Eucommia tea and preparation method thereof

Abstract

The present invention relates to a eucommia tea and a preparation method thereof, and relates to the technical field of eucommia tea. The preparation method comprises the following steps: pulverizing and screening eucommia leaves to obtain eucommia leaf powder; subjecting the eucommia leaf powder to low-temperature plasma treatment to obtain pretreated eucommia leaf powder; adding the pretreated eucommia leaf powder to water for vacuum distillation extraction to obtain an extract; concentrating and drying the extract to obtain the eucommia tea. The present invention improves the dissolution behavior of eucommia leaves by subjecting the eucommia leaves to low-temperature plasma pretreatment, which is beneficial to the dissolution rate of effective components in the extraction process; and at the same time, combined with the vacuum distillation extraction technology under appropriate parameters, the damage of high temperature to the active components is reduced, which not only significantly increases the content of the target active components in the obtained eucommia tea, but also improves its appearance, color and taste, making up for the shortcomings of the existing eucommia tea.

Description

Technical Field

[0001] The invention relates to the technical field of eucommia tea, in particular to eucommia tea and a preparation method thereof. Background Art

[0002] Eucommia ulmoides, as a precious traditional Chinese medicine with a long history, has been widely used in the medical field since it was recorded in Shennong's Herbal Classic. Its unique medicinal value of nourishing the liver and kidney, strengthening bones and tendons, and lowering blood pressure is recognized by the general public. Among them, Eucommia ulmoides tea produced with Eucommia ulmoides leaves as raw materials does not contain theophylline and caffeine, but is rich in active ingredients such as aucubin and geniposide, and has high drinking value. Regular drinking of Eucommia ulmoides tea can effectively reduce high blood pressure and high blood lipids, and can also cleanse the intestines and detoxify, with extremely high medical and health care effects.

[0003] At present, the preparation method of existing Eucommia tea and series of beverages generally adopts the traditional green tea withering and frying process, and is made by rolling, drying and heating. This type of Eucommia tea mainly has the following two important problems: 1) First, the active ingredients of Eucommia leaves cannot be fully dissolved in water when brewing, and the utilization rate of active ingredients is not high, which makes it difficult to achieve the ideal health care effect; 2) Eucommia leaves themselves have grassy smell and astringency that are difficult to remove, which affects the taste of Eucommia tea; and the tea soup formed is dark and dim, which greatly reduces the desire of consumers to taste tea. In the pursuit of the tea market with good color, fragrance and taste, this is undoubtedly a major shortcoming of Eucommia tea products. The existence of the above problems not only reduces the market competitiveness of Eucommia tea products, but also limits the further promotion and application of Eucommia tea and related Eucommia leaf beverage industries. Therefore, how to solve the problems of low utilization rate of active ingredients, poor taste and dim color of tea soup while retaining the unique flavor of Eucommia tea has become a problem that the current Eucommia tea industry needs to overcome. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a eucommia tea and a preparation method thereof.

[0005] In a first aspect, the present invention provides a method for preparing Eucommia tea, the preparation method comprising the following steps:

[0006] The eucommia leaves are crushed and sieved to obtain eucommia leaf powder;

[0007] The eucommia leaf powder is subjected to low-temperature plasma treatment to obtain pretreated eucommia leaf powder;

[0008] Adding the pretreated Eucommia leaf powder into water and performing vacuum distillation extraction to obtain an extract;

[0009] The extract is concentrated and dried to obtain the eucommia tea.

[0010] Furthermore, the mesh size of the crushed and screened sieve is 100 to 200 meshes.

[0011] Furthermore, the working condition parameters of the low-temperature plasma treatment include: using a glow discharge mode, the working medium is argon gas, the voltage is 150-200V, and the treatment time is 2-5 minutes.

[0012] Furthermore, the voltage is 170V and the processing time is 3.5 minutes.

[0013] Furthermore, the pretreated Eucommia leaf powder is added into water for vacuum distillation extraction to obtain an extract, which comprises the following process:

[0014] The pretreated eucommia leaf powder is added into water accounting for 5 to 10 times the weight of the eucommia leaf powder and mixed to obtain a mixed liquid;

[0015] Under the conditions of a temperature of 42° C. to 48° C. and a pressure of 3 to 7 KPa, the mixed liquid is subjected to a first reduced pressure distillation extraction, and when the volume of the distillate is half the volume of the initial amount of water added, the distillation is stopped to obtain a first distillate and a remaining liquid;

[0016] Adding the same volume of water as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 59° C. to 64° C. and a pressure of 14 to 18 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain the first distillate;

[0017] The first distillate and the second distillate are combined to obtain the extract.

[0018] Furthermore, the working condition parameters of the first vacuum distillation extraction include: temperature of 46° C. and pressure of 5 KPa.

[0019] Furthermore, the working condition parameters of the second reduced pressure distillation extraction include: temperature of 62° C. and pressure of 16 KPa.

[0020] Furthermore, the drying method includes at least one of spray drying and vacuum freeze drying.

[0021] Furthermore, the extract is concentrated and dried before being tableted.

[0022] In a second aspect, the present invention provides a eucommia tea, which is prepared by the preparation method of the eucommia tea described in any one of the first aspects.

[0023] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0024] The embodiment of the present invention provides a method for preparing eucommia tea. The present invention improves the dissolution behavior of eucommia leaves by performing low-temperature plasma pretreatment on the leaves, which is beneficial to the dissolution rate of the effective ingredients in the extraction process; at the same time, the vacuum distillation extraction technology under appropriate parameters is used to reduce the damage of high temperature to the active ingredients, which not only significantly increases the content of the target active ingredients in the obtained eucommia tea, but also improves its appearance, color and taste, thereby making up for the shortcomings of the existing eucommia tea. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 The present invention provides a schematic flow chart of a method for preparing Eucommia tea according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0029] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0030] In a first aspect, the present invention provides a method for preparing Eucommia ulmoides tea, such as Figure 1 As shown, the preparation method comprises the following steps:

[0031] The eucommia leaves are crushed and sieved to obtain eucommia leaf powder;

[0032] The eucommia leaf powder is subjected to low-temperature plasma treatment to obtain pretreated eucommia leaf powder;

[0033] Adding the pretreated Eucommia leaf powder into water and performing vacuum distillation extraction to obtain an extract;

[0034] The extract is concentrated and dried to obtain the eucommia tea.

[0035] The embodiment of the present invention provides a method for preparing eucommia tea. The present invention improves the dissolution behavior of eucommia leaves by performing low-temperature plasma pretreatment on the leaves, which is beneficial to the dissolution rate of the effective ingredients in the extraction process; at the same time, the vacuum distillation extraction technology under appropriate parameters is used to reduce the damage of high temperature to the active ingredients, which not only significantly increases the content of the target active ingredients in the obtained eucommia tea, but also improves its appearance, color and taste, thereby making up for the shortcomings of the existing eucommia tea.

[0036] In some specific embodiments, the eucommia leaves in the present invention are preferably dried eucommia leaves or fresh eucommia leaves obtained by vacuum freeze-drying.

[0037] In some specific embodiments, the mesh size of the crushed and sieved sieve is 100-200 meshes.

[0038] In some specific embodiments, the working condition parameters of the low temperature plasma treatment include: using a glow discharge mode, the working medium is argon, the voltage is 150-200V, and the treatment time is 2-5 minutes. Preferably, the voltage is 170V, and the treatment time is 3.5 minutes.

[0039] In some specific embodiments, the step of adding the pretreated Eucommia leaf powder to water for vacuum distillation extraction to obtain an extract comprises the following process:

[0040] The pretreated eucommia leaf powder is added into water accounting for 5 to 10 times the weight of the eucommia leaf powder and mixed to obtain a mixed liquid;

[0041] Under the conditions of a temperature of 42° C. to 48° C. and a pressure of 3 to 7 KPa, the mixed liquid is subjected to a first reduced pressure distillation extraction, and when the volume of the distillate is half the volume of the initial amount of water added, the distillation is stopped to obtain a first distillate and a remaining liquid;

[0042] Adding the same volume of water as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 59° C. to 64° C. and a pressure of 14 to 18 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain the first distillate;

[0043] The first distillate and the second distillate are combined to obtain the extract.

[0044] The inventors have found through research that by controlling the temperature and pressure of distillation extraction, the extraction rate of target active ingredients such as aucubin can be significantly improved. Preferably, the working condition parameters of the first vacuum distillation extraction include: temperature of 46°C and pressure of 5KPa; the working condition parameters of the second vacuum distillation extraction include: temperature of 62°C and pressure of 16KPa.

[0045] In some specific embodiments, the drying method includes at least one of spray drying and vacuum freeze drying, preferably spray drying, and the moisture content of the obtained Eucommia tea powder is about 2%.

[0046] In some specific embodiments, the extract is concentrated and dried before tableting. In the present invention, the obtained Eucommia tea powder can be further tableted in a conventional manner to form tea slices, which are convenient for batch transportation and storage.

[0047] In a second aspect, based on the same inventive concept, the present invention provides a Eucommia tea, which is prepared by the preparation method of Eucommia tea described in any one of the first aspects.

[0048] The Eucommia tea provided by the present invention has a high content of active ingredients such as aucubin and has high drinking value; the tea soup is bright and transparent, the Eucommia flavor is mellow and has no grassy smell and astringency, and the appearance, color and taste are good. At the same time, the Eucommia tea is prepared based on the preparation method described in any one of the first aspects, so it has at least the beneficial effects of any one of the schemes of the first aspect, which will not be repeated here one by one.

[0049] It should be noted that, in the Eucommia tea and preparation method thereof provided by the embodiments of the present invention, the raw materials involved, unless otherwise specified or limited, can all be commercially available products; at the same time, the process steps and parameters involved, such as crushing and screening, low-temperature plasma treatment, vacuum distillation extraction, concentration and drying, can all be carried out according to the existing Eucommia tea preparation process or using existing equipment in a conventional manner unless otherwise specified and specified.

[0050] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0051] Example 1

[0052] This example provides a Eucommia tea, and the preparation method of the Eucommia tea comprises the following steps:

[0053] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0054] Step (2): placing the Eucommia leaf powder obtained in step (1) in a cavity of a low-temperature plasma treatment device, evacuating the cavity, and when the vacuum degree of the cavity reaches below 10 Pa, introducing argon gas, and performing glow discharge treatment at a voltage of 170 V for 3.5 minutes to obtain pretreated Eucommia leaf powder;

[0055] Step (3): adding the pretreated Eucommia leaf powder obtained in step (2) to water accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing a first reduced pressure distillation extraction on the mixed liquid at a temperature of 46° C. and a pressure of 5 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial amount of water added to obtain a first distillate and a remaining liquid; adding water of the same volume as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 62° C. and a pressure of 16 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial amount of water added to obtain a first distillate; combining the first distillate and the second distillate to obtain the extract;

[0056] Step (4): vacuum concentrate the extract obtained in step (3) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0057] Example 2

[0058] This example provides a Eucommia tea, and the preparation method of the Eucommia tea comprises the following steps:

[0059] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0060] Step (2): placing the Eucommia leaf powder obtained in step (1) in a cavity of a low-temperature plasma treatment device, evacuating the cavity, and when the vacuum degree of the cavity reaches below 10 Pa, introducing argon gas, and performing glow discharge treatment at a voltage of 150 V for 5 minutes to obtain pretreated Eucommia leaf powder;

[0061] Step (3): adding the pretreated Eucommia leaf powder obtained in step (2) to water accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing a first reduced pressure distillation extraction on the mixed liquid at a temperature of 42° C. and a pressure of 3 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate and a remaining liquid; adding water of the same volume as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 59° C. and a pressure of 14 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate; combining the first distillate and the second distillate to obtain the extract;

[0062] Step (4): vacuum concentrate the extract obtained in step (3) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0063] Example 3

[0064] This example provides a Eucommia tea, and the preparation method of the Eucommia tea comprises the following steps:

[0065] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0066] Step (2): placing the Eucommia leaf powder obtained in step (1) in a cavity of a low-temperature plasma treatment device, evacuating the cavity, and when the vacuum degree of the cavity reaches below 10 Pa, introducing argon gas, and performing glow discharge treatment at a voltage of 200 V for 2 minutes to obtain pretreated Eucommia leaf powder;

[0067] Step (3): adding the pretreated Eucommia leaf powder obtained in step (2) to water accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing a first reduced pressure distillation extraction on the mixed liquid at a temperature of 48° C. and a pressure of 7 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate and a remaining liquid; adding water of the same volume as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 64° C. and a pressure of 18 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate; combining the first distillate and the second distillate to obtain the extract;

[0068] Step (4): vacuum concentrate the extract obtained in step (3) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0069] Comparative Example 1

[0070] This example provides a Eucommia tea and a preparation method thereof, which is different from Example 1 only in that no low-temperature plasma treatment is performed; the remaining steps and parameters are the same.

[0071] The preparation method of the above-mentioned Eucommia tea comprises the following steps:

[0072] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0073] Step (2): adding the Eucommia leaf powder obtained in step (1) to water accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing a first reduced pressure distillation extraction on the mixed liquid at a temperature of 46° C. and a pressure of 5 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial amount of water added to obtain a first distillate and a remaining liquid; adding water of the same volume as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 62° C. and a pressure of 16 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial amount of water added to obtain a first distillate; combining the first distillate and the second distillate to obtain the extract;

[0074] Step (3): vacuum concentrate the extract obtained in step (2) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0075] Comparative Example 2

[0076] This example provides a Eucommia tea and a preparation method thereof, which is different from Example 1 only in that the temperature of the first distillation extraction and the second distillation extraction are both 75° C. and the pressure are both 30 KPa; the remaining steps and parameters are the same.

[0077] The preparation method of the above-mentioned Eucommia tea comprises the following steps:

[0078] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0079] Step (2): placing the Eucommia leaf powder obtained in step (1) in a cavity of a low-temperature plasma treatment device, evacuating the cavity, and when the vacuum degree of the cavity reaches below 10 Pa, introducing argon gas, and performing glow discharge treatment at a voltage of 170 V for 3.5 minutes to obtain pretreated Eucommia leaf powder;

[0080] Step (3): adding the pretreated Eucommia leaf powder obtained in step (2) to water accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing a first reduced pressure distillation extraction on the mixed liquid at a temperature of 75° C. and a pressure of 30 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate and a remaining liquid; adding water of the same volume as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 75° C. and a pressure of 30 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a first distillate; combining the first distillate and the second distillate to obtain the extract;

[0081] Step (4): vacuum concentrate the extract obtained in step (3) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0082] Comparative Example 3

[0083] This example provides a Eucommia tea, and the preparation method of the Eucommia tea comprises the following steps:

[0084] Step (1): grinding the dried leaves of Eucommia ulmoides and passing through a 100-mesh sieve to obtain Eucommia ulmoides leaf powder;

[0085] Step (2): adding the Eucommia leaf powder obtained in step (1) to 50% ethanol accounting for 8 times the weight of the Eucommia leaf powder and mixing them to obtain a mixed liquid; performing ultrasonic-assisted extraction for 45 minutes at a temperature of 50° C. and an ultrasonic power of 800 W, filtering and collecting the filtrate, repeatedly extracting the obtained filter residue once, combining the filtrate, and obtaining the extract;

[0086] Step (3): vacuum concentrate the extract obtained in step (2) at a temperature of 60° C. and a vacuum degree of 0.09 MPa to obtain a concentrated solution with a solid content of 35 wt %; spray dry the concentrated solution to obtain the Eucommia tea.

[0087] Test Case

[0088] In this example, the content of active ingredients in the Eucommia tea obtained in the above Examples 1 to 3 and Comparative Examples 1 to 3 was tested, and the test results are shown in Table 1.

[0089] Table 1

[0090] Test samples Aucubin content (%) Example 1 16.2 Example 2 14.9 Example 3 15.4 Comparative Example 1 11.5 Comparative Example 2 10.7 Comparative Example 3 8.8

[0091] As shown in Table 1, compared with Comparative Examples 1-3, the present invention significantly increases the content of target active ingredients such as aucubin in the obtained Eucommia tea by low-temperature plasma treatment technology and vacuum distillation extraction technology under appropriate parameters, and has high drinking value. At the same time, the content of geniposide in the Eucommia tea obtained in Examples 1 to 3 of the present invention is also relatively high, which are 14.3%, 12.1% and 12.9% respectively.

[0092] In addition, the sensory test and evaluation were performed on the Eucommia tea obtained in the above Examples 1 to 3 and Comparative Examples 1 to 3. The test results are shown in Table 2.

[0093] Table 2

[0094]

[0095] In summary, the embodiments of the present invention provide a eucommia tea and a preparation method thereof, which improves the dissolution behavior of eucommia leaves by subjecting them to low-temperature plasma pretreatment, thereby facilitating the dissolution rate of effective ingredients during the extraction process; at the same time, the vacuum distillation extraction technology under appropriate parameters is used to reduce the damage of high temperature to the active ingredients, which not only significantly increases the content of the target active ingredients in the obtained eucommia tea, but also improves its appearance, color and taste, thereby making up for the shortcomings of the existing eucommia tea.

[0096] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0097] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing Eucommia ulmoides tea, characterized in that: The preparation method comprises the following steps: The eucommia leaves are crushed and sieved to obtain eucommia leaf powder; The eucommia leaf powder is subjected to low-temperature plasma treatment to obtain pretreated eucommia leaf powder; The pretreated eucommia leaf powder is added into water accounting for 5 to 10 times the weight of the eucommia leaf powder and mixed to obtain a mixed liquid; Under the conditions of a temperature of 42° C. to 48° C. and a pressure of 3 to 7 KPa, the mixed liquid is subjected to a first reduced pressure distillation extraction, and when the volume of the distillate is half the volume of the initial amount of water added, the distillation is stopped to obtain a first distillate and a remaining liquid; Adding the same volume of water as the first distillate to the remaining liquid, and then performing a second distillation extraction at a temperature of 59° C. to 64° C. and a pressure of 14 to 18 KPa, and stopping the distillation when the volume of the distillate is half the volume of the initial water added to obtain a second distillate; combining the first distillate and the second distillate to obtain an extract; Concentrating and drying the extract to obtain the Eucommia tea; The working condition parameters of the low-temperature plasma treatment include: adopting a glow discharge mode, the working medium is argon gas, the voltage is 150-200V, and the treatment time is 2-5 minutes.

2. The method for preparing Eucommia tea according to claim 1, characterized in that: The mesh number of the crushed and sieved sieve is 100-200 meshes.

3. The method for preparing Eucommia tea according to claim 1, characterized in that: The voltage is 170V, and the treatment time is 3.5 minutes.

4. The method for preparing Eucommia tea according to claim 1, characterized in that: The working condition parameters of the first vacuum distillation extraction include: temperature of 46° C. and pressure of 5 KPa.

5. The method for preparing Eucommia tea according to claim 1, characterized in that: The working condition parameters of the second reduced pressure distillation extraction include: temperature of 62° C. and pressure of 16 KPa.

6. The method for preparing Eucommia tea according to claim 1, characterized in that: The drying method includes at least one of spray drying and vacuum freeze drying.

7. The method for preparing Eucommia tea according to any one of claims 1 to 6, characterized in that: The extract is concentrated and dried and then compressed into tablets.

8. A Eucommia tea, characterized in that The eucommia tea is prepared by the preparation method of the eucommia tea according to any one of claims 1 to 7.

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