An alternative route for flavour synthesis is based
on microbial biosynthesis or bioconversion (3–6). The most
popular approaches involve the use of microbial cultures
or enzyme preparations, although plant cell cultures
have also been reported as suitable production
systems (Fig. 1). Microorganisms can synthesize flavours
as secondary metabolites during fermentation on nutrients such as sugars and aminoacids. This capability may
be used in two different ways: