Study reveals endophytic fungi fermentation enhances coffee flavor

A study by the Kunming Institute of Botany, Chinese Academy of Sciences, recently opened a door of possibility by showing that fungi can be used to enhance the flavor of coffee.

A research team led by Qiu Minghua established a microbial repository containing 655 endophytic fungal strains from five Yunnan Arabica cultivars across three maturity stages and selected six representative strains that could make coffee more flavorful.

The standout strain, Talaromyces funiculosus KQ2, used as a fermentation agent, can raise the sensory score by 1.5 points, exceeding the specialty coffee threshold of 80 points, while imparting distinctive vanilla-cinnamon notes. Metabolomic analysis also showed a 17.11 percent increase in sucrose content.

Compared to introduced strains, the endophytic fungi, functioning as "primary processing plants" within coffee cherries, often exhibit stronger pectinase and cellulase activities and possess unique secondary metabolic pathways, enabling them to degrade pectin polysaccharides efficiently and significantly enrich the variety of flavor precursors.

The study was published in the journal Food Chemistry.

Yunnan is the largest producer of Arabica coffee in China. The province recently shifted from being a supplier of low-cost raw materials to emerging as a key player in the specialty coffee market, where maintaining a consistent flavor is crucial for the industry's sustainable development.