The relationship between coffee extraction and grinding degree-what is the change in taste and flavor of coffee with different grinding degree?

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How to judge and set the grinding degree of espresso

Extraction speed: the speed of oxidation is proportional to the surface area, and the extraction of substances in coffee is also proportional to the surface area, that is to say, the finer the grinding, the faster the extraction speed and the more the taste of extraction.

Coffee extraction

What the extraction pays attention to is how to extract just right, can dissolve the good taste, and can hit the brake before the bad smell comes out, which is the most ideal goal. Therefore, if today's coffee beans are ground, the size of the particles varies greatly, the extraction speed of each coffee powder will be different, and the extracted taste will be in a mess.

Simply imagine that if the size of the particles is uneven, we should roughly divide them into large, medium, small and medium-sized ones (in fact, there are more than ten or twenty sizes). When the coffee powder comes into contact with water, a tragedy occurs:

Coffee grinding and extraction

Suppose that the coffee powder in the particles just reaches the extraction equilibrium point, the good taste has been extracted, and the bad taste has not come out yet: the perfect extraction.

Large particles of coffee powder dissolve slowly, at this time the extraction is not finished, the good taste has not come out, we call it: insufficient extraction.

Small particles of coffee powder dissolve fast, have long been extracted, and began to release a crazy bad taste, we call it: over-extraction.

From the above, it can be seen that this cup of coffee brewed under uneven grinding is the sum of the insufficient taste of 1x3 extraction, astringent and complex over-extraction of 1ax 3, and perfect extraction of 1amp 3. The result is extremely bad, and it is another demonstration of throwing good coffee beans into the water.

However, if the grinding particle size is more average and the overall coffee powder size drop is smaller, the above tragedies can be avoided, and the most appropriate coffee substance can be dissolved at the same extraction speed, which will move you to tears.

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