Chemists from Thomas Jefferson University in the US have come to the conclusion that brewing coffee cold process leads to increased concentration of caffeine in the drink. The work of scientists published Scientific Reports.
It is noted that studied four types of coffee. Drinks compared with traditional brewing with boiling water and cold method (preparation takes from 10 hours to days in water at room temperature).
The study used the grain medium and dark roast, coarse and medium grinding.
The chemical composition of the resulting beverage was compared and came to the conclusion that when cold brewing coffee, for example, dark roast coffee and coarse grinding, stands out 1000 milligrams of caffeine per liter of beverage. And when making coffee with boiling water the concentration is no more than 800 milligrams.
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