However, no sensory research was found on the development of
aroma in each stage of preparation, starting from green coffee bean
to brewed coffee. This gap in research should be investigated
because 1) each stage plays a significant role in the development of
coffee aroma during the coffee brewing process, 2) sensory characteristics
need to be identified and quantified because not all the
present volatile compounds in a substance are perceived by
humans. The concentration of a given compound must exceed the
recognition threshold level in order to trigger the receptor response
in the brain to generate an image of the aroma (Czerny et al., 2008;
Grosch, 1998).