What if there is no oil in espresso? what is the composition of espresso oil?
What is espresso? Espresso is a very small cup of coffee, which can be finished in two or three mouthfuls. Its flavor is so strong that it is difficult for many people to accept. Small cups and strong flavor are the reasons why espresso has a small audience in China, but lattes with milk and American coffee with water are very popular.
The appearance of espresso in the cup is black espresso at the bottom, with a layer of golden coffee oil floating on top. Is the coffee grease oil?
As we all know, peanut oil is extracted from peanuts, and the surface of deep-roasted coffee beans will be greasy. So what is the oil layer of espresso pressed by a coffee machine?
Italians will call the upper layer "Crema", and this unique and rich layer of Crema can only be made by an Italian coffee machine, the key lies in the pressure. Espresso will produce a 9bar water pressure to "squeeze" the coffee pressed powder. Because the carbon dioxide in the coffee powder is under too much pressure, the water is supersaturated to the carbon dioxide, so the carbon dioxide can not be released, so it is directly integrated into the coffee liquid. And in the process of extraction will emulsify the fat in the coffee, these fat will be wrapped in carbon dioxide, because it is lighter than water, all will gradually delaminate, golden oil will appear on the surface, very beautiful.
So this golden and delicate coffee oil is formed by the insoluble oil of coffee wrapped in carbon dioxide.
What if there is no fat in espresso? Deep-roasted coffee beans can be used for extraction, the ratio of water to powder can be reduced during extraction, and the embodiment of oil will be more obvious.
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