Do you want to keep the coffee beans in the refrigerator? The principle of cryopreservation of coffee beans how to store fresh coffee beans

"Qianjie recently noticed a topic in the exchange group."

"how did you keep the coffee beans after you bought them back?"

"put it in the fridge! I see a lot of coffee bosses put beans in the fridge. "

"but won't you get wet if you put beans in the fridge?"

"keep it dry in the refrigerator!"

(so Qianjie interviewed the major coffee beans 🎤)

First of all, we need to understand why frozen coffee beans?

What is the purpose of freezing coffee beans?

Frozen coffee beans are designed to keep them fresh. What needs to be frozen and fresh is often the freezing treatment made by merchants after baking in large quantities in order to ensure the freshness of coffee beans. Freezing treatment can greatly reduce the rate of oxidation and metabolism of coffee beans, and can effectively "lock" flavor substances in coffee beans. According to research, coffee beans in a frozen state, coffee flavor can be maintained in 2-3 months to maintain a good state. Although freezing can maintain the flavor of the coffee, the beans are in a "pseudo-fresh" state, and even if the flavor is close, it is certainly not as good as the flavor after freshly roasted for a few days.

(schematic diagram)

The front street often emphasizes the freshness of coffee beans. Freshly roasted coffee beans are the best taste period for coffee beans 4-30 days after baking. Why 4 days after baking? The freshly roasted coffee beans produce a large amount of carbon dioxide, and the smoke produced during the baking process makes the coffee beans smell like smoke after baking.

During these four days, coffee beans will release carbon dioxide by themselves through an one-way exhaust valve, and the carbon dioxide will be released with the smell of smoke. this period of time is what we often call the bean cultivation period. Of course, with the degree of baking, baking ideas are different, the time of coffee beans are different, 4 days belong to the "bottom" time.

So what do coffee bosses freeze coffee beans for?

Improve the grinding quality of coffee beans and make the particles of coffee beans more uniform after grinding. Frozen coffee beans become more crisp, and the oil in coffee beans is also in a state of condensation. When grinding, coffee bean particles will be more uniform, reducing the production of coarse / fine particles.

(attention! This is in a frozen state, take it out and grind it immediately. The surface of thawed coffee beans will produce moisture because of the temperature difference, which will not only affect the grinding, but also affect the flavor performance of the coffee. And in the process of brewing, the water temperature also needs to be adjusted, because the temperature of the coffee powder is lower than the room temperature.

So can we also make the coffee particles more uniform in this way when we brew it every day? Qianjie does not think it is necessary. First of all, this frozen grinding requires a very fast operation. Due to the large temperature difference, in many cases frozen beans begin to produce moisture in less than 1 minute after returning to room temperature.

Secondly, the hardware is also an important link, if coffee beans are found to be very uneven after grinding, it is recommended to replace a coffee bean grinder of better quality. If there is only too much fine powder, it is recommended to buy a fine powder sieve to dry off the fine powder.

What conditions do you need for frozen coffee beans?

Frozen coffee beans are not as simple as people think. You can't just put them in the refrigerator. After roasting, the coffee beans are packed in separate bags and the gas is removed from the package and sealed, leaving the coffee beans in a vacuum and frozen in a refrigerator of-18 ℃ ~-21 ℃. Once the frozen coffee beans are thawed, they cannot be frozen for a second time.

(schematic diagram)

In front of the street, I heard that many enthusiasts like to put the original package in the refrigerator. If the coffee beans after opening are not sealed, the "colorful" smell in the refrigerator will like to run into the coffee bags. Coffee beans are in a state of "no rejection" and are completely absorbed. After such beans are ground and boiled, the taste can make you doubt life!

How to preserve coffee beans every day?

First of all, when buying coffee beans, try not to hoard beans, drink a pack and then buy a pack. When preserving coffee beans, choose a cool and dry place. High temperature will speed up the dissipation of bean flavor. The way of preservation can be preserved in the original package. Coffee beans sold on the front street will have an one-way exhaust valve, which can release the gas in the package and block the entry of external gas at the same time. But remember to pull up the sealing strip oh ~ conditional partners can also buy vacuum sealed cans for coffee beans storage.