It's magic, right? Scientists explain how to make a cup of cold coffee in 3 minutes!

The heat waves came one after another, and a cup of cold coffee became a sacred drink in summer. However, cold-brewed coffee has been made for a long time and has become an unreachable summer holy water. With the development of science and technology, as a human barista, there are machines that can be replaced perfectly, and cold coffee certainly no longer needs to wait 12 hours, but 3 minutes.

It is well known that cold-extracted coffee has much lower acidity and bitterness than hot water-extracted coffee. This is because when water comes into contact with coffee powder, the extracted coffee flavor substances and the amount of substances have a great relationship with the temperature of the water.

For example, if hot water is used to extract a coffee bean with strong nutty flavor, it is easier to dissolve nut flavor substances at high temperature; on the contrary, low temperature water dissolves bitter and other flavor substances with larger molecules more slowly, tastes warmer and mellow, and is more acceptable.

However, it takes too much time to make a cup of cold coffee, which usually takes more than 12 hours. when it is really done, you may have no desire to drink it. Fortunately, as one of the most popular drinks in the world, coffee lovers are naturally found all over the world and in all kinds of industries.

The development of science has also brought more convenience to human life. With the blessing of science and technology, it may no longer take that long to make cold-brewed coffee. The chemical research team at Essen University in Duisburg, Germany, used a pulsed laser to illuminate a mixture of coffee powder and water, making a cup of cold-extracted coffee in just three minutes.

Some people may wonder if the laser will not heat up this cup of coffee instantly. However, according to the introduction, the whole process, the laser heated the coffee liquid about 5 degrees Celsius.

In addition, the researchers compared coffee extracted in three minutes with cold coffee extracted for 24 hours and coffee extracted by traditional hot water. As a result, the researchers found that: in terms of acidity, the coffee brewed with a laser for 3 minutes was almost the same as a 24-hour cold brewed coffee, while the acidity of the two mentioned above was significantly lower than that of coffee extracted by hot water; at the caffeine level, laser-extracted coffee contains less caffeine than traditional cold-brewed coffee.

Pulsed laser-accelerated extraction of cold-soaked coffee can shorten the extraction process that would have taken hours to just a few minutes, opening up many exciting possibilities for cold-extracted coffee. However, this technology now exists only in science laboratories and has not yet been popularized.

The research team has high hopes for the commercialization of pulsed laser coffee extraction and plans to develop it, according to technology media Slash Gear. Maybe in the near future, we will see the scene of baristas using laser to extract coffee in cafes.

Photo Source: Internet

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