Role of Chlorogenic Acids in Coffee Beans
1. They Influence the Coffee’s Flavour
Chlorogenic acids are natural compounds that add brightness and pleasant sharpness to coffee.
- Higher CGAs → More acidity, more freshness
- Lower CGAs → Smoother, less tangy taste
This is why some beans taste lively and bright, while others feel mellow and soft.
2. They Affect Bitterness
During roasting, chlorogenic acids break down into other compounds that create part of coffee’s bitterness.
- Light roasts have more CGAs → slightly tangy and bright
- Dark roasts have less CGAs → stronger bitter notes from breakdown products
But this bitterness is not bad — it adds depth and richness.
3. They Protect the Bean (Natural Antioxidants)
CGAs are strong antioxidants, helping the coffee plant defend itself against:
- pests
- stress
- harsh sunlight
These antioxidants also stay in your cup, contributing to coffee’s well-known health benefits.
4. They Influence Aroma and Mouthfeel
As CGAs break down during roasting, they create aromatic compounds that add to:
- body
- smoothness
- complexity
This is why roasting transforms a raw bean’s herbal smell into a warm, coffee-like aroma.
5. They Affect Green Bean Quality
Before roasting, CGAs help determine:
- how fresh the green beans stay
- how well they store
- how they react during roasting
High-quality Arabica beans generally have lower CGA levels than Robusta, which is part of why Arabica tastes smoother.
