Chemical Composition and Flavor Profiles of Coffee

Coffee beans are complex biological matrices comprising carbohydrates, proteins, lipids, alkaloids and phenolic compounds. The two principal species, Arabica and Robusta, differ in caffeine content, lipid profile and chlorogenic acid composition, which in turn influence flavour and antioxidant properties. During roasting, the Maillard reaction and caramelisation generate hundreds of volatile organic compounds (VOCs) such as pyrazines, furans, aldehydes, ketones and phenols. These VOCs interact to produce characteristic aroma notes ranging from fruity and floral to nutty, caramel and smoky. Non-volatile constituents, including trigonelline, diterpenes and organic acids, contribute bitterness, acidity and body. Post-harvest processing (wet, dry or semi-dry methods), geographic origin, bean maturity and grinding size further modulate the extraction of these compounds. Brewing parameters—temperature, water chemistry, contact time and pressure—determine the solubility and balance of flavour precursors, ultimately shaping the sensory profile of the beverage. Understanding the interplay between chemical composition and flavour formation is vital for quality control, product innovation and meeting the diverse preferences of global consumers.

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Chemical Composition and Flavor Profiles of Coffee publication trend

The graph below shows the total number of articles in chemical composition and flavor profiles of coffee across all publications each year (not limited to Nature Index journals).

Technical terms

Chlorogenic acids: A family of cinnamate esters predominant in green coffee beans, influencing acidity, bitterness and antioxidant capacity.

Volatile organic compounds (VOCs): Small, low-molecular-weight molecules released during roasting and brewing that are responsible for coffee aroma.

Maillard reaction: A non-enzymatic chemical reaction between amino acids and reducing sugars during roasting, producing browning and a diverse range of flavour compounds.

SPME-GC-MS: Solid-phase microextraction coupled with gas chromatography–mass spectrometry, an analytical technique for isolating and identifying VOCs from coffee samples.

Organoleptic properties: Sensory characteristics of coffee, including aroma, flavour, acidity, bitterness and body, as perceived by human senses.

References

1. Variability of single bean coffee volatile compounds of Arabica and robusta roasted coffees analysed by SPME-GC-MS. Food Research International (2018).
2. Determination of volatile marker compounds of common coffee roast defects. Food Chemistry (2016).
3. Coffee Flavor: A Review. Beverages (2020).