Prepared rehmannia root stock solution and extraction method thereof

Abstract

The invention belongs to the technical field of food production, and particularly relates to a prepared rehmannia root stock solution and an extraction method thereof, the extraction method comprises the following steps: step 1, dicing: dicing prepared rehmannia roots; step 2, soaking: soaking the sliced prepared rehmannia root in purified water; step 3, filtering: standing the soaking solution in the step 2, and then filtering; 4, concentration: evaporating and concentrating the filtrate in the step 3 to prepare a stock solution with the concentration of 15%; and step five, filling the stock solution in the step four, and then performing pasteurization. In the soaking process of the prepared rehmannia root stock solution, the temperature is high, and synchronous sterilization can be performed by adopting purified water, so that bacterium breeding is avoided, the extraction quality of the prepared rehmannia root stock solution is improved, the cost is reduced, the labor is reduced, the production efficiency is improved, large-batch production is facilitated, and the prepared rehmannia root stock solution is free of additives and long in storage life.

Description

Technical Field

[0001] The invention belongs to the technical field of food production, and in particular relates to a prepared rehmannia root solution and an extraction method thereof. Background Art

[0002] Prepared Rehmannia root is made from raw Rehmannia root and comes in irregular pieces and fragments of varying sizes and thicknesses. Its surface is jet-black, shiny, and highly viscous. It is soft and resilient, not easily broken, and its cross-section is jet-black, shiny, with a slight odor and a sweet taste. Prepared Rehmannia root contains a variety of nutrients, such as rehmannia glycosides and catalpol, which can regulate the body's immune function, enhance the phagocytic capacity of macrophages, improve the body's resistance, and prevent the occurrence of diseases. It also has antioxidant effects, can scavenge free radicals in the body, reduce oxidative stress damage to cells, slow the process of cell aging, and maintain a healthy state of the body. Therefore, prepared Rehmannia root products are widely popular. In the prior art, the production process of prepared Rehmannia root products for health care (such as prepared Rehmannia root liquid) is complex. To extend the shelf life, a large amount of additives must be added, which does not meet people's demand for green and healthy food. Furthermore, the production process of prepared Rehmannia root liquid in the prior art is inefficient, costly, and time-consuming. Therefore, it is very necessary to design a method for extracting and separating prepared Rehmannia root liquid. Summary of the Invention

[0003] The purpose of the present invention is to design a Rehmannia glutinosa liquid and its extraction method, which can improve production efficiency and extend shelf life without adding any food additives. To achieve the above purpose, the present invention adopts the following technical solutions:

[0004] A method for extracting Rehmannia glutinosa liquid comprises the following steps in sequence:

[0005] Step 1: Cut into pieces: cut the Rehmannia root into pieces;

[0006] Step 2: Soaking: Soak the cut Rehmannia root into pure water;

[0007] Step 3: Filtering: The soaking liquid in step 2 is allowed to stand and then filtered; the soaking liquid is first filtered through a double filter, the filter screen of the double filter is a 200-mesh 304 stainless steel filter screen, and the filtrate is allowed to stand to obtain a supernatant, which is then centrifuged through a disc separator for centrifugal filtration;

[0008] Step 4: Concentration: Evaporate and concentrate the filtrate in step 3 to prepare a stock solution with a concentration of 15%;

[0009] Step 5: The original liquid in step 4 is filled and then pasteurized at a temperature of 75 degrees Celsius for 30 minutes.

[0010] Preferably, the soaking temperature in step 2 is 120-130°C.

[0011] Preferably, the soaking time of Rehmannia glutinosa in step 2 is 2-4 hours.

[0012] Preferably, in step three, the soaking liquid is left standing for no less than 20 minutes.

[0013] Preferably, the prepared Rehmannia root in step one is prepared by steaming raw Rehmannia root, and the steaming process is completed in a steamer at one time. During the steaming process, the box is not opened to avoid contamination. The steaming process is as follows: first, the cleaned raw rehmannia is put into the rotating drum in the steamer, and a spray pipe is provided in the steamer above the rotating drum, and the spray pipe is connected to the rice wine storage device. A certain amount of rice wine is stored in the rice wine storage device according to the amount of raw rehmannia. A reflux pipe is provided at the bottom of the steamer, and the reflux pipe is connected to the spray pipe, and a liquid pump is provided on the reflux pipe; the rotating drum is covered with through holes, pure water is added to the steamer, and vacuum steaming is performed for 2-3 hours; then rice wine is sprayed onto the rotating drum through the spray pipe, and the rotating drum rotates continuously during the spraying process to ensure that the rice wine and the rehmannia in the rotating drum are fully and evenly contacted. When spraying rice wine, the steamer maintains normal pressure for 5 minutes to allow the rice wine to be fully absorbed by the rehmannia, and then the steamer continues to switch to a vacuum state to continue steaming. After that, the rotating drum rotates one circle every 0.5 hours, and the rotating drum takes 1 minute to rotate one circle. The slow rotation speed can make the rehmannia in the rotating drum flip while reducing damage to Rehmannia root; during the rotation of the drum, the spray pipe sprays rice wine onto the drum and the steamer is switched to normal pressure for 5 minutes, and vacuum steaming-normal pressure spraying-vacuum steaming-normal pressure spraying... is circulated for about 4 hours until the rice wine in the rice wine storage device is sprayed, and the preparation of Rehmannia root is completed. In the above process, after the rice wine is sprayed, the reflux pipe sprays the liquid at the bottom of the steamer into the drum, further improving the steaming effect; during the above steaming process, Rehmannia root will not be taken out, avoiding external pollution, improving the steaming effect and efficiency, and the continuous switching between vacuum and normal pressure during the steaming process improves the adequacy of Rehmannia root's absorption of rice wine, further improving the quality of Rehmannia root; the cooperation of the spray pipe and the reflux pipe can make the rice wine in the liquid at the bottom of the steamer be absorbed by Rehmannia root in the drum again, reducing the waste of rice wine and improving the steaming effect.

[0014] Preferably, the filtrate in step 4 is concentrated using a single-effect concentrator.

[0015] The present invention also comprises a prepared rehmannia root stock solution, which is prepared by adopting the above-mentioned method for extracting the prepared rehmannia root stock solution.

[0016] The working principle of the present invention is that by soaking Rehmannia root in pure water, bacterial growth during the soaking process is reduced. In addition, during the soaking process of Rehmannia root and pure water, the temperature is 120-130° C., which can simultaneously sterilize the Rehmannia root. The soaking liquid is filtered and concentrated before filling, and then pasteurized after filling. The overall process is simple, efficient, free of any additives, green and healthy, and has a long shelf life. The Rehmannia root is steamed in a one-time staged manner, and the steaming process is pollution-free, thereby improving production efficiency and the quality of the Rehmannia root, and having low cost and good quality.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the process of making Rehmannia glutinosa is closed and pollution-free, which improves the quality of Rehmannia glutinosa and shortens the time; the temperature is high during the soaking process of Rehmannia glutinosa stock solution and pure water is used for simultaneous sterilization, which avoids bacterial growth, improves the quality of Rehmannia glutinosa stock solution extraction, reduces costs, reduces labor, improves production efficiency, and is conducive to large-scale production; the Rehmannia glutinosa stock solution has no additives and has a long shelf life. DETAILED DESCRIPTION

[0018] The technology of the present invention is further described in detail below in conjunction with specific implementation methods.

[0019] Example 1

[0020] This embodiment provides a method for extracting Rehmannia glutinosa liquid, which comprises the following steps in sequence:

[0021] Step 1: Cut into pieces: cut the Rehmannia root into pieces;

[0022] Step 2: Soaking: Soak the cut Rehmannia root in pure water for 2 hours at a temperature of 120°C.

[0023] Step 3: Filtration: The soaking liquid in step 2 is allowed to stand for 20 minutes and then filtered. The soaking liquid is first filtered through a double filter. The filter screen of the double filter is a 200-mesh 304 stainless steel filter screen. The filtrate is allowed to stand to obtain a supernatant, and then the supernatant is centrifuged through a disc separator for centrifugal filtration.

[0024] Step 4: Concentration: Evaporate and concentrate the filtrate in step 3 to prepare a stock solution with a concentration of 15%;

[0025] Step 5: The original liquid in step 4 is filled and then pasteurized at a temperature of 75 degrees Celsius for 30 minutes.

[0026] The prepared Rehmannia root in step one is steamed with raw Rehmannia root, and the steaming process is completed in a steamer at one time. The steaming process is as follows: first, the cleaned raw Rehmannia root is put into the rotating drum in the steamer, and a spray pipe is provided in the steamer above the rotating drum, and the spray pipe is connected to a rice wine storage device, in which a certain amount of rice wine is stored according to the amount of raw Rehmannia root. A reflux pipe is provided at the bottom of the steamer, and the reflux pipe is connected to the spray pipe, and a liquid pump is provided on the reflux pipe; the rotating drum is covered with through holes, and pure water is added to the steamer, and vacuum steaming is performed for 2-3 hours; then rice wine is sprayed onto the rotating drum through the spray pipe, and the rotating drum rotates continuously during the spraying process, so that the rice wine and the Rehmannia root in the rotating drum are fully and evenly contacted, and when spraying the rice wine, the steamer maintains normal pressure for 5 minutes, so that the rice wine can be fully absorbed by the Rehmannia root, and then the steamer continues to switch to a vacuum state to continue steaming, and thereafter the rotating drum rotates once every 0.5 hours, and the rotating drum takes 1 minute to rotate once a circle. The slow rotation speed can reduce the pressure while turning the Rehmannia root in the rotating drum. damage to Rehmannia root; during the rotation of the drum, the spray pipe sprays rice wine onto the drum and the steamer is switched to normal pressure for 5 minutes, and vacuum steaming-normal pressure spraying-vacuum steaming-normal pressure spraying... is circulated for about 4 hours until the rice wine in the rice wine storage device is sprayed, and the preparation of Rehmannia root is completed. In the above process, after the rice wine is sprayed, the reflux pipe sprays the liquid at the bottom of the steamer into the drum, further improving the steaming effect; during the above steaming process, Rehmannia root will not be taken out, avoiding external pollution, improving the steaming effect and efficiency, and the continuous switching between vacuum and normal pressure during the steaming process improves the adequacy of Rehmannia root's absorption of rice wine, further improving the quality of Rehmannia root; the cooperation of the spray pipe and the reflux pipe can make the rice wine in the liquid at the bottom of the steamer be absorbed by Rehmannia root in the drum again, reducing the waste of raw materials and improving the steaming effect.

[0027] Preferably, the filtrate in step 4 is concentrated using a single-effect concentrator.

[0028] This embodiment also includes a Rehmannia glutinosa stock solution, which is prepared using the above-mentioned Rehmannia glutinosa stock solution extraction method.

[0029] Example 2

[0030] The only difference from Example 1 is that the soaking temperature in step 2 is 125° C. and the soaking time is 3 hours. In step 3, the soaking liquid is left to stand for no less than 25 minutes.

[0031] Example 3

[0032] The only difference from Example 1 is that the soaking temperature in step 2 is 130° C. and the soaking time is 4 hours. In step 3, the soaking liquid is left to stand for no less than 30 minutes.

[0033] In the above embodiments 1-3, during the extraction process of Rehmannia glutinosa stock solution, the number of vacuum steaming and normal pressure spraying is reasonably adjusted according to the amount of raw Rehmannia glutinosa, thereby improving the production efficiency and quality of Rehmannia glutinosa, further improving the quality of Rehmannia glutinosa stock solution, reducing production costs, and improving production efficiency. The extracted Rehmannia glutinosa stock solution does not contain any food additives, has a long shelf life, can be stored at room temperature for more than 3 months, and can also be stored at a high temperature of 38°C for 1-2 months.

[0034] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A method for extracting Rehmannia glutinosa liquid, characterized in that: The following steps are involved: Step 1: Cut the Rehmannia root into pieces; Step 2: Soaking: Soak the cut Rehmannia root into pure water; Step 3: Filtering: Let the soaking liquid in step 2 stand and then filter; Step 4: Concentration: Evaporate and concentrate the filtrate in step 3 to prepare a stock solution with a concentration of 15%; Step 5: Fill the original liquid in step 4 and then pasteurize it.

2. The method for extracting the Rehmannia glutinosa stock solution according to claim 1, wherein: The soaking temperature of Rehmannia glutinosa in step 2 is 120-130°C.

3. The method for extracting Rehmannia glutinosa stock solution according to claim 1 or 2, wherein: The soaking time of Rehmannia glutinosa in step 2 is 2-4 hours.

4. The method for extracting the Rehmannia glutinosa stock solution according to claim 1, wherein: In step 3, the soaking liquid is left to stand for no less than 20 minutes.

5. The method for extracting Rehmannia glutinosa stock solution according to claim 1, wherein: The cooked rehmannia root in step one is prepared by steaming raw rehmannia root, and the steaming process is completed in a steamer.

6. The method for extracting Rehmannia glutinosa stock solution according to claim 1, wherein: The filtrate in step 4 is concentrated using a single-effect concentrator.

7. A Rehmannia glutinosa liquid, characterized by: The product is prepared by the extraction method of Rehmannia glutinosa liquid according to any one of claims 1 to 6.