Composite potassium metabisulfite-embedded slow-release carrier as well as preparation method and application of composite potassium metabisulfite-embedded slow-release carrier

Abstract

The invention provides a composite potassium metabisulfite embedded slow-release carrier as well as a preparation method and application thereof, and belongs to the technical field of embedded carriers. The composite slow-release carrier embedded with the potassium metabisulfite comprises the potassium metabisulfite, a middle layer wrapping the outer surface of the potassium metabisulfite and a shell layer wrapping the outer surface of the middle layer. The middle layer is made of a film made of a cellulose material; the material of the shell layer is a film obtained by carrying out cross-linking reaction on passion fruit peel polysaccharide. According to the slow-release carrier for compositely embedding the potassium metabisulfite, the potassium metabisulfite serves as a core, the potassium metabisulfite is sequentially wrapped by a film formed by a cellulose material and a film obtained by cross-linking reaction of passion fruit peel polysaccharide, and the two materials are selected as a middle layer and a shell layer respectively; during use, along with dissolution or swelling of the shell layer and the middle layer, dual release control is realized, so that the embedding carrier has an excellent effect of slowly releasing sulfur dioxide.

Description

Technical Field

[0001] This invention relates to the field of encapsulation carrier technology, and in particular to a composite encapsulated potassium metabisulfite sustained-release carrier, its preparation method, and its application. Background Technology

[0002] During the sealed aging process of wine, oxidation and microbial activity can cause wine to spoil. Therefore, it is necessary to add antibacterial and antioxidant agents to inhibit spoilage. Sulfur dioxide has selective bactericidal, antioxidant, clarifying, solubilizing, and acid-increasing effects. Adding a certain amount of sulfur dioxide during the storage and aging of wine, and maintaining the free sulfur dioxide in the wine at a certain concentration level, can prevent wine from spoiling.

[0003] In actual production, the concentration of free sulfur dioxide during wine aging is generally maintained at around 20-30 mg / L. If the free sulfur dioxide in the wine falls below this concentration, it needs to be replenished promptly. Therefore, winemakers must regularly measure the concentration of free sulfur dioxide in the wine (every 1-3 months, more frequently for new wines and in summer) and add sulfur dioxide as needed to maintain the concentration at 20-30 mg / L. However, the frequent process of opening the cork for sampling and adding sulfur dioxide increases workload and also allows oxygen to enter, leading to the growth of aerobic microorganisms and the formation of microbial films, making the wine more prone to spoilage. On the other hand, if sufficient sulfur dioxide is added at once before wine storage, not only will the free sulfur dioxide level decrease over time, but excessive sulfur dioxide can also cause unpleasant flavors and a harsh texture, ultimately affecting the sensory quality of the wine.

[0004] Therefore, in order to reduce the frequency of cork opening sampling and adding sulfur dioxide, and thus prevent wine spoilage, how to provide a slow-release carrier with a slow-release sulfur dioxide effect is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a composite encapsulated potassium metabisulfite slow-release carrier, its preparation method, and its application. The composite encapsulated potassium metabisulfite slow-release carrier provided by this invention has the effect of slow-release sulfur dioxide over a long period of time.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: The present invention provides a composite encapsulated potassium metabisulfite slow-release carrier, comprising potassium metabisulfite, an intermediate layer encapsulating the outer surface of the potassium metabisulfite, and a shell layer encapsulating the outer surface of the intermediate layer; The intermediate layer is a membrane made of cellulose material; The shell is made of passion fruit peel polysaccharide through a cross-linking reaction.

[0007] Preferably, the cellulose material includes one or more of ethyl cellulose, cellulose acetate propionate, methyl cellulose, and hydroxypropyl methyl cellulose.

[0008] Preferably, the mass ratio of the potassium metabisulfite, the intermediate layer, and the shell is (150~300):(5~15):(600~1200).

[0009] Preferably, the particle size of the composite encapsulated potassium metabisulfite slow-release carrier is 3-5 mm.

[0010] This invention also provides a method for preparing the sustained-release carrier of the composite encapsulated potassium metabisulfite described in the above technical solution, comprising the following steps: Potassium metabisulfite was mixed with a cellulose material solution and dried to obtain cellulose microparticles encapsulated with potassium metabisulfite. The cellulose microparticles encapsulated with potassium metabisulfite were mixed with a passion fruit peel polysaccharide solution to obtain a dispersion. The dispersion was then mixed with a soluble calcium salt solution to carry out a cross-linking reaction, resulting in a composite sustained-release carrier encapsulated with potassium metabisulfite.

[0011] Preferably, the concentration of the cellulose material solution is 1.0~3.0 wt%.

[0012] Preferably, the volume ratio of the cellulose material solution to the mass ratio of potassium metabisulfite is 0.5 mL: 150~300 mg.

[0013] Preferably, the concentration of the passion fruit peel polysaccharide solution is 2.0~4.0 wt%.

[0014] Preferably, the crosslinking reaction temperature is 20~35℃; the crosslinking reaction time is 20~30min.

[0015] The present invention also provides the application of the composite encapsulated potassium metabisulfite slow-release carrier described in the above technical solution or the composite encapsulated potassium metabisulfite slow-release carrier prepared by the preparation method described in the above technical solution as a wine preservative.

[0016] This invention provides a composite potassium metabisulfite-encapsulated slow-release carrier, comprising potassium metabisulfite, an intermediate layer encapsulating the outer surface of the potassium metabisulfite, and a shell layer encapsulating the outer surface of the intermediate layer. The intermediate layer is a membrane formed of cellulose material; the shell layer is a membrane obtained by cross-linking passion fruit peel polysaccharide. The composite potassium metabisulfite-encapsulated slow-release carrier provided by this invention uses potassium metabisulfite as a core, with the potassium metabisulfite sequentially encapsulated by a membrane formed of cellulose material and a membrane obtained by cross-linking passion fruit peel polysaccharide. The selection of these two materials as the intermediate and shell layers respectively results in a higher encapsulation rate of potassium metabisulfite, which is more conducive to the slow release of sulfur dioxide. During use, the dissolution or swelling of the shell and intermediate layers achieves dual release control, thereby giving the encapsulated carrier an excellent effect in the slow release of sulfur dioxide. The results of the embodiments show that the potassium metabisulfite encapsulation rate of the composite potassium metabisulfite-encapsulated slow-release carrier provided by this invention can reach over 82%, and it can significantly improve the slow-release effect of sulfur dioxide during use. Attached Figure Description

[0017] Figure 1 Release rate curves of the composite encapsulated potassium metabisulfite sustained-release carriers prepared in Examples 1, 2, and Comparative Example 1 of this invention; Figure 2 This is a SEM image of the composite potassium metabisulfite-encapsulated slow-release carrier prepared in Example 1 and Comparative Example 1 of the present invention. Detailed Implementation

[0018] The present invention provides a composite encapsulated potassium metabisulfite slow-release carrier, comprising potassium metabisulfite, an intermediate layer encapsulating the outer surface of the potassium metabisulfite, and a shell layer encapsulating the outer surface of the intermediate layer; The intermediate layer is a membrane made of cellulose material; The shell is made of passion fruit peel polysaccharide through a cross-linking reaction.

[0019] The slow-release carrier for composite-encapsulated potassium metabisulfite provided by this invention includes potassium metabisulfite. This invention uses potassium metabisulfite as a core, enabling the release of sulfur dioxide.

[0020] The slow-release carrier for composite-encapsulated potassium metabisulfite provided by the present invention includes an intermediate layer wrapped around the outer surface of the potassium metabisulfite.

[0021] In this invention, the intermediate layer is a membrane formed of cellulose material. This invention uses a cellulose membrane as the intermediate layer, which has a dense structure. Water molecules enter the microparticles through the pores in the water-insoluble cellulose membrane, thereby dissolving and releasing potassium metabisulfite.

[0022] In this invention, the cellulose material preferably includes one or more of ethyl cellulose, cellulose acetate propionate, methyl cellulose, and hydroxypropyl methyl cellulose, more preferably ethyl cellulose. This invention utilizes the film-forming property of cellulose materials during drying to form a film on the surface of potassium metabisulfite, achieving excellent encapsulation of potassium metabisulfite.

[0023] The slow-release carrier for composite encapsulated potassium metabisulfite provided by the present invention includes a shell layer wrapped around the outer surface of the intermediate layer.

[0024] In this invention, the shell layer is a membrane obtained by cross-linking passion fruit peel polysaccharides. This invention uses a membrane obtained by cross-linking passion fruit peel polysaccharides as the shell layer, which has excellent encapsulation efficiency and a dense structure, facilitating the slow release of sulfur dioxide. Furthermore, the membrane obtained by cross-linking passion fruit peel polysaccharides dissolves or swells in water, allowing for the slow release of sulfur dioxide.

[0025] In this invention, the mass ratio of the potassium metabisulfite, the intermediate layer and the shell is preferably (150~300):(5~15):(600~1200), more preferably (200~250):(10~12):(800~1000).

[0026] In this invention, the particle size of the composite encapsulated potassium metabisulfite slow-release carrier is preferably 3-5 mm, more preferably 4-5 mm.

[0027] This invention also provides a method for preparing the sustained-release carrier of the composite encapsulated potassium metabisulfite described in the above technical solution, comprising the following steps: Potassium metabisulfite was mixed with a cellulose material solution and dried to obtain cellulose microparticles encapsulated with potassium metabisulfite. The cellulose microparticles encapsulated with potassium metabisulfite were mixed with a passion fruit peel polysaccharide solution to obtain a dispersion. The dispersion was then mixed with a soluble calcium salt solution to carry out a cross-linking reaction, resulting in a composite sustained-release carrier encapsulated with potassium metabisulfite.

[0028] This invention involves mixing potassium metabisulfite with a cellulose material solution and drying it to obtain cellulose microparticles encapsulated with potassium metabisulfite.

[0029] In this invention, the cellulose material in the cellulose material solution preferably includes one or more of ethyl cellulose, cellulose acetate propionate, methyl cellulose and hydroxypropyl methyl cellulose, and more preferably ethyl cellulose.

[0030] In this invention, the concentration of the cellulose material solution is preferably 1.0~3.0 wt%, more preferably 2.0~2.5 wt%. In this invention, the solvent for the cellulose material solution is preferably ethanol. Controlling the concentration of the cellulose material solution within the above range in this invention is more beneficial for improving the encapsulation efficiency of potassium parapyrosulfite after the cellulose material solution dries and forms a film.

[0031] In this invention, the volume ratio of the cellulose material solution to the mass ratio of potassium metabisulfite is preferably 0.5 mL: 150-300 mg. As one embodiment of this invention, the volume ratio of the cellulose material solution to the mass ratio of potassium metabisulfite can be 0.5 mL: 150 mg, 0.5 mL: 200 mg, 0.5 mL: 250 mg, or 0.5 mL: 300 mg. By controlling the volume ratio of the cellulose material solution to the mass ratio of potassium metabisulfite within the above range, this invention can improve the encapsulation efficiency of potassium metabisulfite.

[0032] The present invention does not have any particular limitation on the method of mixing potassium metabisulfite with the cellulose material solution, as long as the potassium metabisulfite can be fully dispersed in the cellulose material solution.

[0033] In this invention, the drying temperature is preferably 30-45°C, more preferably 40°C. The drying time is not particularly limited, as long as the solvent in the cellulose material solution is sufficiently removed. This invention utilizes the film-forming properties of the cellulose material to encapsulate potassium metabisulfite during the drying process, as the solvent evaporates.

[0034] After obtaining the cellulose microparticles encapsulated with potassium metabisulfite, the present invention mixes the cellulose microparticles encapsulated with potassium metabisulfite with passion fruit peel polysaccharide solution to obtain a dispersion; the dispersion is then mixed with a soluble calcium salt solution to carry out a cross-linking reaction, thereby obtaining a composite sustained-release carrier encapsulated with potassium metabisulfite.

[0035] In this invention, the concentration of the passion fruit peel polysaccharide solution is preferably 2.0~4.0 wt%, more preferably 3.0~4.0 wt%. Controlling the concentration of the passion fruit peel polysaccharide solution within the above range in this invention is more conducive to improving the encapsulation efficiency.

[0036] In this invention, the preferred method for preparing the passion fruit peel polysaccharide includes: Passion fruit peels were crushed and sieved in sequence to obtain passion fruit peel powder; The passion fruit peel powder is mixed with petroleum ether and then subjected to a first soaking treatment. After a first solid-liquid separation, the obtained solid is mixed with an ethanol solution and subjected to a second soaking treatment. After a second solid-liquid separation, pretreated passion fruit peel powder is obtained. The pretreated passion fruit peel powder was mixed with water and subjected to ultrasonic extraction to obtain an extract; the extract was then concentrated to obtain a concentrated extract. The concentrated extract was mixed with an ethanol solution and precipitated. The solid obtained from the precipitate was then purified to obtain passion fruit peel polysaccharide.

[0037] In this invention, passion fruit peel is preferably crushed and sieved sequentially to obtain passion fruit peel powder.

[0038] This invention preferably uses dried passion fruit peel. Using dried passion fruit peel makes it easier to crush.

[0039] The present invention does not impose any particular limitation on the pulverization method; any conventional pulverization method may be used.

[0040] In an embodiment of the present invention, the sieving can be done using a 40-mesh sieve.

[0041] After obtaining passion fruit peel powder, the present invention preferably mixes the passion fruit peel powder with petroleum ether and performs a first soaking treatment, followed by a first solid-liquid separation. The resulting solid is then mixed with an ethanol solution and subjected to a second soaking treatment, followed by a second solid-liquid separation to obtain pretreated passion fruit peel powder.

[0042] In this invention, the volume ratio of passion fruit peel powder to petroleum ether is preferably 1:5 to 8, more preferably 1:6.

[0043] In this invention, the first soaking treatment is preferably performed at room temperature. The first soaking treatment is preferably a combination of stirring and settling. In an embodiment of this invention, the stirring time can be 36 hours, and the settling time can be 30 minutes. This invention removes impurities from passion fruit peel powder through stirring and settling.

[0044] The present invention does not specifically limit the method of the first solid-liquid separation; any conventional solid-liquid separation method can be used to fully separate petroleum ether from the solid.

[0045] In this invention, the volume concentration of the ethanol solution is preferably 95%.

[0046] In this invention, the volume ratio of passion fruit peel powder to ethanol solution is preferably 1:5 to 8, more preferably 1:6.

[0047] In this invention, the second soaking treatment is preferably carried out at room temperature. Preferably, the second soaking treatment lasts for 3-4 days, with the ethanol solution being changed every 6-12 hours. This invention removes alcohol-soluble impurities from passion fruit peel powder through the second soaking treatment.

[0048] The present invention does not specifically limit the second solid-liquid separation method; any conventional solid-liquid separation method that can fully separate the ethanol solution from the solid is acceptable.

[0049] The present invention preferably dries the solid obtained from the second solid-liquid separation to obtain pretreated passion fruit peel powder.

[0050] After obtaining pretreated passion fruit peel powder, the present invention preferably mixes the pretreated passion fruit peel powder with water and performs ultrasonic extraction to obtain an extract; the extract is then concentrated to obtain a concentrated extract.

[0051] In this invention, the volume ratio of the water to the mass of the passion fruit peel powder is preferably (40~60) mL:1g, more preferably 50 mL:1g.

[0052] In this invention, the ultrasonic power of the ultrasonic extraction is preferably 100~150W, more preferably 105~120W; the ultrasonic extraction temperature is preferably 45~70℃, more preferably 50~70℃; and the ultrasonic extraction time is preferably 15~20min, more preferably 15min.

[0053] In this invention, the ultrasonic treatment is preferably performed twice. Preferably, the ultrasonically treated system is centrifuged to obtain a residue and a primary extract; the residue is then subjected to a second ultrasonic extraction, followed by centrifugation to obtain a secondary extract; the second ultrasonic treatment is the same as the ultrasonic treatment described in the above technical solution.

[0054] The present invention preferably combines the primary extract and the secondary extract for concentration.

[0055] This invention does not specifically limit the concentration method; any conventional concentration method can be used. In embodiments of this invention, the concentration method may be rotary evaporation at 60°C. In this invention, the volume of the concentrated extract is preferably 1 / 4 to 1 / 5 of the total extract volume.

[0056] After obtaining the concentrated extract, the present invention preferably mixes the concentrated extract with an ethanol solution, precipitates the precipitate, and removes impurities from the precipitated solid to obtain passion fruit peel polysaccharide.

[0057] In this invention, the volume concentration of the ethanol solution is preferably 95%.

[0058] In this invention, the volume ratio of the concentrated extract to the ethanol solution is preferably 1:3 to 6, more preferably 1:4.

[0059] In this invention, the precipitation temperature is preferably 0~4℃, more preferably 4℃; the precipitation time is preferably 12h. This invention utilizes ethanol solution to promote the precipitation of passion fruit peel polysaccharides from the concentrated extract.

[0060] In this invention, the preferred method for removing impurities is to mix the precipitated solid with water and redissolve it twice, and then freeze-dry the supernatant obtained from the redissolved solid to obtain passion fruit peel polysaccharide.

[0061] The weight-average molecular weight of the passion fruit peel polysaccharide obtained by the above preparation method is 38.2 kg / mol.

[0062] In this invention, the preferred ratio of the mass of the cellulose microparticles encapsulating potassium metabisulfite to the volume of the passion fruit peel polysaccharide solution is (155~315) mg: (15~40) mL, more preferably (255~315) mg: (30~40) mL.

[0063] The present invention does not have any particular limitation on the method of mixing the cellulose microparticles with potassium metabisulfite and the passion fruit peel polysaccharide solution, as long as the cellulose microparticles with potassium metabisulfite are fully dispersed in the passion fruit peel polysaccharide solution.

[0064] In this invention, the concentration of the soluble calcium salt solution is preferably 4.0~10.0 wt%, more preferably 4.0~8.0 wt%. In this invention, the soluble calcium salt solution is preferably a calcium chloride solution or a calcium lactate solution.

[0065] In this invention, when the concentration of the passion fruit peel polysaccharide solution is 2.0~4.0 wt% and the concentration of the soluble calcium salt solution is 4.0~10.0 wt%, the volume ratio of the soluble calcium salt solution to the passion fruit peel polysaccharide solution is preferably (1.0~2.5):1, more preferably (1.5~2.0):1. By controlling the volume ratio of the soluble calcium salt solution to the passion fruit peel polysaccharide solution within the above range, this invention is more conducive to the full cross-linking of the passion fruit peel polysaccharide.

[0066] In this invention, the temperature of the crosslinking reaction is preferably 20~35℃, more preferably 25~30℃; the time of the crosslinking reaction is preferably 20~30min, more preferably 25~30min.

[0067] The present invention preferably performs solid-liquid separation on the system obtained by the crosslinking reaction, and then washes the solid obtained by solid-liquid separation to obtain a slow-release carrier for composite encapsulating potassium metabisulfite.

[0068] In an embodiment of the present invention, the washing reagent may be water, and the washing may be performed three times.

[0069] The preparation method provided by this invention is simple and easy to control, and can form a uniformly wrapped intermediate layer and shell layer on the outside of potassium metabisulfite, so that the prepared sustained-release carrier has a dual sustained-release effect.

[0070] The present invention also provides the application of the composite encapsulated potassium metabisulfite slow-release carrier described in the above technical solution or the composite encapsulated potassium metabisulfite slow-release carrier prepared by the preparation method described in the above technical solution as a wine preservative.

[0071] The present invention does not impose any special limitations on the application method of the composite encapsulated potassium metabisulfite slow-release carrier as a wine preservative; conventional preservative application methods can be used.

[0072] The present invention provides a composite encapsulated potassium metabisulfite slow-release carrier with a dual slow-release effect, which can prolong the release time of sulfur dioxide. Therefore, it can be used as a wine preservative, reducing the frequency of opening the cork for sampling and adding sulfur dioxide, thereby preventing wine spoilage.

[0073] 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.

[0074] The preparation method of passion fruit peel polysaccharide used in this embodiment of the invention is as follows: (1) Pulverize the dried passion fruit peel, pass it through a 40-mesh sieve, soak and stir it for 36 hours with a volume ratio of passion fruit peel powder to petroleum ether of 1:6, then let it stand for 30 minutes, pour off the petroleum ether on top, soak and stir it with a volume ratio of passion fruit peel powder to ethanol solution (95% ethanol) of 1:6, change the ethanol every 6 to 12 hours, soak for 3 days, and dry it to obtain pretreated passion fruit peel powder.

[0075] (2) Weigh 30g of pretreated passion fruit peel powder. Using an ultrasonic-assisted extraction method, extract the powder at 105W and 70℃ for 15 min, followed by centrifugation at 3800rpm for 15 min. Repeat the ultrasonic extraction and centrifugation under the same conditions, discarding the residue. Combine the extracts and concentrate by rotary evaporation at 60℃. Mix the concentrate with 95% ethanol at a volume ratio of 1:4 and let stand at 4℃ for 12 h to precipitate the polysaccharide. Centrifuge at 3800rpm for 15 min, wash the precipitate three times with anhydrous ethanol, evaporate the ethanol, redissolve in water, centrifuge at 8000rpm for 15 min, redissolve the precipitate twice, and freeze-dry the supernatant to obtain passion fruit peel polysaccharide.

[0076] Example 1 A composite encapsulated potassium metabisulfite slow-release carrier comprises potassium metabisulfite, an intermediate layer encapsulating the outer surface of the potassium metabisulfite, and a shell layer encapsulating the outer surface of the intermediate layer. The intermediate layer is a membrane formed of ethyl cellulose. The shell is a membrane obtained by cross-linking passion fruit peel polysaccharide. The mass ratio of the potassium metabisulfite, the intermediate layer, and the shell is 300:15:1200.

[0077] The preparation method of the composite encapsulated potassium metabisulfite sustained-release carrier is as follows: (1) Potassium metabisulfite was mixed with 3.0wt% ethyl cellulose ethanol solution according to the volume ratio of ethyl cellulose solution to potassium metabisulfite of 0.5mL:300mg, dried at 40℃ and then ground to obtain cellulose microparticles encapsulated with potassium metabisulfite. (2) 315 mg of the cellulose microparticles containing potassium metabisulfite were mixed with 40 mL of passion fruit peel polysaccharide solution with a concentration of 3 wt% to obtain a dispersion. The dispersion was then mixed with 40 mL of calcium lactate solution with a concentration of 4 wt% and subjected to a cross-linking reaction at 25 °C for 20 min. The resulting solid was washed three times with deionized water to obtain a composite potassium metabisulfite-containing sustained-release carrier.

[0078] Example 2 A composite encapsulated potassium metabisulfite slow-release carrier comprises potassium metabisulfite, an intermediate layer encapsulating the outer surface of the potassium metabisulfite, and a shell layer encapsulating the outer surface of the intermediate layer. The intermediate layer is a membrane made of cellulose material; The shell is a membrane obtained by cross-linking passion fruit peel polysaccharide. The mass ratio of the potassium metabisulfite, the intermediate layer, and the shell is 300:10:1200.

[0079] The preparation method of the composite encapsulated potassium metabisulfite sustained-release carrier is as follows: (1) Potassium metabisulfite was mixed with 2.0wt% ethyl cellulose ethanol solution according to the volume ratio of ethyl cellulose solution to potassium metabisulfite of 0.5mL:300mg, dried at 40℃ and then ground to obtain cellulose microparticles encapsulated with potassium metabisulfite. (2) 310 mg of the cellulose microparticles containing potassium metabisulfite were mixed with 30 mL of passion fruit peel polysaccharide solution with a concentration of 4 wt% to obtain a dispersion. The dispersion was then mixed with 40 mL of calcium lactate solution with a concentration of 4 wt% and subjected to a cross-linking reaction at 25 °C for 20 min. The resulting solid was washed three times with deionized water to obtain a composite potassium metabisulfite-containing sustained-release carrier.

[0080] Comparative Example 1 A method for preparing a composite-encapsulated potassium metabisulfite sustained-release carrier: 300 mg of potassium metabisulfite was mixed with 40 mL of a 3 wt% passion fruit peel polysaccharide solution by vortexing until dissolved to obtain a mixture. The mixture was then added dropwise to 40 mL of a 4 wt% calcium lactate solution and mixed. A cross-linking reaction was carried out at 25 °C for 20 min. The resulting solid was washed three times with deionized water to obtain the composite-encapsulated potassium metabisulfite sustained-release carrier.

[0081] Test case (1) The composite encapsulated potassium metabisulfite sustained-release carriers prepared in Examples 1-2 and Comparative Example 1 were tested respectively, and the encapsulation efficiency results are shown in Table 1: Table 1. Encapsulation efficiency of the composite encapsulated potassium metabisulfite sustained-release carriers prepared in the examples and comparative examples.

[0082] As can be seen from Table 1, the encapsulation rates of Examples 1 and 2 are similar, but significantly higher than those of Comparative Example 1, indicating that the ethyl cellulose coating effectively prevents the leakage of potassium metabisulfite and improves the encapsulation rate.

[0083] (2) The release rate curves of the composite encapsulated potassium metabisulfite sustained-release carriers prepared in Examples 1, 2, and 1 are shown below. Figure 1 As shown.

[0084] from Figure 1 It can be seen that the release curves of Example 1 and Example 2 are similar, with sulfur dioxide being released slowly in wine; Comparative Example 1 omitted the ethyl cellulose coating step, and the passion fruit peel polysaccharide shell swelled and released sulfur dioxide in a short time, which reduced the slow-release performance of the product.

[0085] (3) The surface and cross-sectional morphology of the composite potassium metabisulfite-encapsulated slow-release carriers prepared in Example 1 and Comparative Example 1 are shown in the scanning electron microscope images. Figure 2 As shown.

[0086] from Figure 2It can be seen that the surface morphology of the composite encapsulated potassium metabisulfite slow-release carriers prepared in Example 1 and Comparative Example 1 is similar, both being close to spherical; the cross-sectional morphology of both shows a loose and porous state, and the internal structure of Example 1 is more compact than that of the comparative example, which is more conducive to its slow release of sulfur dioxide in wine.

[0087] The results above show that the composite potassium metabisulfite-encapsulated slow-release carrier prepared by the method provided in this invention can significantly improve the slow-release effect of sulfur dioxide. This enables the composite potassium metabisulfite-encapsulated slow-release carrier to reduce the frequency of opening the cork for sampling and adding sulfur dioxide when used as a wine preservative, thereby preventing wine spoilage.

[0088] 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 sustained-release carrier for composite encapsulating potassium metabisulfite, characterized in that, It includes potassium metabisulfite, an intermediate layer wrapped around the outer surface of the potassium metabisulfite, and a shell layer wrapped around the outer surface of the intermediate layer; The intermediate layer is a membrane made of cellulose material; The shell is made of passion fruit peel polysaccharide through a cross-linking reaction.

2. The sustained-release carrier for composite encapsulated potassium metabisulfite according to claim 1, characterized in that, The cellulose material includes one or more of ethyl cellulose, cellulose acetate propionate, methyl cellulose, and hydroxypropyl methyl cellulose.

3. The sustained-release carrier for composite encapsulated potassium metabisulfite according to claim 1, characterized in that, The mass ratio of the potassium metabisulfite, the intermediate layer, and the shell is (150~300):(5~15):(600~1200).

4. The sustained-release carrier for composite encapsulated potassium metabisulfite according to claim 1, characterized in that, The particle size of the slow-release carrier for the composite encapsulated potassium metabisulfite is 3-5 mm.

5. A method for preparing the composite encapsulated potassium metabisulfite sustained-release carrier according to any one of claims 1 to 4, comprising the following steps: Potassium metabisulfite was mixed with a cellulose material solution and dried to obtain cellulose microparticles encapsulated with potassium metabisulfite. The cellulose microparticles encapsulated with potassium metabisulfite were mixed with a passion fruit peel polysaccharide solution to obtain a dispersion; the dispersion was then mixed with a soluble calcium salt solution to carry out a cross-linking reaction, thereby obtaining a composite sustained-release carrier encapsulated with potassium metabisulfite.

6. The preparation method according to claim 5, characterized in that, The concentration of the cellulose material solution is 1.0~3.0 wt%.

7. The preparation method according to claim 6, characterized in that, The volume ratio of the cellulose material solution to the mass ratio of potassium metabisulfite is 0.5 mL: 150~300 mg.

8. The preparation method according to claim 5, characterized in that, The concentration of the passion fruit peel polysaccharide solution is 2.0~4.0 wt%.

9. The preparation method according to claim 5, characterized in that, The cross-linking reaction is carried out at a temperature of 20-35°C for 20-30 minutes.

10. The application of the composite encapsulated potassium metabisulfite slow-release carrier according to any one of claims 1 to 4 or the composite encapsulated potassium metabisulfite slow-release carrier prepared by the preparation method according to any one of claims 5 to 9 as a wine preservative.

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