section_path: Pharmacology/Caffeine content
section_name: Caffeine content
paragraph_text: Caffeine content
  
  Depending on the type of coffee and method of preparation, the caffeine content of a single serving can vary greatly. The caffeine content of a cup of coffee varies depending mainly on the brewing method, and also on the coffee variety. According to the USDA National Nutrient Database, a 240-millilitre (8 US fl oz) cup of "coffee brewed from grounds" contains 95 mg caffeine, whereas an espresso (25 mL) contains 53 mg. According to an article in the Journal of the American Dietetic Association, coffee has the following caffeine content, depending on how it is prepared:
  
  Caffeine remains stable up to 200 °C (392 °F) and completely decomposes around 285 °C (545 °F). Given that roasting temperatures do not exceed 200 °C (392 °F) for long and rarely if ever reach 285 °C (545 °F), the caffeine content of a coffee is not likely changed much by the roasting process.