A method for fresh traditional Chinese medicine preservation by electric field and magnetic field

Abstract

This invention discloses a method and apparatus for preserving fresh Chinese medicinal herbs using a combined electric and magnetic field, belonging to the field of post-harvest preservation technology. The method includes: placing cleaned and disinfected fresh Chinese medicinal herbs in a storage device, while simultaneously applying a low-frequency polarized electric field and a static magnetic field; wherein the output voltage of the low-frequency polarized electric field is 3000 V, the current is 1-5 mA, the frequency is 50-60 Hz, and the electric field strength is 25-35 kV / m; the strength of the static magnetic field is 350-450 Gs. This invention effectively regulates cell membrane permeability and free radical metabolism through the spatial synergistic effect of the low-frequency polarized electric field and the static magnetic field, significantly delaying post-harvest decay of Chinese medicinal herbs, inhibiting microbial growth, maintaining the stability of active ingredients, and achieving good preservation effects even at relatively high storage temperatures. It has advantages such as energy saving, being green, easy to operate, and highly applicable, and is suitable for the storage and preservation of various fresh Chinese medicinal herbs.

Description

Technical Field

[0001] This invention relates to the field of post-harvest preservation technology of Chinese medicinal materials, specifically to a method and apparatus for maintaining the quality of fresh Chinese medicinal materials by utilizing the synergistic effect of physical fields. Background Technology

[0002] Fresh Chinese medicinal herbs, because they have not undergone high-temperature processing, have reduced the loss and destruction of volatile components (such as volatile oils), heat-sensitive components (such as some glycosides and vitamins), and various biological enzymes compared to common dried medicinal herbs. This maximizes the preservation of the integrity and high activity of the natural active ingredients of the herbs, giving them significant advantages in medicinal value.

[0003] However, fresh Chinese medicinal herbs retain high water activity and vigorous physiological metabolism after harvesting. Their cell structure is easily affected by factors such as oxidation, microbial infection, and enzymatic browning, resulting in quality deterioration problems such as rotting, discoloration, wilting, dehydration, and a decrease in medicinal components. This significantly affects the quality of the herbs, the content of effective components, and their commercial value, becoming a key technical bottleneck restricting the industrialization of fresh Chinese medicinal herbs.

[0004] Traditional Chinese medicine storage methods often involve refrigeration, drying, or the use of chemical antibacterial agents. However, these methods still have significant limitations: for example, refrigeration alone cannot effectively inhibit some microorganisms, drying will damage the form and active ingredients of fresh medicinal materials, and chemical preservatives pose a risk of residue and do not meet the requirements of green and safe practices.

[0005] In recent years, physical preservation technologies have gradually become a research hotspot. For example, electric field preservation technology, by regulating cell membrane permeability and influencing ion migration and physiological metabolism, can inhibit the metabolism of medicinal materials and the growth of microorganisms without causing thermal damage. Magnetic field preservation technology, on the other hand, can further delay decay by altering the activity of biological enzymes and interfering with cell membrane potential and free radical metabolism through low-intensity magnetic fields. Both are non-thermal physical preservation technologies and have certain preservation effects in the field of fruit and vegetable preservation.

[0006] However, existing research mostly focuses on the application of a single electric field or a single magnetic field, with few reports on combining the two for the preservation of fresh Chinese medicinal herbs. Due to their complex composition, diverse tissue structure, and sensitive active ingredients, Chinese medicinal herbs have far higher requirements for preservation technology than ordinary fruits and vegetables. While treatment with a single electric or magnetic field can partially delay decay, it is difficult to simultaneously address the multiple needs of inhibiting microorganisms, maintaining enzyme activity homeostasis, and preventing the oxidation of various active ingredients.

[0007] Therefore, there is an urgent need for a combined electric and magnetic field preservation technology specifically for fresh Chinese medicinal materials, which can achieve efficient, green, and long-lasting preservation effects through complementary mechanisms and parameter optimization. Summary of the Invention

[0008] This invention aims to overcome the shortcomings of existing technologies and provide a method and apparatus for preserving fresh Chinese medicinal herbs using a low-frequency polarized electric field combined with a static magnetic field. This method, through the synergistic effect of electric and magnetic fields with specific spatial configuration and parameter matching, aims to significantly delay the post-harvest aging process of Chinese medicinal herbs, effectively inhibit microbial infection, and maximize the stability of their appearance, nutritional components, and active medicinal substances, thereby extending their shelf life.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a combined preservation method for fresh Chinese medicinal materials, comprising the following steps: Place the cleaned and disinfected fresh Chinese medicinal herbs in a storage container; In the storage device, a low-frequency polarized electric field and a static magnetic field are simultaneously applied to the fresh Chinese medicinal materials; The parameters for applying the low-frequency polarized electric field are: output voltage 3000 V, current 1-5 mA, frequency 50-60 Hz, electric field strength 25-35 kV / m; and the strength of the applied static magnetic field is 350-450 Gs.

[0010] Preferably, the direction of the low-frequency polarized electric field is perpendicular to the main plane on which the Chinese medicinal materials are placed.

[0011] Preferably, the direction of the static magnetic field is parallel to the main plane on which the Chinese medicinal materials are placed.

[0012] Preferably, the direction of the low-frequency polarized electric field is orthogonal to the direction of the static magnetic field.

[0013] Preferably, the output voltage of the low-frequency polarized electric field is 3000 V, the current is 5 mA, the frequency is 50 Hz, and the electric field strength is 30 kV / m; the strength of the static magnetic field is 400 Gs.

[0014] Preferably, the ambient temperature inside the storage device is 12-15℃ and the relative humidity is 75-80%.

[0015] Preferably, the ambient temperature inside the storage device is 15°C and the relative humidity is 75%.

[0016] Secondly, the present invention provides a combined preservation device for implementing the method, comprising a constant temperature and humidity refrigerator, an electric field component, and a magnetic field component.

[0017] The present invention has the following beneficial effects: (1) In this invention, the low-frequency polarized electric field and the static magnetic field work together to regulate cell homeostasis under specific parameter ratios and spatial conditions, which significantly delays the post-harvest decay process of fresh Chinese medicinal materials and maintains the stability of active ingredients and nutrients.

[0018] (2) The combination of low-frequency polarized electric field and static magnetic field has a significant synergistic effect. It can still achieve good preservation effect at relatively high storage temperature, reduce refrigeration load and reduce energy consumption.

[0019] (3) This method is applicable to a variety of Chinese medicinal materials, is simple and convenient to operate, and has good universality and application value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the low-frequency polarized electric field synergistic static magnetic field combined preservation device of the present invention; Figure 2 This is a graph showing the change in weight loss rate of fresh burdock stored for 12 days in Example 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13; Figure 3 This is a graph showing the changes in SOD enzyme activity of fresh burdock stored for 12 days in Example 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13. Figure 4 This is a graph showing the changes in POD enzyme activity in fresh burdock stored for 12 days in Example 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13. Figure 5 This is a graph showing the change in total flavonoid content in fresh burdock stored for 12 days in Example 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13; Figure 6 This is a graph showing the change in total phenolic content of fresh burdock stored for 12 days in Example 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13; Figure 7 The mold growth of fresh Atractylodes lancea stored for 12 days in Example 2 and Comparative Example 2; Figure 8 This is a graph showing the change in total phenolic content of fresh pungent roots stored for 12 days in Examples 3 and Comparative Examples 3, 6, 9, 14, 15, 16, and 17. Figure 9 This is a graph showing the change in total saponin content of fresh lisianthus roots stored for 12 days in Examples 3 and Comparative Examples 3, 6, 9, 14, 15, 16, and 17. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the embodiments. The test materials used in the embodiments can all be purchased through conventional means.

[0022] The core of this invention lies in the spatial coordination of a low-frequency polarized electric field and a static magnetic field. For example... Figure 1As shown, the vertical electric field polarizes the medicinal cell in the vertical direction, affecting the opening and closing of ion channels on the cell membrane, thus slowing down the outflow of nutrients and the accumulation of metabolic waste. The horizontal magnetic field penetrates the medicinal tissue, interfering with the orientation and movement of magnetically sensitive molecules within the cell (such as enzymes containing free radicals and water molecules), and inhibiting oxidation reactions. When the electric and magnetic fields are orthogonal, their forces on charged particles and magnetic molecules within the cell are perpendicular to each other, which can more comprehensively "cover" and interfere with various physiological and biochemical pathways that lead to quality deterioration, thereby achieving synergistic enhancement in inhibiting respiration, delaying enzymatic browning, maintaining membrane integrity, and preventing oxidative degradation of components.

[0023] Reference Figure 1 The combined preservation device in this embodiment consists of a constant temperature and humidity refrigerator, an electric field component, and a magnetic field component. The device has a built-in waterproof socket for power supply. The output of the low-frequency polarized electric field generator is directly connected to a single-polarized electric field plate. After being energized, it forms a polarized electric field distributed vertically, regulating the cell membrane permeability and ion homeostasis of the medicinal herbs, delaying aging, and improving preservation. The magnetic field generating component is installed on the inner wall of the cavity on both sides of the central shelf, consisting of two sets of sidewall coils that form a magnetic field distributed horizontally. This magnetic field works in conjunction with the electric field to achieve efficient preservation of fresh medicinal herbs. In practical applications, the low-frequency polarized electric field and the static magnetic field can be driven separately by independent power supplies and control systems. They can be started synchronously or adjusted sequentially according to preservation requirements. Those skilled in the art can choose according to their actual needs.

[0024] Example 1: Preservation of Fresh Burdock (1) Wear gloves, handle with care, select fresh burdock root stems that are free from mechanical damage, of good quality and uniform thickness, gently wipe the surface of the burdock with 75% ethanol, and clean and disinfect the tray and the inner cavity of the device where the burdock is placed. Place the burdock on a ceramic tray with EPE pearl cotton pads. (2) Place the fresh burdock in a preservation device equipped with a low-frequency polarized electric field and a static magnetic field. The output voltage of the low-frequency polarized electric field is 3000 V, the current is 5 mA, and the frequency is 50 Hz (vertical direction). The burdock is placed about 10 cm away from the electric field plate, and the field strength is about 30 kV / m. The magnetic field strength is set to 400 Gs (horizontal direction).

[0025] (3) The temperature conditions in the regulating device are 15℃ and the relative humidity is 75%. Samples are taken every three days during storage to determine the quality indicators of fresh Chinese medicinal materials.

[0026] Example 2: Preservation of Fresh Atractylodes lancea (1) Wear gloves, handle with care, select fresh Atractylodes rhizomes without mechanical damage and of good quality, wipe the surface of Atractylodes rhizomes gently with 75% ethanol, and clean and disinfect the tray and the inner cavity of the device on which Atractylodes rhizomes are placed. Place Atractylodes rhizomes on a ceramic tray with EPE pearl cotton pads. (2) Place the fresh Atractylodes lancea in a preservation device equipped with a low-frequency polarized electric field and a static magnetic field. The output voltage of the low-frequency polarized electric field is 3000 V, the current is 5 mA, and the frequency is 50 Hz (vertical direction). The Atractylodes lancea is placed about 10 cm away from the electric field plate, and the field strength is about 30 kV / m. The magnetic field strength is set to 400 Gs (horizontal direction).

[0027] (3) The temperature conditions in the regulating device are 15℃ and the relative humidity is 75%. Samples are taken every three days during storage to determine the quality indicators of fresh Chinese medicinal materials.

[0028] Example 3: Preservation of Fresh Platycodon grandiflorus (1) Wear gloves, handle with care, select fresh bellflower roots that are free from mechanical damage, of good quality and uniform thickness, gently wipe the surface of the bellflower with 75% ethanol, and clean and disinfect the tray and the inner cavity of the device where the bellflower is placed. Place the bellflower on a ceramic tray with EPE pearl cotton pads. (2) Place the fresh bellflower in a preservation device equipped with a low-frequency polarized electric field and a static magnetic field. The output voltage of the low-frequency polarized electric field is 3000 V, the current is 5 mA, and the frequency is 50 Hz (vertical direction). The bellflower is placed about 10 cm away from the electric field plate, and the field strength is about 30 kV / m. The magnetic field strength is set to 400 Gs (horizontal direction).

[0029] (3) The temperature conditions in the regulating device are 15℃ and the relative humidity is 75%. Samples are taken every three days during storage to determine the quality indicators of fresh Chinese medicinal materials.

[0030] Comparative Example 1: Preservation of fresh burdock (without low-frequency polarized electric field or static magnetic field) Compared with Example 1, the preservation device placed in step (2) of Example 1 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device without a low-frequency polarized electric field and a static magnetic field. All other operations are the same as in Example 1.

[0031] Comparative Example 2: Preservation of fresh Atractylodes lancea (without low-frequency polarized electric field or static magnetic field) Compared with Example 2, the preservation device placed in step (2) of Example 2 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device without a low-frequency polarized electric field and a static magnetic field. All other operations are the same as in Example 2.

[0032] Comparative Example 3: Preservation of fresh bellflower root (without low-frequency polarized electric field or static magnetic field) Compared with Example 3, the preservation device placed in step (2) of Example 3 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device without a low-frequency polarized electric field and a static magnetic field. All other operations are the same as in Example 3.

[0033] Comparative Example 4: Preservation of fresh burdock (without low-frequency polarized electric field) Compared with Example 1, the preservation device placed in step (2) of Example 1 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device with a static magnetic field, and the magnetic field strength is set to 400Gs (horizontal direction). All other operations are the same as in Example 1.

[0034] Comparative Example 5: Preservation of fresh Atractylodes lancea (without low-frequency polarization electric field) Compared with Example 2, the preservation device placed in step (2) of Example 2 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device with a static magnetic field, and the magnetic field strength is set to 400Gs (horizontal direction). All other operations are the same as in Example 2.

[0035] Comparative Example 6: Preservation of fresh bellflower root (without low-frequency polarized electric field) Compared with Example 3, the preservation device placed in step (2) of Example 3 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device with a static magnetic field, and the magnetic field strength is set to 400Gs (horizontal direction). All other operations are the same as in Example 3.

[0036] Comparative Example 7: Preservation of Fresh Burdock (without static magnetic field) Compared with Example 1, the preservation device in step (2) of Example 1, which was placed in a preservation device equipped with a low-frequency polarized electric field and a static magnetic field, was changed to a preservation device equipped with a low-frequency polarized electric field. The output voltage of the low-frequency polarized electric field was 3000V, the current was 5mA, and the frequency was 50Hz (vertical direction). The burdock was placed at a distance of about 10cm from the electric field plate, and the field strength was about 30kV / m. All other operations were the same as in Example 1.

[0037] Comparative Example 8: Preservation of fresh Atractylodes lancea (without static magnetic field) Compared with Example 2, the preservation device placed in step (2) of Example 2 with a low-frequency polarized electric field and a static magnetic field is changed to a preservation device with a low-frequency polarized electric field. The output voltage of the low-frequency polarized electric field is 3000V, the current is 5mA, and the frequency is 50Hz (vertical direction). Atractylodes lancea is placed at a distance of about 10cm from the electric field plate, and the field strength is about 30kV / m. All other operations are the same as in Example 2.

[0038] Comparative Example 9: Preservation of fresh bellflower root (without static magnetic field) Compared with Example 3, the preservation device in step (2) of Example 3, which was placed in a preservation device equipped with a low-frequency polarized electric field and a static magnetic field, was changed to a preservation device equipped with a low-frequency polarized electric field. The output voltage of the low-frequency polarized electric field was 3000V, the current was 5mA, and the frequency was 50Hz (vertical direction). The lily bulb was placed about 10cm away from the electric field plate, and the field strength was about 30kV / m. All other operations were the same as in Example 3.

[0039] Comparative Example 10: Preservation of fresh burdock (magnetic field strength 200Gs) Compared with Example 1, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 1 are changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the burdock is placed at a distance of about 10 cm from the electric field plate, and the field strength is about 30 kV / m; the magnetic field strength is set to 200 Gs, and the rest of the operation is the same as in Example 1.

[0040] Comparative Example 11: Preservation of fresh burdock (magnetic field strength 600 Gs) Compared with Example 1, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 1 are changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the burdock is placed at a distance of about 10 cm from the electric field plate, and the field strength is about 30 kV / m; the magnetic field strength is set to 600 Gs, and the rest of the operation is the same as in Example 1.

[0041] Comparative Example 12: Preservation of fresh burdock (field strength 60 kV / m) Compared with Example 1, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 1 are changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the burdock is placed at a distance of about 5 cm from the electric field plate, and the field strength is about 60 kV / m; the magnetic field strength is set to 400 Gs, and the rest of the operation is the same as in Example 1.

[0042] Comparative Example 13: Preservation of fresh burdock (field strength 10 kV / m) Compared with Example 1, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 1 are changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the burdock is placed at a distance of about 30 cm from the electric field plate, and the field strength is about 10 kV / m; the magnetic field strength is set to 400 Gs, and the rest of the operation is the same as in Example 1.

[0043] Comparative Example 14: Preservation of fresh bellflower root (magnetic field strength 200 Gs) Compared with Example 3, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 3 were changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the Platycodon grandiflorus was placed about 10 cm away from the electric field plate, and the field strength was about 30 kV / m; the magnetic field strength was set to 200 Gs, and the rest of the operation was the same as in Example 3.

[0044] Comparative Example 15: Preservation of fresh bellflower root (magnetic field strength 600 Gs) Compared with Example 3, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 3 were changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the Platycodon grandiflorus was placed about 10 cm away from the electric field plate, and the field strength was about 30 kV / m; the magnetic field strength was set to 600 Gs, and the rest of the operation was the same as in Example 3.

[0045] Comparative Example 16: Preservation of fresh bellflower root (field strength 60 kV / m) Compared with Example 3, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 3 were changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the Platycodon grandiflorus was placed about 5 cm away from the electric field plate, and the field strength was about 60 kV / m; the magnetic field strength was set to 400 Gs, and the rest of the operation was the same as in Example 3.

[0046] Comparative Example 17: Preservation of fresh bellflower root (field strength 10 kV / m) Compared with Example 3, the parameters of the low-frequency polarized electric field and static magnetic field in step (2) of Example 3 were changed to the output voltage of the low-frequency polarized electric field being 3000 V, the current being 5 mA, and the frequency being 50 Hz; the Platycodon grandiflorus was placed at a distance of about 30 cm from the electric field plate, with an electric field strength of about 10 kV / m; the magnetic field strength was set to 400 Gs, and the rest of the operations were the same as in Example 3.

[0047] The results are shown in the figure: Figure 2 This is a graph showing the weight loss rate of fresh burdock stored for 12 days in Examples 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13, as shown. Figure 2 As shown, the weight loss rate in the embodiment was significantly lower than that in the comparative example, meaning that the combined effect of low-frequency polarized electric field and static magnetic field under the optimal parameter ratio was better than that of the untreated group, the single physical field treatment group, and other non-optimized parameter combination groups. This figure visually demonstrates that the treatment method of combining low-frequency polarized electric field and static magnetic field with specific parameter ratios of the present invention can significantly slow down the water loss and browning of burdock.

[0048] Figure 3This is a graph showing the changes in SOD enzyme activity of fresh burdock stored for 12 days in Examples 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13. In the early stages of storage, influenced by postharvest stress, the SOD enzyme activity in Example 1 showed a trend of first increasing and then decreasing, and was significantly higher than that in the comparative examples throughout the later stages of storage. In contrast, the enzyme activity levels of Comparative Examples 4 and 7 were better than those of Comparative Example 1, but still significantly lower than those of Example 1. This strongly confirms that while single magnetic or electric field treatments are effective, they cannot achieve the synergistic effect of combined electromagnetic treatment, indicating a significant synergistic effect between low-frequency polarized electric and magnetic fields. Furthermore, the enzyme activity level in Example 1 was also significantly higher than that in Comparative Examples 10, 11, 12, and 13, indicating that only under specific optimal parameter ratios can this synergistic effect effectively activate the antioxidant defense system of fresh medicinal materials, maintain its stability during storage, reduce oxidative damage, maintain the quality of the medicinal materials, and delay aging.

[0049] Figure 4 This diagram shows the changes in POD enzyme activity in fresh burdock stored for 12 days in Examples 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13. Compared to the comparative examples, Example 1 showed the strongest POD activity, which remained significantly higher than all other groups throughout the later stages of storage. The POD activity in the comparative examples initially increased only slightly and then decreased, indicating limited antioxidant response and an inability to effectively cope with continuous oxidative stress. This demonstrates that under specific optimal parameter ratios, the synergistic effect of the low-frequency polarized electric field and static magnetic field helps activate the POD enzyme, enabling it to efficiently remove peroxides from tissues during the later stages of storage, thereby alleviating oxidative stress damage to cell membranes, effectively maintaining the freshness of burdock, and delaying tissue aging.

[0050] Figure 5 , 6 This is a graph showing the changes in total flavonoids and total phenols in fresh burdock stored for 12 days in Examples 1 and Comparative Examples 1, 4, 7, 10, 11, 12, and 13. Figure 8 This is a graph showing the change in total phenolic content of fresh Platycodon grandiflorus stored for 12 days in Examples 3 and Comparative Examples 3, 6, 9, 14, 15, 16, and 17. As shown in the figure, the synergistic effect of the low-frequency polarized electric field and the static magnetic field under the optimal ratio parameters has a significant effect on the retention of bioactive components in fresh Chinese medicinal materials. Under the optimal ratio parameters, the examples effectively delayed the degradation of total phenols and total flavonoids, maintaining a high content of medicinal components, significantly higher than that of the comparative examples. Although the combination of low-frequency polarized electric field and static magnetic field with other parameter ratios prevented the loss of phenolic and flavonoid components to some extent, the effect was significantly lower than that of the synergistic treatment of low-frequency polarized electric field and static magnetic field under the optimal parameter ratio.

[0051] Figure 7The comparison shows the mold growth of fresh Atractylodes lancea after 12 days of storage in Example 2 and Comparative Example 2. In Comparative Example 2, the untreated group developed white, velvety mycelia on the surface after 12 days of storage, the epidermis softened, and an off-odor was produced. In contrast, Example 2 showed no signs of mold growth on the surface, maintained good tissue firmness, and preserved high commercial quality. This indicates that the combined low-frequency polarized electric field and static magnetic field method of this invention can inhibit the growth of microorganisms in Chinese medicinal materials.

[0052] Figure 9 The graph shows the changes in total saponin content of fresh Platycodon grandiflorus stored for 12 days in Examples 3 and Comparative Examples 3, 6, 9, 14, 15, 16, and 17. As shown in the figure, under the optimal ratio parameters, the synergistic effect of the low-frequency polarized electric field and static magnetic field in Example 3 inhibits free radical oxidation, making the saponin structure less prone to breakage. This significantly inhibits the degradation of total saponins during storage, reduces the loss of active medicinal ingredients in Platycodon grandiflorus, and has the best effect on maintaining the quality of fresh Chinese medicinal materials. The effects of other parameter ratios are all lower than the optimal synergistic ratio. The synergistic treatment of low-frequency polarized electric field and static magnetic field under the optimal parameter ratio of this invention has a significant effect on enriching the active ingredients of fresh Chinese medicinal materials and rhizomes, maintaining their high nutritional and medicinal value.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. However, the above description is merely a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

Claims

1. A combined preservation method for fresh Chinese medicinal herbs, characterized in that, Includes the following steps: Place the cleaned and disinfected fresh Chinese medicinal herbs in a storage container; In the storage device, a low-frequency polarized electric field and a static magnetic field are simultaneously applied to the fresh Chinese medicinal materials; The parameters for applying the low-frequency polarized electric field are: output voltage 3000 V, current 1-5 mA, frequency 50-60 Hz, electric field strength 25-35 kV / m; and the strength of the applied static magnetic field is 350-450 Gs.

2. The combined preservation method for fresh Chinese medicinal materials according to claim 1, characterized in that, The direction of the low-frequency polarized electric field is perpendicular to the main plane on which the Chinese medicinal materials are placed.

3. The combined preservation method for fresh Chinese medicinal materials according to claim 1, characterized in that, The direction of the static magnetic field is parallel to the main plane on which the Chinese medicinal materials are placed.

4. The combined preservation method for fresh Chinese medicinal materials according to claim 1, characterized in that, The direction of the low-frequency polarized electric field is orthogonal to the direction of the static magnetic field.

5. The combined preservation method for fresh Chinese medicinal materials according to claim 1, characterized in that, The low-frequency polarized electric field has an output voltage of 3000 V, a current of 5 mA, a frequency of 50 Hz, and an electric field strength of 30 kV / m; the static magnetic field has a strength of 400 Gs.

6. The combined preservation method for fresh Chinese medicinal materials according to any one of claims 1-5, characterized in that, The ambient temperature inside the storage device is 12-15℃, and the relative humidity is 75-80%.

7. The combined preservation method for fresh Chinese medicinal materials according to claim 6, characterized in that, The ambient temperature inside the storage device is 15°C and the relative humidity is 75%.

8. A combined preservation device for implementing the method of claim 1, characterized in that, This includes a constant temperature and humidity refrigerator, an electric field component, and a magnetic field component.

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