1. Extraction:
* Water as a solvent: Hot water acts as a solvent, dissolving soluble compounds from the coffee grounds.
* Extraction of caffeine, acids, and oils: These compounds, along with other flavor molecules, are extracted from the coffee beans.
2. Chemical changes:
* Hydrolysis: Water molecules break down some of the coffee compounds, releasing more flavor molecules.
* Maillard reaction: This reaction, which occurs between sugars and amino acids, creates hundreds of new aroma and flavor compounds, giving coffee its distinctive taste.
3. Other Reactions:
* Decomposition of sugars: Some sugars in the coffee beans break down into simpler compounds, contributing to the sweetness.
* Oxidation: Exposure to air can oxidize some coffee compounds, changing the flavor profile.
In summary, making a cup of coffee involves complex chemical reactions that extract and transform compounds from the coffee beans, ultimately creating the rich and flavorful beverage we enjoy.
