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A method for enriching fish oil epa and dha by low-temperature crystallization

A low-temperature crystallization, fish oil technology, applied in the direction of fat oil/fat refining, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of difficult to find relevant condition parameters, cumbersome separation and purification process, high equipment requirements, and easy operation. , good separation effect, large single processing effect

Active Publication Date: 2020-08-25
FUNCTION (QINGDAO) MARINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation and purification process of molecular distillation technology is relatively cumbersome, such as the need for multi-stage purification, how to achieve continuous feeding, the impact of solid feed on material degradation when heated at high temperature, etc.
Supercritical extraction technology has the characteristics of low temperature, high pressure, and air isolation. It is especially suitable for the separation of heat-sensitive substances and easily oxidized substances. It can fully protect the quality of fish oil from damage, and the product quality is good, but this method requires high equipment. , high energy consumption,
[0006] However, there is no report on the specific process research on the enrichment of fish oil EPA / DHA by low-temperature crystallization method, and it is even more difficult to find relevant condition parameters as a reference. Therefore, exploring more enrichment methods and seeking more possibilities is essential for the future upgrade of the fish oil industry. reform is very important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The method for enriching fish oil EPA and DHA through low-temperature crystallization of the present invention comprises the following steps:

[0036] Ethyl-esterified fish oil was heated at 30°C for 30 minutes, and the mass percent content of EPA and DHA in the ethyl-esterified fish oil was 50%;

[0037] Add methanol and diatomaceous earth to fish oil, the mass ratio of fish oil, methanol and diatomite is 100:200:0.5, and mix to form a mixture;

[0038] Place the mixture in a low-temperature device, and while stirring ultrasonically, first cool it down to 5°C at a rate of 1.0°C / min, heat it for crystallization for 3 hours, then cool it down to -30°C at a rate of 1.3°C / min, hold it for 2.5 hours, and heat it for crystallization. 300w, stirring rate n=15r / min;

[0039] After low-temperature crystallization, separate the crystals and uncrystallized liquid by vacuum filtration, centrifuge to remove the crystal aid in the uncrystallized liquid, and molecularly distill to r...

Embodiment 2

[0041] The method for enriching fish oil EPA and DHA through low-temperature crystallization of the present invention comprises the following steps:

[0042] Ethyl-esterified fish oil was heated at 35°C for 25 minutes, and the mass percent content of EPA and DHA in the ethyl-esterified fish oil was 55%;

[0043] Add absolute ethanol and clay to fish oil, the mass ratio of fish oil, absolute alcohol and clay is 100:400:1, and mix to form a mixture;

[0044] Place the mixture in a low-temperature device, and while stirring ultrasonically, first cool it down to 0°C at a rate of 1.3°C / min, keep it crystallized for 3.5 hours, then cool it down to -35°C at a rate of 1.5°C / min, hold it for 3 hours, and heat it to crystallize. 350w, stirring rate n=20r / min;

[0045] After low-temperature crystallization, separate the crystals and uncrystallized liquid by vacuum filtration, centrifuge to remove the crystal aid in the uncrystallized liquid, and molecularly distill to remove the organic...

Embodiment 3

[0047] The method for enriching fish oil EPA and DHA through low-temperature crystallization of the present invention comprises the following steps:

[0048] Ethyl-esterified fish oil was heated at 40°C for 20 minutes, and the mass percent content of EPA and DHA in the ethyl-esterified fish oil was 60%;

[0049] Add acetone and diatomaceous earth to fish oil, the mass ratio of fish oil, acetone and diatomite is 100:600:1.5, and mix to form a mixture;

[0050] Place the mixture in a low-temperature device, and while stirring ultrasonically, first cool it down to -3°C at a rate of 1.5°C / min, heat it for crystallization for 4 hours, then cool it down to -40°C at a rate of 1.8°C / min, hold it for 3.5 hours, and ultrasonically Power 400w, stirring speed n=25r / min;

[0051] After low-temperature crystallization, separate the crystals and uncrystallized liquid by vacuum filtration, centrifuge to remove the crystal aid in the uncrystallized liquid, and molecularly distill to remove th...

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Abstract

The invention relates to a method for enriching fish oil EPA and DHA by low temperature crystallization, and belongs to the technical fields of aquatic product processing and health care products. Themethod comprises the following steps: pretreating fish oil, and then adding an organic solvent and a nucleation assisting agent in the fish oil, wherein the mass ratio of the fish oil to the organicsolvent to the nucleation assisting agent is 100 to (200-1000) to (0.5-2); mixing evenly, carrying out low temperature crystallization, carrying out vacuum suction filtration and separation of a crystal and a non-crystallized liquid, then removing the organic solvent and the nucleation assisting agent in the non-crystallized liquid, and thus obtaining the enriched fish oil EPA and DHA. The methodfor enriching the fish oil EPA and DHA by low temperature crystallization has the advantages of simple equipment, easy operation, large single treatment quantity and low cost, allows effective components not to easily undergo oxidization, isomerization, polymerization and other reactions, and is well able to maintain the natural activity of the EPA and DHA.

Description

technical field [0001] The invention belongs to the technical field of aquatic product processing and health products, and relates to a method for enriching fish oil EPA and DHA through low-temperature crystallization. Background technique [0002] Today, China has grown into the third largest EPA and DHA oil market in the world. DHA+EPA has obtained the new resource food certification and will soon be included in DRI, which will help further increase consumer awareness. As the income, education level and health awareness of Chinese consumers increase year by year, EPA and DHA are used for physiological functions such as preventing atherosclerosis and cardiovascular diseases, preventing and fighting cancer, improving brain function, improving memory, and promoting the intellectual development of infants and young children. With a general understanding, especially the increase of my country's aging population in recent years, it is bound to bring new market opportunities for E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B3/00C07C51/42C07C51/43C07C57/03A23L33/12
Inventor 张绍鸿吴占春方旭波
Owner FUNCTION (QINGDAO) MARINE TECH CO LTD
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