Comparison of Attenuated Total Reflectance Mid-Infrared, Near Infrared, and ¹H-Nuclear Magnetic Resonance Spectroscopies for the Determination of Coffee’s Geographical Origin

Figure 1

Results of discrimination by species, 7-fold cross-validation. Black represents ATR-mIR, red NIR, and blue ¹H-NMR. The squares show the mean of the values averaged over all 7 models; the error bars show the standard deviation of these . All techniques produced 100% accurate predictions at the top of the curves (2–4 components).