Method for preparing cold-soluble instant ampelopsis grossedentata powder through double-effect extraction

Abstract

The invention provides a method for preparing cold-soluble instant ampelopsis grossedentata powder through double-effect extraction. The method comprises the steps of raw material treatment, double-effect extraction, filtration, settling separation, concentration, blending, sterilization, drying and the like. According to the method, the selectivity of the raw materials is wider, and the cost is reduced while the yield is increased; compared with the traditional process, the process flow is more convenient and faster, the product form and flavor characteristics are richer and more diversified, the raw material utilization rate is higher, and the production energy consumption is lower. The two products can be quickly cold-dissolved at normal temperature, so that the brewing convenience is greatly improved; by adding a certain proportion of beta-cyclodextrine and maltodextrin, substances easy to separate out can be effectively embedded, so that the solubility of the instant ampelopsis grossedentata powder is greatly improved; the two instant ampelopsis grossedentata powder have excellent cold dissolving effects, the content of dihydromyricetin in the two instant ampelopsis grossedentata powder is greater than 25%, and the instant ampelopsis grossedentata powder has an effective health-care function.

Description

Technical Field

[0001] The invention relates to the technical field of rattan tea deep processing, and in particular to a method for preparing cold-soluble instant rattan tea powder through double-effect extraction. Background Art

[0002] Vine tea, commonly known as Dragon Boat Festival tea, Teng Po tea (also known as mountain sweet tea, dragon beard tea), is the tender stems and leaves of Ampelopsis grossedentata (Hand-Mazz) WTwang. The English name is Vine tea. It mainly grows in the mountainous areas of Jiangnan, China. It is a woody vine with no hair on the whole plant. The tendrils are bifurcated and can be up to 12 cm long. The leaves are pinnate, up to 21cm long, with 9 to 15 leaflets, and the lowest pinna has 3 leaflets; the leaves at the top of the branches are pinnate; the leaflets are herbaceous or thin papery, oblong, ovate, rhombus-narrow ovate or lanceolate, 2.5 to 7cm long, 1 to 3cm wide, gradually pointed or acute at the top, cuneate or broad cuneate at the base, with coarse serrations on the edges, green above, light green below, and slightly purple-red on young leaves; the petiole is 1.5 to 3cm long, the leaves on the upper branches are almost sessile, the terminal leaflets are petiolate, and the lateral leaflets are sessile and slightly oblique. The flowering period is from June to September, the fruiting period is from July to November, and the harvesting time is from April to August.

[0003] Rattan tea is not only a natural green drink, but also a tea with strong health care properties. It contains protein, dietary fiber, fat, carotene, vitamins and trace elements such as iron, zinc, calcium, magnesium, potassium and sodium required by the human body. Studies have shown that dihydromyricetin, the main active ingredient in rattan tea, has multiple functions such as scavenging free radicals, anti-oxidation, anti-thrombosis, anti-tumor, anti-inflammatory, lowering blood sugar and blood lipids. Its content varies in different mountain ranges, generally between 6% and 39%. The tea made from the stems and leaves of rattan tea is green with white frost; it feels slightly bitter and sweet when drinking, and it can quench thirst; it tastes sweet and cool, has the effects of clearing heat and detoxification and antibacterial and anti-inflammatory. When the tea is drunk for a long time, it is beneficial to human health.

[0004] However, drinking rattan tea by the traditional brewing method has many inconveniences, especially for office workers, it is difficult to find the conditions for brewing with tea sets. Therefore, instant rattan tea powder products have also appeared, so that users can quickly brew with water for drinking. The current rattan tea powder preparation process mainly includes the steps of raw material preparation, withering and kneading, drying and screening, fermentation treatment, drying and crushing, extraction and concentration. Although this process can prepare instant rattan tea powder, it also still has certain shortcomings, especially its whole process is relatively cumbersome, needs to consume a lot of time and labor, and is not conducive to industrial large-scale production. In addition, the instant rattan tea powder currently produced needs to be brewed in hot water close to boiling for a certain time before it can be dissolved, which is also not conducive to rapid drinking, so a rattan tea powder production method that is more convenient for production and drinking is needed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for preparing cold-soluble instant rattan tea powder by double-effect extraction, which solves the problems in the prior art that the production process is relatively complicated, which is not conducive to industrial large-scale production, and the powder needs to be brewed in hot water close to boiling water to be dissolved, which is not conducive to rapid drinking.

[0006] According to an embodiment of the present invention, a method for preparing cold-soluble instant rattan tea powder by double-effect extraction comprises the following steps:

[0007] S1. Raw material processing: drying and crushing the rattan tea raw materials;

[0008] S2, double-effect extraction: extract the rattan tea raw material in a solvent at a mass ratio of 1:8-1:13 at a temperature of 20-25°C for 30-60 minutes to obtain extract A; then extract it at a solvent mass ratio of 1:11-1:13 and 1:5-1:7 at a temperature of 85°C for 30 minutes each to obtain extracts B and C;

[0009] S3, filtration: using a centrifuge to filter the extracts A, B, and C respectively to obtain filtrates A, B, and C;

[0010] S4, sedimentation separation: Mix the filtrate B and C, place in a cooling barrel at less than 15°C, cool for 6 hours, and separate the supernatant D;

[0011] S5. Concentration: The filtrate A and the supernatant D are concentrated respectively to a solid content of 15-20% Brix to obtain concentrated solutions E and F.

[0012] S6. Preparation: Add β-cyclodextrin and maltodextrin to the concentrated solutions E and F respectively, and fully dissolve them to obtain prepared solutions G and H;

[0013] S7, sterilization: put the prepared liquids G and H into the sterilizer respectively, sterilize at 115-130℃ for 15s, and then cool to 45-60℃;

[0014] S8. Drying: Dry the sterilized mixed solutions G and H to obtain two cold-soluble instant rattan tea powder products I and J, respectively.

[0015] Preferably, in step S1, the raw material of rattan tea is old and tender leaves, crushed powder or tender stems of rattan tea that have undergone primary processing; the degree of drying is that the moisture content is less than 8%; the degree of crushing is less than 40 mesh and the content of crushed powder accounts for less than 20%.

[0016] Preferably, in step S2, the solvent is pure water with a resistivity of less than 10 MΩ*cm, the solid-liquid ratio during the first extraction is 1:8-1:10, the extraction temperature is 20-25°C, and the extraction time is 30-60 min; the solid-liquid ratios during the second and third extractions are 1:12-1:13 and 1:5-1:6 respectively, the extraction temperature is 85°C, and the extraction time is 30 min.

[0017] Preferably, step S3 is filtered using a tubular centrifuge, the temperature of the extract A is maintained at 20-25°C during the filtration process, and the centrifugal flow rate of the tubular centrifuge is 300 L / hr; the temperature of the extracts B and C is maintained at 45-60°C during the filtration process, and the centrifugal flow rate of the tubular centrifuge is 300 L / hr.

[0018] Preferably, in step S4, after the filtrate B and C are mixed, the filtrate is rapidly cooled to 10-15° C. in a cooling barrel through a coil cooling method, and then the cooling is continued for 6 hours; and then a horizontal centrifuge is used to separate the precipitate and the supernatant.

[0019] Preferably, in step S5, the concentrating equipment uses a triple-effect vacuum concentrating equipment, controls the vacuum degree to -65 to -95 MPa, the temperature to 45 to 75° C., and concentrates to a concentration of 15 to 18% Brix.

[0020] Preferably, in step S6, 1-5% of β-cyclodextrin and 1-30% of maltodextrin are added to the concentrated solutions E and F respectively and fully dissolved.

[0021] Preferably, in step S7, a tube-in-tube or coil UHT instantaneous high temperature sterilization device is used, the sterilization temperature is controlled at 115-127°C, the sterilization time is 10-15s, and then cooled to 45-60°C.

[0022] Preferably, in step S8, a pressure spray drying tower is used for drying, and the homogenization pressure is controlled to be 20 MPa, the temperature inside the tower is 90° C., and the exhaust temperature is 85° C.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the present invention, the raw material selection is wider, and the old and tender leaves, crushed powder or tender stems of rattan tea that have been processed after primary processing can be used as production raw materials, while the traditional rattan tea powder raw materials are limited to tender stems and leaves as raw materials. Therefore, it has a wider source of raw materials, which increases the output while reducing the cost; compared with the traditional process, its process flow is more convenient and faster, the product form and flavor characteristics are more diverse, the raw material utilization rate is higher, and the production energy consumption is lower;

[0025] 2. The present invention can firstly effectively reduce the excessive leaching of hot-soluble substances by low-temperature extraction, which can significantly ensure the cold-soluble characteristics of product I, and then separate by low-temperature sedimentation, which can fully ensure the cold-soluble characteristics of product J, so that both products can be quickly cold-soluble at room temperature, greatly improving the convenience of brewing;

[0026] 3. In the present invention, by first low-temperature extraction and then high-temperature extraction, the components contained in rattan tea can be significantly dissolved;

[0027] 4. The present invention can effectively embed substances that are easy to precipitate by adding a certain proportion of β-cyclodextrin and maltodextrin, so that the solubility of the instant rattan tea powder is greatly improved;

[0028] 5. The two instant rattan tea powders obtained by the present invention both have excellent cold dissolution effects. Among them, product I has a rich taste and taste, rich content of various effective ingredients, can be better compatible with other products, and has better product application characteristics; the taste and taste of product J is close to the brewing effect of the original leaf rattan tea, and the taste and taste restoration is better. The content of dihydromyricetin in both products is greater than 25%, and they have effective health care functions. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with embodiments.

[0030] Embodiment 1:

[0031] The steps for preparing cold-soluble instant rattan tea powder in this embodiment are as follows:

[0032] (1) Raw material processing: Dry and crush the raw materials of rattan tea; the raw materials of rattan tea are old and tender leaves, crushed powder or tender stems of rattan tea that have undergone primary processing; the degree of drying is that the moisture content is less than 8%; the degree of crushing is that the content of crushed powder less than 40 mesh is less than 20%.

[0033] (2) Double-effect extraction: Using pure water with a resistivity of less than 10MΩ*cm as a solvent, the rattan tea raw material was extracted in the solvent at a mass ratio of 1:8 at a temperature of 20°C for 60 minutes to obtain extract A; then, the raw material was extracted at a mass ratio of 1:11 and 1:5 at a temperature of 85°C for 30 minutes to obtain extracts B and C respectively;

[0034] (3) Filtration: Use a tubular centrifuge to filter the extracts A, B, and C respectively. During the filtration process, the temperature of the extract A is maintained at 20° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr; during the filtration process, the temperature of the extracts B and C is maintained at 45° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr, to obtain filtrates A, B, and C;

[0035] (4) Sedimentation separation: Mix the filtrate B and C, and cool them rapidly to 10°C in a cooling barrel through a coil cooling system. Then continue cooling for 6 hours to separate the precipitate and supernatant D.

[0036] (5) Concentration: The filtrate A and the supernatant D were concentrated using a triple-effect vacuum concentrator, respectively, with the vacuum degree controlled at -65 MPa and the temperature at 45°C, until the solid content reached 15% Brix, to obtain concentrated solutions E and F.

[0037] (6) Preparation: Add 1% β-cyclodextrin and 1% maltodextrin to the concentrated solutions E and F respectively and fully dissolve them to obtain prepared solutions G and H;

[0038] (7) Sterilization: Place the prepared solutions G and H in a tube-in-tube or coil UHT instantaneous high temperature sterilizer respectively, sterilize at 115°C for 15 seconds, and then cool to 45°C;

[0039] (8) Drying: The sterilized formulations G and H were dried in a pressure spray drying tower with the homogenization pressure controlled at 20 MPa, the temperature in the tower at 90°C, and the exhaust temperature at 85°C to obtain two cold-soluble instant rattan tea powder products I and J, respectively.

[0040] Embodiment 2:

[0041] The steps for preparing cold-soluble instant rattan tea powder in this embodiment are as follows:

[0042] (1) Raw material processing: Dry and crush the raw materials of rattan tea; the raw materials of rattan tea are old and tender leaves, crushed powder or tender stems of rattan tea that have undergone primary processing; the degree of drying is that the moisture content is less than 8%; the degree of crushing is that the content of crushed powder less than 40 mesh is less than 20%.

[0043] (2) Double-effect extraction: Using pure water with a resistivity of less than 10MΩ*cm as a solvent, the rattan tea raw material was extracted in the solvent at a mass ratio of 1:10 at a temperature of 20-25°C for 45 minutes to obtain extract A; then, the raw material was extracted at a mass ratio of 1:12 and 1:6 at a temperature of 85°C for 30 minutes to obtain extracts B and C respectively;

[0044] (3) Filtration: Use a tubular centrifuge to filter the extracts A, B, and C respectively. During the filtration process, the temperature of the extract A is maintained at 23° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr; during the filtration process, the temperature of the extracts B and C is maintained at 50° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr, to obtain filtrates A, B, and C;

[0045] (4) Sedimentation separation: Mix the filtrate B and C, and cool them rapidly to 12°C in a cooling barrel through a coil cooling system. Then continue cooling for 6 hours to separate the precipitate and supernatant D.

[0046] (5) Concentration: The filtrate A and the supernatant D were concentrated using a triple-effect vacuum concentrator, respectively, with the vacuum degree controlled at -80 MPa and the temperature at 60°C, until the solid content reached 18% Brix, to obtain concentrated solutions E and F.

[0047] (6) Preparation: Add 3% β-cyclodextrin and 15% maltodextrin to the concentrated solutions E and F respectively and fully dissolve them to obtain prepared solutions G and H;

[0048] (7) Sterilization: Place the prepared solutions G and H in a tube-in-tube or coil UHT instantaneous high temperature sterilizer, sterilize at 127°C for 15 seconds, and then cool to 52°C;

[0049] (8) Drying: The sterilized formulations G and H were dried in a pressure spray drying tower with the homogenization pressure controlled at 20 MPa, the temperature in the tower at 90°C, and the exhaust temperature at 85°C to obtain two cold-soluble instant rattan tea powder products I and J, respectively.

[0050] Embodiment 3:

[0051] The steps for preparing cold-soluble instant rattan tea powder in this embodiment are as follows:

[0052] (1) Raw material processing: Dry and crush the raw materials of rattan tea; the raw materials of rattan tea are old and tender leaves, crushed powder or tender stems of rattan tea that have undergone primary processing; the degree of drying is that the moisture content is less than 8%; the degree of crushing is that the content of crushed powder less than 40 mesh is less than 20%.

[0053] (2) Double-effect extraction: Using pure water with a resistivity of less than 10MΩ*cm as a solvent, the rattan tea raw material was extracted in the solvent at a mass ratio of 1:13 at a temperature of 25°C for 30 minutes to obtain extract A; then, the raw material was extracted at a mass ratio of 1:13 and 1:7 at a temperature of 85°C for 30 minutes to obtain extracts B and C respectively;

[0054] (3) Filtration: Use a tubular centrifuge to filter the extracts A, B, and C respectively. During the filtration process, the temperature of the extract A is maintained at 25° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr; during the filtration process, the temperature of the extracts B and C is maintained at 60° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr, to obtain filtrates A, B, and C;

[0055] (4) Sedimentation separation: Mix the filtrate B and C, and cool them rapidly to 15°C in a cooling barrel through a coil cooling system. Then continue cooling for 6 hours to separate the precipitate and supernatant D.

[0056] (5) Concentration: The filtrate A and the supernatant D were concentrated using a triple-effect vacuum concentrator, respectively, with the vacuum degree controlled at -95 MPa and the temperature at 75°C, until the solid content reached 20% Brix, to obtain concentrated solutions E and F.

[0057] (6) Preparation: Add 5% β-cyclodextrin and 30% maltodextrin to the concentrated solutions E and F respectively and fully dissolve them to obtain prepared solutions G and H;

[0058] (7) Sterilization: Place the prepared solutions G and H in a tube-in-tube or coil UHT instantaneous high temperature sterilizer, sterilize at 130°C for 15s, and then cool to 60°C;

[0059] (8) Drying: The sterilized formulations G and H were dried in a pressure spray drying tower with the homogenization pressure controlled at 20 MPa, the temperature in the tower at 90°C, and the exhaust temperature at 85°C to obtain two cold-soluble instant rattan tea powder products I and J, respectively.

[0060] Comparative Example:

[0061] The Chinese herbal medicine rattan tea powder purchased from Haiyisi Biological Products Co., Ltd. was used as a comparative example.

[0062] The above examples 1-3 were compared with the comparative examples, and the results are shown in Table 1:

[0063]

[0064] Table 1

[0065] As shown in Table 1, products I and J of the present invention can be quickly dissolved in hot water, and can also be cold dissolved in a short time at room temperature, and the cold dissolution speed is even faster than the dissolution speed of traditional rattan tea powder in hot water. In addition, the product of the present invention also has a higher proportion in dihydromyricetin content, which fully illustrates the advantages of the present invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing cold-soluble instant rattan tea powder by double-effect extraction, characterized in that: The steps include: S1. Raw material processing: drying and crushing the rattan tea raw materials; S2, double-effect extraction: extract the rattan tea raw material in a solvent at a mass ratio of 1:8-1:13 at a temperature of 20-25°C for 30-60 minutes to obtain extract A; then extract it at a solvent mass ratio of 1:11-1:13 and 1:5-1:7 at a temperature of 85°C for 30 minutes each to obtain extracts B and C; S3, filtration: using a centrifuge to filter the extracts A, B, and C respectively to obtain filtrates A, B, and C; S4, sedimentation separation: Mix the filtrate B and C, place in a cooling barrel at less than 15°C, cool for 6 hours, and separate the supernatant D; S5. Concentration: The filtrate A and the supernatant D are concentrated respectively to a solid content of 15-20% Brix to obtain concentrated solutions E and F. S6. Preparation: Add β-cyclodextrin and maltodextrin to the concentrated solutions E and F respectively, and fully dissolve them to obtain prepared solutions G and H; S7, sterilization: put the prepared liquids G and H into the sterilizer respectively, sterilize at 115-130℃ for 15s, and then cool to 45-60℃; S8. Drying: Dry the sterilized mixed solutions G and H to obtain two cold-soluble instant rattan tea powder products I and J, respectively.

2. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S1, the raw material of rattan tea is old and tender leaves, crushed powder or tender stems of rattan tea that have undergone primary processing; the degree of drying is that the moisture content is less than 8%; the degree of crushing is less than 40 mesh and the content of crushed powder accounts for less than 20%.

3. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S2, the solvent is pure water with a resistivity of less than 10 MΩ*cm, the solid-liquid ratio in the first extraction process is 1:8-1:10, the extraction temperature is 20-25°C, and the extraction time is 30-60 min; the solid-liquid ratios in the second and third extraction processes are 1:12-1:13 and 1:5-1:6 respectively, the extraction temperature is 85°C, and the extraction time is 30 min.

4. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S3, a tubular centrifuge is used for filtration. During the filtration process, the temperature of the extract A is maintained at 20-25° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr. During the filtration process, the temperature of the extracts B and C is maintained at 45-60° C., and the centrifugal flow rate of the tubular centrifuge is 300 L / hr.

5. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S4, the filtrate B and C are mixed and then cooled rapidly to 10-15° C. in a cooling barrel by means of a coil, and then cooled continuously for 6 hours; and then a horizontal centrifuge is used to separate the precipitate and the supernatant.

6. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S5, the concentrator uses a triple-effect vacuum concentrator, controls the vacuum degree to -65 to -95 MPa, and the temperature to 45 to 75° C., and concentrates to a concentration of 15 to 18% Brix.

7. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In the step S6, 1-5% of β-cyclodextrin and 1-30% of maltodextrin are added to the concentrated solutions E and F respectively and fully dissolved.

8. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In the step S7, a tube-in-tube or coil UHT instantaneous high temperature sterilization device is used, the sterilization temperature is controlled at 115-127° C., the sterilization time is 10-15 seconds, and then the sterilization temperature is cooled to 45-60° C.

9. The method for preparing cold-soluble instant rattan tea powder by double-effect extraction as claimed in claim 1, characterized in that: In step S8, a pressure spray drying tower is used for drying, and the homogenization pressure is controlled to be 20 MPa, the temperature inside the tower is 90° C., and the exhaust air temperature is 85° C.

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