How long can the coffee be ground and preserved? How to make coffee powder taste better?

We know that the flavor of pre-ground coffee powder is not as good as freshly brewed coffee. This is because the coffee beans will accelerate the loss of flavor after grinding, resulting in the coffee flavor from the pre-ground coffee powder is not so rich.

Everyone knows the truth, but sometimes it is the last stubbornness of coffee people to grind the coffee beans into powder when the conditions do not permit. Therefore, how long the flavor of coffee can be preserved after grinding has become a concern of many friends! In this regard, Qianjie began to prepare this experiment a month ago. Qianjie sealed and encapsulated the ground coffee powder on December 31 last year, January 9 and January 16 this year, and brewed it today (January 29). The grinding time corresponds to 30 days, 21 days and 14 days.

"there is one thing to note here: the taste period (flavor period) of coffee should not only look at the baking date, but also pay attention to the storage environment. For example, for the same type of coffee beans, one bag is opened 2-3 times a day, and the other has not been opened, so after 30 days, the flavor of the two bags of coffee beans will be better than the one that has not been opened frequently. Coffee powder is more sensitive, where the front street is sealed and sealed immediately after being ground into coffee powder, which is not opened during the period. "Qianjie will come in to squeeze out the air and seal it again when it is encapsulated, and it can be seen from the packaging of the bag that the bag with a longer period of time will bulge a little bit.

It's not too late, make it right away! These three packets of coffee powder are all rosy summers in the Pokuit region of Panama. The first brew was ground on January 16 (14 days). When you open the package, you can smell the aroma of flowers and fruit. When steaming, the coffee burger bulges easily, proving that the coffee powder is still relatively fresh. After the second and third stage of water injection, the foam on the liquid surface behaves normally. The extraction time is 2 minutes and 10 seconds, which is not much different from the usual brewing scene.

In terms of flavor, you can taste citrus juice, honey and a hint of flowers. After being pre-ground into coffee powder and sealed for 14 days, the flavor of the coffee is still very obvious. Then brewed coffee powder (21 days) ground on January 9. Tearing open the package, it still exudes the smell of flowers and fruit. When steaming, the coffee powder has the phenomenon of water absorption and bulging, but the expansion range is small, and the coffee powder is still fresh. After the second and third stage of water injection, the foam on the coffee surface is relatively thin. However, there is no obvious abnormality in the overall brewing process. The extraction time is 2 minutes and 20 seconds.

On the flavor performance, we can still taste the flavor of flowers, sweet and sour citrus juice, honey rhyme and so on. After 21 days of sealed storage, although the flavor is not so rich, you can still drink the rose flavor (aroma) from the coffee. The last brew is the (30-day) coffee powder ground on December 31 last year. When you tear open the package, you can still smell the fragrant flowers and fruits of Rosa coffee powder. When steaming, the coffee powder does not have any expansion reaction, and the hot water quickly passes through the gap between the coffee powder, leaving obvious pores. This shows that the gas in the coffee powder has been exhausted and is not very fresh.

After the water injection in the second stage, it can be seen that the coffee foam is very sparse, most of the coffee powder is deposited at the bottom, and the powder wall cannot be built. After the third stage of water injection, there is almost no foam on the coffee surface. The speed of launching is slow, and the time after all the coffee liquid is filtered is 2 minutes and 40 seconds. When tasting, the flavor (aroma) is almost gone. And the taste still retains the sweet fruit and honey rhyme like Rose Summer. In the taste, the astringent feeling is more obvious, the rough feeling. (this is because during the extraction, the missing powder wall causes the water in the upper layer to slip away from the edge of the filter cup, and the thick and thin powder layer at the bottom blocks the water in the lower layer. The reason why Qianjie uses rose summer for demonstration is that the cooking process reflected by the fresh and stale state of this bean is very obvious. In this way, it is more intuitive to see how long the flavor of coffee can be preserved after it is ground. In the case of sealed preservation and few times of opening at the same time, the coffee can still drink obvious coffee flavor about 3 weeks after grinding. After grinding into powder for a month, the flavor is almost gone, leaving only the taste of coffee. Similarly, for pre-ground coffee with independent packaging, such as hanging-ear coffee, the best flavor period is about 3 weeks. If the coffee beans are pre-ground into coffee powder, each time you open the package, it speeds up the dissipation of the flavor. Therefore, Qianjie suggests that when you take it home, use several sealed cans (bags) to separate and seal the coffee powder, so that when you open one of the cans, you will not be afraid of the other coffee powder being "stale".