Zanthoxylum bungeanum leaf-based membrane material, and preparation method and application thereof

Abstract

This invention provides a Sichuan pepper leaf-based film material, its preparation method, and its application, belonging to the field of packaging film technology. The process includes the following steps: (1) mixing Sichuan pepper leaf powder with water and homogenizing to obtain a Sichuan pepper leaf powder slurry; (2) mixing the Sichuan pepper leaf powder slurry obtained in step (1) with a thickener and a plasticizer and homogenizing at high speed to obtain a film-forming slurry; (3) forming a film from the film-forming slurry obtained in step (2) to obtain a Sichuan pepper leaf-based packaging film. This invention directly uses Sichuan pepper leaf powder to prepare the packaging film, eliminating the need for active ingredient extraction, thus simplifying the preparation process. The addition of thickener and plasticizer interacts with the macromolecular components in the Sichuan pepper leaf powder, forming hydrogen bonds, resulting in a packaging film with excellent mechanical and barrier properties.

Description

Technical Field

[0001] This invention relates to the field of packaging film technology, and in particular to a pepper leaf-based film material, its preparation method, and its application. Background Technology

[0002] my country boasts the world's largest cultivation area, highest yield, and most diverse varieties of Sichuan pepper. During the processing of Sichuan pepper into food spices, its leaves are a major byproduct. Due to a lack of effective utilization methods, large quantities of Sichuan pepper leaves are landfilled or incinerated, causing economic losses and environmental pollution. Sichuan pepper leaves are rich in flavonoids, polyphenols, cellulose, proteins, natural pigments, and other functional substances, making them a plant resource with potential edible and medicinal value. To increase the efficiency of the Sichuan pepper industry, in-depth research on the utilization of this byproduct is urgently needed. Currently, most researchers focus on the isolation and extraction of functional components from Sichuan pepper leaves, such as dietary fiber, flavonoids, active polysaccharides, and polyphenolic phytochemicals. However, this approach is costly, complex, and results in low extraction rates of active ingredients, with the residue remaining difficult to treat. Therefore, the efficient and comprehensive utilization of Sichuan pepper leaves through recycling holds significant potential for both economic benefits and environmental protection.

[0003] Traditional packaging materials are generally plastics, but due to their high chemical stability and extremely low biodegradability, traditional plastic packaging causes serious environmental pollution. Furthermore, the potential for toxic monomer residues and chemical additive migration within the plastic packaging itself can pose food safety risks. With the increasing demand for healthy and safe food and growing environmental awareness, developing green, environmentally friendly, bioactive, and biodegradable packaging materials has become a new direction for the development of novel food packaging.

[0004] To address these issues, current research suggests using plant-derived food byproducts to prepare biodegradable bioactive packaging films: certain active components are extracted from the plant-derived food byproducts and then chemically cross-linked with other components. However, films prepared using existing methods exhibit poor mechanical strength and barrier properties, resulting in low practical value.

[0005] Therefore, improving the mechanical and barrier properties of biodegradable bioactive membrane materials prepared from plant-derived food by-products has become a challenge for existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a pepper leaf-based membrane material, its preparation method, and its applications. The membrane material prepared by the method provided by this invention exhibits excellent mechanical and barrier properties.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] This invention provides a method for preparing a pepper leaf-based membrane material, comprising the following steps:

[0009] (1) Mix Sichuan pepper leaf powder with water and homogenize to obtain Sichuan pepper leaf powder slurry;

[0010] (2) The pepper leaf powder slurry obtained in step (1) is mixed with thickener and plasticizer and subjected to high-speed homogenization to obtain film-forming slurry;

[0011] (3) The film-forming slurry obtained in step (2) is used to form a film to obtain pepper leaf base film material.

[0012] Preferably, the Sichuan pepper leaf powder in step (1) has a mesh size of ≥200 mesh.

[0013] Preferably, the mass concentration of the Sichuan pepper leaf powder slurry in step (1) is 0.5-2.5%.

[0014] Preferably, the thickener in step (2) includes one or more of sodium alginate, pectin and chitosan.

[0015] Preferably, in step (2), the mass ratio of thickener to pepper leaf powder slurry is (0.3-0.7):100.

[0016] Preferably, the plasticizer in step (2) includes one or more of glycerol, sorbitol and propylene glycol.

[0017] Preferably, in step (2), the mass ratio of plasticizer to pepper leaf powder slurry is (0.4-0.8):100.

[0018] Preferably, the high-speed homogenization rate in step (2) is 13,000 to 15,000 rpm, and the high-speed homogenization time is 5 to 10 min.

[0019] This invention provides a pepper leaf-based membrane material prepared by the preparation method described in the above technical solution.

[0020] The present invention also provides the application of the pepper leaf base film material described in the above technical solution as a packaging material.

[0021] This invention provides a method for preparing a Sichuan pepper leaf-based membrane material, comprising the following steps: (1) mixing Sichuan pepper leaf powder with water and homogenizing to obtain a Sichuan pepper leaf powder slurry; (2) mixing the Sichuan pepper leaf powder slurry obtained in step (1) with a thickener and a plasticizer and homogenizing at high speed to obtain a film-forming slurry; (3) forming a film with the film-forming slurry obtained in step (2) to obtain the Sichuan pepper leaf-based membrane material. This invention directly uses Sichuan pepper leaf powder to prepare the membrane material, eliminating the need for active ingredient extraction, thus simplifying the preparation process. The addition of thickener and plasticizer interacts with the macromolecular components such as cellulose and protein in the Sichuan pepper leaf powder, forming hydrogen bonds, resulting in a membrane material with excellent mechanical and barrier properties. The results of the examples show that the tensile strength of the membrane material prepared by this invention can reach 11.56 MPa, the elongation at break can reach 38.49%, and the water vapor permeability coefficient is 0.77 × 10⁻⁶. -10 g·m / m 2 At ·s·Pa or higher, the DPPH free radical scavenging rate is above 50%, and the ABTS free radical scavenging rate is above 20%. Attached Figure Description

[0022] Figure 1 This is a photograph of the pepper leaf-based membrane material prepared in Example 1 of the present invention.

[0023] Figure 2 The tensile strength and elongation at break of the membrane materials in Examples 1-5 of this invention;

[0024] Figure 3 The tensile strength and elongation at break of the membrane materials in Examples 3, 6-9 of this invention;

[0025] Figure 4 The tensile strength and elongation at break of the membrane materials in Examples 3, 14-17 of this invention;

[0026] Figure 5 The infrared spectra of the film materials in Example 3 and Comparative Example 1 of this invention are shown. Detailed Implementation

[0027] This invention provides a method for preparing a pepper leaf-based membrane material, comprising the following steps:

[0028] (1) Mix Sichuan pepper leaf powder with water and homogenize to obtain Sichuan pepper leaf powder slurry;

[0029] (2) The pepper leaf powder slurry obtained in step (1) is mixed with thickener and plasticizer and subjected to high-speed homogenization to obtain film-forming slurry;

[0030] (3) The film-forming slurry obtained in step (2) is used to form a film to obtain pepper leaf base film material.

[0031] Unless otherwise specified, the present invention does not have any special limitations on the source of the raw materials, and commercially available products well known to those skilled in the art can be used.

[0032] This invention involves mixing Sichuan pepper leaf powder with water and homogenizing the mixture to obtain a Sichuan pepper leaf powder slurry.

[0033] In this invention, the mesh size of the Sichuan pepper leaf powder is preferably ≥200 mesh. By limiting the mesh size of the Sichuan pepper leaf powder to the above range, this invention enables it to be more fully dispersed in the slurry, thereby obtaining a membrane material with a more uniform distribution, a smoother surface, and further improving the various properties of the membrane material.

[0034] In this invention, the Sichuan pepper leaf powder is preferably obtained by crushing Sichuan pepper leaves and then sieving them.

[0035] In this invention, the Sichuan pepper leaves are preferably freshly picked. Using freshly picked Sichuan pepper leaves ensures that they contain a higher content of active substances, thereby improving the antioxidant properties of the membrane material.

[0036] In this invention, the pepper leaves are preferably rinsed and dried sequentially before being crushed.

[0037] In this invention, the rinsing is preferably performed sequentially using tap water and distilled water. In this invention, the rinsing is used to remove impurities and contaminants from the surface of the pepper leaves.

[0038] In this invention, the drying temperature is preferably 40-50°C, more preferably 45°C; the drying time is preferably 1-3 hours, more preferably 2 hours.

[0039] In this invention, the pressure of the homogenization treatment is preferably 0-60 MPa, more preferably 20-50 MPa, and most preferably 30-40 MPa; the number of homogenization treatments is preferably 1-15 times, more preferably 5-10 times. By limiting the pressure and number of homogenization treatments within the above ranges, this invention enables the Sichuan pepper leaf powder to be more fully dispersed in water.

[0040] In this invention, the mass concentration of the Sichuan pepper leaf powder slurry is preferably 0.5-2.5%, more preferably 1-2%. By limiting the mass concentration of the Sichuan pepper leaf powder slurry within the above range, this invention enables the Sichuan pepper leaf powder to be dispersed more fully, and the slurry contains a large amount of Sichuan pepper leaf powder, which improves the various properties of the film material after film formation.

[0041] After obtaining the pepper leaf powder slurry, the present invention mixes the pepper leaf powder slurry with a thickener and a plasticizer and performs high-speed homogenization to obtain a film-forming slurry.

[0042] In this invention, the thickener preferably includes one or more of sodium alginate, pectin, and chitosan; the mass ratio of the thickener to the Sichuan pepper leaf powder slurry is preferably (0.3-0.7):100, more preferably (0.4-0.5):100. In this invention, the macromolecular components such as cellulose and protein in the Sichuan pepper leaf powder can interact with the thickener through surface hydroxyl groups to form hydrogen bonds, thereby improving the mechanical properties of the membrane material. By limiting the type and amount of thickener within the above-mentioned range, this invention can form more hydrogen bonds, further improving the mechanical properties of the membrane material.

[0043] In this invention, the plasticizer preferably includes one or more of glycerol, sorbitol, and propylene glycol; the mass ratio of the plasticizer to the Sichuan pepper leaf powder slurry is preferably (0.4-0.8):100, more preferably (0.5-0.7):100. In this invention, the macromolecular components such as cellulose and protein in the Sichuan pepper leaf powder can interact with the plasticizer through surface hydroxyl groups to form hydrogen bonds, thereby improving the mechanical properties of the membrane material. By limiting the type and amount of plasticizer within the above-mentioned range, this invention can form more hydrogen bonds, further improving the mechanical properties of the membrane material.

[0044] In this invention, the mixing temperature is preferably 40–60°C, more preferably 50°C; the mixing time is preferably 1–3 hours, more preferably 2 hours; and the mixing is preferably carried out under stirring conditions. By limiting the mixing temperature and time to the above ranges, this invention enables more thorough mixing of the components.

[0045] In this invention, the speed of the high-speed homogenization process is preferably 13,000–15,000 rpm, more preferably 14,000–15,000 rpm; the time of the high-speed homogenization process is preferably 5–10 min, more preferably 8–10 min. By limiting the speed and time of the high-speed homogenization process to the above ranges, this invention enables the components to be dispersed more fully and uniformly.

[0046] In this invention, after the high-speed homogenization process is completed, the product of the high-speed homogenization process is preferably subjected to vacuum degassing and settling in sequence.

[0047] In this invention, the vacuum degree of the vacuum degassing treatment is not lower than -0.095 MPa; the vacuum degassing treatment time is preferably 30 to 40 minutes.

[0048] In this invention, the settling time is preferably 5 to 15 minutes, more preferably 10 minutes.

[0049] This invention limits the parameters of vacuum degassing and settling to the above range, which can remove air bubbles in the slurry more completely and avoid adverse effects on the membrane material.

[0050] After obtaining the film-forming slurry, the present invention forms a film from the film-forming slurry to obtain a pepper leaf-based film material.

[0051] In this invention, the film formation preferably includes sequential casting and drying.

[0052] The present invention does not impose any special limitations on the operation of the casting process; any casting operation known to those skilled in the art can be used.

[0053] In this invention, the drying temperature is preferably 40-60°C, more preferably 50°C; the drying time is preferably 6-8 hours.

[0054] This invention provides a pepper leaf-based membrane material prepared by the preparation method described in the above technical solution.

[0055] The pepper leaf-based membrane material provided by this invention has higher mechanical and barrier properties.

[0056] The present invention also provides the application of the pepper leaf base film material described in the above technical solution as a packaging material.

[0057] The present invention does not impose any special limitations on the application of the pepper leaf-based film material as a packaging material; any technical solution for using film materials as packaging materials that is well known to those skilled in the art can be adopted.

[0058] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] Example 1

[0060] (1) Freshly picked pepper leaves were rinsed with tap water and distilled water in turn, dried at 45℃ for 2 hours, and then crushed and passed through a 200-mesh sieve to obtain pepper leaf powder.

[0061] (2) Mix the pepper leaf powder with distilled water and homogenize it 10 times under a pressure of 30 MPa using a high-pressure homogenizer to obtain pepper leaf powder slurry with a mass concentration of 0.5%.

[0062] (3) The pepper leaf powder slurry was stirred at 50°C for 2 hours with sodium alginate and glycerol (the mass ratio of sodium alginate to pepper leaf powder slurry was 0.5:100 and the mass ratio of glycerol to pepper leaf powder slurry was 0.6:100). The mixture was then homogenized at a homogenization rate of 13000 rpm for 10 minutes, degassed under vacuum at -0.095 MPa for 35 minutes, and allowed to stand for 10 minutes to obtain the film-forming slurry.

[0063] (4) 200 mL of film-forming slurry was cast onto a dry and clean plastic plate using a casting method to form a film with a thickness of 0.3 cm. The film was then placed in an oven at 50°C for 6 hours and cooled before peeling off to obtain the pepper leaf base film material.

[0064] Example 2

[0065] Replace the mass concentration of the pepper leaf powder slurry in step (2) of Example 1 with 1.0%, and keep all other parameters the same as in Example 1.

[0066] Example 3

[0067] Replace the mass concentration of the pepper leaf powder slurry in step (2) of Example 1 with 1.5%, and keep all other parameters the same as in Example 1.

[0068] Example 4

[0069] Replace the mass concentration of the pepper leaf powder slurry in step (2) of Example 1 with 2.0%, and keep all other parameters the same as in Example 1.

[0070] Example 5

[0071] Replace the mass concentration of the pepper leaf powder slurry in step (2) of Example 1 with 2.5%, and keep all other parameters the same as in Example 1.

[0072] Example 6

[0073] (1) Freshly picked pepper leaves were rinsed with tap water and distilled water in turn, dried at 45℃ for 2 hours, and then crushed and passed through a 200-mesh sieve to obtain pepper leaf powder.

[0074] (2) Mix the pepper leaf powder with distilled water and homogenize it 10 times under a pressure of 30 MPa using a high-pressure homogenizer to obtain pepper leaf powder slurry with a mass concentration of 1.5%.

[0075] (3) The pepper leaf powder slurry was stirred at 50°C for 2 hours with sodium alginate and glycerol (the mass ratio of sodium alginate to pepper leaf powder slurry was 0.5:100 and the mass ratio of glycerol to pepper leaf powder slurry was 0.4:100). The mixture was then homogenized at a homogenization rate of 13000 rpm for 10 minutes, degassed under vacuum at -0.095 MPa for 35 minutes, and allowed to stand for 10 minutes to obtain the film-forming slurry.

[0076] (4) 200 mL of film-forming slurry was cast onto a dry and clean plastic plate using a casting method to form a film with a thickness of 0.3 cm. The film was then placed in an oven at 50°C for 6 hours and cooled before peeling off to obtain the pepper leaf base film material.

[0077] Example 7

[0078] The mass ratio of glycerol to pepper leaf powder slurry in step (3) of Example 6 was 0.5:100, and all other parameters were the same as in Example 6.

[0079] Example 8

[0080] The mass ratio of glycerol to pepper leaf powder slurry in step (3) of Example 6 was 0.7:100, and all other parameters were the same as in Example 6.

[0081] Example 9

[0082] The mass ratio of glycerol to pepper leaf powder slurry in step (3) of Example 6 was 0.8:100, and all other parameters were the same as in Example 6.

[0083] Example 10

[0084] (1) Freshly picked pepper leaves were rinsed with tap water and distilled water in turn, dried at 45℃ for 2 hours, and then crushed and passed through a 200-mesh sieve to obtain pepper leaf powder.

[0085] (2) Mix the pepper leaf powder with distilled water and homogenize it 10 times under a pressure of 30 MPa using a high-pressure homogenizer to obtain pepper leaf powder slurry with a mass concentration of 1.5%.

[0086] (3) The pepper leaf powder slurry was mixed with sodium alginate and glycerol (the mass ratio of sodium alginate to pepper leaf powder slurry was 0.3:100, and the mass ratio of glycerol to pepper leaf powder slurry was 0.6:100) at 50℃ for 2 hours, homogenized at a homogenization rate of 13000 rpm for 10 minutes, degassed under vacuum at -0.095 MPa for 35 minutes, and then allowed to stand for 10 minutes to obtain the film-forming slurry.

[0087] (4) 200 mL of film-forming slurry was cast onto a dry and clean plastic plate using a casting method to form a film with a thickness of 0.3 cm. The film was then placed in an oven at 50°C for 6 hours and cooled before peeling off to obtain the pepper leaf base film material.

[0088] Example 11

[0089] The mass ratio of sodium alginate and Sichuan pepper leaf powder slurry in step (3) of Example 10 was 0.4:100, and all other parameters were the same as in Example 10.

[0090] Example 12

[0091] The mass ratio of sodium alginate and Sichuan pepper leaf powder slurry in step (3) of Example 10 was 0.6:100, and all other parameters were the same as in Example 10.

[0092] Example 13

[0093] The mass ratio of sodium alginate and Sichuan pepper leaf powder slurry in step (3) of Example 10 was 0.7:100, and all other parameters were the same as in Example 10.

[0094] Example 14

[0095] (1) Freshly picked pepper leaves were rinsed with tap water and distilled water in turn, dried at 45℃ for 2 hours, and then crushed and passed through a 200-mesh sieve to obtain pepper leaf powder.

[0096] (2) Mix the pepper leaf powder with distilled water and homogenize it 10 times under a pressure of 15 MPa using a high-pressure homogenizer to obtain pepper leaf powder slurry with a mass concentration of 1.5%.

[0097] (3) The pepper leaf powder slurry was stirred at 50°C for 2 hours with sodium alginate and glycerol (the mass ratio of sodium alginate to pepper leaf powder slurry was 0.5:100 and the mass ratio of glycerol to pepper leaf powder slurry was 0.6:100). The mixture was then homogenized at a homogenization rate of 13000 rpm for 10 minutes, degassed under vacuum at -0.095 MPa for 35 minutes, and allowed to stand for 10 minutes to obtain the film-forming slurry.

[0098] (4) 200 mL of film-forming slurry was cast onto a dry and clean plastic plate using a casting method to form a film with a thickness of 0.3 cm. The film was then placed in an oven at 50°C for 6 hours and cooled before peeling off to obtain the pepper leaf base film material.

[0099] Example 15

[0100] Replace the high-pressure homogenization pressure in step (2) of Example 14 with 45 MPa, and keep all other parameters the same as in Example 14.

[0101] Example 16

[0102] Replace the high-pressure homogenization pressure in step (2) of Example 14 with 60 MPa, and keep all other parameters the same as in Example 14.

[0103] Example 17

[0104] Replace the high-pressure homogenization pressure in step (2) of Example 14 with 0 MPa, and keep all other parameters the same as in Example 14.

[0105] Comparative Example 1

[0106] Replace the mass concentration of the pepper leaf powder slurry in step (2) of Example 1 with 0%, that is, do not add pepper leaf powder, and keep all other parameters the same as in Example 1.

[0107] A physical image of the pepper leaf-based membrane material prepared in Example 1 is shown below. Figure 1 As shown.

[0108] The tensile strength and elongation at break of the membrane materials in Examples 1-5 were determined according to GB / T1040.3-2006, and the results are as follows: Figure 2 As shown. From Figure 2 It can be seen that as the mass concentration of Sichuan pepper leaf powder slurry increases, the tensile strength and elongation at break of the membrane material first increase and then decrease, reaching the maximum value when the mass concentration of Sichuan pepper leaf powder slurry is 1.5%.

[0109] The tensile strength and elongation at break of the membrane materials in Examples 3, 6-9 were determined according to GB / T1040.3-2006, and the results are as follows: Figure 3 As shown. From Figure 3 As can be seen, the tensile strength of the membrane material first increases and then decreases with the increase of glycerol content, reaching its maximum value when the mass ratio of glycerol to pepper leaf powder slurry is 0.6:100. With the increase of glycerol content, the elongation at break of the membrane material gradually increases.

[0110] The tensile strength and elongation at break of the membrane materials in Examples 3, 14-17 were determined according to GB / T1040.3-2006, and the results are as follows: Figure 4 As shown. From Figure 4 As can be seen, with the increase of high-pressure homogenization pressure, the tensile strength and elongation at break of the membrane material first increase and then decrease, reaching their maximum values ​​when the high-pressure homogenization pressure is 30 MPa.

[0111] The infrared spectra of the film materials in Example 3 and Comparative Example 1 are as follows: Figure 5 As shown. From Figure 5 As can be seen from the results, compared to the membrane material without added Sichuan pepper leaf powder, no new peaks were observed in the infrared spectrum of the membrane material with added Sichuan pepper leaf powder in Example 3. This indicates that no chemical reaction occurred between the sodium alginate, glycerol components, and Sichuan pepper leaf powder, and the peaks were located at 3268–3260 cm⁻¹. -1 The peak showed a significant decrease and a slight red shift trend. This is because the main macromolecular components in Sichuan pepper leaf powder, such as cellulose and protein, can interact with sodium alginate through surface hydroxyl groups to form hydrogen bonds.

[0112] The light transmittance of the membrane materials in Examples 3 and 16-17 was determined according to GB / T1040.3-2006. The tensile strength and elongation at break of the membrane materials in Examples 3 and 16-17 were determined according to GB / T16928-1997. The water vapor transmission coefficient was determined according to GB / T1038-2000. The oxygen transmission rate was determined according to GB / T1038-2000. The results are listed in Table 1.

[0113] Table 1. Tensile strength, elongation at break, light transmittance, water vapor transmission coefficient, and oxygen transmission rate of the membrane materials in Examples 3, 16-17.

[0114]

[0115]

[0116] The antioxidant properties of the membrane materials prepared in Examples 3, 17, and 1 (Comparative Example 1) were determined, and the antioxidant properties were calculated based on DPPH and ABTS free radical scavenging rates. The results are shown in Table 2.

[0117] Table 2. DPPH and ABTS free radical scavenging rates of membrane materials from Examples 3, 17 and Comparative Example 1.

[0118]

[0119] As can be seen from Table 2, the membrane material prepared by this invention has higher antioxidant properties.

[0120] In summary, the membrane material prepared by this invention has better mechanical strength, barrier properties, and antioxidant properties.

[0121] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a pepper leaf-based membrane material, comprising the following steps: (1) Mix Sichuan pepper leaf powder with water and homogenize to obtain Sichuan pepper leaf powder slurry; the pressure of the homogenization process is 30 MPa; the Sichuan pepper leaf powder is obtained by crushing Sichuan pepper leaves and then sieving; the Sichuan pepper leaves are freshly picked Sichuan pepper leaves; the Sichuan pepper leaves are rinsed and dried in sequence before crushing; the rinsing is carried out by washing with tap water and distilled water in sequence; the drying temperature is 40-50℃; (2) The pepper leaf powder slurry obtained in step (1) is mixed with thickener and plasticizer and subjected to high-speed homogenization to obtain film-forming slurry; (3) The film-forming slurry obtained in step (2) is used to form a film to obtain a pepper leaf-based film material; The mass concentration of the Sichuan pepper leaf powder slurry in step (1) is 1.5%; the thickener in step (2) is sodium alginate; the mass ratio of the thickener to the Sichuan pepper leaf powder slurry in step (2) is 0.5:100; the plasticizer in step (2) is glycerol; the mass ratio of the plasticizer to the Sichuan pepper leaf powder slurry in step (2) is 0.6:

100.

2. The preparation method according to claim 1, characterized in that, In step (1), the particle size of the Sichuan pepper leaf powder is ≥200 mesh.

3. The preparation method according to claim 1, characterized in that, In step (2), the high-speed homogenization rate is 13,000 to 15,000 rpm, and the high-speed homogenization time is 5 to 10 minutes.

4. The pepper leaf-based membrane material prepared by the preparation method according to any one of claims 1 to 3.

5. The application of the pepper leaf-based film material according to claim 4 as a packaging material.

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