Why do coffee beans produce oil?

Coffee beans are a natural food that is rich in oil. When coffee beans are roasted, the oil inside is released to form the oil seen on the surface.

First of all, coffee beans contain a lot of fat. These fats are heated during the roasting process and gradually dissolved inside the coffee beans. As the temperature rises, these dissolved oils begin to transfer to the surface and gradually form a bright and smooth appearance.

Secondly, during the roasting process, coffee beans undergo chemical reactions. When coffee beans are heated at high temperatures, the acids and ketones present in them undergo decomposition and oxidation reactions. These reactions produce a series of volatile compounds and gases, which, when in contact with air, produce aromatic substances with a strong aroma and special flavor.

Finally, water also evaporates from the coffee beans during dry or wet processing at high temperatures. As the water evaporates, the oils inside the coffee beans gradually float out and gather on the surface. These oils give the coffee beans their shine and smoothness, and are also an important factor in maintaining their flavor and taste after roasting.

In short, coffee beans produce oil because they contain rich fats, which are released after being heated at high temperatures during the roasting process. These oils not only give coffee beans special appearance characteristics, but also bring them a rich and complex aroma and taste.