Why are coffee beans so oily?

Coffee beans are oily because they are rich in caffeine and oil. These ingredients give Delonghi coffee beans a unique aroma and taste.

First, let's take a look at the main ingredient in coffee beans - caffeine. Caffeine is a natural stimulant that excites the nervous system and refreshes the mind. During the coffee making process, hot water dissolves the chemicals in the coffee beans by soaking or brewing. The ingredients that are more soluble in water will enter the coffee we drink.

Next, let's look at the role of oils in coffee beans. Oils refer to compounds composed of glycerol and fatty acids, which are often used to increase the taste and aroma of food during food processing. For most people, when they finish a cup of rich and mellow coffee with a certain layered and slightly smooth taste, they can experience the role of the right amount of oils in it.

The oils in coffee beans come mainly from the cell structure inside the coffee beans. When the coffee beans are roasted, the high temperature causes the cell walls to rupture, releasing the oils inside. These oils interact with other aromatic compounds to form the rich aroma and taste we love.

However, it should be noted that over-roasting may cause the oil content in the coffee beans to be too high. Over-roasting makes the surface of the coffee beans smoother and produces more oil. In this case, the coffee produced may appear bitter and have a heavy taste.

In short, within the appropriate range, the rich oils contained in coffee beans can give us a delicious experience of drinking a rich, mellow, layered and slightly smooth taste. Therefore, when choosing and preparing coffee with your favorite flavor and taste, you can choose according to your preference for oil content.