Why is my coffee stale? Coffee beans storage and preservation advice

There have been a few times when you opened the bag of coffee beans, but it didn't smell so good; after it was cooked, it didn't taste so good. But this will not happen in the coffee beans sent to you by the front street coffee, because the coffee beans of the front street coffee are all baked on the order, and after you get it, it is only too fragrant and has no light taste during the appreciation period. But fresh baking is not what we want to talk about today. Today, we will mainly talk about how to preserve coffee beans so that they can remain strong, mellow and fragrant.

What are the factors that cause the coffee beans to lose their flavor?

For each of the following reasons why coffee is not delicious, let Qianjie Coffee explain it to you one by one!

1. The aroma of coffee will slowly evaporate.

Most of the aroma of coffee beans is produced after roasting, while the aroma and carbon dioxide will evaporate over time, basically within a few days after roasting, and then slowly disappear over time. Most coffee sellers or e-merchants will put coffee beans in bags with one-way exhaust valves to keep the fragrance from escaping. You can also put the coffee beans in an airtight jar and open the jar only when you want to drink it.

Picture (one-way exhaust valve, air only goes out and does not enter)

Do not grind the beans into powder in advance, so that the fragrance will spread more quickly and will increase other factors that become unfragrant, such as oxidation.

Qianjie coffee is really recommended to be ground when you drink it. If you have reasons or hobbies that have to be ground, please "seal" them separately and freeze them in small bags. Don't let the moisture or the smell of the refrigerator run in. Use one bag again when you want to drink it, and use it as soon as possible! To prevent the cooling moisture from affecting the quality of the coffee.

There are still different opinions about whether coffee can be frozen, but according to the editor's own experiment, it is also a good method in terms of convenience.

two。 Temperature destroys the flavor of coffee

Temperature accelerates many chemical reactions that spoil coffee beans, but that doesn't mean you need to refrigerate or freeze coffee beans, just keep them at room temperature. But remember not to put it in a place that is too hot, such as where the kitchen is often hot, near the computer room, or near the heater.

If you insist on a temperature, the Qianjie Coffee Club advises you not to exceed 25 degrees Celsius as far as possible.

3. Direct sunlight will destroy you, dear Doudou.

If your coffee bean is in a glass bottle or other transparent container, please don't let it be exposed to the sun directly. The temperature and ultraviolet rays brought by the sun will affect the coffee beans. Even if your coffee beans are in an opaque bag or jar, you should avoid being exposed to the sun directly. This principle applies to most foods.

4. Avoid coffee beans coming into contact with air

When the fatty acids in the natural oils of coffee beans come into contact with oxygen, they eventually become short-chain fatty acids, which is the source of oil odor. If you don't want the coffee to become "smelly", be sure to avoid exposure to oxygen. Take out the beans only when you want to drink them, and seal them.

5. The choice between growing beans and being fresh

Judging from the above points, it is the most delicious to drink all the coffee beans as soon as you get them.

No, it's not like that.

Usually, even if the baked beans are put in a closed bag, it does not mean that it is static all the time. It will continue to emit carbon dioxide and a lot of aromatic gases. In the initial stage, the aroma increases more and disappears less; after two weeks of baking, the increase of aroma slows down, but the disappearance of aroma persists. So the most delicious period of coffee beans occurs about a week to three weeks after baking. This is the best tasting period. However, the characteristics and roasting degree of each kind of coffee beans are different, and the best taste period will be more or less different.

But seriously, the best taste period does not represent the real shelf life of coffee beans. It is generally believed that unopened coffee beans can be preserved for between three months and half a year, but different countries have different views on this matter. For example, South Korea thinks that coffee beans can be preserved for a year, while Germany treats them with very strict standards. Anyway, the most important thing is to drink it as soon as possible!

Finally, I would like to summarize the suggestions for the preservation of coffee beans.

How to do the best way to preserve coffee beans?

1. Seal off the oxygen.

If coffee beans are in constant contact with oxygen, they will continue to oxidize, just like other foods.

two。 Keep at room temperature or lower.

When the temperature is low, the oxidation will be slower.

3. Don't bask in the sun.

This is why most coffee bean packaging, in fact, will deliberately prevent the light from entering!

4. The best taste period is between 1 and 3 weeks after baking.

After all, coffee beans are still in favor of fresh food, and it is best to brew them as soon as possible after raising the beans.