Concomitant Use of Fourier Transform Infrared Attenuated Total Reflectance Spectroscopy and Chemometrics for Quantification of Multiple Adulterants in Roasted and Ground Coffee

Figure 2

Average normalized ATR spectra obtained for roasted coffee (brown color), roasted coffee husks (pink color), spent coffee grounds (blue color), roasted barley (yellow color), and roasted corn (green color).