Preparation process and application of rock sugar syrup

Abstract

The invention provides a preparation process and application of rock sugar syrup, and belongs to the technical field of food production and processing. The purified high fructose corn syrup, purified mogroside and other high-purity components are used, the impurity content in the rock candy syrup raw materials is reduced, modified activated carbon is matched for adsorption treatment, the ash content of the rock candy syrup is reduced through the comprehensive effect, and meanwhile the light transmittance of the syrup is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of food production and processing, and in particular relates to a preparation process of rock sugar syrup and application thereof. Background Art

[0002] Rock sugar syrup has a history of hundreds of years. It has the effects of clearing away heat and detoxification, promoting the production of body fluids and quenching thirst, clearing the liver and improving eyesight. Its production process is simple, the raw materials are ordinary, and it is easy to crystallize during storage. The sweetness of rock sugar syrup is pure, refreshing and not greasy. It is often used in fresh fruit tea to enhance the aroma of tea and fruit and the freshness of fruit. It can also be paired with lemon juice, black tea powder, etc. It is called a flavoring agent for other fruit juices and is very popular.

[0003] Existing rock sugar syrup contains low-purity components such as fructose syrup, which easily leads to a decrease in the light transmittance of the rock sugar syrup product. At the same time, the adsorption effect of some activated carbons is poor, which will cause an increase in the ash content. The invention patent (publication number CN116530666A) discloses a rock sugar syrup and a preparation method thereof. The rock sugar syrup prepared by the present invention has high thermal stability and will not cause acid reflux when used in hot drinks; at the same time, it can reduce the absorption of sucrose in the body and inhibit the increase of blood sugar. However, there are still problems such as the decrease in light transmittance caused by raw material impurities in sucrose syrup, and the high ash content caused by poor adsorption and impurity removal effect in the preparation process, which cannot meet the needs of the existing market.

[0004] Therefore, there is an urgent need for a preparation process for rock sugar syrup that can purify the raw materials to improve the light transmittance of the syrup; at the same time, improve the adsorption and impurity removal efficiency and reduce the ash content of the syrup product. Summary of the invention

[0005] The object of the present invention is to provide a preparation process and application of rock sugar syrup, by using purified fructose syrup, purified mogroside and other high-purity components, reducing the impurity content in the rock sugar syrup raw material, and combining with modified activated carbon for adsorption treatment, the ash content of the rock sugar syrup is reduced by comprehensive effect, and the light transmittance of the syrup is improved.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a process for preparing rock sugar syrup, comprising the following steps:

[0008] Step S1: weighing 40 to 55 parts of fructose syrup, 20 to 30 parts of white sugar, 12 to 20 parts of crystal sugar, 3 to 4 parts of L-arabinose and 0.02 to 0.05 parts of mogroside in parts by weight, and mixing them uniformly to obtain a mixed solution;

[0009] Step S2: firstly adsorbing the mixed solution in step S1 using activated carbon, and then filtering it using an ultrafiltration membrane to obtain a primary syrup;

[0010] Step S3: sterilizing, cooling and filling the initial syrup in step S2 to obtain rock sugar syrup.

[0011] As a preferred solution, the fructose-glucose syrup described in step S1 is purified fructose-glucose syrup; the method for preparing the purified fructose-glucose syrup comprises: subjecting the fructose-glucose syrup to clarification treatment through a clarification membrane to obtain clarified fructose-glucose syrup; and subjecting the clarified fructose-glucose syrup to decolorization treatment through a decolorization membrane to obtain purified fructose-glucose syrup.

[0012] As a preferred scheme, the preparation method of the clarifying membrane includes: adding 10 to 20 parts of polyvinyl alcohol to 100 to 120 parts of deionized water by weight, stirring evenly, adding 2 to 4 parts of mesoporous material, and stirring for 1 to 2 hours to obtain a suspension; electrospinning the suspension to obtain an electrospun fiber membrane, drying at 50 to 60°C for 6 to 8 hours to obtain a clarifying membrane.

[0013] As a preferred scheme, the preparation method of the mesoporous material includes: in parts by weight, mixing 100 to 120 parts of anhydrous ethanol and 20 to 30 parts of deionized water to obtain a mixed solution, weighing 0.2 to 0.4 parts of ferrosoferric oxide and adding it to the mixed solution, ultrasonically dispersing for 1 to 2 hours, and then dropping 2 to 4 parts of tetraethyl silicate and 3 to 5 parts of ammonia water into the suspension, reacting for 8 to 10 hours under stirring at room temperature, and then washing with deionized water three times to obtain composite particles, and drying the composite particles in a vacuum oven at 50 to 60°C for 10 to 12 hours to obtain the mesoporous material.

[0014] As a preferred solution, the syringe propulsion speed of the electrospinning is 0.1-0.3 mL / h, the needle voltage is 18-25 kV, the receiving distance is 15-18 cm, the temperature is 30-40° C., the humidity is 35-45%, and the spinning time is 1-2 h.

[0015] As a preferred solution, the decolorization membrane is a polyamide hollow fiber membrane with a pore size of 0.45 to 0.55 μm; the temperature of the decolorization treatment is 50 to 60° C. and the pressure is 1 to 2 MPa.

[0016] The clarification membrane for purifying high fructose syrup is composed of an electrospun fiber membrane. Polyvinyl alcohol with good biocompatibility is used as the main material, and mesoporous materials are added for modification. Silicon dioxide as the surface layer of the mesoporous material has a high specific surface area and good adsorption properties, which can effectively adsorb impurities; and the core layer of the mesoporous material is magnetic ferrosoferric oxide, which can effectively adsorb trace metal elements contained in the raw materials themselves or introduced during the processing process, thereby reducing the impurity content and increasing the transmittance of the syrup product.

[0017] As a preferred scheme, the mogroside described in step S1 is purified mogroside; the preparation method of purified mogroside comprises: adding 15 to 20 parts of commercially available mogroside to 100 to 120 parts of deionized water by weight, stirring and dissolving to obtain a mogroside mother liquor; adding 0.1 to 0.2 parts of hydrogen peroxide solution to the mogroside mother liquor for impurity removal treatment, and then performing deacidification treatment with an anion resin after the impurity removal treatment is completed to obtain a purified solution, and drying the purified solution to obtain purified mogroside.

[0018] As a preferred solution, the treatment temperature of the impurity removal treatment is 50-60° C. and the treatment time is 4-6 hours.

[0019] The mother liquor of mogroside is oxidized by using hydrogen peroxide to remove impurities in commercially available mogroside, and the temperature and time of the impurity removal treatment are controlled to ensure that the hydrogen peroxide fully reacts and decomposes. After the hydrogen peroxide is decomposed, water and oxygen are produced, and no new impurities are introduced. In addition, the mother liquor of mogroside is deacidified by using an anion resin to further reduce other impurities, thereby ensuring the high purity of the mogroside of the present invention, thereby reducing the ash content in the final syrup.

[0020] As a preferred scheme, the activated carbon in step S2 is modified activated carbon; the preparation method of the modified activated carbon comprises: adding 10 to 20 parts of activated carbon by weight to 100 to 120 parts of anhydrous ethanol, ultrasonically vibrating for 2 to 4 minutes, drying the filter residue after filtering, placing it in a glass reactor, placing the glass reactor in a microwave, and microwave-treating it at a power of 400 to 500 W for 5 to 10 minutes under nitrogen protection to obtain microwave-modified activated carbon; adding 10 to 15 parts of the microwave-modified activated carbon to 50 to 60 parts of hydrogen peroxide solution and immersing it for 1 to 2 hours, filtering after the immersion is completed, and drying the filter cake at 105 to 110° C. for 16 to 18 hours to obtain modified activated carbon.

[0021] The modified activated carbon is first treated with microwave modification, which can make its specific surface area and pore diameter reach a better state, while increasing the micropore volume and improving the adsorption capacity; it is then modified with hydrogen peroxide to introduce functional groups such as carboxyl and hydroxyl, which can better adsorb particles and impurities in the syrup, thereby reducing the ash content of the syrup.

[0022] The second aspect of the present invention provides an application of rock sugar syrup prepared by the preparation process described in the first aspect in food and beverage.

[0023] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0024] 1. The present invention purifies fructose-glucose syrup, wherein a clarification membrane for clarification treatment is composed of an electrospun fiber membrane, polyvinyl alcohol with good biocompatibility is used as the main material, and a mesoporous material is added for modification, wherein silicon dioxide as the surface layer of the mesoporous material has a high specific surface area and good adsorption performance, and can effectively adsorb impurities; and the core layer of the mesoporous material is magnetic ferroferric oxide, which can effectively adsorb trace metal elements contained in the raw materials themselves or introduced during the processing, thereby reducing the impurity content and improving the light transmittance of the syrup product.

[0025] 2. The present invention uses hydrogen peroxide to perform oxidation treatment on the mother liquor of mogroside to remove impurities in commercially available mogroside, and controls the temperature and time of the impurity removal treatment to ensure that the hydrogen peroxide fully reacts and decomposes. After the hydrogen peroxide decomposes, water and oxygen are produced, and no new impurities are introduced. In addition, deacidification treatment is performed by an anion resin to further reduce other impurities in the mother liquor of mogroside, thereby ensuring the high purity of the mogroside of the present invention, thereby reducing the ash content in the final syrup.

[0026] 3. The present invention uses modified activated carbon to carry out adsorption treatment on the syrup. The modified activated carbon is first subjected to microwave modification treatment, which can make its specific surface area and diameter of pores reach a better state, while increasing the micropore volume and improving the adsorption capacity; then it is modified with hydrogen peroxide to introduce functional groups such as carboxyl and hydroxyl, which can better adsorb particles and impurities in the syrup, thereby reducing the ash content of the syrup. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The sources of some components in the embodiments and comparative examples are as follows:

[0029] Fructose corn syrup, product number F55 M01003, purchased from Shanghai Lianwei Trading Co., Ltd.;

[0030] Polyvinyl alcohol, product number P815725-500g, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0031] Anhydrous ethanol, CAS No. 64-17-5, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0032] Ferroferric oxide, CAS No. 12227-89-3; purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0033] Tetraethyl silicate, product number T819505, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0034] Ammonia, CAS No. 1336-21-6; purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0035] White sugar, product number BST125, was purchased from Jinan Jinhuafang Food Technology Co., Ltd.;

[0036] Rock sugar, product number 4258041, Nanjing Ganzhiyuan Co., Ltd.;

[0037] L-arabinose, product number A610071-0100, was purchased from Sangon Biotechnology (Shanghai) Co., Ltd.;

[0038] Commercially available mogroside, product number DL0025, was purchased from Beijing Inokai Technology Co., Ltd.;

[0039] Hydrogen peroxide solution, product number XF080H433856, 30% by weight, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0040] Anionic resin, product number LXPC-958, was purchased from Xi'an Lanxiao Technology New Materials Co., Ltd.;

[0041] Activated carbon, product number I11113, was purchased from Beijing Inokai Technology Co., Ltd.;

[0042] The polyamide hollow fiber membrane is prepared according to the method of the Chinese patent "A corrosion-resistant polyamide hollow fiber membrane and its preparation method, publication number CN102808235A";

[0043] Ultrafiltration membrane, product number UOF-4, was purchased from Tianjin Motian Membrane Engineering Technology Co., Ltd.

[0044] Example 1

[0045] This embodiment provides a process for preparing rock sugar syrup, comprising the following steps:

[0046] Preparation of purified fructose syrup: (1) By weight, 120 parts of anhydrous ethanol and 30 parts of deionized water were mixed to obtain a mixed solution, 0.4 parts of ferroferric oxide was weighed and added to the mixed solution, ultrasonically dispersed for 2 hours, and then 4 parts of tetraethyl silicate and 5 parts of ammonia water were dropped into the suspension, stirred at room temperature for 10 hours, and then washed with deionized water 3 times to obtain composite particles, and the composite particles were dried in a vacuum oven at 60°C for 10 hours to obtain a mesoporous material. (2) By weight, 20 parts of polyvinyl alcohol were added to 120 parts of deionized water, stirred evenly, and then 4 parts of mesoporous material were added, stirred for 2 hours to obtain a suspension; the suspension was electrospun (the syringe propulsion speed of electrospinning was 0.3 mL / h, the needle voltage was 25 kV, the receiving distance was 18 cm, the temperature was 40°C, the humidity was 35%, and the spinning time was 1 hour) to obtain an electrospun fiber membrane, which was dried at 60°C for 6 hours to obtain a clear membrane. (3) The fructose-glucose syrup is clarified by passing it through a clarification membrane at a temperature of 60° C. and a pressure of 1 MPa to obtain clarified fructose syrup; the clarified fructose syrup is decolorized by passing it through a decolorization membrane (the decolorization membrane is a polyamide hollow fiber membrane with a pore size of 0.55 μm) (the decolorization temperature is 60° C. and the pressure is 1 MPa) to obtain purified fructose syrup.

[0047] Preparation of purified mogroside: by weight, 20 parts of commercially available mogroside are added to 120 parts of deionized water, and stirred to dissolve to obtain a mogroside mother liquor; 0.2 parts of hydrogen peroxide solution (30%wt) is added to the mogroside mother liquor for impurity removal treatment (treatment temperature is 60°C; treatment time is 4h), and after the impurity removal treatment is completed, an anion resin is used for deacidification treatment to obtain a purified solution, and the purified solution is dried to obtain purified mogroside.

[0048] Preparation of modified activated carbon: By weight, 20 parts of activated carbon are added to 120 parts of anhydrous ethanol, ultrasonically vibrated for 4 minutes, filtered, dried the filter residue, placed in a glass reactor, placed the glass reactor in a microwave, and microwaved at 500 W for 5 minutes under nitrogen protection to obtain microwave-modified activated carbon; 15 parts of microwave-modified activated carbon are added to 60 parts of hydrogen peroxide solution (30% wt) and immersed for 2 hours. After the immersion is completed, suction filtration is performed, and the filter cake is dried at 110°C for 16 hours to obtain modified activated carbon.

[0049] Step S1: weigh 55 parts of purified fructose syrup, 30 parts of white sugar, 20 parts of crystal sugar, 4 parts of L-arabinose and 0.05 parts of purified mogroside in parts by weight, and mix them evenly to obtain a mixed solution;

[0050] Step S2: Under the conditions of a temperature of 65° C. and a pressure of 1.5 MPa, the mixed solution in step S1 is first subjected to adsorption treatment using modified activated carbon, and then subjected to filtration treatment using an ultrafiltration membrane to obtain a primary syrup;

[0051] Step S3: sterilizing, cooling and filling the initial syrup in step S2 to obtain rock sugar syrup.

[0052] Example 2

[0053] This embodiment provides a process for preparing rock sugar syrup, comprising the following steps:

[0054] Preparation of purified fructose syrup: (1) By weight, 100 parts of anhydrous ethanol and 20 parts of deionized water were mixed to obtain a mixed solution, 0.2 parts of ferroferric oxide was weighed and added to the mixed solution, and ultrasonic dispersion was performed for 1 hour, then 2 parts of tetraethyl silicate and 3 parts of ammonia water were dropped into the suspension, and the mixture was stirred at room temperature for 8 hours, and then washed with deionized water for 3 times to obtain composite particles, and the composite particles were dried in a vacuum oven at 50°C for 12 hours to obtain a mesoporous material. (2) By weight, 10 parts of polyvinyl alcohol were added to 100 parts of deionized water, stirred evenly, and then 2 parts of mesoporous material were added, and stirred for 1 hour to obtain a suspension; the suspension was electrospun (the syringe propulsion speed of electrospinning was 0.1 mL / h, the needle voltage was 18 kV, the receiving distance was 15 cm, the temperature was 30°C, the humidity was 45%, and the spinning time was 2 hours) to obtain an electrospun fiber membrane, which was dried at 50°C for 8 hours to obtain a clear membrane. (3) The fructose-glucose syrup is clarified by passing it through a clarification membrane at a temperature of 60° C. and a pressure of 1 MPa to obtain clarified fructose syrup; the clarified fructose syrup is decolorized by passing it through a decolorization membrane (the decolorization membrane is a polyamide hollow fiber membrane with a pore size of 0.45 μm) (the decolorization temperature is 50° C. and the pressure is 2 MPa) to obtain purified fructose syrup.

[0055] Preparation of purified mogroside: by weight, 15 parts of commercially available mogroside are added to 100 parts of deionized water, and stirred to dissolve to obtain a mogroside mother liquor; 0.1 parts of hydrogen peroxide solution (30%wt) is added to the mogroside mother liquor for impurity removal treatment (treatment temperature is 50°C; treatment time is 6h), and after the impurity removal treatment is completed, an anion resin is used for deacidification treatment to obtain a purified solution, and the purified solution is dried to obtain purified mogroside.

[0056] Preparation of modified activated carbon: By weight, 10 parts of activated carbon are added to 100 parts of anhydrous ethanol, ultrasonically vibrated for 2 minutes, filtered, dried, and placed in a glass reactor. The glass reactor is placed in a microwave, and microwaved at 400 W for 10 minutes under nitrogen protection to obtain microwave-modified activated carbon; 10 parts of the microwave-modified activated carbon are added to 50 parts of hydrogen peroxide solution (30% wt) and immersed for 1 hour. After the immersion is completed, suction filtration is performed, and the filter cake is dried at 105° C. for 18 hours to obtain modified activated carbon.

[0057] Step S1: weigh 40 parts of purified fructose syrup, 20 parts of white sugar, 12 parts of crystal sugar, 3 parts of L-arabinose and 0.02 parts of purified mogroside in parts by weight, and mix them evenly to obtain a mixed solution;

[0058] Step S2: Under the conditions of a temperature of 65° C. and a pressure of 1.5 MPa, the mixed solution in step S1 is first subjected to adsorption treatment using modified activated carbon, and then subjected to filtration treatment using an ultrafiltration membrane to obtain a primary syrup;

[0059] Step S3: sterilizing, cooling and filling the initial syrup in step S2 to obtain rock sugar syrup.

[0060] Example 3

[0061] This embodiment provides a process for preparing rock sugar syrup, comprising the following steps:

[0062] Preparation of purified fructose syrup: (1) By weight, 110 parts of anhydrous ethanol and 25 parts of deionized water were mixed to obtain a mixed solution, 0.3 parts of ferroferric oxide was weighed and added to the mixed solution, ultrasonically dispersed for 2 hours, and then 3 parts of tetraethyl silicate and 4 parts of ammonia water were dropped into the suspension, stirred at room temperature for 9 hours, and then washed with deionized water 3 times to obtain composite particles, and the composite particles were dried in a vacuum oven at 58°C for 11 hours to obtain a mesoporous material. (2) By weight, 18 parts of polyvinyl alcohol were added to 115 parts of deionized water, stirred evenly, and then 3 parts of mesoporous material were added, stirred for 2 hours to obtain a suspension; the suspension was electrospun (the syringe propulsion speed of electrospinning was 0.2 mL / h, the needle voltage was 20 kV, the receiving distance was 16 cm, the temperature was 35°C, the humidity was 40%, and the spinning time was 2 hours) to obtain an electrospun fiber membrane, which was dried at 58°C for 7 hours to obtain a clear membrane. (3) The fructose-glucose syrup is clarified by passing it through a clarification membrane at a temperature of 60° C. and a pressure of 1 MPa to obtain clarified fructose syrup; the clarified fructose syrup is decolorized by passing it through a decolorization membrane (the decolorization membrane is a polyamide hollow fiber membrane with a pore size of 0.50 μm) (the decolorization temperature is 56° C. and the pressure is 2 MPa) to obtain purified fructose syrup.

[0063] Preparation of purified mogroside: by weight, 18 parts of commercially available mogroside are added to 110 parts of deionized water, stirred and dissolved to obtain a mogroside mother liquor; 0.1 parts of hydrogen peroxide solution (30%wt) is added to the mogroside mother liquor for impurity removal treatment (treatment temperature is 58°C; treatment time is 5h), and after the impurity removal treatment is completed, an anion resin is used for deacidification treatment to obtain a purified solution, and the purified solution is dried to obtain purified mogroside.

[0064] Preparation of modified activated carbon: By weight, 18 parts of activated carbon are added to 110 parts of anhydrous ethanol, ultrasonically vibrated for 3 minutes, filtered, dried, and placed in a glass reactor. The glass reactor is placed in a microwave, and microwaved at 500 W for 8 minutes under nitrogen protection to obtain microwave-modified activated carbon; 12 parts of the microwave-modified activated carbon are added to 58 parts of hydrogen peroxide solution (30% wt) and immersed for 2 hours. After the immersion is completed, suction filtration is performed, and the filter cake is dried at 108° C. for 17 hours to obtain modified activated carbon.

[0065] Step S1: weigh 50 parts of fructose syrup, 25 parts of white sugar, 15 parts of crystal sugar, 4 parts of L-arabinose and 0.04 parts of purified mogroside in parts by weight, and mix them evenly to obtain a mixed solution;

[0066] Step S2: Under the conditions of a temperature of 65° C. and a pressure of 1.5 MPa, the mixed solution in step S1 is first subjected to adsorption treatment using modified activated carbon, and then subjected to filtration treatment using an ultrafiltration membrane to obtain a primary syrup;

[0067] Step S3: sterilizing, cooling and filling the initial syrup in step S2 to obtain rock sugar syrup.

[0068] Comparative Example 1

[0069] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available high fructose corn syrup is used instead of purified high fructose corn syrup, commercially available mogroside is used instead of purified mogroside, and commercially available activated carbon is used instead of modified activated carbon. The rest is the same as Example 1.

[0070] Comparative Example 2

[0071] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available mogroside is used instead of purified mogroside, and commercially available activated carbon is used instead of modified activated carbon. The rest is the same as Example 1.

[0072] Comparative Example 3

[0073] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available high fructose corn syrup is used instead of purified high fructose corn syrup, and commercially available activated carbon is used instead of modified activated carbon. The rest is the same as Example 1.

[0074] Comparative Example 4

[0075] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available high fructose corn syrup is used instead of purified high fructose corn syrup, and commercially available mogroside is used instead of purified mogroside. The rest is the same as Example 1.

[0076] Comparative Example 5

[0077] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available high fructose corn syrup is used instead of purified high fructose corn syrup, and the rest is the same as Example 1.

[0078] Comparative Example 6

[0079] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available mogroside is used instead of purified mogroside, and the rest is the same as Example 1.

[0080] Comparative Example 7

[0081] This comparative example provides a preparation process of rock sugar syrup. The difference between this comparative example and Example 1 is that commercially available activated carbon is used instead of modified activated carbon, and the rest is the same as Example 1.

[0082] Performance Testing

[0083] The rock sugar syrups prepared in the above examples and comparative examples were subjected to the following tests:

[0084] Ash content test: Test in accordance with the requirements of "QB / T 4093-2023".

[0085] Light transmittance test: Test in accordance with the requirements of GBT 20882.4-2021.

[0086] Table 1 Performance test results

[0087]

[0088]

[0089] It can be seen from the above performance test results that the rock sugar syrups of Examples 1-3 have good effects, especially Example 1 has the most outstanding comprehensive performance, with an ash content of 0.0087% and a transmittance of 97.54%. This is mainly because it uses high-purity components such as purified fructose syrup and purified mogroside to reduce the impurity content in the rock sugar syrup raw material, and cooperates with modified activated carbon for adsorption treatment. The comprehensive effect reduces the ash content of the rock sugar syrup and improves the transmittance of the syrup.

[0090] The comparative examples, however, were significantly inferior to the examples in the corresponding performance tests because they did not adopt the necessary technical solutions. Compared with Example 1, in Comparative Example 1, commercially available high fructose corn syrup was used instead of purified high fructose corn syrup, commercially available mogroside was used instead of purified mogroside, and commercially available activated carbon was used instead of modified activated carbon, so the ash content was increased and the transmittance was decreased; compared with Example 1, in Comparative Example 2, commercially available mogroside was used instead of purified mogroside, and commercially available activated carbon was used instead of modified activated carbon, so the ash content was increased; compared with Example 1, in Comparative Example 3, commercially available high fructose corn syrup was used instead of purified high fructose corn syrup. , using commercially available activated carbon instead of modified activated carbon, the ash content is increased and the transmittance is reduced; compared with Example 1, Comparative Example 4 uses commercially available fructose syrup instead of purified fructose syrup, and uses commercially available mogroside instead of purified mogroside, the ash content is increased and the transmittance is reduced; compared with Example 1, Comparative Example 5 uses commercially available fructose syrup instead of purified fructose syrup, and the transmittance is reduced; compared with Example 1, Comparative Example 6 uses commercially available mogroside instead of purified mogroside, and the ash content is increased; compared with Example 1, Comparative Example 7 uses commercially available activated carbon instead of modified activated carbon, and the ash content is increased. The above experimental results further prove the importance of the technical scheme defined in the present invention for its technical effect.

[0091] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A process for preparing rock sugar syrup, characterized in that: The steps include: Step S1: weighing 40 to 55 parts of fructose syrup, 20 to 30 parts of white sugar, 12 to 20 parts of crystal sugar, 3 to 4 parts of L-arabinose and 0.02 to 0.05 parts of mogroside in parts by weight, and mixing them uniformly to obtain a mixed solution; Step S2: firstly adsorbing the mixed solution in step S1 using activated carbon, and then filtering it using an ultrafiltration membrane to obtain a primary syrup; Step S3: sterilizing, cooling and filling the initial syrup in step S2 to obtain rock sugar syrup.

2. The process for preparing rock sugar syrup according to claim 1, characterized in that: The fructose-glucose syrup described in step S1 is purified fructose-glucose syrup; the preparation method of the purified fructose-glucose syrup comprises: subjecting the fructose-glucose syrup to clarification treatment through a clarification membrane to obtain clarified fructose-glucose syrup; and subjecting the clarified fructose-glucose syrup to decolorization treatment through a decolorization membrane to obtain purified fructose-glucose syrup.

3. The process for preparing rock sugar syrup according to claim 2, characterized in that: The preparation method of the clarified membrane comprises: adding 10 to 20 parts of polyvinyl alcohol to 100 to 120 parts of deionized water by weight, stirring evenly, adding 2 to 4 parts of mesoporous material, stirring for 1 to 2 hours to obtain a suspension; electrostatically spinning the suspension to obtain an electrostatically spun fiber membrane, drying at 50 to 60° C. for 6 to 8 hours to obtain a clarified membrane.

4. The process for preparing rock sugar syrup according to claim 3, characterized in that: The preparation method of the mesoporous material comprises: in parts by weight, mixing 100 to 120 parts of anhydrous ethanol and 20 to 30 parts of deionized water to obtain a mixed solution, weighing 0.2 to 0.4 parts of ferrosoferric oxide and adding it to the mixed solution, ultrasonically dispersing for 1 to 2 hours, then dropping 2 to 4 parts of tetraethyl silicate and 3 to 5 parts of ammonia water into the suspension, reacting for 8 to 10 hours under stirring at room temperature, then washing with deionized water for 3 times to obtain composite particles, and drying the composite particles in a vacuum oven at 50 to 60° C. for 10 to 12 hours to obtain the mesoporous material.

5. The process for preparing rock sugar syrup according to claim 3, characterized in that: The electrostatic spinning syringe advancing speed is 0.1-0.3 mL / h, the needle voltage is 18-25 kV, the receiving distance is 15-18 cm, the temperature is 30-40° C., the humidity is 35-45%, and the spinning time is 1-2 h.

6. The process for preparing rock sugar syrup according to claim 2, characterized in that: The decolorizing membrane is a polyamide hollow fiber membrane with a pore size of 0.45 to 0.55 μm; the decolorizing treatment temperature is 50 to 60° C. and the pressure is 1 to 2 MPa.

7. The process for preparing rock sugar syrup according to claim 1, characterized in that: The mogroside described in step S1 is purified mogroside; the preparation method of purified mogroside comprises: adding 15 to 20 parts of commercially available mogroside to 100 to 120 parts of deionized water by weight, stirring and dissolving to obtain a mogroside mother liquor; adding 0.1 to 0.2 parts of hydrogen peroxide solution to the mogroside mother liquor for impurity removal treatment, and then using an anion resin for deacidification treatment after the impurity removal treatment is completed to obtain a purified solution, and drying the purified solution to obtain purified mogroside.

8. The process for preparing rock sugar syrup according to claim 7, characterized in that: The treatment temperature of the impurity removal treatment is 50-60° C. and the treatment time is 4-6 hours.

9. The process for preparing rock sugar syrup according to claim 1, characterized in that: The activated carbon in step S2 is modified activated carbon; The preparation method of the modified activated carbon comprises: adding 10 to 20 parts of activated carbon to 100 to 120 parts of anhydrous ethanol by weight, ultrasonically vibrating for 2 to 4 minutes, filtering and drying the filter residue, placing it in a glass reactor, placing the glass reactor in a microwave, and microwave-treating it at a power of 400 to 500 W for 5 to 10 minutes under nitrogen protection to obtain microwave-modified activated carbon; 10 to 15 parts of the microwave-modified activated carbon are added to 50 to 60 parts of hydrogen peroxide solution and immersed for 1 to 2 hours. After the immersion is completed, suction filtration is performed, and the filter cake is dried at 105 to 110° C. for 16 to 18 hours to obtain modified activated carbon.

10. Use of the rock sugar syrup prepared by the preparation process according to any one of claims 1 to 9 in food and beverages.

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