Ion exchange resin based on polysaccharide derivative and application of ion exchange resin in debitterizing and deacidifying citrus juice

Abstract

A preparation method of the ion exchange resin based on the polysaccharide derivative comprises the following steps: mixing a hyperbranched polymer, chitosan and water, adding an oil phase, emulsifying, adding a cross-linking agent, reacting, and removing the water and the oil phase, so as to obtain the ion exchange resin based on the polysaccharide derivative. And obtaining the ion exchange resin based on the polysaccharide derivative. The structure of the ion exchange resin based on the polysaccharide derivative contains amino groups, hydroxyl groups and hyperbranched structures, has positive charges, can effectively adsorb limonin and citric acid in the citrus juice, greatly reduces the content of limonin and citric acid in the citrus juice, solves the problem of heavy bitter and sour taste in the citrus juice, and has a good application prospect. Meanwhile, the problem that the chitosan is difficult to directly utilize due to the fact that the chitosan is easy to lose in an acid solution is solved.

Description

Technical Field

[0001] This invention belongs to the field of fine chemical application technology, and in particular relates to an ion exchange resin based on polysaccharide derivatives and its application in debittering and reducing acidity of citrus juice. Background Technology

[0002] Ion exchange resins are high-molecular polymers with active groups carrying exchange ions and a cross-linked network structure. They are commonly used in food (such as sugar refining, monosodium glutamate production, winemaking, and fruit juice production), water treatment, pharmaceuticals, synthetic chemistry and petrochemicals, and air purification (such as removing acidic gases, alkaline gases, and VOCs). Ion exchange resins can be broadly classified into cation exchange resins and anion exchange resins. Cation exchange resins are further divided into strongly acidic and weakly acidic types, while anion exchange resins are divided into strongly basic and weakly basic types.

[0003] The working principle of ion exchange resins is to remove or separate ions by exchanging their chemically active groups with ions in the solution. For example, strong-base anion exchange resins contain strong-base groups that can adsorb and bind with anions in the solution, resulting in anion exchange.

[0004] Chitosan is a natural cationic linear polysaccharide derived from the exoskeletons of crustaceans and chitin in the cell walls of insects and fungi. Its unique structure endows it with a series of excellent properties, such as good biocompatibility, non-toxicity, and biodegradability, making it a focus of attention in many fields, especially in medicine, where it is widely used for drug sustained release, drug delivery, wound dressings, and tissue engineering. The molecular structure of chitosan contains abundant amino and hydroxyl groups, which can adsorb organic acids through electrostatic interactions. However, chitosan is easily lost in acidic solutions, exhibits weak mechanical stability, and is difficult to separate from solutions, making direct utilization challenging.

[0005] my country is one of the world's centers of origin for citrus fruits. Citrus juice is a popular type of juice, containing a variety of nutrients. However, during processing, citrus juices can develop excessive bitterness, also known as "after-bitterness," and have a high content of fruit acids (mainly citric acid), severely limiting their comprehensive utilization. Years of research have shown that the main substance causing bitterness in citrus juices such as ponkan juice is limonene.

[0006] Resin adsorption is a commonly used method for debittering and reducing acidity in citrus juices, but current methods are not very effective. Therefore, developing an ion exchange resin with good debittering and acid-reducing effects has significant market potential. Summary of the Invention

[0007] To address the shortcomings of the existing technology, an ion exchange resin based on polysaccharide derivatives is provided. This ion exchange resin contains amino, hydroxyl, and hyperbranched structures and carries a positive charge. It can effectively adsorb limonene and citric acid in citrus juice, greatly reducing the content of limonene and citric acid in citrus juice, solving the problem of strong bitter and sour taste in citrus juice. At the same time, it solves the problem that chitosan is easily lost in acidic solutions, making it difficult to use directly.

[0008] The purpose of this invention is to provide a method for preparing an ion exchange resin based on polysaccharide derivatives, comprising the following steps:

[0009] Hyperbranched polymer, chitosan, and water are mixed, an oil phase is added, emulsification is performed, a crosslinking agent is added, the reaction is carried out, and water and oil phases are removed to obtain an ion exchange resin based on polysaccharide derivatives.

[0010] In some embodiments of the present invention, the preparation of the hyperbranched polymer includes the following steps:

[0011] Polyethylene glycol, pentaerythritol triacrylate, hydroxyalkyl-substituted trimethylammonium hydroxide, catalyst, and solvent are mixed and heated to react, yielding a hyperbranched polymer.

[0012] In some embodiments of the present invention, the molecular weight of the chitosan is 4000 Da to 6000 Da.

[0013] In some embodiments of the present invention, the oil phase includes at least one of vegetable oil, cyclohexane, n-hexane, paraffin oil, toluene, and ethyl acetate.

[0014] In some embodiments of the present invention, the crosslinking agent is selected from diisocyanates.

[0015] In some embodiments of the present invention, the diisocyanate includes at least one of diphenylmethane diisocyanate, toluene diisocyanate, hydrogenated benzyl diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

[0016] In some embodiments of the present invention, the mass ratio of the hyperbranched polymer, chitosan and crosslinking agent is 10~20:40~60:3~5.

[0017] In some embodiments of the present invention, the reaction temperature is 35~45°C and the time is 8~16 hours.

[0018] In some embodiments of the present invention, the molecular weight of the polyethylene glycol is 1000 Da to 2000 Da.

[0019] In some embodiments of the present invention, the hydroxyalkyl-substituted trimethyl ammonium hydroxide is selected from at least one of (5-hydroxypentyl)trimethyl ammonium hydroxide, (6-hydroxyhexyl)trimethyl ammonium hydroxide, (7-hydroxyheptyl)trimethyl ammonium hydroxide, and (8-hydroxyoctyl)trimethyl ammonium hydroxide.

[0020] In some embodiments of the present invention, the catalyst is selected from lithium bis(trifluoromethanesulfonyl)imide.

[0021] In some embodiments of the present invention, the solvent is selected from at least one of toluene and acetone.

[0022] In some embodiments of the present invention, the molar ratio of polyethylene glycol, pentaerythritol triacrylate, hydroxyalkyl-substituted trimethylammonium hydroxide and catalyst is 0.3~0.5:1:0.5~0.7:0.05~0.2.

[0023] In some embodiments of the present invention, the heating reaction is carried out at a temperature of 55-110°C for 4-8 hours.

[0024] Another object of the present invention is to provide an ion exchange resin based on polysaccharide derivatives, which is prepared by a method comprising the preparation of the aforementioned ion exchange resin based on polysaccharide derivatives.

[0025] Another object of the present invention is to provide the application of the polysaccharide derivative-based ion exchange resin in the debittering and acid reduction of citrus juice, comprising the following steps:

[0026] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0027] S2. After soaking the polysaccharide derivative-based ion exchange resin in anhydrous ethanol, acid washing, and alkali washing, the resin is packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0028] S3. Sterilize and inactivate enzymes in citrus juice at 85~90℃ for 3~7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives to obtain debittered and deacidified citrus juice.

[0029] In some embodiments of the present invention, in S3, the height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 10:1 to 20:1.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The ion exchange resin based on polysaccharide derivatives of the present invention uses hyperbranched polymers to modify chitosan, which solves the problem that chitosan is easily lost in acidic solutions, thus making it difficult to use directly.

[0032] (2) The ion exchange resin based on polysaccharide derivatives of the present invention contains amino, hydroxyl and hyperbranched structures and carries a positive charge, which can effectively adsorb limonene and citric acid in citrus juice, greatly reduce the content of limonene and citric acid in citrus juice, and solve the problem of strong bitter and sour taste in citrus juice. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0034] Example 1

[0035] This embodiment provides an ion exchange resin based on polysaccharide derivatives, the preparation method of which specifically includes the following steps:

[0036] S1. Mix 3g of polyethylene glycol with a molecular weight of 2000 Da, 10g of pentaerythritol triacrylate, 7g of (8-hydroxyoctyl)trimethylammonium hydroxide, 0.5g of lithium bis(trifluoromethanesulfonyl)imide and 150ml of toluene, heat at 110℃ for 4h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0037] S2. Mix 1g of hyperbranched polymer, 6g of chitosan with a molecular weight of 4000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of n-hexane, emulsify, then add 0.3g of diphenylmethane diisocyanate, react at 40℃ for 12h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0038] Example 2

[0039] This embodiment provides an ion exchange resin based on polysaccharide derivatives, the preparation method of which specifically includes the following steps:

[0040] S1. Mix 5g of polyethylene glycol with a molecular weight of 1000 Da, 10g of pentaerythritol triacrylate, 5g of (8-hydroxyoctyl)trimethylammonium hydroxide, 2g of lithium bis(trifluoromethanesulfonyl)imide and 150ml of toluene, heat at 55°C for 8h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0041] S2. Mix 2g of hyperbranched polymer, 4g of chitosan with a molecular weight of 6000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of cyclohexane, emulsify, then add 0.5g of toluene diisocyanate, react at 35℃ for 16h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0042] Example 3

[0043] This embodiment provides an ion exchange resin based on polysaccharide derivatives, the preparation method of which specifically includes the following steps:

[0044] S1. Mix 4g of polyethylene glycol with a molecular weight of 1500 Da, 10g of pentaerythritol triacrylate, 6g of (8-hydroxyoctyl)trimethylammonium hydroxide, 1g of lithium bis(trifluoromethanesulfonylimide) and 150ml of toluene, heat at 110℃ for 6h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0045] S2. Mix 1.5g of hyperbranched polymer, 5g of chitosan with a molecular weight of 5000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of ethyl acetate, emulsify, then add 0.4g of isophorone diisocyanate, react at 45℃ for 8h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0046] Example 4

[0047] This embodiment provides an ion exchange resin based on polysaccharide derivatives. The only difference from Example 3 is the monomer used to prepare the hyperbranched polymer. The preparation method specifically includes the following steps:

[0048] S1. Mix 4g of polyethylene glycol with a molecular weight of 1500 Da, 10g of pentaerythritol triacrylate, 6g of (7-hydroxyheptyl)trimethylammonium hydroxide, 1g of lithium bis(trifluoromethanesulfonylimide) and 150ml of toluene, heat at 110℃ for 6h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0049] S2. Mix 1.5g of hyperbranched polymer, 5g of chitosan with a molecular weight of 5000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of ethyl acetate, emulsify, then add 0.4g of isophorone diisocyanate, react at 45℃ for 8h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0050] Example 5

[0051] This embodiment provides an ion exchange resin based on polysaccharide derivatives. The only difference from Example 3 is the monomer used to prepare the hyperbranched polymer. The preparation method specifically includes the following steps:

[0052] S1. Mix 4g of polyethylene glycol with a molecular weight of 1500 Da, 10g of pentaerythritol triacrylate, 6g of (6-hydroxyhexyl)trimethylammonium hydroxide, 1g of lithium bis(trifluoromethanesulfonylimide) and 150ml of toluene, heat at 110℃ for 6h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0053] S2. Mix 1.5g of hyperbranched polymer, 5g of chitosan with a molecular weight of 5000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of ethyl acetate, emulsify, then add 0.4g of isophorone diisocyanate, react at 45℃ for 8h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0054] Example 6

[0055] This embodiment provides an ion exchange resin based on polysaccharide derivatives. The only difference from Example 3 is the monomer used to prepare the hyperbranched polymer. The preparation method specifically includes the following steps:

[0056] S1. Mix 4g of polyethylene glycol with a molecular weight of 1500 Da, 10g of pentaerythritol triacrylate, 6g of (5-hydroxypentyl)trimethylammonium hydroxide, 1g of lithium bis(trifluoromethanesulfonylimide) and 150ml of toluene, heat at 110℃ for 6h, remove the solvent by rotary evaporation to obtain hyperbranched polymer.

[0057] S2. Mix 1.5g of hyperbranched polymer, 5g of chitosan with a molecular weight of 5000Da and 30ml of water, adjust the pH to 2 with hydrochloric acid, add 10ml of ethyl acetate, emulsify, then add 0.4g of isophorone diisocyanate, react at 45℃ for 8h, remove water by rotary evaporation, wash away oil droplets with ethyl acetate to obtain an ion exchange resin based on polysaccharide derivative.

[0058] Example 7

[0059] This embodiment provides an application of ion exchange resin based on polysaccharide derivatives in debittering and reducing acidity of citrus juice, specifically including the following steps:

[0060] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0061] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 1 in anhydrous ethanol, acid washing and alkali washing, the resin is packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0062] S3. Sterilize and inactivate enzymes in citrus juice at 90℃ for 3 minutes, centrifuge, and collect the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0063] Example 8

[0064] This embodiment provides an application of a polysaccharide derivative-based ion exchange resin in debittering and acid reduction of citrus juice. The only difference from Example 7 is the use of a different polysaccharide derivative-based ion exchange resin. The specific steps include:

[0065] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0066] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 2 in anhydrous ethanol, acid washing and alkali washing, the resin was packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0067] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0068] Example 9

[0069] This embodiment provides an application of a polysaccharide derivative-based ion exchange resin in debittering and acid reduction of citrus juice. The only difference from Example 7 is the use of a different polysaccharide derivative-based ion exchange resin. The specific steps include:

[0070] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0071] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 3 in anhydrous ethanol, acid washing and alkali washing, the resin was packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0072] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0073] Example 10

[0074] This embodiment provides an application of a polysaccharide derivative-based ion exchange resin in debittering and acid reduction of citrus juice. The only difference from Example 7 is the use of a different polysaccharide derivative-based ion exchange resin. The specific steps include:

[0075] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0076] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 4 in anhydrous ethanol, acid washing and alkali washing, the resin was packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0077] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0078] Example 11

[0079] This embodiment provides an application of a polysaccharide derivative-based ion exchange resin in debittering and acid reduction of citrus juice. The only difference from Example 7 is the use of a different polysaccharide derivative-based ion exchange resin. The specific steps include:

[0080] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0081] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 5 in anhydrous ethanol, acid washing and alkali washing, the resin was packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0082] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0083] Example 12

[0084] This embodiment provides an application of a polysaccharide derivative-based ion exchange resin in debittering and acid reduction of citrus juice. The only difference from Example 7 is the use of a different polysaccharide derivative-based ion exchange resin. The specific steps include:

[0085] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0086] S2. After soaking the polysaccharide derivative-based ion exchange resin of Example 6 in anhydrous ethanol, acid washing and alkali washing, the resin was packed into a column to obtain a polysaccharide derivative-based ion exchange resin column.

[0087] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives. The height-to-diameter ratio of the ion exchange resin column based on polysaccharide derivatives is 15:1, to obtain citrus juice after debittering and acid reduction.

[0088] Comparative Example 1

[0089] This comparative example provides a cross-linked chitosan, the preparation method of which specifically includes the following steps:

[0090] 6.5g of chitosan with a molecular weight of 5000Da was mixed with 30ml of water, the pH was adjusted to 2 with hydrochloric acid, 10ml of ethyl acetate was added, emulsified, and then 0.4g of isophorone diisocyanate was added. The mixture was reacted at 45℃ for 8h, water was removed by rotary evaporation, and oil droplets were washed away with ethyl acetate to obtain cross-linked chitosan.

[0091] Comparative Example 2

[0092] This comparative example provides an application of chitosan in debittering and acid reduction of citrus juice, specifically including the following steps:

[0093] S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice;

[0094] S2. After soaking the cross-linked chitosan of Comparative Example 1 in anhydrous ethanol, acid washing, and alkali washing, it was packed into a column to obtain a cross-linked chitosan column.

[0095] S3. Sterilize and inactivate enzymes in citrus juice at 85℃ for 7 minutes, centrifuge, and take the liquid to flow into a cross-linked chitosan column. The height-to-diameter ratio of the cross-linked chitosan column is 15:1 to obtain citrus juice after debittering and acid reduction.

[0096] Performance testing:

[0097] The debittering effect of citrus juice is expressed by the reduction of bitter substances in the citrus juice. The more limonene is reduced in the citrus juice after debittering treatment, the better the debittering effect.

[0098] A = (B0 - B1) / B0 × 100%;

[0099] In the formula, A is the debittering rate; B0 is the limonene content in citrus juice before debittering treatment; and B1 is the limonene content in citrus juice after each treatment.

[0100] The acid-reducing effect of citrus juice is expressed by the reduction of acidic substances in the citrus juice. The more citric acid is reduced in the citrus juice after acid reduction treatment, the better the acid-reducing effect.

[0101] D = (C0 - C1) / C0 × 100%;

[0102] In the formula, D is the acid reduction rate; C0 is the citric acid content in citrus juice before acid reduction treatment; and C1 is the citric acid content in citrus juice after each treatment.

[0103] Table 1. Test results of debittering and acid reduction rate.

[0104] sample Debitterness removal rate (%) Acid reduction rate (%) Example 7 93.7 73.2 Example 8 95.3 72.8 Example 9 94.6 71.3 Example 10 83.1 59.7 Example 11 80.9 57.1 Example 12 78.5 55.6 Comparative Example 2 46.2 31.9

[0105] As shown in Table 1, the ion exchange resin based on polysaccharide derivatives of the present invention has a good debittering and acid-reducing effect.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application specification, they can still modify or make equivalent substitutions to the specific implementation of the present invention, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.

Claims

1. A method for preparing an ion exchange resin based on polysaccharide derivatives, characterized in that, Includes the following steps: Hyperbranched polymer, chitosan, and water are mixed, an oil phase is added, emulsification is performed, a crosslinking agent is added, the reaction is carried out, and water and oil phases are removed to obtain an ion exchange resin based on polysaccharide derivatives.

2. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 1, characterized in that, The preparation of the hyperbranched polymer includes the following steps: Polyethylene glycol, pentaerythritol triacrylate, hydroxyalkyl-substituted trimethylammonium hydroxide, catalyst, and solvent are mixed and heated to react, yielding a hyperbranched polymer.

3. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 1, characterized in that, The molecular weight of the chitosan is 4000 Da to 6000 Da; The oil phase includes at least one of vegetable oil, cyclohexane, n-hexane, paraffin oil, toluene, and ethyl acetate; The crosslinking agent is selected from diisocyanates, including at least one of diphenylmethane diisocyanate, toluene diisocyanate, hydrogenated benzyl diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

4. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 1, characterized in that, The mass ratio of the hyperbranched polymer, chitosan, and crosslinking agent is 10~20:40~60:3~5.

5. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 1, characterized in that, The reaction is carried out at a temperature of 35-45°C for 8-16 hours.

6. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 2, characterized in that, The molecular weight of the polyethylene glycol is 1000 Da to 2000 Da; The hydroxyalkyl-substituted trimethyl ammonium hydroxide is selected from at least one of (5-hydroxypentyl)trimethyl ammonium hydroxide, (6-hydroxyhexyl)trimethyl ammonium hydroxide, (7-hydroxyheptyl)trimethyl ammonium hydroxide, and (8-hydroxyoctyl)trimethyl ammonium hydroxide; The catalyst is selected from lithium bis(trifluoromethanesulfonylimide); The solvent is selected from at least one of toluene and acetone.

7. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 2, characterized in that, The molar ratio of polyethylene glycol, pentaerythritol triacrylate, hydroxyalkyl-substituted trimethylammonium hydroxide and catalyst is 0.3~0.5:1:0.5~0.7:0.05~0.

2.

8. The method for preparing the ion exchange resin based on polysaccharide derivatives according to claim 2, characterized in that, The heating reaction is carried out at a temperature of 55~110℃ for 4~8 hours.

9. An ion exchange resin based on polysaccharide derivatives, characterized in that, It is prepared by the method of preparing the polysaccharide derivative-based ion exchange resin according to any one of claims 1 to 8.

10. The application of the polysaccharide derivative-based ion exchange resin according to claim 9 in the debittering and acidification reduction of citrus juice, characterized in that, Includes the following steps: S1. Wash, peel, juice, and filter fresh citrus fruits to obtain citrus juice; S2. After soaking the polysaccharide derivative-based ion exchange resin in anhydrous ethanol, acid washing, and alkali washing, the resin is packed into a column to obtain a polysaccharide derivative-based ion exchange resin column. S3. Sterilize and inactivate enzymes in citrus juice at 85~90℃ for 3~7 minutes, centrifuge, and transfer the liquid into an ion exchange resin column based on polysaccharide derivatives to obtain debittered and deacidified citrus juice.