Instant walnut protein powder and a preparation method thereof

Abstract

The application discloses a kind of instant walnut protein powder and preparation method thereof, comprising first walnut kernel powder, using supercritical CO2 extraction technology to obtain walnut defatted powder;According to certain proportion, walnut defatted powder, malt dextrin, egg yolk lecithin and purified water are weighed in turn;A portion of purified water is added to walnut defatted powder, malt dextrin and egg yolk lecithin to be stirred and dissolved;After stirring and mixing, first high-speed shearing treatment is carried out by normal pressure shear machine;Then the remaining purified water is added to the emulsified concentrated solution, and second high-speed shearing treatment is carried out;Finally, the solution after two high-speed shearing is spray dried, and the instant walnut protein powder product is obtained.The preparation method of the instant walnut protein powder product provided by the application is a pure physical preparation method, and the preparation process conditions are mild, and good emulsification effect can be achieved under normal temperature and pressure conditions, and the final product has delicate taste, good solubility and dispersibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food processing, and particularly relates to a instant walnut protein powder and a preparation method thereof. BACKGROUND

[0002] Walnut is a traditional Chinese medicine and food product, which has the effects of prolonging life, invigorating the brain and improving intelligence, and has many benefits for human health. The protein content in walnut kernel is 15%-20%, and the oil content is more than 60%. Walnuts can be directly consumed or used to make oil, and the by-product walnut cake after oil extraction is rich in resources, but it is mainly used as fertilizer or feed, and some is discarded or burned, causing great waste of resources and environmental pollution. Studies have found that walnut cake contains rich protein (42%-54%), and the amino acid composition of walnut protein is balanced, with a true digestibility of 86.22%, and has high nutritional value. Therefore, it is necessary to strengthen the development and high-value utilization of walnut by-product resources.

[0003] Although walnut protein is a high-quality plant protein with the above advantages, its application in food processing still faces many challenges. Because walnut protein is mainly composed of glutelin, which accounts for about 72%, the solubility of walnut protein is poor, which limits its application in the food industry.

[0004] In order to fully utilize the walnut by-product walnut cake and improve the added value of walnut, it is necessary to strengthen the research and development of walnut protein products. At present, the protein powder products on the market are prone to "clumping" during water dissolution, and are not easy to disperse quickly, and need to be shaken and stirred vigorously or use water with high temperature to disperse, and after a period of time, stratification phenomenon occurs, resulting in poor eating experience.

[0005] At present, many existing solutions are around how to improve the solubility or dispersibility of protein to improve the performance of protein function, for example (1) Chinese patent application CN202011056020.2 discloses a cold-bubble instant protein powder and a preparation method thereof, by adding specific formula components with certain ratio and composition, and using two-stage spraying method, the main protein powder is coated with trace emulsified soybean phospholipid powder, and the particles are bridged and formed into a porous structure by water-soluble dietary fiber and modified starch, so as to optimize the high dispersibility and high solubility of the protein powder; the preparation method not only has complex spraying process and high cost, but also easily changes the original nature of the protein powder, and in the preparation step, the solution needs to be homogenized under the condition of pressure up to 160-180MPa, which has high requirements for equipment; (2) Chinese patent application CN201711039703.5 discloses a preparation method of walnut protein powder, the shelled walnut is soaked in water and then subjected to emulsification and pulp treatment, the obtained precipitate is centrifuged and then subjected to two emulsification and pulp treatments, the supernatant obtained after the second centrifugation is mixed with the supernatant obtained after the first centrifugation and then heated, and the mixture is homogenized after cooling, filtered, concentrated and sterilized, and then spray-dried to obtain a walnut protein product; the method greatly reduces the yield of walnut protein powder through two centrifugations, and the preparation process also needs to use a homogenizer and homogenize under the condition of 15-35MPa.

[0006] Therefore, how to simply prepare the product and make the product have high dispersibility and high solubility at the same time, and then realize the instant purpose, becomes a main technical problem in the field of protein powder production. SUMMARY

[0007] In order to overcome the problems in the prior art that the preparation process of walnut protein powder often needs to use a high-pressure homogenizer and has high requirements for equipment, the dispersibility and solubility of the prepared walnut protein powder are poor, and the walnut by-products are not well utilized, the first object of the present application is to provide an instant walnut protein powder, and the second object of the present application is to provide a corresponding preparation method of the instant walnut protein powder.

[0008] In order to achieve the above objects, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a preparation method of an instant walnut protein powder, comprising the following steps:

[0010] S1, preparation of walnut defatted powder: grinding walnut kernel powder and defatting by supercritical CO2 extraction technology to obtain walnut defatted powder;

[0011] S2, weighing of raw materials: weighing walnut defatted powder, malt dextrin, egg yolk lecithin and purified water in sequence according to a certain ratio;

[0012] S3, dissolving the materials: add purified water to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stir to dissolve;

[0013] S4, high-speed shearing of the concentrated liquid: after stirring and mixing, perform first high-speed shearing treatment by a normal-pressure shearing machine;

[0014] S5, high-speed shearing of the diluted liquid: then add the remaining purified water to the emulsified concentrated liquid, and perform second high-speed shearing treatment;

[0015] S6, spray drying to make powder: spray dry the solution after the second high-speed shearing, to obtain the instant walnut protein powder product.

[0016] Further, in step S1, the supercritical CO2 extraction defatting conditions are: extraction pressure of 30-55 MPa, extraction temperature of 35-55℃, primary separation pressure of 6-10 MPa, and separation temperature of 40-50℃. The protein raw material in the instant walnut protein powder of the present application is mainly provided by the walnut defatted powder, and the oil component in the walnut kernel is removed by supercritical extraction treatment, thereby correspondingly increasing the content of protein. By using such defatting conditions, the defatting can be more complete, so that the protein content in the walnut defatted powder is higher.

[0017] Further, in step S2, the raw materials of the instant walnut protein powder include 10%-20% of walnut defatted powder, 5%-15% of malt dextrin, 1%-3% of egg yolk lecithin, and the balance of purified water.

[0018] Further, in step S3, the amount of purified water used in the material dissolving process is 30%-50% of the total purified water.

[0019] Further, in step S3, the stirring and dissolving conditions are: stirring and dissolving at 40-55℃ for 1h, and the rotation speed is 200-400r / min.

[0020] Further, in step S4, the first high-speed shearing treatment conditions are: shearing rotation speed of 19000-24000r / min, and shearing time of 5-15min.

[0021] Further, in step S5, the second high-speed shearing treatment conditions are: shearing rotation speed of 10000-16000r / min, and shearing time of 10-25min.

[0022] Further, in step S6, the spray drying conditions are: the temperature of the feeding port is 165-195℃, and the temperature of the discharging port is 65-80℃.

[0023] In the second aspect, the application further provides a instant walnut protein powder, which is prepared by the above method, and the raw materials of the instant walnut protein powder include 10-20% walnut defatted powder, 5-15% malt dextrin, 1-3% egg yolk lecithin and the balance of purified water.

[0024] Preferably, the raw materials of the instant walnut protein powder include 10% walnut defatted powder, 5% malt dextrin, 1% egg yolk lecithin and 84% purified water; or the raw materials of the instant walnut protein powder include 20% walnut defatted powder, 10% malt dextrin, 3% egg yolk lecithin and 67% purified water; or the raw materials of the instant walnut protein powder include 15% walnut defatted powder, 15% malt dextrin, 2% egg yolk lecithin and 68% purified water.

[0025] Compared with the prior art, the application provides an instant walnut protein powder and a preparation method thereof, and has the following beneficial effects:

[0026] The preparation method of the instant walnut protein powder product provided by the application is a pure physical preparation method, which is safer and more environmentally friendly compared with the method using chemical drugs, the whole preparation process is mild, and the instant walnut protein powder can achieve good emulsification effect at normal temperature and pressure without the need of a high-pressure homogenizer, and the final product has delicate taste and good solubility and dispersibility.

[0027] The present application adopts twice high-speed shearing treatment, which is divided into two stages, the first stage is high-speed shearing of concentrated solution, and the second stage is shearing of dilute solution by continuously adding purified water. The shearing machine used in the present application adopts a fixed-rotor mechanism as a homogenizing head. In the first stage, under the high-speed driving (19000-24000 r / min) of the motor, the material moves at high speed in the gap between the rotor and the stator, forming strong hydraulic shearing and turbulent flow. The stronger the hydraulic shearing and turbulent flow, the stronger the comprehensive forces such as centrifugal force, extrusion and collision generated in the homogenization process of the material with larger concentration and smaller volume. Under the coordination of these stronger comprehensive forces, the material is fully broken and dispersed, achieving better emulsification effect. In this stage, the greater the concentration of the solution, the greater the extrusion and collision force, so as to achieve sufficient breaking and good emulsification effect. Therefore, part of the purified water is added first for high-speed shearing of the concentrated solution. In the second stage, the remaining purified water is continuously sheared at a speed of 10000-16000 r / min, mainly to adjust the concentration of the solution to an appropriate range based on the emulsification in the first stage, so as to form smaller particle size products by subsequent spray drying. Because the particle size formed by subsequent spray drying will be very large when the solution concentration is too high, which is not conducive to the rapid dispersion and dissolution of walnut protein powder products. The present application can make the product have higher dispersibility and higher solubility, and realize instant and long-term stable non-layering effect by twice high-speed shearing treatment under different conditions. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 Particle size determination diagram of instant walnut protein powder;

[0030] Figure 2 Scanning electron microscope diagram of instant walnut protein powder;

[0031] Figure 3 Water-soluble dispersion of instant walnut protein powder. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] The present application provides a kind of instant walnut protein powder, by weight percentage, raw materials include 10%~20% walnut defatted powder, 5%~15% malt dextrin, 1%~3% egg yolk lecithin and the balance of purified water.

[0034] The preparation method of the instant walnut protein powder includes the following steps:

[0035] S1, preparation of walnut defatted powder: walnut kernel powder is crushed, and supercritical CO2 extraction technology is used for defatting to obtain walnut defatted powder; wherein the supercritical CO2 extraction defatting conditions are: extraction pressure is 30~50MPa, extraction temperature is 35~55℃, primary separation pressure is 6~10MPa, and separation temperature is 40~50℃.

[0036] S2, raw material weighing: walnut defatted powder, malt dextrin, egg yolk lecithin and purified water are weighed according to the above ratio.

[0037] S3, material dissolution: 30%~50% purified water is added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirred and dissolved at 40℃~55℃ for 1h, with a rotation speed of 200~400r / min.

[0038] S4, high-speed shearing of concentrated solution: after stirring and mixing, the first high-speed shearing treatment is carried out by a normal pressure shearing machine, with a shearing speed of 19000~24000r / min and a shearing time of 5~15min.

[0039] S5, high-speed shearing of dilute solution: then the remaining purified water is added to the emulsified concentrated solution, and the second high-speed shearing treatment is carried out, with a shearing speed of 10000~16000r / min and a shearing time of 10~25min.

[0040] S6, spray drying: the solution after the second high-speed shearing is subjected to spray drying, with an inlet temperature of 165~195℃ and an outlet temperature of 65~80℃, and the obtained powder is the instant walnut protein powder product.

[0041] The present application will be described in further detail below through detailed embodiments and in conjunction with the drawings.

[0042] Example 1

[0043] The embodiment provides a kind of instant walnut protein powder, according to percentage by weight, raw material includes 10% walnut defatted powder, 5% malt dextrin, 1% egg yolk lecithin and 84% purified water.

[0044] The preparation method of the instant walnut protein powder includes the following steps:

[0045] S1, preparation of walnut defatted powder: walnut kernel powder is crushed, and supercritical CO2 extraction technology is used for defatting, the extraction pressure is 35MPa, the extraction temperature is 35 DEG C, the primary separation pressure is 8MPa, and the separation temperature is 40 DEG C, to obtain walnut defatted powder.

[0046] S2, raw material weighing: according to the above ratio, walnut defatted powder 30g, malt dextrin 15g, egg yolk lecithin 3g and purified water 252g are weighed in turn, and a total of 300g of raw material.

[0047] S3, material dissolution: 76g of purified water is added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirring is carried out at 50 DEG C for 1h, and the rotating speed is 200r / min.

[0048] S4, high-speed shearing of concentrated solution: after stirring and mixing, the first high-speed shearing treatment is carried out by a normal pressure shearing machine, the shearing rotating speed is 19000r / min, and the shearing time is 5min.

[0049] S5, high-speed shearing of dilute solution: then 176g of purified water is added to the emulsified concentrated solution, the second high-speed shearing treatment is carried out, the shearing rotating speed is 10000r / min, and the shearing time is 10min.

[0050] S6, spray drying powder: the solution after the second high-speed shearing is subjected to spray drying, the temperature of the feeding port of the spray drying machine is 180 DEG C, the temperature of the discharging port is 75 DEG C, and the obtained powder is the instant walnut protein powder product. The content of protein in the instant walnut protein powder is 50%, the average particle size is 8 μm, the particle size determination is as shown in Figure 1 , and the electron microscope scanning diagram is as shown in Figure 2 , as shown in Figure 3 , it is prepared into aqueous solution by infusion, and whether there is delamination phenomenon is continuously observed and recorded after a period of time. The specific dispersion condition is recorded as shown in Table 1.

[0051] Example 2

[0052] The embodiment provides a kind of instant walnut protein powder, according to percentage by weight, raw material includes 20% walnut defatted powder, 10% malt dextrin, 3% egg yolk lecithin and 67% purified water.

[0053] The preparation method of the instant walnut protein powder includes the following steps:

[0054] S1, preparation of walnut defatted powder: walnut kernel powder is crushed, and supercritical CO2 extraction technology is used for defatting, the extraction pressure is 45 MPa, the extraction temperature is 40℃, the first separation pressure is 6 MPa, and the separation temperature is 50℃, and the walnut defatted powder is obtained.

[0055] S2, raw material weighing: according to the above ratio, walnut defatted powder 60g, malt dextrin 30g, egg yolk lecithin 9g and purified water 201g are weighed in turn, and the total amount of raw material is 300g.

[0056] S3, material dissolution: 100g of purified water is added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirred and dissolved at 40℃ for 1h, and the rotating speed is 300r / min.

[0057] S4, high-speed shearing of concentrated solution: after stirring and mixing, the first high-speed shearing treatment is carried out by using a normal pressure shearing machine, the shearing rotating speed is 24000r / min, and the shearing time is 15min.

[0058] S5, high-speed shearing of dilute solution: then 101g of purified water is added to the emulsified concentrated solution, the second high-speed shearing treatment is carried out, the shearing rotating speed is 16000r / min, and the shearing time is 25min.

[0059] S6, spray drying to powder: the solution after the second high-speed shearing is subjected to spray drying, the temperature of the feeding port of the spray drying machine is 195℃, the temperature of the discharging port is 80℃, and the obtained powder is the instant walnut protein powder product. The content of protein in the instant walnut protein powder is 55%, the average particle size is 10μm, the particle size determination is similar Figure 1 , the scanning electron microscope image is similar Figure 2 . Reference Figure 3 , and a water solution is prepared by diluting it, and whether there is a stratification phenomenon is observed and recorded for a period of time. The specific dispersion condition is shown in Table 1.

[0060] Example 3

[0061] The instant walnut protein powder provided in this example includes 15% of walnut defatted powder, 15% of malt dextrin, 2% of egg yolk lecithin and 68% of purified water by weight percentage.

[0062] The preparation method of the instant walnut protein powder includes the following steps:

[0063] S1, preparation of walnut defatted powder: walnut kernel powder is crushed, and supercritical CO2 extraction technology is used for defatting, the extraction pressure is 55 MPa, the extraction temperature is 55℃, the first separation pressure is 10 MPa, and the separation temperature is 45℃, and the walnut defatted powder is obtained.

[0064] S2, raw material weighing: according to the above ratio, walnut defatted powder 45g, malt dextrin 45g, egg yolk lecithin 6g and purified water 204g were weighed in turn, a total of 300g of raw materials.

[0065] S3, material dissolution: 82g of purified water was added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirred and dissolved at 40°C for 1h, with a rotation speed of 300r / min.

[0066] S4, high-speed shearing of concentrated solution: after stirring and mixing, the first high-speed shearing treatment was carried out by a normal pressure shearing machine, with a shearing speed of 20000r / min and a shearing time of 10min.

[0067] S5, high-speed shearing of dilute solution: then 122g of purified water was added to the emulsified concentrated solution, and the second high-speed shearing treatment was carried out, with a shearing speed of 12000r / min and a shearing time of 20min.

[0068] S6, spray drying to powder: the solution after the second high-speed shearing was subjected to spray drying, the temperature of the feed inlet of the spray dryer was 170℃, and the temperature of the discharge outlet was 65℃, and the obtained powder was the instant walnut protein powder product. The content of protein in the instant walnut protein powder was 60%, the average particle size was 12μm, and the particle size determination was similar Figure 1 , the scanning electron microscope image was similar Figure 2 . Reference Figure 3 , and placed for a period of time to continuously observe and record whether there was a stratification phenomenon. The specific dispersion conditions are shown in Table 1.

[0069] Comparative Example 1

[0070] This comparative example is compared with Example 1, and the purified water is added at one time and only one high-speed shearing treatment is carried out, and the other conditions are the same.

[0071] Specifically, the comparative example provides an instant walnut protein powder, by weight percentage, the raw materials include 10% of walnut defatted powder, 5% of malt dextrin, 1% of egg yolk lecithin and 84% of purified water.

[0072] The preparation method of the instant walnut protein powder comprises the following steps:

[0073] S1, preparation of walnut defatted powder: walnut kernel powder was crushed, and supercritical CO2 extraction technology was used for defatting, with an extraction pressure of 35MPa and an extraction temperature of 35℃, a primary separation pressure of 8MPa and a separation temperature of 40℃, to obtain walnut defatted powder.

[0074] S2, raw material taking: according to the above-mentioned proportion, walnut defatted powder 30g, malt dextrin 15g, egg yolk lecithin 3g and purified water 252g were weighed in turn, and the total amount of raw material was 300g.

[0075] S3, material dissolution and shearing treatment: 252g of purified water was added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirred and dissolved at 50℃ for 1h, the rotation speed was 200r / min; after stirring and mixing, a high-speed shearing treatment was carried out once by a normal pressure shearing machine, the shearing rotation speed was 15000r / min, and the shearing time was 5min.

[0076] S4, spray drying: the solution after high-speed shearing was subjected to spray drying, the temperature of the feeding port of the spray drying machine was 180℃, the temperature of the discharging port was 75℃, and the obtained powder was the instant walnut protein powder product. The content of protein in the instant walnut protein powder was 52%, and the average particle size was 38μm. Figure 3 The prepared instant walnut protein powder was used to prepare an aqueous solution, and the aqueous solution was placed for a period of time for continuous observation and recording of whether there was a phenomenon of stratification. The specific dispersion condition is shown in Table 1.

[0077] Comparative Example 2

[0078] This comparative example was compared with Example 2, and the purified water was added at one time and only one low-speed shearing treatment was carried out, and the other conditions were the same.

[0079] Specifically, the comparative example provided an instant walnut protein powder, and the raw materials included 20% of walnut defatted powder, 10% of malt dextrin, 3% of egg yolk lecithin and 67% of purified water.

[0080] The preparation method of the instant walnut protein powder included the following steps:

[0081] S1, preparation of walnut defatted powder: walnut kernel powder was crushed, and supercritical CO2 extraction technology was used for defatting, the extraction pressure was 45MPa, the extraction temperature was 40℃, the primary separation pressure was 6MPa, and the separation temperature was 50℃, and the walnut defatted powder was obtained.

[0082] S2, raw material taking: according to the above-mentioned proportion, walnut defatted powder 30g, malt dextrin 15g, egg yolk lecithin 3g and purified water 252g were weighed in turn, and the total amount of raw material was 300g.

[0083] S3, material dissolution and shearing treatment: 252g of purified water was added to the walnut defatted powder, malt dextrin and egg yolk lecithin, and stirred and dissolved at 50℃ for 1h, the rotation speed was 200r / min; after stirring and mixing, a high-speed shearing treatment was carried out once by a normal pressure shearing machine, the shearing rotation speed was 15000r / min, and the shearing time was 5min.

[0084] S4, spray drying: the solution after low speed shearing is spray dried, the temperature of the inlet of the spray dryer is 195℃, the temperature of the outlet is 80℃, the obtained powder is the instant walnut protein powder product. The content of protein in the instant walnut protein powder is 54%, the average particle size is 53μm. Figure 3 The prepared water solution is observed and recorded for whether there is stratification phenomenon after a period of time. The dispersion is recorded as shown in Table 1.

[0085] Table 1. Dispersion of the prepared water solution of the products of the examples and the comparative examples

[0086] Time (h) 1 2 4 6 8 Example 1 solution layering No layering No layering No layering No layering No layering Example 2 solution layering No layering No layering No layering No layering No layering Example 3 solution layering No layering No layering No layering No layering No layering Comparative Example 1 solution layering No layering No layering Layered Layered Layered Comparative Example 2 solution layering Layered Layered Layered Layered Layered

[0087] Table 2. Average particle size of the products of the examples and the comparative examples

[0088] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Particle size (μm) 8 μm 10 μm 12 μm 38 μm 53 μm

[0089] From the dispersion of Table 1 and the average particle size distribution of Table 2, it can be seen that the prepared water solution of the products of Examples 1-3 is not easy to stratify after standing, and the average particle size of the products is small (8μm-12μm); while the prepared water solution of the products of Comparative Examples 1-2 is easy to stratify after standing, and the average particle size of the products is large (38μm-53μm). It can be seen that, by adopting the specific and relatively simple process conditions and operations, the average particle size of the obtained products is small, the products have good solubility and dispersibility, and the products are not easy to stratify after dissolution and are relatively stable.

[0090] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0091] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and the skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be combined to form other embodiments which can be understood by the skilled person.

Claims

1. A method of preparing an instant walnut protein powder, characterized by, The method comprises the following steps: S1, preparation of walnut defatted powder: walnut kernel powder is crushed, and supercritical CO2 extraction technology is used for defatting to obtain walnut defatted powder; S2, weighing of raw materials: walnut defatted powder, malt dextrin, egg yolk lecithin and purified water are weighed according to a certain ratio; S3, dissolution of materials: 30%-50% of the total amount of purified water is added to the walnut defatted powder, malt dextrin and egg yolk lecithin for stirring and dissolution; S4, high-speed shearing of concentrated solution: after stirring and mixing, the first high-speed shearing treatment is performed by a normal-pressure shearing machine, the shearing speed is 19000-24000 r / min, and the shearing time is 5-15 min; S5, high-speed shearing of dilute solution: then the remaining purified water is added to the emulsified concentrated solution for the second high-speed shearing treatment, the shearing speed is 10000-16000 r / min, and the shearing time is 10-25 min; S6, spray drying to obtain powder: the solution after the second high-speed shearing is subjected to spray drying, and an instant walnut protein powder product is obtained.

2. The production method according to claim 1, characterized by, In step S1, the supercritical CO2 extraction defatting conditions are as follows: the extraction pressure is 30-55 MPa, the extraction temperature is 35-55℃, the primary separation pressure is 6-10 MPa, and the separation temperature is 40-50℃.

3. The preparation method according to claim 1, characterized in that, In step S2, by weight percentage, the raw materials of the instant walnut protein powder include 10%-20% of walnut defatted powder, 5%-15% of malt dextrin, 1%-3% of egg yolk lecithin and the balance of purified water.

4. The production method according to claim 1, characterized by, In step S3, the stirring and dissolution conditions are as follows: stirring and dissolution are performed at 40℃-55℃ for 1 h, and the rotating speed is 200-400 r / min.

5. The method of claim 1, wherein, In step S6, the spray drying conditions are as follows: the temperature of the feeding port is 165-195℃, and the temperature of the discharging port is 65-80℃.

6. A ready-to-solubilize walnut protein powder, characterized in that, The instant walnut protein powder prepared by the method of claim 1 has a raw material composition by weight percentage of 10%-20% of walnut defatted powder, 5%-15% of malt dextrin, 1%-3% of egg yolk lecithin and the balance of purified water.

7. The instant soluble walnut protein powder according to claim 6, characterized in that, The raw material composition of the instant walnut protein powder by weight percentage includes 10% of walnut defatted powder, 5% of malt dextrin, 1% of egg yolk lecithin and 84% of purified water; or the raw material composition of the instant walnut protein powder includes 20% of walnut defatted powder, 10% of malt dextrin, 3% of egg yolk lecithin and 67% of purified water; or the raw material composition of the instant walnut protein powder includes 15% of walnut defatted powder, 15% of malt dextrin, 2% of egg yolk lecithin and 68% of purified water.

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