Does tea need to be refrigerated in cold storage to keep it fresh, and how to store tea refrigerated

Tea cold storage belongs to the fresh-keeping warehouse: the storage temperature is generally 0 5; The tea is stored in a temperature of 5 degrees Celsius.

The following is the use of cold storage.

To preserve tea, pay attention to the use of this method: if the storage period is less than six months, refrigerate the temperature.

degrees to maintain 0 5 degrees Celsius is the most economical and effective; If the storage period is more than half a year, it is better to freeze (-10 to -18 degrees Celsius). It is best to store in a dedicated refrigerator, if it must be refrigerated with other foods, the tea should be properly stored.

Wrap. Tea cold storage can generally use imported compressors, such as Copeland in the United States, Bitzer in Germany, etc. Air cooler in the warehouse.

It can use the more famous refrigeration fan in China. Some customers may feel that the early cost of choosing this is more expensive, and then choose some relatively low refrigeration units, in fact, choose a cheaper unit, its quality is not necessarily good, later maintenance, or frequent damage may lead to the refrigeration effect in the cold storage, resulting in the quality of the internal tea.

If you drink tea at home, the amount is small, and you can basically drink it in a month or two, so there is no need to put it in the refrigerator.

In addition, there are too many miscellaneous items in the refrigerator at home, and there are too many miscellaneous smells, and the tea is easy to absorb flavor, so if it is not well sealed, it is counterproductive to put it in the refrigerator.

The purchased tea leaves are sealed and then wrapped in several layers of plastic wrap, and after being completely sealed, they can be stored in the refrigerator, and when they are drunk, they can be taken out like the newly bought. But it is limited to green tea and Tieguanyin, etc. Jasmine tea, black tea and Da Hong Pao tea do not need to be placed in the freezer, as long as they are stored at room temperature, away from light, and sealed.

(1) Lime dehumidification and storage method.

The preservation method of using lime dehumidification to store special green tea is one of the commonly used tea preservation methods in China, especially in the storage process of West Lake Longjing. The method is to hand fry the tea after the pot is dried, the tea leaves that have just been fried and cooled are put into the lime tank of the tea storage warehouse, the cylinder is porcelain, the size is determined according to the production volume, the lime is lumpy lime, and the lime is equipped with the amount of lime according to the weight of 1 5 of the tea leaves. The lumpy lime is placed at the bottom, and the tea leaves are wrapped in cloth bags or kraft paper and placed on the top, and the cylinder mouth is sealed.

Regularly check the condition of the lime block, and replace it if the lime has melted into small lumps. Perennial storage, generally 3 5 times a year. It creates a good "post-ripening" environment for tea, which is not found in other tea productions.

First, the moisture absorption ability of block lime can not only absorb part of the water in the tea body, but also remove the water vapor in the storage environment, forming a very dry storage environment. The second is that the lime will release a slight heat after absorbing moisture, and a temperature close to the body temperature (about 40) is a favorable temperature for the formation of quality. Third, a large number of tea leaves are gathered in a tiny environment, and the high concentration of aroma in the environment is conducive to more consistent quality.

At present, some manufacturers or business units use color-changing silica gel instead of lime, and its preservation principle is consistent with quicklime, and its advantage is that when the color-changing silica gel adsorbs high moisture, it can be taken out to dry or dried and reused, which can reduce replacement and pollution.

2) Low temperature storage and preservation method.

The low-temperature storage and preservation method is usually achieved by using a refrigeration unit to reduce the temperature of the storage container and place to low temperature. Using this method, the special green tea can maintain excellent quality for a long time and has a good preservation effect. As long as the packaging materials with good sealing are used, the quality is basically unchanged when stored below 5 for 8 to 12 months; Stored below 18 years, it can be maintained for 2 to 3 years, and the quality is basically unchanged.

3) Deoxygenation storage and preservation method.

In addition to the oxygen in the tea storage environment, the effect of storage and preservation is very obvious, and the commonly used ones are pumping nitrogen packaging, vacuum packaging and deoxygenation packaging.

Pumping nitrogen packaging is a method of replacing oxygen by filling with gases that have little impact on the tea storage process, such as carbon dioxide or nitrogen, to replace oxygen.

Vacuum packaging is a method that uses a vacuum packaging machine to extract the air in the bag and seal it immediately to form a vacuum state in the packaging bag, thereby preventing the oxidation of oxygen on the tea.

Whether it is pumped nitrogen packaging or vacuum packaging, the packaging container selected must be made of aluminum foil or other composite film materials with good oxygen resistance, or iron and aluminum cans.

Deoxidation packaging refers to the use of composite film materials with good air tightness to fill tea leaves, add a small package of deoxidizer, and then seal. Oxygen absorbers are specially treated activated iron oxides that react with oxygen in packaging containers, thereby consuming the oxygen inside packaging containers. The results showed that the special green tea with deoxidized packaging was slightly better than the nitrogen-filled packaging in terms of aroma and taste, so it was more widely used.

Green tea is refrigerated at 4-6 degrees Celsius for freshness, oolong tea is frozen at minus 20 degrees after small bubbles, black tea can be sealed and preserved, and yellow tea bricks are kept: ventilated, dry and odorless. Yellow buds are refrigerated at 4-6 degrees, and fully fermented teas such as:

Black tea, pu'er, etc. do not need to be put in the refrigerator, because it must constantly oxidize with the air naturally, and maintain ventilated, dry, and odorless storage conditions.

Need. If the storage period is less than six months, it is most economical and effective to maintain the refrigeration temperature at 0 5 degrees Celsius; If the storage period is more than half a year, it is better to freeze (-10 to -18 degrees Celsius).

It is best to store in a dedicated refrigerated (frozen) warehouse, and if it must be refrigerated with other foods, the tea should be properly packed and completely sealed to avoid absorbing odors.

When buying a large amount of tea at a time, it should be divided into small packets (cans) first, and then put into the refrigerated (frozen) warehouse, and the required brewing amount should be taken out each time, and the same bag of tea should not be frozen and thawed repeatedly.

When taking out the tea leaves in the refrigerated (frozen) warehouse, the temperature of the tea leaves in the tea can be raised to a similar room temperature before the tea leaves can be taken out.

Tea leaves need to be cooled and stored1. Before the tea is put into the refrigerator, it is necessary to ensure that the shed bridge hole is completely sealed to prevent the tea from becoming the "deodorant" of the refrigerator.

2. If the drinking rate is high, the tea should be put in the refrigerator, and the temperature of the refrigerator should be adjusted to about 5 degrees Celsius; However, if the tea leaves are unopened and want to be stored for more than a year, they should be placed in the freezer.

3. The correct way to take out the tea leaves from the refrigerator is to put the tea leaves at room temperature to rise, and then brew and drink them after they rise to room temperature.

4. Green tea needs to be stored in the refrigerator, while the content of polyphenol chain dry substances in oolong tea and black tea is relatively low, the aging and deterioration rate is slow, and it is easy to store; As long as the flower tea is placed in a dry, airtight, light-free and odor-free container, it can be stored for a long time.

The tea froze.

In terms of fragrance preservation, -70 ultra-low temperature freezing effect is significant; According to experts, freezing tea can stop the oxidation rate of tea leaves. The aroma, taste, and color of tea are all longer than ordinary preservation methods.

Whether refrigerated or frozen, the optimal moisture content of these stored teas should be between 4%-5% and stored tightly sealed. Compared to green tea, traditional oolong tea, black tea, jasmine tea, white tea, black tea, and pu-erh tea can be kept without the refrigerator.

Traditional oolong tea and black tea are easy to preserve because of their low content of polyphenols and slow aging and deterioration. However, flower tea has a strong floral aroma, and low temperature preservation will inhibit its aroma and reduce its concentration. White tea, black tea, and Pu'er tea taste better when left alone.

Therefore, they do not have to be refrigerated.

When buying large quantities of tea at a time, it should be packed in small bags (cans) and then placed in a refrigerated (frozen) room. Take out the desired brew volume each time. The same bag of tea should not be frozen and thawed repeatedly.

Generally, green tea and yellow tea are sealed in half a catty, and fragrant oolong tea is sealed in one catty. Its advantages are: first, it is conducive to rapid freezing and avoids.

Tea refrigeration and freezing both belong to tea preservation, some tea is suitable for refrigeration and preservation, and some tea is suitable for freezing preservation.

Storage requirements for different varieties of tea in cold storage:

Green tea (Biluochun, Longjing).It can be placed in cold storage, the temperature is controlled at 0-8, and the relative humidity is controlled below 65%, and the tea can be kept fresh for 7-10 months under this condition;

Oolong tea, TieguanyinIt can be placed in the freezer, the temperature is controlled at -15, the relative humidity is controlled below 65%, and the tea can be kept fresh for 7-10 months under this condition;

Because tea is greatly affected by humidity, the relative humidity of the cold storage should be strictly controlled when stored in the cold storage. In the environment of high humidity, the activity of enzymes in the tea will increase, resulting in differential yellowing and deterioration. Therefore, the humidity should not be too high and should be controlled within an appropriate range.

When the tea is stored in the cold storage, the cold storage management should be carried out in strict accordance with the requirements of tea storage, and the freshness of the tea should be checked regularly during the storage period.

Tea storage is refrigerated.

For tea leaves that can be stored in the refrigerator, it is only suitable for refrigeration and not for freezing, so it is best to store the tea leaves in the refrigerator. Because the freezing temperature is too low, the water in the tea leaves will be drained quickly. If the tea leaves are too dry, they are easy to break; If they are bad, the taste will change, and so will the taste of the tea leaves.

After the refrigerated tea leaves are taken out of the refrigerator, they should be sealed and stored in time after use, otherwise the tea leaves are easy to condense the moisture in the air, thereby increasing the water content of the tea and accelerating the deterioration of the tea.

Tea leaves such as black tea, pu-erh tea, and flower tea do not need to be stored in the refrigerator. Because black tea is a fermented tea, the tea contains less tea polyphenols and is easy to preserve. Flower tea has a strong floral aroma, and storage at low temperature conditions will inhibit its fragrance, reduce the freshness and concentration of the aroma, Pu'er tea is a post-fermented tea, containing beneficial bacteria.

Precautions for refrigeration of tea leaves

It is better to store the tea in the refrigerator at a temperature of around 10 degrees. If it is kept at about 0 to 5 degrees, the storage effect will be better. Tea has strong hygroscopicity and flavor absorption, tea is stored in the refrigerator, be sure to pay attention to the tightness of the tea and the smell in the refrigerator.

In addition, the tea should be stored in the refrigerator and not put together with items with peculiar smells to avoid peculiar smells.

When storing tea leaves in the refrigerator, be sure not to put them together with other items with peculiar smells to prevent odor channeling. At the same time, when the tea leaves are taken out of the refrigerator freezer, the temperature of the tea leaves in the tea can should be raised to room temperature before opening and taking out, otherwise the low-temperature tea leaves are easy to condense the moisture in the air, thereby increasing its water content and accelerating the qualitative change.