How to keep the coffee beans when you buy them? Guide to the preservation of coffee beans

For professional baristas, please follow the coffee workshop (Wechat official account cafe_style)

"how should I keep the beans when I buy them?" "would you like your coffee beans in the fridge?" "how long will coffee beans last?" Why the beans you sell have been baked for several days. Do you have any more fresh ones? " These questions about coffee beans, Qianjie is asked almost every day, about the preservation of coffee beans, the front street of this article is a guide to the preservation of coffee beans.

Q1: how to judge the freshness of coffee beans?

When we buy a bag of coffee beans, you can look at the baking date on the package (here refers to the baking time of the coffee beans, not the expiration date), and you can see that there is a button-sized one-way exhaust valve on the package. used to release carbon dioxide produced by coffee beans in the package while preventing outside air and moisture from entering the package. Qianjie believes that the freshest state of coffee beans is within 30 days after baking, while the best time for coffee flavor is within 14 days after growing beans.

Q2: what is growing beans? Why raise beans?

Chinese people are particular about freshness in their mouths, and so is coffee. Freshly ground coffee can better reduce the loss of flavor. In addition, freshly roasted coffee is also an important "freshness" of coffee. But there is a word called "things go to the extreme". Coffee beans that have been kept for a long time are not good, and so are those that are too fresh. At this time, we have to raise the beans, that is, quietly wait for the coffee beans to release carbon dioxide in the packaging for a few days.

Bean cultivation is a process of releasing gas / carbon dioxide. Because about 2% of the weight of coffee beans that have just been roasted by fire is carbon dioxide, and this large amount of carbon dioxide emits carbon dioxide with the storage environment, equipment, or method, making the pressure in the package higher than an atmospheric pressure. the pressure helps to integrate the aromatic substances with the oil, making all the aromatic substances inside the coffee beans easy to extract.

In general, the exhaust effect of coffee beans does not begin until 3 hours after baking, and the coffee beans do not release any carbon dioxide, and the taste after brewing is very unstable. If you have ever washed hot water into freshly roasted and ground fresh coffee powder, or use it to make a cup of espresso, you will find it very sharp and irritating in taste, with over-extracted bitterness and obvious acidity. It will be difficult for you to associate it with the smooth and sweet taste.

Q3: can't I just flush without raising beans?

Do not ignore the importance of raising beans, because coffee without good beans is prone to unclean taste. First of all, undernourished coffee beans will have a sense of "dryness". This is the choking smell of smoke left inside the coffee beans after being roasted at high temperature, which takes a period of time to release carbon dioxide to remove, so compared with coffee without beans, coffee that is kept for a few days tastes cleaner and its flavor is highlighted.

Q4: how long does it take to raise coffee beans?

With regard to the time of growing beans, because the roasting methods of coffee shops or coffee brands are not the same, the roasting degree of different coffee beans will be different, and the damage to the structure of coffee beans will be different, so there is no standard answer to the time of growing beans. For freshly roasted coffee beans in Qianjie Coffee, Qianjie recommends 3-4 days for lightly roasted coffee beans and 4-5 days for moderately roasted coffee beans.

Q5: how to save the coffee beans after they are bought home?

① avoid light source, high temperature: the lethality of light source to coffee beans is easy to understand: when coffee beans are exposed to light source, the heat of the light source will accelerate the oxidation of coffee beans, and the aromatic substances in coffee beans will volatilize more quickly. There are too many aromatic substances that can be extracted before brewing, so the coffee is light and tasteless, so it is important to use equipment to block the sun.

Qianjie Coffee recommends using a bag with an one-way valve to hold coffee beans, while the aluminum foil inner layer of the one-way valve bag is equivalent to a sunshade, blocking the light and isolating the high temperature. Or use sealed cans with opaque and good thermal insulation as storage containers. As for coffee shops, transparent sealed cans are used for storage, first, they are used frequently and can be used up quickly, and secondly, for display, so transparent sealed cans of coffee beans are used.

② avoids oxidation: coffee beans are ruthlessly oxidized when exposed to enough oxygen, so a moderate reduction of oxygen can prolong the freshness of coffee beans. But oxygen is ubiquitous, and it rushes into your one-way valve bag within 3 seconds of opening it, so it's hard to block the air. So after weighing the coffee beans, you need to seal the remaining coffee beans as soon as possible to reduce oxidation.

③ avoid contact with water: specifically, the moisture in the air, coffee beans exposed to wet environment will be more likely to deteriorate than beans in dry environment, resulting in defects such as mildew and other defects, but also accelerate the loss of coffee flavor, so sealed as soon as possible after use is the best protection.

Q6: do coffee beans need to be kept in the refrigerator?

Never keep it in the refrigerator. The wood fiber structure of coffee beans is easy to absorb the taste of the refrigerator; secondly, when the coffee beans are taken out in the refrigerator, the temperature of the beans is different from the external temperature, which is easy to produce moisture, which is very easy to make the coffee beans damp. Qianjie recommends that coffee beans should be kept away from light, high temperature and dry places at room temperature.

For more boutique coffee beans, please add private Qianjie coffee on Wechat. WeChat account: kaixinguoguo0925