Factors that destroy the delicacy of coffee how to preserve coffee beans or coffee powder how long is the shelf life of bagged coffee

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The most scientific guide for the purchase and preservation of coffee beans, see here! Guidelines for the preservation of coffee beans

Can coffee beans and coffee powder be refrigerated or frozen in the refrigerator?

Frozen coffee beans and coffee powder will attract moisture, which will freeze on the surface of the beans. at the same time, there are many pores in the roasted coffee beans, and freezing will seal off the water, thus terminating the natural chemical reaction of the beans. Therefore, the flavor of thawed coffee beans or coffee powder is much better than that at room temperature.

What about refrigeration? And you can't! The circulating moisture in the refrigerator is the biggest natural enemy of coffee beans or powder, and the freezer is full of odors, unless you want to do scientific experiments to see how long it takes to destroy a bag of good coffee beans. By the way, after grinding stale coffee beans into powder, it can be a very effective dehumidifier and deodorant.

The biggest enemies of coffee beans are oxygen, moisture, light and heat.

Coffee beans that have not been opened should be kept in a dry and cool place.

After opening, it should be put into an opaque and airtight ceramic container immediately. If it has the function of pumping into a vacuum, it is better to put it in a dry and cool place.

Do not use plastic or metal containers to prevent coffee beans or powder from inhaling the smell of plastic or metal.

If the container is transparent, be sure to put it in a storage cabinet where there is no light.

The ground coffee powder can only be preserved for a few days without losing its taste, so it needs to be packed in an opaque and airtight container.

Under proper storage conditions, raw coffee beans can be stored for several years, but after baking, the life is greatly shortened, and the deeper the baking degree is, the easier it is to oxidize. This is a natural phenomenon, no matter how good the packaging and storage conditions are. At best, it can only delay the rate of decay. Therefore, if you really want a good cup of coffee, it is recommended that you buy only the amount you can drink within two weeks to a month from the baking date according to your dosage.

Although coffee beans are different from ordinary foods, they still have the best time limit for taste.

Coffee during the appreciation period usually preserves the most delicious and charming parts, so that the money you spend on coffee beans can be fully utilized.

Therefore, proper preservation of coffee beans can avoid the helplessness of spending a lot of money but not getting good coffee.

On the basis of personal cognition, the following lists the causes, principles and methods of destroying the taste of coffee:

[oxidation]

Principle: avoid air (oxygen) contact with coffee beans.

Method: use sealed cans. All kinds of sealed cans can be seen on the market, and some can even draw air out of the cans and buy them according to everyone's preference or economic capacity. if you feel that the sealing effect of the sealing cans currently used is not good, you can use different sizes of sealed cans or sealed bags for multi-layer packaging at the same time.

Illy, a well-known Italian bean merchant, is labeled as "nitrogen packed", mainly to prevent coffee from coming into contact with the air and slow down the natural decline of coffee. In addition, the one-way exhaust valve bag is also a very good tool, and many coffee roasters at home and abroad will use it for packaging. The characteristic of the "one-way exhaust valve" is to let the gas in the bag (carbon dioxide emitted by coffee beans) out of the bag, and the air can not enter the bag. This packaging method can effectively prevent oxidation problems, but the one-way exhaust valve bag has other functions, as described later.

[volatilization]

Principle: do not let coffee exposure to high temperature so as not to lose aroma too quickly.

Method: store the coffee beans in a cool place that cannot be exposed to the sun. Some people store coffee beans in the refrigerator, which is not the best way to improve volatilization, as explained later.

[hydrolysis]

Principle: do not let coffee come into contact with water or moisture.

Method: store coffee beans in a dry, cool place, such as a well-ventilated corner of the bookcase.

[light damage]

Principle: do not allow coffee to be exposed to light.

Method: use opaque containers for storage, colored containers or DIY packaging outside the container.

[odor]

Principle: do not allow coffee to be exposed in an environment with a strong smell.

Methods: carefully select the container and storage place.

[natural decay (oil production)]

Principle: reduce the storage time of coffee.

Method: recognize your ability to consume coffee, buy only two weeks of coffee at a time, and avoid buying a lot of coffee at a time.

When will you ice the fridge? ]

Most people will think that the refrigerator is a better storage environment, but it is not! There are fish, fruits and vegetables in the fridge. Although low temperature can slow down the natural decline of coffee, as long as the temperature difference is taken out of the refrigerator, there will be water vapor condensation on the surface of coffee, which is not a good move.

I usually advise friends to store coffee indoors for no more than a month. It is best to finish the coffee within two weeks, but there is really no way to keep it in the refrigerator. If this is really the case, do not rush to throw all the coffee into the refrigerator. Please carry out the action of "sub-packing" first, otherwise the coffee beans will be turned on and off every day, and the coffee beans will be exposed to moisture all the time, so leave the dosage for about two weeks or a month, and the rest will be frozen into the refrigerator, and once the ice goes in, don't take it out casually to avoid dampness. But wait until the coffee in the storage room is finished before taking it out of the refrigerator. It is a good practice to choose a container with good air tightness or multi-layer seal as far as possible in packaging.

[method of picking beans]

Use "fishing"! Instead of using "inverted"!

Because a large amount of carbon dioxide is produced inside the fresh coffee after baking, the carbon dioxide is discharged from the cells of the coffee and becomes a protective film, which can isolate oxygen and slow down oxidation. Because the proportion of carbon dioxide is higher than the air, in the airtight container, carbon dioxide will deposit at the bottom, while the air will float on the upper layer. If the coffee is taken out by pouring, the CO2 in the jar will be poured out. Increase the oxidation effect in the tank.

[be a smart consumer]

First of all, you need to know the baking date of the beans you buy, which represents its freshness and professionalism. Usually, the beans baked three days ago can be regarded as very fresh. (the current baking and buying is not very good in terms of substance.)

Next, is to understand the packaging used by the store, the use of one-way exhaust valve sealing bag is the best. Because coffee beans are not usually the best when they are roasted, they are more or less tainted with flavors other than the beans themselves, which are added after the baking process, such as the special smell in the baking room (boiler) and the smoke smell of baking (deep-baked beans often appear). Some boilers will cause the baked beans to have the aroma of caramel, which will add points to the evaluation of this packet of coffee beans, but the smell of tobacco is not. The smell of baked tobacco is not good if it enters the inside of the beans. After cooking, it will destroy the aroma of the beans themselves, so it is often heard that people say the term "raise beans", that is, the beans are stored for two days after baking before drinking. Two days ago, it was the most exuberant period for coffee to spit out secondary gasified carbon. The advantage of using an one-way exhaust valve bag is that the air can not touch the coffee, and the gas in the bag can be discharged to remove the smell of smoke.

To sum up, the best way is to find out the amount of coffee you drink. After you buy it, drink it early while it's fresh. It's the best!

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