Method for extracting hermetia illucens grease through hot pressing

Abstract

The invention relates to the technical field of insect grease extraction, and discloses a method for extracting hermetia illucens grease through hot pressing. The method comprises the following steps: (1) cooking hermetia illucens larvae in hot water at 40-75 DEG C for 5-15 minutes, and cleaning to obtain a larva material I; (2) drying the larvae I at the temperature of 60 to 80 DEG C, so as to obtain a larva material II with the water content of 55.0 to 67.5 weight percent; (3) mechanically squeezing the larva material II at the temperature of 80-100 DEG C to obtain slurry; and (4) centrifugally separating the slurry into an oil phase, a water phase and a solid phase, and recovering the oil phase to obtain the hermetia illucens grease. The method provided by the invention can significantly improve the yield and quality of the hermetia illucens grease extracted by hot pressing, and can effectively solve the problems of low high-valued utilization rate and low grease extraction efficiency of large hermetia illucens breeding factories.

Description

Technical Field

[0001] The invention relates to the technical field of insect oil extraction, and in particular to a method for extracting black soldier fly oil by hot pressing. Background Art

[0002] The black soldier fly (Hermetia illucens), an insect of high economic value, has garnered widespread attention in recent years in environmental protection, agriculture, and food sectors. The oil produced by black soldier flies, primarily from their larvae, is rich in unsaturated fatty acids, particularly oleic and linoleic acids, which are beneficial to human health. Therefore, it possesses high nutritional value and potential for industrial applications. The extraction of black soldier fly oil is crucial in industrial production, directly impacting extraction efficiency, oil quality, and economic benefits.

[0003] Currently, the main methods for extracting black soldier fly oil include solvent extraction, supercritical fluid extraction, cold pressing, and hot pressing. Hot pressing, as a relatively simple, environmentally friendly, and efficient physical extraction method, has been widely adopted for the industrial production of black soldier fly oil. Hot pressing extracts extract oil from black soldier fly larvae through high temperature and pressure, resulting in a high oil recovery rate. Compared to solvent extraction, hot pressing avoids the use of toxic solvents, making it safer for use in industries such as food and cosmetics.

[0004] However, the existing hot-pressing extraction process for black soldier fly oil still leaves room for improvement. Traditional hot-pressing extraction processes suffer from long extraction times, high energy consumption, and low oil recovery rates. Furthermore, optimal control of temperature and pressure during the extraction process, as well as optimization of the pre-treatment of the black soldier fly larvae, remain suboptimal. Optimizing the hot-pressing extraction process to improve oil extraction efficiency, reduce energy consumption, and ensure oil quality has become a key area of ​​technological development. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems existing in the prior art of the hot pressing method for extracting oil, such as low efficiency, high energy consumption, and low quality of the extracted oil.

[0006] In order to achieve the above object, the present invention provides a method for extracting black soldier fly oil by hot pressing, the method comprising the following steps:

[0007] (1) boiling black soldier fly larvae in hot water at 40-75° C. for 5-15 minutes, washing, and obtaining larval feed I;

[0008] (2) drying the larvae I at 60-80° C. to obtain a larvae material II having a moisture content of 55.0-67.5 wt %;

[0009] (3) mechanically pressing the larval material II at 80-100° C. to obtain a slurry;

[0010] (4) The slurry is centrifuged to separate into an oil phase, an aqueous phase and a solid phase, and the oil phase is recovered to obtain black soldier fly oil.

[0011] Compared with the prior art, the present invention has at least the following advantages:

[0012] (1) The present invention boils and dries black soldier fly larvae, effectively destroying their outer hard shell and internal tissue structure. The gradient-optimized boiling method is more conducive to the precipitation and extraction of oil. The use of appropriate temperature and humidity control during the pressing process can significantly improve the extraction efficiency and recovery rate of oil. During the process, the temperature and operation time are reasonably controlled, effectively reducing unnecessary energy consumption, shortening the overall extraction time, and lowering production costs.

[0013] (2) By optimizing the key parameter of moisture content, oil can be more fully extracted from the black soldier fly larvae. Centrifugal separation can further improve the purity and recovery rate of the oil, thus avoiding oil waste.

[0014] (3) Compared with traditional solvent extraction, the hot-pressing extraction process avoids the use of harmful solvents, is simpler and more environmentally friendly, and produces no chemical waste, which is in line with the trend of green manufacturing. This process can be flexibly adjusted according to the specifications of different batches of black soldier fly larvae. Whether it is small-scale experimental research or large-scale industrial production, it can achieve good extraction results and has strong adaptability. DETAILED DESCRIPTION

[0015] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0016] As mentioned above, the present invention provides a method for extracting black soldier fly oil by hot pressing, which comprises the following steps:

[0017] (1) boiling black soldier fly larvae in hot water at 40-75° C. for 5-15 minutes, washing, and obtaining larval feed I;

[0018] (2) drying the larvae I at 60-80° C. to obtain a larvae material II having a moisture content of 55.0-67.5 wt %;

[0019] (3) mechanically pressing the larval material II at 80-100° C. to obtain a slurry;

[0020] (4) The slurry is centrifuged to separate into an oil phase, an aqueous phase and a solid phase, and the oil phase is recovered to obtain black soldier fly oil.

[0021] Preferably, in step (2), the larvae I are dried at 60-80° C., and the drying time is controlled to obtain a larvae material II with a moisture content of 57.0-66.5 wt %.

[0022] Preferably, in step (1), the black soldier fly larvae are 5th instar.

[0023] Preferably, in step (1), the hot water boiling step includes: first maintaining the black soldier fly larvae in 40-50°C hot water for 2-5 minutes, then raising the temperature to 55-65°C at a rate of 5-10°C / min and maintaining for 2-5 minutes, and finally raising the temperature to 70-75°C at a rate of 5-10°C / min and maintaining for 2-5 minutes, and then washing to obtain larval material I. In this preferred embodiment, the loss of fat in the black soldier fly body due to evaporation can be reduced, which is more conducive to the retention and separation of fat.

[0024] Preferably, in step (1), the ratio of the volume of hot water to the volume of the black soldier fly larvae is 2:1.

[0025] According to a preferred embodiment, in step (1), the insect body is inactivated and surface impurities are removed simultaneously by boiling with hot water.

[0026] Preferably, in step (1), the cleaning step comprises: filtering the black soldier fly larvae boiled in hot water to obtain a filter material insect product; and then rinsing the filter material insect product with hot water at 65-70° C. for 30-40 seconds.

[0027] Preferably, in step (2), the drying time is 3-6 hours.

[0028] Preferably, in step (3), the mechanical pressing is performed using a screw press.

[0029] Preferably, the pressing temperature of the mechanical pressing is 80-100°C.

[0030] According to a preferred embodiment, in step (3), the single addition amount of the larval material II is 200-500 g.

[0031] Preferably, in step (4), the centrifugal separation conditions at least meet the following conditions: a rotation speed of 6000-10000 rpm and a time of 10-20 min.

[0032] The present invention is described in detail below through examples. Unless otherwise specified, the raw materials used are common commercial products.

[0033] Black soldier fly larvae: 5th instar larvae, obtained from a black soldier fly protein conversion base in Shanghai;

[0034] Screw press: Model ZY-22A, purchased from Wenzhou Hongkuo Technology Co., Ltd.

[0035] Example 1

[0036] This embodiment is used to illustrate the method for extracting black soldier fly oil by hot pressing provided by the present invention, which is carried out according to the following steps, including:

[0037] (1) First, the black soldier fly larvae are kept in 40°C hot water for 4 minutes, then the temperature is increased to 55°C at a rate of 8°C / min and kept for 4 minutes, and finally the temperature is increased to 70°C at a rate of 8°C / min and kept for 4 minutes to complete the hot water boiling, so as to achieve the inactivation of the insect body and the removal of surface impurities, and the filtered insect material product is obtained after filtration, and then the larval material I is obtained by rinsing with 70°C hot water for 35 seconds; wherein, the ratio of the volume of hot water to the volume of the black soldier fly larvae is 2:1;

[0038] (2) drying the larvae I at 70° C. to obtain a larvae material II having a moisture content of 57.8 wt %;

[0039] (3) using a screw press, mechanically pressing 300 g of the larval material II at 90° C. to obtain a slurry;

[0040] (4) The slurry was centrifuged at 8000 rpm for 10 min to separate into an oil phase, an aqueous phase, and a solid phase. The oil phase was recovered to obtain black soldier fly oil, which was named P1.

[0041] Example 2

[0042] This example is carried out in a similar manner to Example 1, except that in step (2), the drying time is controlled so that the moisture content of the larval material II after drying is 66.5 wt%;

[0043] Finally, black soldier fly oil was obtained and named P2.

[0044] Example 3

[0045] This example is carried out in a similar manner to Example 1, except that in step (2), the drying time is controlled so that the moisture content of the larval material II after drying is 63.9 wt%;

[0046] Finally, black soldier fly oil was obtained and named P3.

[0047] Example 4

[0048] This example is carried out in a similar manner to Example 1, except that in step (2), the drying time is controlled so that the moisture content of the larval material II after drying is 67.1 wt%;

[0049] Finally, black soldier fly oil was obtained and named P4.

[0050] Example 5

[0051] This example is carried out using a method similar to that of Example 1, except that in step (1), the black soldier fly larvae are directly boiled in hot water at 70° C. for 13 min and washed to obtain larval material I;

[0052] Finally, black soldier fly oil was obtained and named P5.

[0053] Example 6

[0054] This embodiment is carried out using a method similar to that of embodiment 1, except that, in step (1), the black soldier fly larvae obtained by boiling in hot water are rinsed with water at 25°C;

[0055] Finally, black soldier fly oil was obtained and named P6.

[0056] Comparative Example 1

[0057] This comparative example was carried out in a similar manner to Example 1, except that in step (2), the drying time was controlled so that the moisture content of the larval material II after drying was 68.2 wt%;

[0058] Finally, black soldier fly oil was obtained and named DP1.

[0059] Comparative Example 2

[0060] This comparative example was carried out in a similar manner to Example 1, except that in step (2), the drying time was controlled so that the moisture content of the larval material II after drying was 70.3 wt%;

[0061] Finally, black soldier fly oil was obtained and named DP2.

[0062] Comparative Example 3

[0063] This comparative example was carried out in a similar manner to Example 1, except that in step (2), the drying time was controlled so that the moisture content of the larval material II after drying was 54.1 wt%;

[0064] Finally, black soldier fly oil was obtained and named DP3.

[0065] Test Example 1

[0066] The black soldier fly oil obtained in the above examples was analyzed for oil yield, wherein the weight of the solid obtained after mechanical pressing in each example was taken as the weight of the dry residue, the weight of the solid phase obtained after centrifugation was taken as the weight of the wet residue, and the weight of the oil phase obtained after centrifugation was taken as the weight of the oil.

[0067] Please see Table 1 for the results.

[0068] Table 1

[0069]

[0070]

[0071] Test Example 2

[0072] The black soldier fly oil obtained in the above examples was analyzed for oil purity and content of specific components in the oil;

[0073] Please see Table 2 for the results.

[0074] Table 2

[0075] project Oil purity / wt% Lauric acid / wt% Oleic acid / wt% Linoleic acid / wt% P1 95.6 56.2 11.4 8.1 P2 94.7 54.2 11.2 7.9 P3 95.0 54.6 10.8 7.6 P4 94.5 51.5 11.6 7.5 P5 93.6 54.6 11.7 7.8 P6 95.0 55.2 11.2 6.9 DP1 94.2 50.4 10.9 6.4 DP2 94.1 50.1 12.1 6.8 DP3 95.2 54.8 12.5 7.4

[0076] It can be seen from the above results that the optimized process for hot-pressing extraction of black soldier fly oil provided by the present invention can significantly improve the yield and quality of hot-pressed extracted black soldier fly oil, and can effectively solve the problems of low high-value utilization rate of insect products and low oil extraction efficiency in large-scale black soldier fly breeding factories.

[0077] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for extracting black soldier fly oil by hot pressing, characterized in that: The method comprises the following steps: (1) boiling black soldier fly larvae in hot water at 40-75° C. for 5-15 minutes, washing, and obtaining larval feed I; (2) drying the larvae I at 60-80° C. to obtain a larvae material II having a moisture content of 55.0-67.5 wt %; (3) mechanically pressing the larval material II at 80-100° C. to obtain a slurry; (4) The slurry is centrifuged to separate into an oil phase, an aqueous phase and a solid phase, and the oil phase is recovered to obtain black soldier fly oil.

2. The method according to claim 1, characterized in that In step (1), the hot water boiling step comprises: firstly keeping the black soldier fly larvae in 40-50°C hot water for 2-5 minutes, then raising the temperature to 55-65°C at a rate of 5-10°C / min and keeping it for 2-5 minutes, and finally raising the temperature to 70-75°C at a rate of 5-10°C / min and keeping it for 2-5 minutes, and then washing to obtain larval material I.

3. The method according to claim 1 or 2, characterized in that In step (1), the cleaning step includes: filtering the black soldier fly larvae boiled in hot water to obtain a filter material insect product; and then rinsing the filter material insect product with hot water at 65-70° C. for 30-40 seconds.

4. The method according to claim 1 or 2, characterized in that In step (1), the ratio of the volume of hot water to the volume of the black soldier fly larvae is 2:

1.

5. The method according to claim 1 or 2, characterized in that In step (1), the hot water boiling simultaneously achieves the inactivation of the insect body and the removal of surface impurities.

6. The method according to claim 1 or 2, characterized in that In step (3), the mechanical pressing is carried out using a screw press.

7. The method according to claim 1 or 2, characterized in that In step (3), the single addition amount of the larval material II is 200-500 g.

8. The method according to claim 1 or 2, characterized in that In step (4), the centrifugal separation conditions at least meet the following requirements: a rotation speed of 6000-10000 rpm and a time of 10-20 min.

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