It was observed that different types of coffee processing
methods led to significant differences in the concentrations of free
amino acids, reducing sugars and phenolic compounds present in
green coffee beans of the same varietal (Arruda et al., 2012).
Furthermore, analysis of the polysaccharide fractions isolated from
differentially processed green coffee beans revealed differences in
the monosaccharide contents (rhamnose, arabinose, galactose
and mannose). This was attributed to the different extents of influence
to which different processing methods have on the structural
aspects of polysaccharides and the degradation of galactomannans
that were present in green coffee beans (Tarzia, dos Santos Scholz,
& de Oliveira Petkowicz, 2010). These are important coffee aroma
precursors and differences in the concentrations of these compounds
would therefore be responsible for the aroma quality differences
that were observed. While differences in the chemical
compositions of wet- and dry-processed green coffee beans have
been documented in detail, the extent to which these changes to
the non-volatile profiles translated into aroma profile differences
between differentially-processed coffees and the processes that
were responsible for these changes are less understood