Common sense of espresso caffeine content in a cup of Espresso

In addition to its unparalleled aroma, consistency and rhyme, Espresso coffee has one of its biggest characteristics: it is very low in caffeine. The first time some people drink Esprsso coffee, they get the illusion that coffee that strong and pure must be high in caffeine. On the contrary, of all the known methods of making coffee, the Espresso machine makes coffee with the least caffeine in it, using the same coffee beans. Because the caffeine in coffee is a water-soluble substance, the longer the coffee powder is in contact with water, the more caffeine dissolves, and the Espresso coffee brewing time is only more than 20 seconds, when the caffeine is not released in time, a cup of fragrant coffee has been cooked, so the caffeine content is only 1/3-1/2 of the general other brewing methods.