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This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 613688

Low-field 1H NMR spectroscopy for distinguishing between arabica and robusta ground roast coffees

Low-field 1H NMR spectroscopy for distinguishing between arabica and robusta ground roast coffees

Robusta coffee is harsh and bitter compared to the milder, more aromatic arabica. Robusta is also half the price so it’s tempting to cut ‘100% arabica’ ground coffee with robusta, giving an unfair price advantage and defrauding the consumer. This paper demonstrates a screening method based on low-field proton NMR that can detect between 10 and 20% of robusta mixed with arabica using a marker compound, 16-O-methylcafestol, that is present only in robusta. A calibration-free statistical approach for 16-OMC detection is described. An improved limit of detection is possible.

http://www.sciencedirect.com/science/article/pii/S0308814616312584