M. Suchanek et al., QUALITATIVE-ANALYSIS OF GREEN COFFEE BY INFRARED SPECTROMETRY, Fresenius' journal of analytical chemistry, 354(3), 1996, pp. 327-332
Principal component analysis and linear discriminant analysis (LDA) we
re applied to the mid-infrared spectra for the qualitative analysis of
the variety of green coffee (Arabica and Robusta). It is shown that t
he KBr pellet technique in combination with the LDA method can success
fully be used for the identification of sample origin.