Direct electrochemical black coffee quality appraisal using cyclic voltammetry
2 days ago
- #Electrochemical Sensing
- #Cyclic Voltammetry
- #Coffee Quality
- Cyclic voltammetry (CV) with a platinum electrode can measure black coffee's beverage strength (linear relation to current) and roast color (via suppression of current) without sample preparation.
- The electrochemical response correlates with protonic reactions (hydrogen underpotential deposition, HUPD) and organic adsorption (e.g., caffeine, chlorogenic acids) on the electrode surface.
- Roast color dictates chemical composition: darker roasts show less charge passed at the same total dissolved solids (TDS) strength, enabling decoupling of strength and roast.
- The method successfully discriminated between acceptable and rejected coffee batches in a roastery quality control test, matching sensory evaluation.
- Cyclic voltammetry offers a rapid, in situ alternative to refractive index measurements for assessing coffee quality, sensitive to flavor-correlated properties.