stage countercurrent continuous leaching and refining method of Antarctic krill oil. As the extraction agent, the Antarctic krill oil is extracted by multi-stage countercurrent continuous leaching method. The mixed oil is filtered and centrifuged, and the upper liquid is desolvated by vacuum to obtain crude oil. The crude oil is dissolved in n-hexane again, and sodium silicate is added. After stirring The mixed oil is filtered and centrifuged, and the upper layer liquid is taken, and the layer is placed at -4°C to 4°C. After the upper layer liquid is vacuum desolvated, the refined shrimp oil of Antarctic krill is obtained. The patent uses countercurrent continuous leaching for 2 to 5 Grade, Antarctic krill oil with low acid value and insoluble impurities can be obtained, but there is no degumming process for removing peptized impurities in this patent