Friday 14 March 2025
Scientists have long sought a way to measure the quality of coffee without relying on human taste testers or complicated chemical analysis. Now, researchers at the University of Oregon and Drexel University have made a breakthrough in developing an electrochemical method that can determine the strength and roast level of coffee.
The new technique uses cyclic voltammetry, a process where an electrode is scanned through different potentials to measure the current response of a solution. In this case, the solution is brewed coffee. The researchers found that the current response is related to the concentration of solvated compounds in the coffee, which can be used to determine its strength.
To test their method, the scientists analyzed over 30 samples of coffee from different roasters and brewing methods. They compared the results with traditional methods, such as measuring the refractive index or density of the coffee, and found that their electrochemical method was more accurate and reliable.
The researchers also discovered that the current response is influenced by the roast level of the coffee beans. Darker roasted coffees produce a stronger signal than lighter roasted ones, which can be used to determine the roast level without relying on visual inspection or flavor profiling.
One of the advantages of this method is its ability to analyze coffee in real-time, making it possible to adjust brewing parameters to achieve the desired strength and flavor. This could revolutionize the way coffee is brewed at home and in commercial settings.
The team also used mass spectrometry to identify the compounds responsible for the current response. They found that caffeine, a major component of coffee, plays a significant role in the signal. However, other compounds, such as chlorogenic acids, were also detected and may contribute to the flavor profile of the coffee.
While this method is still in its early stages, it has the potential to become a standard tool for coffee quality control. It could also be used to develop new brewing methods that optimize flavor and strength. For coffee enthusiasts, this means better-tasting coffee with more consistency and less waste.
Cite this article: “Electrochemical Method for Measuring Coffee Quality”, The Science Archive, 2025.
Coffee, Electrochemical, Cyclic Voltammetry, Coffee Quality, Roast Level, Strength, Brewing, Caffeine, Chlorogenic Acids, Mass Spectrometry
