Coffee Chemistry
An accessible guide to the major chemical components of coffee and how processing, roasting, grinding, brewing and storage change them.
Coffee is chemically complex
Coffee contains carbohydrates, lipids, proteins, minerals, caffeine, chlorogenic acids and hundreds of volatile and non-volatile compounds. The exact composition depends on species, variety, environment, processing and roast.
Green coffee versus roasted coffee
Roasting transforms the raw material. Water is lost, sugars and amino compounds participate in reactions, acids change, gases form and new aroma compounds are generated.
What reaches the cup?
Brewing extracts only a fraction of the roasted coffee. Solubility, particle size, temperature, water composition and contact time determine which compounds move into the beverage.
Chemistry is not a flavour dictionary
A compound can contribute to aroma, taste, mouthfeel or bitterness, but perceived flavour is the result of many compounds interacting with concentration, temperature and sensory context.
Continue exploring
Green coffee
Follow coffee from plant and cherry through processing, drying, milling and storage.
Green coffee →Coffee chemistry
Explore the compounds and reactions that shape roasted coffee.
Coffee chemistry →Coffee extraction
Connect grind, water, temperature, time, concentration and extraction.
Coffee extraction →Coffee Knowledge presents technical subjects as an educational reference. Terminology, grading systems and production practices can vary by country, producer, equipment and commercial context.