Nowadays, low-caffeine coffee in the market means that before roasting, the coffee beans were separated out 94 to 98 percent of thecaffeine, which greatly reduce the caffeine content of coffee.
As far as one way degassing valve know, the famous German poet Goethe was a coffee lover, but he suffered from being unable to fall asleep after drinking coffee. The feeling of liking but not being close makes Goethe to ask his good friend Runge to analyze the component and find out the reason that coffee hinders sleep. About 1820 AD, Runge found out what factors affecting sleep is caffeine and he worked out a method to separate the caffeine from coffee beans, thus Runge became the father of low-caffeine coffee.
At that time, although Runge found out the factor that affects sleep, the technology to extracted caffeine resulted in the low production of low-caffeine coffee. Until 1903 AD, an importer of coffee beans named Ludwig Roselius from Germany found that once soaked by sea water, the caffeine content of coffee beans would substantially reduce. Then he employed a group of chemists to research and to develop the technology of extracting caffeine, which made a breakthrough in extraction technology and mass production of low-caffeine coffee.
lthough it was Runge who found out the main factors affecting sleep, the pusher of low-caffeine coffee was the great poet Goethe.