Method of extracting fish oil from squid skin

A technology for fish oil and cod, which is applied in the directions of fat oil/fat production and fat production, can solve problems such as high cost and low yield, and achieve the effects of high cost, low yield and high economic benefit.

Inactive Publication Date: 2018-09-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for extracting fish oil from cod skin, which mainly solves the technical problems of low yield and high cost in traditional methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After crushing and drying 10 g of fish skin, move them all into the filter paper tube, put the filter paper tube into the extraction tube of the Soxhlet extractor, connect the receiving bottle that has been dried to constant weight, and add petroleum ether from the upper end of the condenser tube of the extractor To two-thirds of the volume of the bottle, heated in a water bath to continuously reflux the extraction solvent for 12 h. Remove the receiving bottle, recover petroleum ether, evaporate to dryness on a water bath when about 2 mL of solvent remains in the receiving bottle, dry at 100°C for 2 h, cool in a desiccator for 0.5 h, and weigh. Fish oil production is 0.64%. The relative content of oleic acid in fish oil is 29.88%, the content of EPA is 2.899%, and the content of DHA is 3.76%.

Embodiment 2

[0017] After crushing and drying 10 g of fish skin, put them all into the filter paper tube, put the filter paper tube into the extraction tube of the Soxhlet extractor, connect the receiving bottle that has been dried to constant weight, and add ether from the upper end of the condenser tube of the extractor to Two-thirds of the volume of the bottle was heated in a water bath to continuously reflux the extraction solvent for 12 h. Remove the receiving bottle, recover ether, evaporate to dryness on a water bath when about 2 mL of solvent remains in the receiving bottle, then dry at 100°C for 2 h, cool in a desiccator for 0.5 h, and weigh. Fish oil production is 1.21%. The relative content of oleic acid in fish oil is 18.38%, the content of EPA is 3.52%, and the content of DHA is 4.48%.

Embodiment 3

[0019] After crushing and drying 10 g of fish skin, move them all into the filter paper cylinder, put the filter paper cylinder into the extraction cylinder of the Soxhlet extractor, connect the receiving bottle that has been dried to constant weight, and add ethyl formate from the upper end of the condenser tube of the extractor. The ester was filled to two-thirds of the volume of the bottle, heated in a water bath to continuously reflux the extraction solvent for 12 h. Remove the receiving bottle, recover ethyl formate, evaporate to dryness on a water bath when about 2 mL of solvent remains in the receiving bottle, dry at 100°C for 2 h, cool in a desiccator for 0.5 h, and weigh. Fish oil yield is 0.95%. The relative content of oleic acid in fish oil is 21.82%, the content of EPA is 6.36%, and the content of DHA is 7.98%.

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Abstract

The invention relates to a method of extracting fish oil from squid skin. The method comprises extracting and separating fish oil from squid skin through extraction solvents such as an ether, an esteror an alkane, and evaporating the extraction solvents through rotary evaporation so that the extraction solvents are successfully separated from the fish oil and the fish oil product is obtained. Themethod can extract fish oil from fish skin wastes and retain the nutrients such as oleic acid, DHA and EPA. The method changes the fish skin into valuables, has simple and easy processes and utilizesrenewable extraction solvents.

Description

technical field [0001] The invention belongs to the field of fish oil extraction and relates to a method for extracting fish oil from cod skin. Background technique [0002] Fish skin is rich in fish oil. As a nutrient, fish oil contains unsaturated fatty acids such as oleic acid, EPA, and DHA, accounting for about 2.78% of the weight of fish skin. Fish skin is a kind of waste, if the fish oil in the fish skin can be extracted, so that resources can be recycled, it will be of great significance. [0003] In terms of patented inventions, Tao Ningping et al. (CN104194911A) invented and disclosed a method for refining tilapia oil. The head of tilapia processing waste is used as raw material, and after being chopped, it is hydrolyzed by compound protease under certain conditions. , and then undergo centrifugation to obtain crude fish oil, and decolorize the crude fish oil under certain conditions to obtain refined fish oil. In the present invention, the yield of crude fish oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/00C11B1/10
CPCC11B1/02C11B1/10
Inventor 魏琦峰徐露任秀莲
Owner HARBIN INST OF TECH AT WEIHAI
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