Coffee extraction methods that beginners must understand Coffee extraction principles

Coffee extraction is a process of extracting substances from coffee powder by dissolving water through coffee powder, and it is also a scientific principle that can be tested. When the water comes into contact with the coffee powder, most of the water-soluble substances are taken out and fused with each other, and then the various coffee flavors, whether perfect or not, are extracted, and finally a cup of coffee is brewed.

Generally speaking, coffee extraction is the first to release the aroma and acidity of coffee, which is why as soon as the water passes through the coffee powder layer, the air is filled with coffee aroma, and the sweetness and bitterness will only be brought out in the middle and after. however, if excessive extraction (beyond the time after extraction), it will have too much bitterness and astringency, resulting in the final flavor of coffee is too thick and hollow, in addition. Coffee particles made from ground coffee beans are more likely to be over-extracted if they are too fine (because coffee particles are quickly extracted and will become soaked if the water has not penetrated). On the other hand, if the coffee particles are too thick, it is easy to underextract (because the water is already fully permeated when it is not in full contact with the water). Therefore, according to different brewing methods, match with the appropriate coffee powder thickness and various parameters. in order to interpret the coffee extraction perfectly.

Coffee extraction mode

Pressure method

By the action of pressure, the water is sent to the loading area of coffee powder and can be drunk after the extraction is completed.

Extraction tools: Italian coffee machine, mocha pot

Immersion method

In a simple way like making tea, stir the coffee powder and water evenly, soak it, and then drink it after the extraction has been filtered.

Extraction tool: French filter kettle

Vacuum filtration method

Use the lower pot to heat the hot water to generate pressure, then push the water to the top pot where the coffee powder has been placed, and then drink the coffee when the extracted coffee is lowered to the lower pot.

Extraction tool: siphon kettle

Trickling filter method

The coffee powder is made by injecting water, and then the extraction is completed by the physical principle of "steaming, dissolving and adjusting the proportion" between water and coffee powder.

Extraction tools: hand coffee, American coffee machine, ice drop coffee

Boiling method

Cook coffee powder, water and sugar together, stir after foaming, and repeat the above heating steps twice to complete the extraction.

Extraction tool: Turkish coffee pot