The technology of extracting lecithin from the leftovers of leather beard catfish

Abstract

The invention discloses a technology for extraction of phosphatidylcholine from clarias gariepinus leftover. The technology comprises 1, mincing and triturating head and internal organs of clarias gariepinus at a temperature less than 50 DEG C, 2, adding an acetic acid-sodium acetate buffer solution into the triturated materials obtained by the step 1 to adjust pH as protease enzymolysis pH, heating the material to a temperature of 37-45 DEG C, adding 0.015-0.075% of protease into the materials and carrying out enzymolysis for 60-100min, 3, adding extract into the enzymolysis product obtained by the step 2, carrying out stirring, carrying out extraction at a temperature of 35-45 DEG C for 60-100min and carrying out pressure reduction pumping filtration to obtain extract and 4, adding NaCl into the extract obtained by the step 3, carrying out stirring dissolution, carrying out standing for 3-4h to obtain precipitates and carrying out drying at a temperature less than 50 DEG C. The technology utilizes fish leftover, realizes waste recycle, prevents competition with human and animals in nutrition resources, reduces environmental pollution and has important ecological and economic meaning.

Description

technical field [0001] The invention relates to the technical field of lecithin, in particular to a process for extracting lecithin from leftovers of catfish. Background technique [0002] Lecithin, broadly referred to as lecithin, refers to the common name for various commercially available organophosphate products. Its main components are phosphatidylcholine (PC), phosphatidylcholine (PE), phosphatidic acid and phosphoinositide (PI). In the narrow sense, lecithin refers to phosphatidylcholine, which is phosphati-dycholine in English, which is a phospholipid-containing substance composed of glycerol choline phosphoric acid saturated and unsaturated fatty acids. [0003] At present, lecithin products are mainly extracted from plant hydration oils such as soybean oil and rapeseed oil, or animal brains and egg yolks, especially egg yolks, which have the highest content, but the cost of extracting lecithin from egg yolks is relatively high. According to literature reports, le...

AI Technical Summary

Problems solved by technology

[0012] (1) Disadvantages of raw materials: At present, lecithin at home and abroad is mainly extracted from oil crops such as soybeans, egg yolk and other poultry eggs, and it competes with humans for food resources in terms of raw materials;

[0013] (2) Many extraction solvents are toxic: In the extraction process, organic solvents such as acetone, chloroform, n-hexane, ether, acetonitrile, etc. are often used in the industry for extraction, which will cause certain organic solvent residues in the product and high toxicity. This problem has always been not well resolved;

[0014] (3) Inorganic salt as a precipitant: more research is to use ZnCl 2 and CdCl 2 , both of which have certain toxicity, and this problem has not been improved

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