mozambioside
compound / compound-mozambioside
モザンビオシド
Mozambioside is a bitter furanocumarin glycoside found uniquely in Arabica coffee beans. During roasting it decomposes into a group of degradation products with lower bitterness thresholds.
On this page (8 sections)
Reading the bitterness
Mozambioside is a bitter furanocumarin glycoside found uniquely in Arabica coffee beans. It exists concentrated in Arabica during the green bean stage, and transforms into a group of degradation products with lower bitterness thresholds during roasting—this transformation is why this compound is studied at this bitterness research lab.
Quantification by UPLC-HDMS showed a concentration difference large enough to distinguish species: approximately 396–1188 nmol/g in Arabica green beans, versus less than 5 nmol/g in Robusta. In roasted Arabica beans, the concentration declined to 232±37 nmol/g, and extraction recovery was reported at 86–98%.
Regarding the recognition threshold for bitterness, one 2015 study reported 60±10 µmol/L in aqueous solution, while a 2025 study reported the same compound's threshold at 132 µM—a gap of approximately 2.2-fold. Both reports trace to roughly the same research lineage; panel differences, compound purity, and methodological differences have been proposed as possible causes, but they cannot be pinned down within the scope of abstracts alone. This is an example demonstrating that a threshold cannot be treated as a single value.
The thermal decomposition products that form as mozambioside breaks down during roasting include glucosyl cafestol-type derivatives, several of which show lower human thresholds (27–80 µM) than the parent compound (132 µM). Measured from actual roasted coffee powder at 21.0–170.4 nmol/g with extraction recovery of approximately 41–128%, a mixture at this concentration in coffee was reported to be recognized as bitter by 80% of a panel. Sensitivity correlated with an intact TAS2R43 locus.
On the receptor side, that a pair of bitter taste receptors—TAS2R43 and TAS2R46—responds to mozambioside with sensitivity far exceeding that to caffeine was previously shown using cultured cells and functional calcium imaging. Structurally related compounds cafestol and kawheol are reported to also activate this receptor pair more strongly than caffeine; when kawheol is given simultaneously with mozambioside, it has been reported to act as a weak partial agonist with inhibitory effect. This finding, in prior form, supports the explanation that roasting-derived products transmit bitterness through the same receptor pair.
Sources for this overview
Mozambioside Is an Arabica-Specific Bitter-Tasting Furokaurane Glucoside in Coffee Beans
Checked for this overview: Confirmed as a bitter furanocumarin glycoside specific to Arabica. / Confirmed concentration values in green and roasted beans and extraction recovery rates. / Confirmed 2015 report threshold of 60±10 µM.
Contribution of mozambioside roasting products to coffee's bitter taste
Checked for this overview: Confirmed 2025 report threshold of 132 µM and discrepancy. / Confirmed concentration of degradation products in coffee, human thresholds, and genetic correlation.
Identification of mozambioside roasting products and their bitter taste receptor activation
Checked for this overview: Confirmed structure of 5 degradation products and their thresholds lower than the parent compound.
Numerous Compounds Orchestrate Coffee's Bitterness
Checked for this overview: Confirmed high-sensitivity response of TAS2R43/46 and action of structurally related compounds.
Measured values (2)
| Kind | Compound | Target | Value | Conditions | Source |
|---|---|---|---|---|---|
| human recognition threshold | mozambioside | — | 60±10 µM | aqueous solution (132 µM (2025), under dispute) | Lang R, 2015 |
| human recognition threshold | mozambioside | — | 132 µM | aqueous solution (60±10 µM (2015), under dispute) | Bichlmaier C, 2025 |
Values are the reported values of each source (with units and conditions). Thresholds and EC50 depend on the panel and method; they are not single true values.
Structured claims — open a section to read each claim's confidence, evidence and limits
Composition and content (1)
Scope: Quantified by UPLC-HDMS. Decreases to 232±37 nmol/g in roasted beans; extraction rate 86-98%
Show data
compound-mozambioside —is_marker_for→ "Arabica (396-1188 nmol/g in green beans; robusta is <5 nmol/g)"Sensory (1)
Scope: Human recognition threshold in aqueous solution
Note: NIGAMI LAB's first contested claim. The threshold is panel- and method-dependent, an example that it cannot be treated as a single fixed value.
Show data
compound-mozambioside —has_bitter_recognition_threshold→ "60±10 µM (2015) and 132 µM (2025) — roughly a 2-fold discrepancy within the same lineage of laboratories"How processing and cooking change it (1)
Scope: HEK293T cell assay plus human threshold measurement. A mixture at coffee-level concentrations was recognized as bitter by 80% of the panel. Sensitivity correlated with whether the TAS2R43 gene locus was intact
Note: That chicory bitterness is received by the same TAS2R43/46 connects to Research Note 002.
Show data
compound-mozambioside —degrades_into_more_potent_bitter_compounds_via→ "Roasting-derived breakdown products (glucosylated cafestol derivatives, bengalensol, and others) have a lower bitterness threshold than the parent compound (27–80 µM vs 132 µM) and activate TAS2R43/46"