When did Friedlieb Ferdinand Runge isolate caffeine?
Friedlieb Ferdinand Runge isolated caffeine in 1819 while working at a Berlin laboratory. He named the white crystalline powder he extracted from coffee beans Kaffebase.
Questions about Caffeine
Short answers, pulled from the story.
How does caffeine affect adenosine receptors in the brain?
Caffeine acts as a competitive antagonist on four different adenosine receptor subtypes including A1, A2A, A2B, and A3. This mechanism blocks natural depressant effects of adenosine to prevent drowsiness and maintain alertness.
What is the lethal dose of caffeine for an average adult?
A lethal dose for humans is estimated between 10 and 14 grams for an average adult weighing 70 kilograms. This quantity equals roughly 75 to 100 cups of coffee consumed simultaneously or less than a tablespoon of pure powdered supplements.
Which plant species produce caffeine naturally?
Around thirty plant species produce caffeine naturally within their seeds or leaves. Common sources include the beans of Coffea arabica plants which contain about 1.3 percent caffeine by weight and tea leaves from Camellia sinensis.
When did Hermann Emil Fischer determine the molecular structure of caffeine?
Hermann Emil Fischer achieved total synthesis from chemical components in 1895 and determined its molecular structure two years later. These discoveries earned Fischer the Nobel Prize in Chemistry awarded in 1902.