shows the
bidimensional representation of all the variables and coffee samples
according to the two selected Principal Components (PC). PC1 (65.2%
of the total variance) was mainly characterized by the CIELab color
parameters (L*, a* and b*) and the FolineCiocalteau reducing capacity.
It could be observed that PC1 distributed all the coffee samples
according to the roasting degree, being the dark samples on the
left half-part of the graphic, but independently of the origin, variety
and type of roasting process (conventional or torrefacto)