De-iodinated krill oil and preparation method thereof

Abstract

The invention relates to the technical field of food processing, in particular to deiodinated krill oil and a preparation method thereof.The preparation method comprises the following steps that S1, a deiodination agent is added into krill oil, full stirring is conducted for deiodination treatment, and standing is conducted for preset time after stirring; s2, finely filtering the krill oil subjected to deiodination treatment through a filtering membrane to remove all solid deiodination agents and impurities, and then cleaning the filtered grease with purified water to remove the residual deiodination agents; s3, performing vacuum dehydration treatment on the krill oil treated in the S2 to remove all moisture; s4, performing secondary filtration on the krill oil obtained in S3 through the filter membrane to obtain a deiodinated krill oil finished product; and S5, loading the deiodinated krill oil finished product finally obtained in the step S4 into a dark container, and sealing and storing. The iodine content can be effectively reduced, the grease nutrition is kept complete, the process is simple, convenient and environment-friendly, the method is suitable for large-scale production, and the market competitiveness of the product and the satisfaction degree of consumers are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, and in particular to deiodinated krill oil and a preparation method thereof. Background Art

[0002] Krill oil, as a rich source of Omega-3 fatty acids, occupies an important position in the health care products market. However, since krill live in waters with high iodine content, the iodine content in their oil is relatively high. Long-term intake of high-iodine krill oil may have an adverse effect on the thyroid function of certain populations. Therefore, how to effectively remove iodine from krill oil has become an important research topic. Traditional deiodination technology mainly relies on simple physical adsorption or chemical methods. Although these methods can reduce the iodine content in krill oil to a certain extent, they are often accompanied by problems such as oil oxidation, loss of nutrients or low processing efficiency, which affect the quality and safety of the final product.

[0003] Existing deiodination technologies face multiple challenges such as low processing efficiency, difficulty in ensuring product quality, complex processes and high costs. In particular, the technical difficulty of removing iodine while maintaining the integrity of unsaturated fatty acids in krill oil has not been effectively solved. In addition, the environmental impact and energy consumption of existing methods during the deiodination process are also receiving increasing attention.

[0004] Therefore, developing a new deiodination process that is efficient, environmentally friendly and can retain the nutritional components of krill oil to the greatest extent has become an urgent problem that the industry needs to solve. Summary of the invention

[0005] Based on the above purpose, the present invention provides a deiodinated krill oil and a preparation method thereof.

[0006] A deiodinated krill oil and a preparation method thereof, comprising krill oil and a deiodizing agent; wherein the components are as follows in terms of mass percentage: krill oil: 75-80%; deiodizing agent: 20-25%.

[0007] Furthermore, the deiodine agent is an adsorption resin, activated carbon or ion exchange resin.

[0008] A method for preparing deiodinated krill oil comprises the following steps: S1: adding a deiodine agent to the krill oil, stirring it thoroughly to perform deiodine treatment, and then standing it for a predetermined time; S2: Finely filter the deiodinated krill oil through a filter membrane to remove all solid deiodine agents and impurities, and then wash the filtered oil with purified water to remove residual deiodine agents; S3: vacuum dehydrating the krill oil after treatment in S2 to remove all water; S4: filtering the krill oil in S3 through a filter membrane again to obtain a deiodinated krill oil product; S5: The deiodinated krill oil product obtained in S4 is placed in a light-proof container and sealed for storage.

[0009] Furthermore, the stirring time during the deiodination treatment in S1 is 30-60 minutes, the stirring temperature is 25-35° C., the stirring speed is 200-500 rpm, and the standing time after stirring is 1-3 hours.

[0010] Furthermore, in S2, the deiodinated krill oil is finely filtered through a polyvinylidene fluoride filter membrane with a pore size of 0.2-0.5 microns, and the filtration pressure is 0.1-0.3 MPa. Then, the filtered oil is washed with pure water, the washing volume is 1-3 times the volume of the oil, and the number of washing times is 2-4 times.

[0011] Furthermore, when the vacuum dehydration treatment is performed in S3, the vacuum degree is -0.08 to -0.12 MPa, the dehydration time is 0.5 to 1.5 hours, and the dehydration temperature is 30 to 50° C. to ensure that all moisture is removed.

[0012] Furthermore, in S4, the krill oil in S3 is filtered twice through a polytetrafluoroethylene filter membrane with a pore size of 0.1-0.3 microns, and the filtration pressure is 0.2-0.4 MPa.

[0013] Furthermore, when the deiodinated krill oil product is placed in a light-proof container in S5, the container is made of dark glass or opaque plastic, and is filled with nitrogen before sealing to prevent oxidation. The nitrogen filling pressure is 0.01-0.05 MPa to ensure an oxygen-free environment in the container.

[0014] Beneficial effects of the present invention: The present invention effectively reduces the iodine content in krill oil by adopting optimized deiodination treatment, fine filtration, vacuum dehydration and secondary filtration steps, while minimizing oil oxidation and nutrient loss. By accurately controlling the conditions of each treatment step, such as stirring speed, temperature and time, the method not only improves the deiodination efficiency, but also ensures the stability and safety of the product. In addition, the method also pays special attention to environmental protection and energy efficiency. The filtering materials and equipment used are both energy-efficient, thereby reducing production costs and impacts on the environment.

[0015] The present invention, by using a selective deiodination agent and a specific filtering technology, can ensure the efficient removal of iodine from krill oil without affecting other important nutrients such as Omega-3 fatty acids. The implementation of this method provides krill oil products with higher market competitiveness, meets consumers' demand for healthy, low-iodine marine oil, and also has the characteristics of simple operation and high repeatability, and is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The present invention is a schematic diagram of a method for preparing deiodinated krill oil according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1: Figure 1 As shown, a deiodinated krill oil and a preparation method thereof include krill oil and a deiodizing agent; wherein the components are as follows in terms of mass percentage: krill oil: 77%; deiodizing agent: 23%.

[0021] The deiodine agent is activated carbon.

[0022] A method for preparing deiodinated krill oil comprises the following steps: S1: adding a deiodine agent to the krill oil, stirring it thoroughly to perform deiodine treatment, and then standing it for a predetermined time; S2: Finely filter the deiodinated krill oil through a filter membrane to remove all solid deiodine agents and impurities, and then wash the filtered oil with purified water to remove residual deiodine agents; S3: vacuum dehydrating the krill oil after treatment in S2 to remove all water; S4: filtering the krill oil in S3 through a filter membrane again to obtain a deiodinated krill oil product; S5: The deiodinated krill oil product obtained in S4 is placed in a light-proof container and sealed for storage.

[0023] The stirring time during the deiodination treatment in S1 is 45 minutes, the stirring temperature is 30° C., the stirring speed is 350 rpm, and the standing time after stirring is 2 hours to ensure that the deiodination agent fully absorbs the iodine element.

[0024] In S2, the deiodinated krill oil is finely filtered through a polyvinylidene fluoride (PVDF) filter membrane with a pore size of 0.3 microns and a filtration pressure of 0.2 MPa. The filtered oil is then washed with pure water, with the washing volume being twice the volume of the oil, and the number of washings being 3 times.

[0025] When vacuum dehydration treatment is performed in S3, the vacuum degree is -0.1 MPa, the dehydration time is 1 hour, and the dehydration temperature is 40°C to ensure that all moisture is removed.

[0026] In S4, the krill oil in S3 is filtered twice through a polytetrafluoroethylene (PTFE) filter membrane with a pore size of 0.2 microns and a filtration pressure of 0.3 MPa to ensure the purity and stability of the product.

[0027] When the finished deiodinated krill oil product is placed in a light-proof container in S5, the container is made of opaque plastic and is filled with nitrogen before sealing to prevent oxidation. The nitrogen filling pressure is 0.03MPa to ensure an oxygen-free environment in the container.

[0028] Example 2: Prepare the raw materials: krill oil 80%; deiodine agent (adsorption resin) 20%.

[0029] The preparation steps are as follows: S1: adding adsorption resin as a deiodination agent to krill oil, stirring for 30 minutes, maintaining the stirring temperature at 25°C and the stirring speed at 200 rpm. After the stirring is completed, the krill oil is allowed to stand for 1 hour to ensure that the deiodination agent fully absorbs the iodine element; S2: The deiodinated krill oil is finely filtered through a polyvinylidene fluoride (PVDF) filter membrane with a pore size of 0.2 microns and a filtration pressure of 0.1 MPa, and then washed twice with pure water equal to 1 times the volume of the oil to remove residual deiodine agents and impurities; S3: The krill oil treated in S2 is subjected to vacuum dehydration treatment, and is dehydrated for 0.5 hours at a temperature of 30°C under a vacuum environment of -0.08 MPa to ensure that all water is removed; S4: The krill oil in S3 is filtered again through a polytetrafluoroethylene (PTFE) filter membrane with a pore size of 0.1 micron and a filtration pressure of 0.2 MPa to ensure the purity and stability of the product; S5: The deiodinated krill oil product finally obtained in S4 is placed in a dark glass container and filled with nitrogen before sealing to prevent oxidation. The nitrogen filling pressure is 0.01MPa to ensure an oxygen-free environment in the container and store it in a sealed manner.

[0030] Example 3: Prepare the raw materials: krill oil 75%; deiodine agent (ion exchange resin) 25%.

[0031] The preparation steps are as follows: S1: adding ion exchange resin as a deiodination agent to the krill oil, stirring it for 60 minutes, maintaining the stirring temperature at 35°C and the stirring speed at 500 rpm. After the stirring is completed, the krill oil is allowed to stand for 3 hours to ensure that the deiodination agent fully absorbs the iodine element; S2: The deiodinated krill oil is finely filtered through a polyvinylidene fluoride (PVDF) filter membrane with a pore size of 0.5 microns and a filtration pressure of 0.3 MPa, and then washed four times with pure water equal to 3 times the volume of the oil to remove residual deiodine agents and impurities; S3: vacuum dehydration of the krill oil treated in S2, at a vacuum environment of -0.12MPa and a temperature of 50°C for 1.5 hours to ensure that all water is removed; S4: The krill oil in S3 is filtered again through a polytetrafluoroethylene (PTFE) filter membrane with a pore size of 0.3 microns at a filtration pressure of 0.4 MPa to ensure the purity and stability of the product; S5: The deiodinated krill oil product finally obtained in S4 is placed into a light-proof plastic container and filled with nitrogen before sealing to prevent oxidation. The nitrogen filling pressure is 0.05MPa to ensure an oxygen-free environment in the container and store it in a sealed manner.

[0032] Table 1 Comparison of finished product performance parameters: ; As can be seen from Table 1 above, Example 1 performs well in multiple key indicators, especially in terms of iodine content and oxidative stability. Example 1 has the lowest iodine content, indicating that the deiodination effect is the most significant. At the same time, it has the highest oxidative stability, showing a better shelf life and stability. The preservation rate of vitamin E is also the highest among the three examples, which helps to enhance the nutritional value and antioxidant properties of the product. The product purity and sensory evaluation also show the advantages of Example 1, which makes this example the best production solution. These data emphasize the unique benefits of Example 1 in producing high-quality deiodinated krill oil, and it is the preferred solution with commercial application value.

[0033] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A deiodinated krill oil, characterized in that: It comprises krill oil and deiodine agent; wherein the components are as follows in terms of mass percentage: krill oil: 75-80%; deiodine agent: 20-25%.

2. The deiodinated krill oil according to claim 1, characterized in that: The deiodine agent is an adsorption resin, activated carbon or an ion exchange resin.

3. A method for preparing deiodinated krill oil according to any one of claims 1-2, characterized in that: The following steps are involved: S1: adding a deiodine agent to the krill oil, stirring it thoroughly to perform deiodine treatment, and then standing it for a predetermined time; S2: Finely filter the deiodinated krill oil through a filter membrane to remove all solid deiodine agents and impurities, and then wash the filtered oil with purified water to remove residual deiodine agents; S3: vacuum dehydrating the krill oil after treatment in S2 to remove all water; S4: filtering the krill oil in S3 through a filter membrane again to obtain a deiodinated krill oil product; S5: The deiodinated krill oil product obtained in S4 is placed in a light-proof container and sealed for storage.

4. The method for preparing deiodinated krill oil according to claim 3, characterized in that: The stirring time during the deiodination treatment in S1 is 30-60 minutes, the stirring temperature is 25-35° C., the stirring speed is 200-500 rpm, and the standing time after stirring is 1-3 hours.

5. The method for preparing deiodinated krill oil according to claim 3, characterized in that: In S2, the deiodinated krill oil is finely filtered through a polyvinylidene fluoride filter membrane with a pore size of 0.2-0.5 microns, and the filtration pressure is 0.1-0.3 MPa. Then, the filtered oil is washed with pure water, the washing volume is 1-3 times the volume of the oil, and the number of washing times is 2-4 times.

6. The method for preparing deiodinated krill oil according to claim 3, characterized in that: When the vacuum dehydration treatment is performed in S3, the vacuum degree is -0.08 to -0.12 MPa, the dehydration time is 0.5 to 1.5 hours, and the dehydration temperature is 30 to 50° C. to ensure that all moisture is removed.

7. The method for preparing deiodinated krill oil according to claim 3, characterized in that: In S4, the krill oil in S3 is filtered twice through a polytetrafluoroethylene filter membrane with a pore size of 0.1-0.3 microns, and the filtration pressure is 0.2-0.4 MPa.

8. The method for preparing deiodinated krill oil according to claim 3, characterized in that: When the deiodinated krill oil product is placed in a light-proof container in S5, the container is made of dark glass or opaque plastic, and is filled with nitrogen before sealing to prevent oxidation. The nitrogen filling pressure is 0.01-0.05 MPa to ensure an oxygen-free environment in the container.

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