The coffee bean is inflated and inflated. Can it still be drunk?
The matter is purple, a friend bought a bag of coffee beans offline, unsealed and put them the next day, only to find that this bag of coffee beans suddenly swelled the bag! So he left a message backstage on the front street: "can I still have this bag of coffee beans after bulging the bag?"
(example diagram) normally, there are only two reasons for the sudden swelling of sealed food bags: one is the physical expansion of the bag, which is commonly known as air leakage, and the lack of vacuum in the bag is caused by problems such as breakage and loopholes in the bag, so there is a case of bag expansion. One is the bacterial bulging bag, which is about failing to completely kill the possible gas-producing bacteria in the process of food sterilization, resulting in the proliferation of such bacteria in the food after the completion of packaging, and the production of gas, resulting in inflated bags. However, these two factors do not apply to coffee beans, because the coffee beans themselves will exhaust themselves, and the reason for the swelling of the bag may be that this packet of coffee beans is just a collection of these three elements:
First, the baking date is too fresh as we all know, freshly baked beans will have an eye-catching feature: "have a very exuberant gas!" This gas refers to carbon dioxide (CO2).
When we bake coffee, we will produce a very large amount of carbon dioxide, and when the baking is over, half of this carbon dioxide will be hidden in the porous structure inside the coffee beans, and this carbon dioxide will be released gradually over time, especially when it is just baked.
Second, beans are medium-deep baking degrees. Beans with different baking degrees will directly affect the final hidden carbon dioxide content. The main reason is, as we said, the deeper the coffee beans are roasted, the more thoroughly the interior will be "destroyed". As a result, the looser the overall structure, the more carbon dioxide can be produced and accepted, so generally speaking. Deep-baked beans tend to emit more gas than light-baked beans! We can see this intuitively from the steaming link of hand flushing!
Third, the bag does not have an one-way exhaust valve, which is the biggest reason for the expansion of the bag: coffee bean bags do not have an one-way exhaust valve! In "Daba! This hole is not used to squeeze air and smell incense! "in this article, we can know that the purpose of the one-way exhaust valve is to prevent the bag from exploding because it can't hold the gas.
Beans will be cooled immediately after baking, and need to be bagged and stored immediately after cooling, otherwise the flavor will be lost with carbon dioxide! And after bagging, the beans will continue to emit a large amount of gas, at this time, we need an object, so that the gas can be discharged without letting the outside air in, so that the bean bag can avoid the risk of frying the bag, but also allows the flavor to be preserved, and it is an one-way exhaust valve!
But not all bean bags will have an one-way exhaust valve, the seller may want to reduce the air contact of the beans, so that the flavor has a longer retention time and use the bean bag without the exhaust valve! Bean bags without exhaust valves and freshly roasted deep-baked beans will lead to the phenomenon of inflated bags! "but every bag of coffee beans sold on the front street has an exhaust valve, so there should not be a bloated bag. Is it a sample?" With doubt, Qianjie replied to the friend like this. And the friend replied like this: "is it possible that I bought it from someone else?"
Front Street Cafe
No. 10 Baoqian street, Yandun road, Dongshankou, Yuexiu district, Guangzhou, Guangdong province
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