Abstract
Authentic Luwak arabica coffees are expensive and available in the market in a very limited quantity. For this reason, feeding Luwak arabica coffees at a cheaper price is becoming popular for substitution the authentic Luwak arabica coffees in the specialty coffee market. In the form of coffee powder, it is quite hard to visually inspect the difference between authentic and feeding Luwak arabica coffees. In this study, we proposed a low-cost and eco-friendly approach to discriminate between authentic and feeding Luwak arabica coffees. This method works by preparing aqueous Luwak coffee samples using hot-distilled water. The absorbance data of a total of 200 samples of authentic and feeding Luwak arabica coffees in the wavelength of 190-1100 nm were obtained using a benchtop UV-visible spectrometer. Chemometrics using both unsupervised and supervised methods were demonstrated. The results confirmed authentic Luwak arabica coffees could be well discriminated from feeding Luwak arabica coffees with sensitivity, specificity, and accuracy of 100% could be obtained. This method could be easily implemented in the specialty coffee market to avoid Luwak coffee fraud.
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