Why do coffee shops emphasize freshly ground coffee?
If the diameter of the coffee powder is doubled, the volume of a single particle is reduced by 1 × 8, and the surface area of the corresponding total coffee powder is doubled. After the coffee bean is ground into coffee powder, its surface area increases exponentially, and the area of contact with air increases hundreds of times.
Once the extremely important acidic and volatile fats in roasted coffee beans come into contact with the air, the chemistry will change and the taste will become worse. The esters and aldehydes in the aromatization table of coffee are the most volatile, and the volatilization will make the coffee taste worse.
Not only is the volatile loss of aromatic substances, the oxygen in the air will also oxidize aromatic components, especially the oxidation of fat, resulting in the smell of decay. Freshly ground coffee powder quickly absorbs moisture from the air, increases weight and reduces the effectiveness of extracting coffee ingredients, complicating matters under internal molecular pressure.
Therefore, coffee powder bought in the store for a long time can only be used as "mummy fragments" of coffee, because the flavor of coffee powder loses a lot. In order to make a good cup of coffee, you must not buy coffee powder conveniently. It is the best way to use it now.
In addition, even when roasting coffee beans, the aroma of coffee is very easy to give off. Coffee beans that are well preserved for more than a week or two after roasting are not fresh, so not only should they be ground freshly, but also choose freshly roasted coffee beans that are well preserved as far as possible.
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I'll tell you a good way to preserve coffee. Coffee basics.
Many people have a misconception that storing coffee in the refrigerator is the best way to preserve it. In fact, it is reasonable. But please think about it carefully. Every time you take the coffee out of the refrigerator and put it back after use, during the process of getting out and entering the refrigerator, the coffee will be affected by different hot and cold temperatures, which may have been a good protection.
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Infinite World of Coffee beans Highland Coffee is superior
Coffee beans would rather have the kind of Chen Sheng and Wu Guang who rose up thousands of years ago and shouted: how dare the princes? Of course, it sounds very pleasant to us, who have long been used to the idea of equality for all, but if this sentence is put on the coffee beans, it is estimated that the beans will jump out and object: we all have to talk about our origins! In our opinion, they are all coffee like small black charcoal.
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