CN107373278B - A kind of green tea fresh-keeping gas and its preparation method - Google Patents

Abstract

The present invention relates to fresh-keeping gas fields, provide a kind of green tea fresh-keeping gas comprising diluent gas and effect gas, effect gas include carbon dioxide, methane and vaporous water, and diluent gas is inert gas.The green tea fresh-keeping gas is to the of good preservation effect of green tea.The present invention also provides a kind of preparation methods of green tea fresh-keeping gas, are mixed for preparing above-mentioned green tea fresh-keeping gas, including by diluent gas, carbon dioxide, methane and vaporous water.The preparation method is simple.

Description

A kind of green tea fresh-keeping gas and preparation method thereof

technical field

The invention relates to the field of fresh-keeping gas, in particular to a green tea fresh-keeping gas and a preparation method thereof.

Background technique

Tea is a natural, non-alcoholic beverage that is popular among consumers. Green tea is made from suitable new shoots of tea trees through typical processes such as greening, rolling, and drying. Its dry tea color and brewed tea paste and the bottom of the leaves take green as the main tone, hence the name green tea. The characteristics of green tea retain more natural substances of fresh leaves. Among them, tea polyphenols and caffeine retain more than 85% of fresh leaves, chlorophyll retains about 50%, and vitamin loss is also less, thus forming the characteristics of green tea "clear soup and green leaves, strong taste convergence". Scientific research has shown that the natural substances retained in green tea have certain effects on anti-aging, anti-cancer, anti-cancer, sterilization, and anti-inflammatory. Therefore green tea preservation technology is particularly important for the development of green tea. Because dry green tea leaves are loose and porous, with a large surface area, they have strong moisture absorption, odor absorption, and strong oxidation capabilities. During the storage of green tea, due to packaging and sealing operations and other reasons, it is difficult to extract the air, and it is easy to absorb harmful impurities such as oxygen and water in the air, which will cause the green tea to age and change qualitatively. If it is packaged in a vacuum state, the packaging bag will shrink into a hard block, which will affect the shape integrity of high-grade famous tea to a certain extent.

Contents of the invention

The invention provides a green tea fresh-keeping gas, which aims to improve the general problem of the green tea fresh-keeping effect of the existing green tea fresh-keeping methods.

The invention provides a method for preparing green tea fresh-keeping gas, which is simple.

The present invention is achieved like this:

A fresh-keeping gas for green tea comprises diluting gas and functional gas, wherein the functional gas includes carbon dioxide, methane and gaseous water, and the diluting gas is an inert gas.

Further, in a preferred embodiment of the present invention, the volume ratio of the dilution gas to the functional gas is 9990-9995:5-10.

Further, in a preferred embodiment of the present invention, the volume ratio of carbon dioxide, methane and gaseous water in the functional gas is 200-300:5-10:10-30.

Further, in a preferred embodiment of the present invention, the diluent gas is nitrogen.

A method for preparing green tea fresh-keeping gas, which is used to prepare the above-mentioned green tea fresh-keeping gas, comprising mixing diluent gas, carbon dioxide, methane and gaseous water.

Further, in a preferred embodiment of the present invention, mixing the dilution gas, carbon dioxide, methane and gaseous water is to fill the dilution gas, carbon dioxide, methane and gaseous water into the same vacuum container one by one, and during the filling process Monitor the pressure in the vacuum container to control the filling amount of each component gas.

Further, in a preferred embodiment of the present invention, each component gas is charged into the vacuum container to make the vacuum container reach the set pressure value, then close the vacuum container inlet valve, and then vacuumize the pipeline connected to the vacuum container. Open the intake valve and introduce the next group of gases.

The beneficial effects of the present invention are: the green tea fresh-keeping gas obtained by the above-mentioned design in the present invention can effectively prevent green tea from deteriorating because the inert gas can form a protective film on the surface of the green tea in the packaging bag to isolate the air, and carbon dioxide can effectively inhibit the aging of green tea. The growth and reproduction of microorganisms such as bacteria and molds in green tea can slow down the oxidative deterioration of tea polyphenols and caffeine in green tea. Methane can play a role in color protection. Water can protect the green tea from deformation and fragmentation. The green tea fresh-keeping gas composed of the above-mentioned components can effectively prevent the green tea from contacting with the air, reduce the harmful impurities in the green tea packaging bag to the limit, effectively prevent the aging and qualitative change of the green tea, and control the growth and reproduction of bacteria in the green tea to protect the green tea from being damaged. Fragmentation, no discoloration and long-term green tea taste unchanged, so as to achieve the purpose of long-term freshness of green tea. The preparation method of the green tea fresh-keeping gas obtained through the above design of the present invention is used to prepare the green tea fresh-keeping gas provided by the present invention, and the operation is simple.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a preparation device for green tea fresh-keeping gas provided by an embodiment of the present invention.

Icons: 100-preparation device for green tea fresh-keeping gas; 110-gas supply pipeline; 120-vacuum container; 121-intake valve; 130-vacuum pump; 140-first pressure gauge; 141-first pressure gauge valve; Two pressure gauges; 151-high pressure gauge; 152-medium pressure gauge; 153-low pressure gauge; 154-raw material gas pressure gauge; 160-vacuum instrument; 171-first component gas tank; Gas tank; 173-third component gas tank; 174-fourth component gas tank.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In describing the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate an orientation or The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

A green tea fresh-keeping gas provided in the embodiments of the present invention and its preparation method and preparation device are described in detail below.

A fresh-keeping gas for green tea, which includes dilution gas and functional gas, wherein the functional gas includes carbon dioxide, methane and gaseous water.

The diluting gas is mainly used to dilute the functional gas, which is an inert gas that does not react with the functional gas and green tea and is not absorbed by the green tea. The inert gas referred to in this application refers to the gas which is not easy to react under normal temperature and pressure, including rare gas and nitrogen. The inert gas can form a protective film on the surface of the green tea in the packaging bag to isolate the air, and can effectively prevent the green tea from aging and deterioration. Further, the diluent gas is nitrogen, and the cost of nitrogen is lower than that of other inert gases, and since nitrogen is widely used in the food industry, its safety is more acceptable to consumers. Preferably, the nitrogen is food-grade nitrogen.

Carbon dioxide can effectively inhibit the growth and reproduction of microorganisms such as bacteria and molds in green tea, and can slow down the oxidative deterioration of tea polyphenols and caffeine in green tea. Methane can play a role in color protection. Water can protect the green tea from deformation and fragmentation. And the dilution gas cooperates with each component function gas to make the fresh-keeping effect of green tea good. Preferably, the carbon dioxide is food-grade carbon dioxide.

The green tea fresh-keeping gas composed of the above-mentioned components can effectively prevent the green tea from contacting with the air, reduce the harmful impurities in the green tea packaging bag to the limit, effectively prevent the aging and qualitative change of the green tea, and control the growth and reproduction of bacteria in the green tea to protect the green tea from being damaged. Fragmentation, no discoloration and long-term green tea taste unchanged, so as to achieve the purpose of long-term freshness of green tea.

It should be noted that the green tea fresh-keeping gas is also applicable to the fresh-keeping of other teas.

Further, the volume ratio of the dilution gas to the functional gas is 9990-9995:5-10. The diluent gas accounts for the majority of the green tea fresh-keeping gas components, which can isolate the air and play a preliminary role in keeping the green tea fresh, and the functional gases of each component cooperate with each other so that the green tea can be kept fresh under the storage conditions of the green tea fresh-keeping gas proposed by the present invention. It is relatively long-lasting, and the diluted gas and functional gas can achieve the effect of not wasting functional gas and having a better fresh-keeping effect under the condition of the above-mentioned ratio.

Further, the volume ratio of carbon dioxide, methane and gaseous water in the functional gas is 200-300:5-10:10-30. Although methane can play the role of color protection. Water can protect the green tea from deformation and fragmentation. However, if the content of the two is too high, it may affect the inhibitory effect of carbon dioxide on microorganisms, and if the content is too low, the preservation effect will not be good. If the content of carbon dioxide is too low, it will weaken its inhibitory effect on microorganisms, and if the content is too high, it may weaken the fresh-keeping effect of other component functional gases on green tea. Partial gas can play the best role to make the freshness of green tea the best.

A method for preparing green tea fresh-keeping gas, which is used to prepare the above-mentioned green tea fresh-keeping gas, comprising mixing diluent gas, carbon dioxide, methane and gaseous water. The preparation method is simple and easy to operate.

Specifically, mixing the diluent gas, carbon dioxide, methane and gaseous water is to fill the diluent gas, carbon dioxide, methane and gaseous water into the same vacuum container one by one, and monitor the pressure in the vacuum container during the filling process to control the components Gas charge. It should be noted that filling the diluent gas, carbon dioxide, methane and gaseous water into the same vacuum container one by one is filling one by one, and there is no specific filling sequence for each gas component. According to Dalton's law, the total pressure of green tea fresh-keeping gas is equal to the sum of the partial pressures of each component, so when each component gas is filled into the vacuum container, the pressure in the container is controlled to control the gas filling amount so that each component gas reaches the desired value. ratio required.

Further, each component gas is filled into the vacuum container to make the vacuum container reach the set pressure value, then close the vacuum container intake valve, vacuumize the pipeline connected to the vacuum container, then open the intake valve and enter the next group points of gas. Put the gas into the vacuum container and close the inlet valve after reaching the set pressure value. At this time, there is still the gas of the previous filling component in the pipeline connected to the vacuum container. Accurate enough, the pipeline is evacuated, the gas in it is pumped out, and then the inlet valve is opened to introduce the next gas into the vacuum container.

It should be noted that when each component gas is filled into the vacuum container, it should be noted that the gas pressure being filled should be higher than the pressure in the vacuum container to prevent the gas from flowing backward. At the same time, when the gas is filled into the vacuum container, the process of increasing the pressure should be carried out slowly, so as to avoid the inaccurate proportioning of the final components due to the temperature change in the vacuum container caused by the rapid pressure increase. The method for configuring green tea fresh-keeping gas provided by this application can also be used to configure other mixed gases. When a certain component of the gas to be configured needs to be diluted in large quantities, the operation can be repeated to make a certain component in the mixed gas reach the desired dilution content value .

From the above content, it can be seen that the preparation method of the green tea fresh-keeping gas is simple to operate, and the proportion of each component of the finally obtained green tea fresh-keeping gas is accurate.

As shown in Figure 1, the embodiment of the present invention also provides a green tea fresh-keeping gas preparation device 100, which is used to prepare the green tea fresh-keeping gas provided by the present invention, which includes an air supply pipeline 110, a vacuum container 120, a vacuum pump 130 and a first A pressure gauge 140. The first pressure gauge 140 is connected to the vacuum container 120 to measure the pressure of the vacuum container 120 , the vacuum container 120 is provided with an inlet valve 121 , the vacuum container 120 communicates with the gas supply pipeline 110 , and the vacuum pump 130 communicates with the gas supply pipeline 110 .

The first pressure gauge 140 is disposed between the intake valve 121 and the vacuum vessel 120 for measuring the pressure of the vacuum vessel 120 . The pipeline connecting the first pressure gauge 140 and the vacuum container 120 is also provided with a first pressure gauge valve 141 to close the first pressure gauge 140 , and the first pressure gauge valve 141 needs to be closed before the first pressure gauge 140 is disassembled.

One end of the gas supply pipeline 110 is connected with a first component gas tank 171, a second component gas tank 172, a third component gas tank 173, a fourth component gas tank 174 and a fifth component gas tank 175, and Separately filled with diluent gas, oxygen, gaseous water, carbon monoxide and carbon dioxide. A raw gas pressure gauge 154 for measuring the raw gas pressure is provided at one end of the gas supply pipeline 110 near the plurality of component gas tanks. When preparing green tea fresh-keeping gas, open the valve corresponding to a certain component gas tank and pass the gas into the vacuum container 120 through the gas supply pipeline 110. Under the monitoring of the first pressure gauge 140, when the gas pressure reaches the set value value, close the intake valve 121, turn on the vacuum pump 130 to evacuate the air supply pipeline 110, and then open the intake valve 121 and the valve corresponding to the next component gas tank to allow the next component to enter the air. The device has a simple structure and is easy to operate, and can more accurately prepare the green tea fresh-keeping gas.

Further, the number of vacuum containers 120 is 2 or more. The purpose of arranging multiple vacuum containers 120 is to improve the preparation efficiency of the green tea fresh-keeping gas. When one of the vacuum containers 120 is prepared, the filling of the next vacuum container 120 is directly continued without replacement.

Further, the preparation device 100 of green tea fresh-keeping gas further includes a second pressure gauge 150 , and the second pressure gauge 150 is arranged on the air delivery pipeline 110 . The second pressure gauge 150 is used to measure the pressure in the gas supply pipeline 110, and the operator adjusts the intake pressure through the pressure value of the gas supply pipeline 110 reflected by the second pressure gauge 150 to ensure that the intake pressure is greater than that in the vacuum container 120. The pressure can also be observed through the second pressure gauge 150 when the air supply pipeline 110 is evacuated, and the change of the internal air pressure can be used to determine whether it is exhausted.

Further, the second pressure gauge 150 includes a high-pressure gauge 151, a medium-pressure gauge 152, and a low-pressure gauge 153. The pressure in the air supply pipeline 110 varies greatly during the entire preparation process, so as to measure each operation process more accurately. For the pressure situation in the air delivery pipeline 110, the above-mentioned three pressure gauges with different measurement ranges are provided.

Further, the preparation device 100 of green tea fresh-keeping gas further includes a vacuum instrument 160 connected to the vacuum pump 130 . A vacuum gauge 160 is provided to detect the degree of vacuum, and then determine whether there is an air leak.

Example 1

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9990:10, and the ratio of carbon dioxide, methane and gaseous water is 200:5:10.

Example 2

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9990:5, and the ratio of carbon dioxide, methane and gaseous water is 300:6:20.

Example 3

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9991:9, and the ratio of carbon dioxide, methane and gaseous water is 250:10:30.

Example 4

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9992:8, and the ratio of carbon dioxide, methane and gaseous water is 210:7:15.

Example 5

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9993:7, and the ratio of carbon dioxide, methane and gaseous water is 250:9:13.

Example 6

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9994:6, and the ratio of carbon dioxide, methane and gaseous water is 180:6:25.

Example 7

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9990:5, and the ratio of carbon dioxide, methane and gaseous water is 260:9:25.

Example 8

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9991:8, and the ratio of carbon dioxide, methane and gaseous water is 280:8:18.

Example 9

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9990:8, and the ratio of carbon dioxide, methane and gaseous water is 230:8:23.

Example 10

The nitrogen contained in the first component gas tank 171, the carbon dioxide contained in the second component gas tank 172, the methane contained in the third component gas tank 173 and the gaseous water contained in the fourth component gas tank 174 Pass into the vacuum container 120 through the gas supply pipeline 110 one by one, in the process of passing each component gas into the vacuum container 120, after a certain component gas passes into the vacuum container 120, close the inlet valve 121 of the vacuum container 120, Start the vacuum pump 130 to evacuate the air supply pipeline 110, then open the valve corresponding to the next component gas tank and the air inlet valve 121 to feed the next component into the vacuum container 120 until all the gas is passed into the vacuum container 120 , get green tea fresh air. The volume ratio of diluent gas to functional gas in the green tea fresh-keeping gas is 9995:6, and the ratio of carbon dioxide, methane and gaseous water is 225:7:19.

Example 11

The operating conditions are the same as in Example 10, the only difference is that in the obtained green tea fresh-keeping gas, the volume ratio of diluent gas to functional gas is 9997:3, and the ratio of each functional gas is the same as in Example 10.

Example 12

The operating conditions are the same as in Example 10, the only difference is that in the obtained green tea fresh-keeping gas, the volume ratio of diluent gas to functional gas is 9985:12, and the ratios of each functional gas are the same as in Example 10.

Example 13

The operating conditions are the same as those in Example 10, the only difference being that in the green tea fresh-keeping gas obtained, the ratio of the functional gases carbon dioxide, methane and gaseous water is 100:7:19.

Example 14

The operating conditions are the same as in Example 10, the only difference being that in the green tea fresh-keeping gas obtained, the ratio of the functional gases carbon dioxide, methane and gaseous water is 225:5:5.

comparative example

Green tea is preserved in vacuum.

Experimental example

Get newly produced green tea of the same batch and the same type and divide it into 15 parts on average. Wherein 14 parts of green tea are placed in the container of the green tea fresh-keeping gas that embodiment 1-14 provides after being placed in vacuum again to normal pressure, at normal temperature. The green teas corresponding to the green tea fresh-keeping gases of Examples 1-14 are numbered 1-14 respectively. The remaining part of the 15 parts of green tea was stored at room temperature in the vacuum storage method mentioned in the comparative example, and the 15th part of green tea was numbered 15. After placing No. 1-15 green tea for 1 year, 50 tea lovers were selected to observe the color of No. 1-15 green tea and taste its taste after professional brewing. The color and luster is 100 points, and the mouthfeel is 100 points. And record the evaluation results in Table 1 and Table 2 respectively.

Table 1 No. 1-15 Green Tea Color Evaluation Results Population Statistics

Analyzing the above table, the average number of people who think the color of green tea numbered 1-10 is higher than 80 points is 45.7, while the number of people who think the color of green tea numbered 11 is higher than 80 points is only 36 people, which is significantly less than the number of people who think the color of green tea numbered 10 is higher than 80 points The number of people who thought that the color of No. 12 green tea was higher than 80 points was only 35 people, which was obviously less than the number of people who thought that the color of No. 10 was greater than 80 points. The number of people who think that the color of green tea No. 13 is higher than 80 points is 37 people, the number of people who think that the color of green tea No. 14 is higher than 80 points is 36 people, and the number of people who think that the color of No. 13 and No. 14 is higher than 80 points is also smaller than that of No. 10. The number of people with a score greater than 80.

And the ratio of the diluent gas and functional gas of embodiment 11 and embodiment 12 is outside the preferred protection scope required by the present invention, and its corresponding green tea fresh-keeping gas is used for the fresh-keeping of green tea and the fresh-keeping effect of green tea color and luster is obviously weaker than embodiment 10 provided freshness gas. It can be seen that the diluent gas and functional gas of the present invention can make the color of green tea better within the preferred range required by the present invention.

And the ratio of each component function gas of embodiment 13 and embodiment 14 is outside the scope of protection required by the present invention, and its corresponding green tea fresh-keeping gas is used for the fresh-keeping of green tea to the fresh-keeping effect of green tea color and luster obviously weaker than embodiment 10 Fresh air provided. It can be seen that the ratio of each component of the functional gas of the present invention can make the color of green tea better within the preferred range required by the present invention.

While comparative example 5 adopts vacuum preservation as the conventional preservation method of the existing green tea, the color and luster of the green tea corresponding to No. 15 is obviously not as good as that of No. 1-14. This shows that the green tea fresh-keeping gas provided by the invention has a good effect on the fresh-keeping of green tea color and luster.

Table 2 No. 1-15 Green Tea Taste Evaluation Results Population Statistics

Analyzing the above table, the average number of people who think the taste of green tea numbered 1-10 is higher than 80 points is 31.1, while the number of people who think the taste of green tea numbered 11 is higher than 80 points is only 19, which is significantly less than the number of people who think the taste of green tea numbered 10 is higher than 80 points Among the number of people, only 18 people think that the mouthfeel of No. 12 green tea is higher than 80 points, which is obviously less than the number of people who think that the mouthfeel of No. 10 is higher than 80 points. The number of people who think that the taste of green tea No. 13 is higher than 80 points is 21 people, the number of people who think that the taste of green tea No. 14 is higher than 80 points is 19 people, and the number of people who think that the taste of green tea No. 13 and No. 14 is higher than 80 points is also less than No. 10. The number of people with a score greater than 80.

And the ratio of the dilution gas and functional gas of embodiment 11 and embodiment 12 is outside the preferred protection range required by the present invention, and its corresponding green tea fresh-keeping gas is used for the fresh-keeping of green tea to the fresh-keeping effect of green tea mouthfeel obviously weaker than implementing Example 10 provides fresh air. It can be seen that the ratio of the diluent gas of the present invention to the functional gas can make the taste of green tea better within the preferred range required by the present invention.

And the ratio of each component function gas of embodiment 13 and embodiment 14 is outside the preferred protection range required by the present invention, and its corresponding green tea fresh-keeping gas is used for the fresh-keeping of green tea to the fresh-keeping effect of green tea mouthfeel obviously weaker than the implementation Example 10 provides fresh air. It can be seen that the ratio of each component of the functional gas of the present invention can make the mouthfeel of green tea better within the preferred range required by the present invention.

And comparative example 5 adopts vacuum preservation as the conventional preservation method of existing green tea, and the mouthfeel of its corresponding number 15 green tea is obviously not as good as number 1-14. This shows that the green tea fresh-keeping gas provided by the invention has a good effect on the fresh-keeping of the green tea mouthfeel.

The fresh-keeping effect of green tea is mainly judged from its color and taste. If the taste is good and the color is good, its corresponding fresh-keeping effect is good. In summary, the green tea fresh-keeping gas provided by the present invention has a good fresh-keeping effect on green tea. However, the preparation method of the green tea fresh-keeping gas provided by the invention is simple to operate, and the precision of the prepared fresh-keeping gas is high. The preparation device of the green tea fresh-keeping gas provided by the invention has a simple structure, is easy to operate, and can more accurately prepare the green tea fresh-keeping gas.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. a kind of green tea fresh-keeping gas, which is characterized in that including diluent gas and effect gas, effect gas includes dioxy Change carbon, methane and vaporous water, the diluent gas is inert gas, the volume ratio of the diluent gas and effect gas For 9990-9995：5-10, the volume ratio of carbon dioxide, the methane and the vaporous water described in effect gas are 200-300:5-10:10-30。

2. green tea fresh-keeping gas according to claim 1, which is characterized in that the diluent gas is nitrogen.

3. a kind of preparation method of green tea fresh-keeping gas, which is characterized in that for preparing such as claim 1-2 any one of them Green tea fresh-keeping gas, including the diluent gas, the carbon dioxide, the methane and the vaporous water are mixed.

4. preparation method according to claim 3, which is characterized in that by the diluent gas, the carbon dioxide, the first It is by the diluent gas, the carbon dioxide, the methane and the vaporous water that alkane and the vaporous water, which carry out mixing, It is filled with one by one in same vacuum tank, and monitors in the vacuum tank pressure during be filled with to control each component gas Charge.

5. preparation method according to claim 4, which is characterized in that each component gas, which is filled in the vacuum tank, to be made The vacuum tank reaches the intake valve of closing vacuum tank after setup pressure value, and the pipeline that will connect the vacuum tank is taken out very The intake valve is opened after sky again and is passed through the gas of next grouping point.