What is citric acid in coffee?

Citric acid is one of the most prominent organic acids in Arabica coffee and a primary contributor to the bright, fruit-like acidity associated with high-quality washed coffees from origins like Ethiopia, Kenya, and Colombia.

It develops within the coffee cherry during maturation - higher-altitude, cooler growing conditions allow more time for acids including citric acid to accumulate in the seed. This is one of the key reasons altitude correlates with brighter, more vibrant cup character. Citric acid in coffee reads on the palate as clean brightness - the sensation associated with citrus fruit, which contains high concentrations of the same compound.

During roasting, citric acid is progressively degraded by heat, which is why darker roasts taste less bright than lighter ones from the same green coffee. It's most intact and expressive in light to medium roasts. On the SCA cupping form, the bright, citrus-like quality associated with citric acid contributes to the acidity score - one of the clearest indicators of green coffee quality.