Double gel with hermetia illucens oil as oil phase and preparation method of double gel

Abstract

The invention provides a double gel taking hermetia illucens oil as an oil phase and a preparation method thereof, the preparation method comprises the following steps: dissolving an oil-soluble active substance in hermetia illucens oil, and adding candelilla wax to obtain an oil gel; dissolving whey protein in deionized water to obtain internal water phase gel; mixing the internal water phase gel and the oil gel to obtain a water-in-oil W1G / OG primary emulsion; dispersing lecithin and calcium carbonate in deionized water to serve as an outer water phase, and dispersing the W1G / OG primary emulsion in the outer water phase to obtain water-in-oil-in-water W1G / OG / W2 multiple emulsion; and mixing the W1G / OG / W2 multiple emulsion with the sodium alginate-carrageenan mixed solution, adding the gluconic acid-delta-lactone solution, and standing to obtain the double gel taking the hermetia illucens oil as the oil phase. A synthetic emulsifier is replaced by hermetia illucens oil, an oil phase gelation technology and an external water phase dual-network gelation technology are combined, and a multiple physical barrier is constructed through a GDL endogenous gel method, so that a difunctional emulsion delivery system with high physical stability and DHA antioxidant stability is prepared.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional food, cosmetics or pharmaceutical preparations, in particular to a double gel with black soldier fly oil as oil phase and a preparation method thereof. BACKGROUND

[0002] Emulsion systems are widely used in food, cosmetics and pharmaceuticals, but their physical instability (such as delamination, flocculation, oswald ripening) and chemical instability (such as lipid oxidation) are long-term challenges faced by the industry. Especially for water-in-oil-in-water (W / O / W) double emulsion used for delivering high-value unsaturated fatty acids (such as DHA), its complex "water-in-oil" structure is extremely unstable, and DHA is extremely susceptible to oxidative degradation, which poses a serious technical barrier to its preparation and application. In industrial production, synthetic emulsifiers (such as PGPR) are often added to stabilize the internal water-in-oil structure, but such additives not only go against the consumer trend of "clean label", but also may introduce undesirable flavors, and their functions are relatively single, and they cannot effectively solve the chemical oxidation problem of active substances such as DHA. Whey protein and lecithin are high-quality natural emulsifiers, but it is difficult to build a strong stable emulsion system that can withstand long-term storage, heat treatment and freeze-thaw cycles by relying on their interfacial adsorption alone. SUMMARY

[0003] In view of the technical problems in the background art, the present application provides a double gel with black soldier fly oil as oil phase and a preparation method thereof, aiming to solve the technical problems of physical instability and chemical instability of the existing double emulsion structure.

[0004] In a first aspect, the present application provides a preparation method of a double gel with black soldier fly oil as oil phase, comprising the following steps: S1, dissolving an oil-soluble active substance in black soldier fly oil, adding candelilla wax to dissolve by heating, and obtaining an oil gel loaded with the active substance after cooling; S2, mixing the inner water phase gel and the oil gel, and obtaining a water-in-oil W1G / OG primary emulsion after high-speed homogenization; S3, dispersing lecithin and calcium carbonate in deionized water as an outer water phase, dispersing the W1G / OG primary emulsion in the outer water phase, and obtaining a water-in-oil-in-water W1G / OG / W2 multiple emulsion by high-speed homogenization; S4, mixing the W1G / OG / W2 multiple emulsion with a mixed solution of sodium alginate-carrageenan, adding a gluconic acid-delta-lactone solution during shearing, and then standing to obtain a double gel with black soldier fly oil as oil phase.

[0005] In a second aspect, the present application provides a double gel with black soldier fly oil as oil phase, which is prepared by the above preparation method.​

[0006] Compared with the prior art, the beneficial effects of the present application include: The present application uses black soldier fly oil as a new functional oil phase to replace synthetic emulsifiers, combines oil phase gelation technology and external water phase double network gelation technology (sodium alginate and carrageenan synergistic effect), and constructs a multiple physical barrier through glucose acid-delta-lactone (GDL) endogenous gelation method, so as to prepare a dual-functional emulsion delivery system with high physical stability and DHA antioxidant stability.

[0007] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the present application, the drawings used in the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0009] Figure 1 It is the polarizing microscope graph of pure black soldier fly oil in the present application.

[0010] Figure 2 It is the polarizing microscope graph of the double gel prepared in Example 1 of the present application.

[0011] Figure 3 It is the polarizing microscope graph of the double gel prepared in Example 2 of the present application.

[0012] Figure 4 It is the rheological strain scanning curve of the double gel prepared in Example 1-3 and Comparative Example 1 of the present application. DETAILED DESCRIPTION

[0013] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, therefore only as an example, and cannot limit the protection scope of the present application.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0015] Emulsion systems are widely used in food, cosmetic and pharmaceutical industries, but their physical instability (e.g. creaming, flocculation, oswald ripening) and chemical instability (e.g. lipid oxidation) are long-standing challenges in the industry. Especially for water-in-oil-in-water (W / O / W) double emulsion used for delivering high-value but unsaturated fatty acids (e.g. DHA), its complex "water-in-oil" structure is extremely unstable, and DHA is extremely susceptible to oxidative degradation, which poses a serious technical barrier to its preparation and application.

[0016] To solve the technical problems of physical instability and chemical instability of existing double emulsion structure, the present application provides a double gel with black soldier fly oil as oil phase and a preparation method thereof. The present application uses black soldier fly oil as a new functional oil phase to replace synthetic emulsifiers, combines oil phase gelation technology and external water phase double network gelation technology (sodium alginate and carrageenan synergistic effect), and constructs a multiple physical barrier through glucose acid-delta-lactone (GDL) endogenous gelation method, thereby preparing a double functional emulsion delivery system with high physical stability and DHA antioxidant stability.

[0017] In a first aspect, the embodiments of the present application provide a preparation method of a double gel with black soldier fly oil as oil phase, comprising the following steps: S1, dissolving an oil-soluble active substance in black soldier fly oil, adding candelilla wax for heating and dissolving, and obtaining an oil gel loaded with the active substance after cooling; S2, mixing the internal water phase gel and the oil gel, and obtaining a water-in-oil W1G / OG primary emulsion after high-speed homogenization; S2, mixing the internal water phase gel and the oil gel, and obtaining a water-in-oil W1G / OG primary emulsion after high-speed homogenization; S3, dispersing lecithin and calcium carbonate in deionized water as an external water phase, dispersing the W1G / OG primary emulsion in the external water phase, and obtaining a water-in-oil-in-water W1G / OG / W2 multiple emulsion after high-speed homogenization; S4, mixing the W1G / OG / W2 multiple emulsion with a sodium alginate-carrageenan mixed solution, adding a glucose acid-delta-lactone solution during shearing, and then standing to obtain a double gel with black soldier fly oil as oil phase.

[0018] In the technical solutions of the embodiments of the present application, the black soldier fly oil is developed as a new type of functional oil phase, and in combination with the oil phase gelation technology, it participates in the construction of multiple physical barriers (oil gel network), effectively limiting the migration and coalescence of the inner water phase droplets. The system can significantly improve the antioxidant stability of the embedded active substance (such as DHA), and prevent its oxidative degradation.

[0019] The candelilla wax is used as an oil gel factor in the system of the present application. In step S1, it is dissolved in the black soldier fly oil, and after cooling, it crystallizes to form a three-dimensional network skeleton, converting the liquid oil into an oil gel. Its role is to produce a steric hindrance effect, “locking” the inner water phase droplets and active substances in the grid, limiting the free flow of water molecules, preventing droplet collision, migration and merging, thereby greatly improving the physical stability of the emulsion.

[0020] The present application constructs a W1 / O / W2 type double gel system with multiple physical barriers, and its unique stability mechanism is as follows: (1) Physical solidification of the inner water phase (W1): Unlike the traditional liquid inner water phase, the present application uses the thermal gelation characteristics of whey protein to convert W1 into semi-solid gel particles. This change in physical state greatly limits the free flow of water molecules, fundamentally preventing the collision, migration and merging (coalescence) of the inner water phase droplets in the oil phase, thereby significantly improving the stability of the W1G / OG colostrum.

[0021] (2) “In situ” ionic crosslinking of the outer water phase (W2): The present application innovatively uses a combination of calcium carbonate (CaCO3) and glucono-delta-lactone (GDL).

[0022] Calcium carbonate: as a poorly soluble calcium source, it is uniformly dispersed in the system in advance as a “calcium reservoir”; GDL: as a pH-regulated “trigger”, it slowly hydrolyzes in water to produce gluconic acid, causing the pH value of the system to uniformly and gently decrease.

[0023] This slow-release mechanism allows Ca 2+ to be released in a controlled manner and uniformly ionically crosslinked with sodium alginate. This avoids the local severe gelation and caking caused by direct addition of calcium salt, thereby forming a sodium alginate-carrageenan double network hydrogel matrix with uniform structure, delicate texture and high mechanical strength, firmly “locking” the colostrum particles in the three-dimensional network.

[0024] Further, in some embodiments, the oil-soluble active substance includes DHA.

[0025] Further, in some embodiments, the volume ratio of DHA to black soldier fly oil is (1-3): 1200.

[0026] Further, in some embodiments, the heating temperature of the candelilla wax in step S1 is 65-75°C.

[0027] Further, in some embodiments, the mass fraction of whey protein in the inner aqueous phase gel is 10%, and the heating temperature is 75-85°C.

[0028] Further, in some embodiments, the volume ratio of the inner aqueous phase gel to the oil gel in step S2 is 1:(4-5), the homogenization speed is 12000-15000 r / min, and the homogenization time is 2-3 min.

[0029] Further, in some embodiments, the mass fraction of lecithin in the outer aqueous phase in step S3 is 2%-4%, and the mass fraction of calcium carbonate is 0.5%-1%.

[0030] Further, in some embodiments, the volume ratio of the W1G / OG colostrum to the outer aqueous phase is (1-2):(4-5), the homogenization speed is 8000-12000 r / min, and the homogenization time is 2-3 min.

[0031] Further, in some embodiments, the sodium alginate and carrageenan mixed solution in step S4 is prepared by stirring and dispersing sodium alginate and carrageenan in deionized water at a temperature of 70-80°C, and the mass fraction of sodium alginate and carrageenan is 2%-4%.

[0032] Further, in some embodiments, the mass fraction of glucono-delta-lactone solution is 10%-13%.

[0033] Further, in some embodiments, the volume ratio of the glucono-delta-lactone solution to the W1G / OG / W2 multiple emulsion is 2:(13-15).

[0034] Further, in some embodiments, the volume ratio of the W1G / OG / W2 multiple emulsion to the sodium alginate-carrageenan mixed solution in step S4 is (13-15):2.

[0035] Further, in some embodiments, the shear speed in step S4 is 8000-12000 r / min, and the time is 25-30 s.

[0036] Further, in some embodiments, the standing condition is 30-40 min at room temperature.

[0037] In a second aspect, the embodiments of the present application provide a double gel with black soldier fly oil as the oil phase, which is prepared by the above method.

[0038] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application. If the specific technology or condition is not specified in the examples, it is carried out according to the technology or condition described in the literature in the art or according to the product manual. If the reagent or instrument used is not specified by the manufacturer, it is a conventional product that can be obtained by purchase.

[0039] I. Preparation method Example 1 A preparation method of a double gel with black soldier fly oil as the oil phase, comprising the following steps: S1, 10 mg of DHA is dissolved in 12 g of black soldier fly oil, small candle wax is added and heated to 65°C to dissolve, and after cooling, an oil gel loaded with active substances is obtained; 1 g of whey protein is dispersed in 9 g of deionized water, heated to 75°C and stirred to dissolve, to obtain an inner aqueous phase gel with a whey protein mass fraction of 10%; S2, the inner aqueous phase gel and the oil gel are mixed at a volume ratio of 1:4, and after high-speed homogenization at a speed of 15000 r / min for 3 min, a water-in-oil W1G / OG primary emulsion is obtained; S3, lecithin and calcium carbonate are dispersed in deionized water as an outer aqueous phase, wherein the mass fraction of lecithin is 3% and the mass fraction of calcium carbonate is 0.75%, the W1G / OG primary emulsion is dispersed in the outer aqueous phase, and the volume ratio of the W1G / OG primary emulsion to the outer aqueous phase is 1:4, and after high-speed homogenization at 8000 r / min for 2 min, a water-in-oil-in-water W1G / OG / W2 multiple emulsion is obtained; S4, sodium alginate and carrageenan are dissolved in deionized water at a mass ratio of 3:1 at 70°C to obtain a mixed solution of sodium alginate-carrageenan with a mass fraction of 3%, 13 mL of the W1G / OG / W2 multiple emulsion is mixed with 2 mL of the mixed solution of sodium alginate-carrageenan, and 2 mL of a glucono-delta-lactone solution with a mass fraction of 11.5% is added during shearing, followed by standing for 30 min, to obtain a double gel with black soldier fly oil as the oil phase.

[0040] Example 2 Example 2 differs from Example 1 in that the mass fraction of lecithin is 2%, the mass fraction of calcium carbonate is 0.5%, the mass fraction of sodium alginate / carrageenan mixed solution is 2%, and the mass fraction of GDL solution is 10%, and the other steps are the same as those of Example 1.

[0041] Example 3 Example 3 differs from Example 1 in that the mass fraction of lecithin is 4%, the mass fraction of calcium carbonate is 1%, the mass fraction of sodium alginate / carrageenan mixed solution is 4%, and the mass fraction of GDL solution is 13%, and the other steps are the same as those of Example 1.

[0042] Comparative Example 1 Comparative Example 1 differs from Example 1 in that no GDL solution is added in Step S4, and instead an equal mass of deionized water is used, and the other steps are the same as in Example 1.

[0043] II. Test Methods 1. Rheological property detection method: select 50 mm parallel plates, frequency 1 Hz, strain 0.25%, place the sample uniformly on the rheometer test plate and seal the gap with vaseline to prevent water evaporation during the heating process, heat from 25°C to 80°C at a rate of 5°C / min, hold for 3 min, then cool from 80°C to 25°C at a rate of 5°C / min.

[0044] 2. Texture property detection method: use a texture analyzer to prepare the sample into a uniform cylindrical shape, select probe type P / 0.5, lower the distance by 5 mm, pre-measurement speed 2 mm / s, measurement speed 1 mm / s, post-measurement speed 5 mm / s, compression ratio 50% then return to the starting position. For each sample, at least three repeated measurements of the texture properties are made.

[0045] III. Analysis of Test Results of Each Example and Comparative Example (1) The pure black soldier fly oil and the double gel prepared in Examples 1-2 were observed using a polarizing microscope (PLM), and the following results were obtained. Figures 1-3 .

[0046] As shown in Figure 1 , the pure black soldier fly oil appears as a full dark field under polarized light. This is because liquid oil is an isotropic fluid and has no birefringence effect on light, indicating that it has not formed any ordered crystal structure inside, which is the fundamental reason for its poor physical stability and easy flow.

[0047] As shown in Figure 2 , the double gel prepared in Example 1 appears as a very dense, uniform and continuous bright color texture under polarized light, almost covering the entire field of view. This indicates that under the optimal formulation ratio (especially the synergistic effect of sufficient calcium cross-linking induced by GDL and the appropriate wax concentration), a high-density three-dimensional network skeleton is formed inside the system.

[0048] As shown in Figure 3 , when prepared into a double gel according to the formulation of Example 2 (lower concentration of gel factor), obvious bright needle-shaped and fine granular crystals appear in the field of view. These bright spots are due to the crystallization of candelilla wax in the oil phase and the scattering of light by the sodium alginate-calcium cross-linked network. This indicates that even at a lower addition amount, a physical gel network that can bind the flow of liquid oil has been successfully constructed inside the system, achieving a gelation transition.

[0049] Analysis conclusion: Comparison Figure 2 and 3 It can be seen that with the increase of gel matrix concentration, the density of the micronetwork significantly increases. This dense network structure ( Figure 2 This provides a stronger steric hindrance effect, thus more effectively locking the internal aqueous phase (W1) droplets and active material (DHA) within the grid, preventing their migration and aggregation. This difference in microstructure is highly consistent with the results of subsequent rheological tests in Example 1, which showed higher storage modulus (G') and yield stress.

[0050] (2) The rheological properties of the bigels prepared in Examples 1-3 and Comparative Example 1 were tested, and the test results are shown in the figure. Figure 4 , Figure 4 The horizontal axis represents strain (Strain %), and the vertical axis represents storage modulus (G') and loss modulus (G''). Storage modulus represents the elastic characteristics of the sample (i.e., gel strength), and loss modulus represents the viscous characteristics of the sample.

[0051] from Figure 4 As can be seen, the dual-gel samples of Examples 1-3 all exhibit a stable plateau region (linear viscoelastic region, LVR) in terms of storage modulus within the low strain range (0.1%~10%), and the storage modulus (G') is always significantly greater than the values ​​of the storage modulus (G') and loss modulus (G''). This indicates that the dual-gel system prepared in this invention forms a strong gel network structure dominated by elasticity, with the internal oil droplets tightly fixed in a three-dimensional network of sodium alginate-calcium crosslinked, exhibiting excellent resistance to external deformation and endowing the product with good anti-settling properties and physical stability.

[0052] Comparing examples with different formulations, the gel strength exhibits a significant gradient change: Example 3 (high concentration formulation) has the highest plateau value, approximately 2500 Pa; The plateau value of Example 1 (preferred formulation) is in the middle, approximately 1500 Pa; The plateau value of Example 2 (low concentration formulation) is relatively low, approximately 700 Pa.

[0053] This result is highly consistent with the aforementioned observations from polarized light microscopy. As the concentrations of GDL and gelling agent in the system increase, more calcium ions are released, inducing sodium alginate to form a denser and more robust "egg-box" cross-linked structure, resulting in a significant increase in storage modulus (hardness) on a macroscopic scale. This high modulus characteristic means that Examples 3 and 1 are less prone to stratification or oil separation during long-term storage.

[0054] In contrast, the G' and G" values of Control Example 1 were both extremely low (close to 0 Pa), and the curve was disordered, showing the typical characteristics of a liquid fluid. This is because no GDL was added in the Control Example (or lack of effective calcium release mechanism), resulting in the inability of sodium alginate to undergo in-situ gelation reaction, and the system failed to form a continuous phase network supporting the oil droplets. This reversely proves that the use of GDL to regulate pH value to trigger in-situ gelation is a key technical feature of the stable double gel system.

[0055] (3) The texture properties of the double gels prepared in Examples 1-3 and Control Example 1 were detected, and the detection results are shown in Table 1 below.

[0056] Table 1 Texture property detection results of double gels prepared in Examples 1-3 and Control Example 1

[0057] Note: The data in the table are represented as mean ± standard deviation (n=3). The same column with different superscript letters (a-d) represent significant differences (p<0.05).

[0058] Hardness reflects the ability of the sample to resist deformation. As can be seen from Table 1, the hardness of each sample shows a trend of Example 3 > Example 1 > Example 2 > Control Example 1. The hardness of Example 3 is the highest (256.44 g), because the high concentration of GDL induces more Ca 2+ , which promotes the formation of a high-density "egg box" cross-linked network of sodium alginate, and at the same time cooperates with carrageenan to build a dense gel skeleton, which is consistent with the result of the highest storage modulus in the previous rheological test.

[0059] Although the hardness of Example 2 is relatively low (85.32 g), it still maintains a good gel morphology and a relatively soft texture, indicating that the formula of the present application is still effective at low concentrations.

[0060] In contrast, the hardness of Control Example 1 is extremely low (only 12.45 g), and it cannot maintain a fixed geometric shape. This confirms that in the absence of GDL acid release, the system mainly exists in the form of a liquid emulsion, lacking the support of a gel network.

[0061] Elasticity reflects the recovery ability of the gel after deformation under stress, and cohesiveness reflects the binding force of the internal structure of the gel.

[0062] Both Example 1 and 3 exhibited excellent elasticity (>0.85) and cohesiveness, indicating that a complete spatial network structure was formed within the system, and the oil droplets were firmly wrapped in the gel matrix. This structure helps maintain the integrity of the product during processing and transportation, preventing breakage or delamination.

[0063] (4) In order to visually evaluate the influence of different formulations on the formation of the double gel system, the appearance of the prepared fresh samples was observed, and the gelation state was evaluated by the "inverted test tube method" (i.e., the sample bottle was inverted for 30 seconds at room temperature, and whether it flowed was observed). The results are shown in Table 2.

[0064] Table 2 Evaluation of the appearance and gelation state of the double gel prepared in Examples 1-3 and Comparative Example 1

[0065] As can be seen from Table 2, Examples 1-3 all successfully formed a self-supporting gel structure. With the increase of the concentration of the gel factor, the sample changed from a weak gel with a relatively soft texture (Example 2) to a strong gel with a compact structure (Example 3). This indicates that the ion crosslinking network induced by GDL effectively binds the flow of the liquid phase.

[0066] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications that can be thought of by those skilled in the art, other ways constructed by combining part of the constituent elements of the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing a double gel with black soldier fly oil as the oil phase, characterized by, The preparation method comprises the following steps: S1, dissolving the oil-soluble active substance in black soldier fly oil, adding candelilla wax to dissolve, and obtaining oil gel loaded with the active substance after cooling; S2, mixing the inner water phase gel and the oil gel, and obtaining water-in-oil W1G / OG colostrum after high-speed homogenization; S3, dispersing lecithin and calcium carbonate in deionized water as an outer water phase, dispersing the W1G / OG colostrum in the outer water phase, and obtaining water-in-oil-in-water W1G / OG / W2 multiple emulsion after high-speed homogenization; S4, mixing the W1G / OG / W2 multiple emulsion with a mixed solution of sodium alginate and carrageenan, adding a gluconic acid-delta-lactone solution during shearing, and then standing to obtain a double gel with black soldier fly oil as the oil phase. The oil-soluble active substance comprises DHA; 2. The method for preparing a double gel with black soldier fly oil as the oil phase according to claim 1, characterized in that, The volume ratio of the DHA to the black soldier fly oil is (1-3):1200. The heating temperature of the candelilla wax in step S1 is 65-75°C; 3. The method of claim 1, wherein the double gel with black soldier fly oil as an oil phase is characterized by, The mass fraction of the whey protein in the inner water phase gel is 10%, and the heating temperature is 75-85°C. In step S2, the volume ratio of the inner water phase gel to the oil gel is 1:(4-5), the homogenization speed is 12000-15000 r / min, and the homogenization time is 2-3 min.

4. The method for preparing a double gel with black soldier fly oil as the oil phase according to claim 1, characterized in that, In step S3, the mass fraction of lecithin in the outer water phase is 2%-4%, and the mass fraction of calcium carbonate is 0.5%-1%; 5. The method of claim 1, wherein the biogel with oil phase of black soldier fly oil is prepared by the steps of: In step S3, the volume ratio of the W1G / OG colostrum to the outer water phase is (1-2):(4-5), the homogenization speed is 8000-12000 r / min, and the homogenization time is 2-3 min. In step S4, the mixed solution of sodium alginate and carrageenan is prepared by stirring and dispersing sodium alginate and carrageenan in deionized water at a temperature of 70-80°C, and the mass fraction of sodium alginate and carrageenan is 2%-4%.

6. The method of claim 1, wherein the double gel with black soldier fly oil as an oil phase is characterized by, The mass fraction of the gluconic acid-delta-lactone solution is 10%-13%; 7. The method for preparing a dual gel with black soldier fly oil as the oil phase according to claim 1, characterized in that, The volume ratio of the gluconic acid-delta-lactone solution to the W1G / OG / W2 multiple emulsion is 2:(13-15). In step S4, the volume ratio of the W1G / OG / W2 multiple emulsion to the mixed solution of sodium alginate and carrageenan is (13-15):

2.

8. The method of claim 1, wherein the double gel with black soldier fly oil as an oil phase is characterized by, In step S4, the shearing speed is 8000-12000 r / min, and the time is 25-30 s; 9. The method of claim 1, wherein the double gel with black soldier fly oil as an oil phase is characterized by, The standing condition is 30-40 min at room temperature. The preparation method is prepared by using any one of the preparation methods in claims 1-9.

10. A double gel with black soldier fly oil as the oil phase, characterized in that, ​

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