Is frozen coffee really good? Can I put the bagged coffee in the fridge? Can coffee be refrigerated?

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From planting to brewing, people continue to improve the technological level of coffee production and production, and strive to improve the quality of coffee. But perhaps we have all overlooked the simplest step, which is the storage of coffee and ripe beans. Not long ago, experts found that freezing coffee before grinding can improve the quality of coffee.

Maxwell Colonna-Dashwood and Christopher Hendon from the UK have found that the temperature of coffee beans will greatly affect the effect of grinding. They confirmed that freezing the coffee beans and lowering the temperature of the beans can make the coffee more evenly ground, which in turn makes the coffee more delicious. "the particle size and uniformity of coffee powder greatly affect the extraction rate." Hendon said. Colonna-Dashwood added: "in the future, our research results will certainly affect all kinds of coffee competitions around the world."

As the extraction is more uniform, not only the taste of coffee will become better, but also the amount of coffee powder and time needed to make coffee will be greatly saved. "the whole coffee industry will change dramatically as a result." "our method allows more people to taste better quality coffee," Hendon said.

So, to what extent do coffee beans need to be frozen before grinding? The answer is: the temperature should be as low as possible. In the study, two experts conducted three groups of control experiments, using refrigerators (- 19 ℃), dry ice (- 79 ℃) and liquid nitrogen (- 196 ℃). The performance of coffee in the three groups was better than that of normal temperature coffee beans, but the one with the lowest temperature performed the best. The two men wrote in the conclusion: "the uniformity of particle distribution is inversely related to temperature."

Pay attention to when freezing coffee beans:

Freezing is not cold storage, that is, coffee beans should be placed on frozen ice and frozen meat, not on the refrigerated layer of preservation. Because the fresh-keeping environment is low, but the humidity is too high, which is not conducive to the preservation of beans, the frozen area has a lower temperature and very low humidity. By the way, also correct a misunderstanding, freezing is very dry, will not be wet.

Do not freeze immediately in order to maintain high freshness. It should be frozen when the beans are finished and when you think it is the best flavor. The water content of ripe beans is very low, so it will not freeze and can be used directly after being taken out.

After taking out the quantity that needs to be made, it should be frozen as soon as possible to avoid condensation on the surface of the remaining beans because of the temperature difference. Of course, there is no need to put it back in a hurry, the shell of the sealed jar can still be kept warm for a few minutes, which is enough time to take out the amount needed and weigh it. In addition, the frozen environment should be as clean as possible to avoid smelling, or if the container is sealed enough, this problem will not exist.

Okay, now who can tell me where I can get liquid nitrogen?

Thank you for reading.