Will coffee beans wither when stored for a long time? How to preserve coffee beans correctly

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Deterioration (deterioration)

It refers to the change that the performance of the polymer material decreases and cannot be recovered. Due to the action of heat, light, ultraviolet light, oxygen, ozone and various chemicals, polymer materials will change their physical or chemical properties, such as discoloration, cracking, intensity reduction and so on. These external conditions can cause the breakage or cross-linking of the polymer main chain, resulting in structural changes and reduced properties.

Roasted coffee beans will gradually change after a long time, and when they reach a certain point in time, they will become difficult to feel good and eventually become bad. The process in which coffee gradually loses its taste is called the deterioration of coffee beans.

The criterion of deterioration is based on the subjective determination of coffee producers and tasters.

Which tastes better, freshly roasted coffee beans or coffee beans that have been kept for a year? literally, everyone will choose the former, but if they drink blindly, some people will think the latter tastes better. For those who choose the former, the coffee beans deteriorate after a year, but for those who choose the latter, this period is the so-called bean cultivation period.

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Why does the flavor of roasted coffee beans change gradually?

It is generally believed that the oil contained in coffee beans is oxidized, but this is not the main reason. Coffee beans contain a lot of antioxidants, and the rate of oil oxidation is actually very slow.

So what changed the flavor of coffee?

Yes, it's the aroma. When the baking is finished, the carbon dioxide volatilizes and takes away some of the aroma. The remaining aroma components begin to produce chemical reactions, the total amount of aroma decreases, the composition changes and deteriorates, and when it produces an uncomfortable taste, the coffee beans deteriorate.