Unprocessed rehmannia root stock solution and extraction method thereof

Abstract

The invention belongs to the technical field of food production, and particularly relates to a raw rehmannia root stock solution extraction method which sequentially comprises the following steps: step 1, cleaning: cleaning raw rehmannia roots with purified water; step 2, drying: drying the cleaned radix rehmanniae recen to remove surface moisture; step 3, dicing: dicing the dried radix rehmanniae recen; step 4, soaking, namely soaking the sliced radix rehmanniae in purified water; step 5, filtering: standing the soaking solution in the step 4, and then filtering; step 6, concentration: evaporating and concentrating the filtrate in the step 5 to prepare a stock solution with the concentration of 5%; and step 7, filling the stock solution in the step 6, and then performing pasteurization. According to the method, decay of the radix rehmanniae recen can be effectively delayed, the defects that the radix rehmanniae recen is long in preservation time and not easy to process are overcome, sufficient time is provided for the subsequent processing procedure of the radix rehmanniae recen, low-temperature sterilization can be conducted in the production process, the extraction quality of the radix rehmanniae recen stock solution is improved, and production is facilitated.

Description

Technical Field

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

[0002] Raw Rehmannia root is a common Chinese medicinal material, which is the fresh or dried root of Rehmannia root, a plant of the Scrophulariaceae family. It plays an important role in traditional Chinese medicine theory and clinical application. Raw Rehmannia root mainly contains ingredients such as catalpol, dihydrocatalpol, rehmannia root, polysaccharides, amino acids, etc. Raw Rehmannia root has the effects of enhancing immune function, lowering blood sugar, lowering blood lipids, anti-oxidation, anti-inflammatory, and protecting the liver. Its extract (raw Rehmannia root liquid) also has certain potential in regulating endocrine function and improving renal function, so it is unanimously welcomed by the public. Because raw Rehmannia root is very easy to rot and deteriorate after being broken and wet, and has a short shelf life, in the extraction process of raw Rehmannia root liquid, in order to ensure the quality of the product, a large amount of rotten raw Rehmannia root will be discarded, which not only greatly increases the production cost, but also requires the rotten raw Rehmannia root to be selected out in each process, which increases the workload and reduces the production efficiency, causing trouble for the production of raw Rehmannia root liquid. Therefore, it is very necessary to design a method for extracting and separating raw Rehmannia root liquid. Summary of the Invention

[0003] The purpose of the present invention is to design a raw Rehmannia root 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 raw Rehmannia root liquid comprises the following steps in sequence:

[0005] Step 1: Wash the raw Rehmannia root with purified water;

[0006] Step 2: drying: drying the washed raw Rehmannia root to remove surface moisture;

[0007] Step 3: Cut the dried Rehmannia root into pieces;

[0008] Step 4: Soaking: Soak the cut Rehmannia root in purified water;

[0009] Step 5: Filtration: The soaking liquid from step 4 is allowed to stand and then filtered. The soaking liquid is first filtered through a double filter, and the filtrate is allowed to stand to obtain a supernatant, which is then centrifuged through a disc separator. The filter screen of the double filter is a 200-mesh 304 stainless steel filter screen.

[0010] Step 6: Concentration: Evaporate and concentrate the filtrate in step 5 to prepare a stock solution with a concentration of 5%;

[0011] Step seven, filling the original liquid in step six and then pasteurizing it.

[0012] Preferably, the raw rehmannia root in step 1 is sequentially cleaned by a bubbling cleaning machine, a drum cleaning machine, and a brush cleaning machine, and then passed through a vibrating screen to remove excess water and impurities on the surface of the raw rehmannia root.

[0013] Preferably, the soaking time of the raw Rehmannia root in step 4 is 3-4 hours.

[0014] Preferably, the soaking temperature of the raw Rehmannia root in step 4 is 50-75°C.

[0015] Preferably, in step five, the soaking liquid is left standing for no less than 20 minutes.

[0016] Preferably, in step six, the filtrate is concentrated using a single-effect concentrator.

[0017] The present invention also comprises a raw Rehmannia root liquid, which is prepared by adopting the above-mentioned raw Rehmannia root liquid extraction method.

[0018] The working principle of the present invention is that by using pure water to wash the raw rehmannia, the contamination of the raw rehmannia with broken skin by bacteria in the water during the washing process is avoided, the decay time of the raw rehmannia is delayed, and time is gained for other processes to be carried out normally. In addition, during the soaking process of the raw rehmannia and the pure water, the temperature is 50-75°C, which can simultaneously play a role of low-temperature sterilization on the raw rehmannia. The soaking liquid is filtered and concentrated and then filled, and pasteurized after filling. The overall process is simple, efficient, does not contain any additives, is green and healthy, and has a long shelf life.

[0019] Compared with the prior art, the present invention has the following beneficial effects: it can effectively delay the decay of Rehmannia root, overcome the shortcomings of Rehmannia root such as short storage time and difficulty in processing, provide sufficient time for subsequent processing steps of Rehmannia root, and can perform low-temperature sterilization during the production process, thereby improving the quality of Rehmannia root stock solution extraction, reducing the waste of Rehmannia root, lowering costs, reducing labor, improving production efficiency, and facilitating mass production. DETAILED DESCRIPTION

[0020] The technology of the present invention is further described in detail below in conjunction with specific implementation methods.

[0021] Example 1

[0022] This embodiment proposes

[0023] A method for extracting raw Rehmannia root liquid comprises the following steps in sequence:

[0024] Step 1: Cleaning: Clean the raw rehmannia root with purified water. During cleaning, the raw rehmannia root is sequentially placed in a bubbling cleaning machine, a drum cleaning machine, and a brush cleaning machine for cleaning, and then passed through a vibrating screen to remove excess water and impurities on the surface of the raw rehmannia root.

[0025] Step 2: drying: drying the washed raw Rehmannia root to remove surface moisture;

[0026] Step 3: Cut the dried Rehmannia root into pieces;

[0027] Step 4: soaking. Soak the cut Rehmannia root in pure water (in a heatable soaking pot) for 3 hours at a soaking temperature of 50°C.

[0028] Step 5: Filtration: The soaking liquid in step 4 is allowed to stand and then filtered. The soaking liquid is first filtered through a double filter. The filtrate is allowed to stand for 20 minutes to obtain a supernatant, which is then centrifuged through a disc separator. The filter screen of the double filter is a 200-mesh 304 stainless steel filter screen.

[0029] Step 6: Concentration: The filtrate in step 5 is evaporated and concentrated using a single-effect concentrator to prepare a stock solution with a concentration of 5%;

[0030] Step seven, filling the original liquid in step six and then pasteurizing it.

[0031] This embodiment also includes a raw Rehmannia root solution, which is prepared using the above-mentioned raw Rehmannia root solution extraction method.

[0032] Example 2

[0033] The only difference from Example 1 is that the soaking time in step 4 is 3.5 hours and the soaking temperature is 65°C.

[0034] Example 3

[0035] The only difference from Example 1 is that the soaking time in step 4 is 4 hours and the soaking temperature is 75°C.

[0036] In Examples 1-3, the extraction process of the raw Rehmannia root solution reduced the loss of raw Rehmannia root due to decay from the original 40% to 10%, thereby reducing production costs and improving production efficiency. Furthermore, the extracted raw Rehmannia root solution contains no food additives and has a long shelf life, being able to be stored for more than three months at room temperature and for one to two months at 38°C. The equipment used in Examples 1-3 is as follows: a bubbling washer (DQX-800), a drum washer (QX3000), a brush washer (HD series brush washer such as HD1200), and a vibrating screen (linear vibrating screen DK-1200).

[0037] 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 raw Rehmannia root liquid, characterized in that: The following steps are included in sequence: Step 1: Wash the raw Rehmannia root with purified water; Step 2: drying: drying the washed raw Rehmannia root to remove surface moisture; Step 3: Cut the dried Rehmannia root into pieces; Step 4: Soaking: Soak the cut Rehmannia root in purified water; Step 5: Filtering: Let the soaking liquid in step 4 stand and then filter; Step 6: Concentration: Evaporate and concentrate the filtrate in step 5 to prepare a stock solution with a concentration of 5%; Step seven, filling the original liquid in step six and then pasteurizing it.

2. The method for extracting the raw Rehmannia root solution according to claim 1, wherein: The raw rehmannia root in step 1 is cleaned in a bubbling cleaning machine, a drum cleaning machine, and a brush cleaning machine in sequence, and then passed through a vibrating screen to remove excess water and impurities on the surface of the raw rehmannia root.

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

4. The method for extracting the raw Rehmannia root solution according to claim 1, wherein: The soaking temperature of the raw Rehmannia root in step 4 is 50-75°C.

5. The method for extracting the raw Rehmannia root solution according to claim 1, wherein: In step 5, the soaking liquid is left to stand for no less than 20 minutes.

6. The method for extracting the raw Rehmannia root solution according to claim 1, wherein: In step six, the filtrate is concentrated using a single-effect concentrator.

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