A glucose-cyclodextrin modified rosin glycerin plastic slow-release film and a preparation method thereof

Abstract

This invention discloses a glucose-cyclodextrin modified rosin glycerol plastic sustained-release film and its preparation method, belonging to the technical field of bio-based polymer sustained-release materials. Using corn starch as the base raw material, this invention prepares a mixed sugar solution rich in glucose and α-cyclodextrin through a specific enzymatic hydrolysis process combining α-amylase liquefaction with cyclodextrin glucosyltransferase cyclization, replacing traditional chemical polyol raw materials. The enzymatically hydrolyzed sugar solution is then concentrated and dehydrated, and then subjected to a high-temperature, reduced-pressure esterification and polycondensation reaction with rosin and glycerol. Utilizing the polyhydroxy structures of glucose and cyclodextrin to undergo esterification grafting with the carboxyl groups of rosin, combined with the cross-linking and plasticizing effect of glycerol, a bio-based polymer possessing plasticity, lipophilicity, and sustained-release properties is prepared. Finally, the sustained-release film material is obtained by casting. This invention addresses the technical shortcomings of traditional rosin film materials, such as high brittleness, strong hydrophilicity, poor sustained-release stability, and non-renewable raw materials. Through the synergistic modification effect of starch enzymatic hydrolysis products, the polymer cross-linked network structure is effectively optimized, endowing the film with excellent flexibility, plasticity, and hydrophobic-oleophilic properties. Simultaneously, relying on the cavity inclusion properties of cyclodextrin and the controllable degradation structure of sugar esters, the film possesses stable long-term sustained-release performance. The raw materials of this invention are green and renewable, the process is simple and controllable, and the production cost is low. The prepared sustained-release film exhibits excellent plasticity, good film-forming properties, and stable sustained-release cycle, and can be widely used in agricultural and forestry sustained-release adjuvants, drug sustained-release carriers, environmentally friendly packaging, biodegradable coatings, and other fields, possessing excellent prospects for industrial application.

Description

Technical Field

[0001] This invention relates to the field of insect pheromone slow-release carrier preparation technology, specifically to a glucose-cyclodextrin modified rosin glycerol plastic slow-release membrane and its preparation method. Background Technology

[0002] Insect pheromones, also known as insect pheromones, are chemical substances secreted by insects through glands to regulate or induce the behavior and responses of other individuals of the same species. Currently, the green control of crops or forests commonly uses artificially synthesized insect pheromones to attract and capture insects to achieve the purpose of control. However, how to ensure the long-term effectiveness of synthetic pheromones in the wild environment remains a challenge.

[0003] Because pheromones are expensive and volatile, their use is costly. Therefore, slow-release methods are necessary in practical applications. However, due to light exposure and the nature of the carrier, insect pheromones often undergo isomerization, leading to pheromone inactivation. Sex pheromones are volatile, easily photodegraded, and have short field persistence. Existing slow-release carriers (such as rubber stoppers and microcapsules) suffer from problems such as burst release and poor environmental adaptability. Therefore, developing efficient and environmentally friendly sex pheromone carriers for slow release in the field has become a research hotspot in this field.

[0004] In view of a series of shortcomings of sustained-release materials, this invention proposes a glucose-cyclodextrin modified rosin glycerol plastic sustained-release film and its preparation method. By enzymatic modification of corn starch coupled with rosin glycerol esterification and cross-linking technology, a supramolecular polymer system with strong self-assembly ability is constructed to achieve long-term controlled release of pheromone analogs, meeting the application requirements of long-term stable encapsulation and sustained release of insect pheromones. Summary of the Invention

[0005] The purpose of this invention is to provide a glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method.

[0006] A glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method include the following steps:

[0007] S1: Preparation of glucose-α-cyclodextrin complex sugar solution by segmented double enzymatic hydrolysis of corn starch

[0008] Corn starch and deionized water were mixed to form a homogeneous starch slurry. The starch crystal structure was destroyed by high-temperature gelatinization. The starch was then liquefied using a heat-resistant α-amylase to hydrolyze the long-chain macromolecules of starch into linear short-chain dextrins and a small amount of glucose. This process only reduced starch viscosity and degraded chain segments without generating cyclodextrins. After the enzyme was inactivated to terminate the liquefaction reaction, cyclodextrin glucosyltransferase (CGTase) was added, along with a directional complexing agent, to carry out an enzymatic cyclization reaction. This directionally closed the linear short-chain dextrins to generate α-cyclodextrins, ultimately producing a complex enzymatic hydrolysate solution rich in both glucose and α-cyclodextrins.

[0009] S2: Pretreatment for Concentration of Compound Sugar Solution

[0010] The obtained glucose-α-cyclodextrin complex enzymatic hydrolysate was concentrated under reduced pressure and low temperature to remove free water from the system, thus preparing a high-solids-content concentrated sugar solution. This eliminated the interference of water on the subsequent esterification and polycondensation reaction and improved the reactivity of the raw materials.

[0011] S3: Preparation of glucose-cyclodextrin modified rosin glycerol polymer

[0012] Concentrated sugar solution, rosin, glycerol and acidic catalyst are mixed evenly, and first esterification reaction is carried out at low temperature and normal pressure to achieve preliminary grafting modification of rosin carboxyl groups with glucose, α-cyclodextrin and glycerol hydroxyl groups; then vacuum decompression polymerization is carried out at high temperature to continuously remove small molecule water generated in the reaction, and further cross-linking polymerization is carried out to obtain a glucose-cyclodextrin modified rosin glycerol polymer with stable structure and both plasticity and lipophilic properties.

[0013] S4: Preparation of Plastic Sustained-Release Film Molding

[0014] The modified polymer was heated and melted to plasticize it, and then uniformly laid into a film using a casting process. After cooling, shaping, and demolding, a plastic oleophilic bio-based sustained-release film capable of loading pheromones and possessing uniform and long-lasting sustained-release properties was prepared.

[0015] Furthermore, S1 specifically includes the following steps:

[0016] S1.1: Prepare a starch slurry with corn starch and deionized water at a mass concentration of 15% to 25%. After stirring thoroughly, heat the mixture to 85 to 90°C and gelatinize for 15 to 30 minutes to completely destroy the crystalline structure of the starch granules and obtain a uniform and transparent gelatinized starch solution.

[0017] S1.2: The pH of the gelatinized starch solution was adjusted to 5.5-6.5 using a phosphate buffer system. The thermoresistant α-amylase was added at a ratio of 5-10 U / g dry starch. The reaction was carried out at a constant temperature of 80-85℃ for 30-60 min to degrade the macromolecular starch into linear short-chain dextrins and a small amount of glucose. Only linear hydrolysis occurred in this stage, and no cyclodextrins were generated.

[0018] S1.3: After liquefaction, boil at 100℃ for 10 min to inactivate enzymes. After cooling, adjust the pH of the system to 5.0-6.0. Add cyclodextrin glucosyltransferase at a ratio of 10-30 U / g dry starch, and add 5%-8% n-decyl alcohol as an α-cyclodextrin directional complexing agent. React at 50-55℃ for 6-18 h to directionally catalyze the cyclization of short-chain dextrin to generate α-cyclodextrin, thus obtaining a complex enzymatic hydrolysate solution in which glucose and α-cyclodextrin coexist.

[0019] Furthermore, S2 specifically includes the following steps:

[0020] S2.1: Place the compound enzymatic hydrolysate in a vacuum concentration device, control the temperature at 60-70℃ and the vacuum degree at -0.06--0.08MPa for reduced pressure concentration, and continuously remove free water.

[0021] S2.2: Concentrate until the sugar solution has a solid content of ≥50%, then stop the concentration process, cool, seal, and store for later use.

[0022] Furthermore, S3 specifically includes the following steps:

[0023] S3.1: According to the mass ratio, take 100 parts of concentrated sugar solution, 80-120 parts of rosin, 15-30 parts of glycerol, and 0.5-1.0 parts of acidic catalyst, put them into the reaction vessel, and stir and mix them evenly at 150-300 r / min.

[0024] S3.2: Under normal pressure, the temperature is raised to 120-140℃ and the esterification reaction is carried out at a constant temperature for 2-3 hours to complete the initial grafting esterification of rosin and the polyhydroxy system.

[0025] S3.3: Continue heating to 160-180℃, adjust the vacuum to -0.08--0.1MPa, reduce the pressure and polymerize for 3-5 hours, continuously remove the reaction by-product water until the acid value of the system is ≤20mgKOH / g, and obtain the modified rosin glycerol polymer.

[0026] Furthermore, S4 specifically includes the following steps:

[0027] S4.1: Heat the prepared modified rosin glycerol polymer to 80-100℃ to fully melt and plasticize it to obtain a homogeneous melt.

[0028] S4.2: The melt is uniformly coated onto the surface of a flat substrate using a casting process to control the coating thickness to be uniform and consistent.

[0029] S4.3: After natural cooling and molding at room temperature, a flexible, hydrophobic, and oleophilic bio-based plastic sustained-release film is obtained, which can be used for the encapsulation and sustained release of insect pheromones.

[0030] Furthermore, the acidic catalyst is any one of p-toluenesulfonic acid, citric acid, and phosphoric acid.

[0031] Furthermore, step S1 employs a segmented dual-enzyme stepwise reaction mechanism. α-Amylase is only responsible for the liquefaction and degradation of starch long chains and has no cyclization function. Cyclodextrin glucosyltransferase specifically achieves intramolecular cyclization of dextrin molecules, directionally generating α-cyclodextrin, thus realizing the precise preparation of bifunctional sugar components.

[0032] Furthermore, the reaction in step S3 is continuously stirred throughout to avoid localized high-temperature coking of the materials and to ensure that the esterification and polycondensation reaction proceeds uniformly.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] This invention also provides a glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane prepared according to the above preparation method. The sustained-release membrane uses glucose and α-cyclodextrin as hydrophilic modified backbones, grafts rosin lipophilic long chains through esterification bonds, and relies on glycerol to achieve molecular cross-linking and internal plasticization to form a stable three-dimensional network structure. The hollow molecular cavity of α-cyclodextrin is used to achieve molecular inclusion and locking of insect pheromones, and combined with the slow permeation of the polymer matrix, the pheromone is released uniformly and for a long time. Attached Figure Description

[0035] The accompanying drawings illustrate embodiments and, together with the specification summary, serve to explain the principles of this disclosure and enable those skilled in the art to implement and use this disclosure.

[0036] Figure 1 This is a flowchart illustrating the overall preparation process of the glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane of the present invention.

[0037] Figure 2 The figure shows the test results of the hydrophobic and oleophilic properties of the sustained-release membrane prepared according to the present invention.

[0038] Figure 3 This is a comparative graph showing the effect of different amounts of rosin glycerol on the graft copolymerization rate of glucose / α-cyclodextrin according to the present invention.

[0039] Figure 4 This is a SEM image of the surface microstructure of the plastic sustained-release membrane prepared in Example 3 of the present invention.

[0040] Figure 5 A cross-sectional view of the pheromone slow-release inducer prepared in Example 3 of the present invention.

[0041] Figure 6 The graph shows the cumulative release rate of the pheromone sustained-release membranes prepared in Examples 1-3 of this invention over 60 days. Detailed Implementation

[0042] The following describes in detail, with reference to the accompanying drawings and specific embodiments, a glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method provided by the present invention.

[0043] Example 1

[0044] A glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method, such as Figure 1 As shown, it includes the following steps:

[0045] S1: Preparation of glucose-α-cyclodextrin complex sugar solution by segmented double enzymatic hydrolysis of corn starch

[0046] S1.1: Prepare a starch slurry with corn starch and deionized water at a mass concentration of 20%, stir continuously until uniform, heat to 88℃ and gelatinize for 20 minutes to completely destroy the starch crystal structure and obtain a transparent and uniform gelatinized starch solution.

[0047] S1.2: The pH of the gelatinization solution was adjusted to 6.0 using a phosphate buffer system. 8 U / g of heat-resistant α-amylase of dry starch was added, and the solution was liquefied at 82℃ for 45 min to degrade the macromolecular starch into linear short-chain dextrins and a small amount of glucose. Only linear hydrolysis occurred in this stage, and no cyclodextrins were generated. After liquefaction, the solution was boiled at 100℃ for 10 min to inactivate the enzyme and then cooled for later use.

[0048] S1.3: Adjust the pH of the cooled liquefied solution to 5.5, add 20 U / g dry starch cyclodextrin glucosyltransferase, and add 6% n-decyl alcohol as a directional complexing agent. React at 52℃ for 12 h to directionally catalyze the cyclization of dextrin to generate α-cyclodextrin, thus obtaining a glucose and α-cyclodextrin complex enzymatic hydrolysate.

[0049] S2: Pretreatment for Concentration of Compound Sugar Solution

[0050] The compound enzymatic hydrolysate was placed in a vacuum concentration device, and the temperature was controlled at 65℃ and the vacuum degree at -0.07MPa until the solid content of the sugar solution reached 55%. It was then cooled, sealed, and stored for later use to eliminate the interference of moisture on the subsequent esterification reaction.

[0051] S3: Preparation of modified bio-based polymers by esterification polycondensation

[0052] By weight, 100 parts concentrated sugar solution, 100 parts rosin, 40 parts glycerol, and 0.8 parts p-toluenesulfonic acid were added to a reaction vessel and stirred at 200 r / min until homogeneous. First, an esterification reaction was carried out at 130℃ under normal pressure for 2.5 h to achieve preliminary grafting modification of rosin with sugar and glycerol. Then, the temperature was raised to 170℃ and the pressure was reduced to -0.09 MPa for 4 h to continuously remove by-product moisture. The reaction was stopped when the acid value of the system dropped to 18 mg KOH / g, and the modified rosin glycerol polymer was obtained.

[0053] Two small pieces of the prepared modified rosin glycerol polymer were placed in two 15mL vials. One vial contained 10mL of purified water, and the other contained 10mL of liquid paraffin. After 30 minutes, the liquid levels in the vials were checked. The hydrophobicity and oleophilicity test results of the modified rosin glycerol polymer were as follows: Figure 3 As shown.

[0054] S4: Preparation of a plastic sustained-release film

[0055] The prepared modified polymer was heated to 90°C to fully melt and plasticize, and then uniformly laid into a film using a casting process. After natural cooling and shaping at room temperature, the film was demolded to obtain a flexible, plastic, hydrophobic, and oleophilic bio-based slow-release film. The slow-release film was then mixed uniformly with insect pheromones, dispersants, wetting agents, and adhesives, and then slightly plasticized to obtain a pheromone-specific slow-release film material.

[0056] In this embodiment, the components of the sustained-release membrane have a stable functional ratio, and the long-term, uniform, sustained release of pheromones is achieved by relying on the dual mechanisms of cyclodextrin cavity inclusion and matrix permeation.

[0057] Comparison Example

[0058] The difference between this comparative example and Example 1 is that rosin, glycerin, and deionized water without any added materials are used as controls, as follows: Figure 3 The effect of rosin and glycerol on the graft copolymerization rate of glucose / α-cyclodextrin concentrate is shown in the figure.

[0059] Example 2

[0060] A glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method include the following steps:

[0061] S1: Preparation of glucose-α-cyclodextrin complex sugar solution by segmented double enzymatic hydrolysis of corn starch

[0062] S1.1: Prepare a starch milk with corn starch and deionized water at a mass concentration of 15%, stir evenly, and heat to 85℃ for 30 min to gelatinize; adjust the pH to 5.5, add 5 U / g dry starch heat-resistant α-amylase, liquefy at 80℃ for 60 min, and boil at 100℃ for 10 min to inactivate the enzyme.

[0063] S1.2: After cooling, adjust the pH of the system to 5.0, add 10 U / g dry starch cyclodextrin glucosyltransferase, add 5% n-decyl alcohol, and react at 50℃ for 18 h to obtain a complex enzymatic hydrolysate.

[0064] S2: Pretreatment for Concentration of Compound Sugar Solution

[0065] Concentrate the sugar solution at 60℃ and -0.06MPa under reduced pressure until the solid content is 50%, then cool and set aside.

[0066] S3: Preparation of modified bio-based polymers by esterification polycondensation

[0067] Take 100 parts concentrated sugar solution, 80 parts rosin, 20 parts glycerol, and 0.5 parts citric acid by weight, stir evenly at 150 r / min; esterify at 120℃ under normal pressure for 3 h, and then reduce the pressure and polymerize at 160℃ and -0.08 MPa for 5 h until the acid value of the system is ≤20 mg KOH / g, to obtain the modified polymer.

[0068] S4: Preparation of a plastic sustained-release film

[0069] The polymer is melted and plasticized at 80°C, cast into a film, cooled and shaped, and then demolded. After loading with insect pheromones, a slow-release membrane material is obtained.

[0070] In this embodiment, the amount of rosin and glycerin added is relatively low, the membrane hardness is slightly high, the plasticity is moderate, and the structure is dense, making it suitable for scenarios involving the stable and sustained release of high-concentration pheromones.

[0071] Example 3

[0072] A glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane and its preparation method include the following steps:

[0073] S1: Preparation of glucose-α-cyclodextrin complex sugar solution by segmented double enzymatic hydrolysis of corn starch

[0074] S1.1: Prepare a starch milk with corn starch and deionized water at a mass concentration of 25%, heat to 90℃ and gelatinize for 15 min; adjust the pH to 6.5, add 10 U / g dry starch of heat-resistant α-amylase, liquefy at 85℃ for 30 min, and inactivate the enzyme with boiling water for 10 min.

[0075] S1.2: Cool and adjust pH to 6.0, add 30 U / g dry starch cyclodextrin glucosyltransferase, add 8% n-decyl alcohol by volume, and react at 55℃ for 6 hours to obtain a complex sugar solution with high cyclodextrin content.

[0076] S2: Pretreatment for Concentration of Compound Sugar Solution

[0077] Concentrate the sugar solution at 70℃ and -0.08MPa under reduced pressure until the solid content is 58%, then cool and set aside.

[0078] S3: Preparation of modified bio-based polymers by esterification polycondensation

[0079] By weight, take 100 parts concentrated sugar solution, 80 parts rosin, 40 parts glycerol, and 1.0 part phosphoric acid, and stir evenly at 300 r / min; esterify at 140℃ under normal pressure for 2 h, and then reduce the pressure at 180℃ and -0.1 MPa for 3 h until the acid value of the system meets the standard, to obtain a highly plastic modified polymer.

[0080] S4: Preparation of plastic slow-release tubes

[0081] The polymer is heated to 100°C to melt and plasticize, and then a tubular preform is made by casting. After cooling and shaping, a highly flexible plastic slow-release capillary can be prepared.

[0082] S5: Preparation of pheromone carrier decoy

[0083] The spare cotton thread was smeared with insect pheromone compounds. The insect pheromone and antioxidant were added to dodecanol (slow-release agent) in a predetermined ratio. The mixture was stirred at room temperature and protected from light until completely dissolved to prepare a homogeneous slow-release stock solution. The stock solution was sealed and stored in the dark for later use.

[0084] Take a thin iron wire with a diameter of 0.1–0.3 mm, and evenly wrap or tie a degreased cotton thread around its surface to make a composite support core covered with cotton thread.

[0085] The composite support core is inserted into the prepared plastic slow-release tube, ensuring that the cotton thread core runs through the entire length of the tube. A small amount of cotton thread or wire can be left to protrude from both ends for subsequent sealing and hanging in the field. Then, the pheromone slow-release mother liquor is injected into the tube. The capillary action of the cotton thread is used to make the liquid evenly wet the tube and avoid air bubbles. Finally, the two ends of the tube are heat-sealed to obtain a highly flexible plastic slow-release pheromone core with a support structure.

[0086] The sustained-release membrane prepared in Example 3 was characterized by its microstructure using SEM, as shown below. Figure 4 As shown: In Example 3, the membrane has abundant flexible pores, a smooth surface, uniform pores, and a dense structure.

[0087] Cross-sectional view of the pheromone carrier decoy prepared in Example 3, as shown. Figure 5 As shown in the figure, 1 represents a plastic slow-release tube, 2 represents a degreased cotton thread soaked in pheromones, and 3 represents a thin iron wire.

[0088] The pheromone carrier decoy prepared in Example 3 was subjected to a 60-day long-term sustained-release test in a simulated field environment at 40°C. Figure 6 As shown: the phenomenon of explosive release in the early stage and discontinuous release in the later stage, the slow release curve is smooth and stable. Compared with traditional single starch-based and rosin-based carriers, the slow release rate is more stable and can play a long-term and stable role in the control of agricultural and forestry pests.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing a glucose-cyclodextrin modified rosin glycerol plastic sustained-release film, characterized in that, Includes the following steps: S1. Enzymatic hydrolysis of corn starch: Mix corn starch with deionized water to prepare a starch milk with a mass concentration of 15%–25%. Heat the mixture to 85–90℃ and gelatinize for 15–30 min. Adjust the pH of the system to 5.5–6.5, add thermoresistant α-amylase and liquefy for 30–60 min. After enzyme inactivation, cool the mixture. Adjust the pH of the liquefied solution to 5.0–6.0, add cyclodextrin glucosyltransferase, and react at a constant temperature of 50–55℃ for 6–18 h to obtain a mixed enzymatic hydrolysate rich in glucose and α-cyclodextrin. S2, sugar solution concentration: The mixed enzymatic hydrolysis sugar solution obtained in step S1 is concentrated under reduced pressure to remove free water from the system and obtain a concentrated sugar solution with a solid content ≥50%. S3. Esterification and Polycondensation Modification: Rosin, glycerol and acidic catalyst are added sequentially to concentrated sugar solution and stirred until uniform. Esterification reaction is carried out at 120-140℃ and normal pressure for 2-3 hours. Then, the temperature is raised to 160-180℃ and vacuum degree is -0.08 to -0.1MPa for compression polymerization reaction for 3-5 hours until the acid value of the system is ≤20mgKOH / g, and glucose-cyclodextrin modified rosin glycerol bio-based polymer is obtained. S4. Film Formation Treatment: The obtained polymer is melted and plasticized, and a casting film formation process is adopted. After spreading, cooling, shaping and demolding, a glucose-cyclodextrin modified rosin glycerol plastic sustained-release film is obtained.

2. The preparation method according to claim 1, characterized in that, In step S1, the amount of heat-resistant α-amylase added is 5-10 U / g dry corn starch, and the amount of cyclodextrin glucosyltransferase added is 10-30 U / g dry corn starch.

3. The preparation method according to claim 1, characterized in that, In step S1, n-decyl alcohol is added as a directional complexing agent during the enzymatic hydrolysis reaction. The volume of n-decyl alcohol added accounts for 5% to 8% of the starch liquefaction liquid volume, and is used for the directional enrichment of α-cyclodextrin.

4. The preparation method according to claim 1, characterized in that, In step S3, the raw materials are proportioned by mass as follows: 100 parts concentrated sugar solution, 80-120 parts rosin, 15-30 parts glycerin, and 0.5-1.0 parts acidic catalyst.

5. The preparation method according to claim 1 or 4, characterized in that, The acidic catalyst is any one of p-toluenesulfonic acid, citric acid, and phosphoric acid.

6. The preparation method according to claim 1, characterized in that, In step S1, the enzyme inactivation method is to boil at 100℃ and keep warm for 10 minutes.

7. The preparation method according to claim 1, characterized in that, The reaction in step S3 is continuously stirred at a speed of 150-300 r / min to prevent the material from coking and agglomerating.

8. A glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane, characterized in that, The sustained-release membrane is prepared by any one of claims 1-7. It uses glucose and α-cyclodextrin as modified backbones, and combines rosin lipophilic segments by esterification grafting and is plasticized by glycerol crosslinking to form a three-dimensional network structure. The sustained-release membrane has thermoplasticity and hydrophobic and lipophilic properties. It achieves long-term stable sustained release by means of the cyclodextrin cavity inclusion structure and is biodegradable.

9. The glucose-cyclodextrin modified rosin glycerol plastic sustained-release membrane according to claim 8, characterized in that, The sustained-release membrane has a softening point of 60-80℃, is flexible and malleable at room temperature, and does not crack, making it suitable for sustained-release loading scenarios of drugs and agricultural and forestry adjuvants.

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