Among the potential microorganisms that can be used in
the fermentation of agricultural wastes, fungi have been
known for their ability to produce enzymes that degrade the
cell wall of plants and may improve the chemical composition
and bioactivity of the substrates used. Fungi of the genus
Rhizopus and Aspergillus have been long used in SSF to
produce various types of products. These genera can produce
highly digestible proteins without any toxic substance being
generated within the controlled environment of fermentation
process. Aspergillus sp. have long been used in the production
of a traditional but highly nutritious tempeh and have also
been reported to be used in the production of pectinases
(Dartora et al., 2002). Production of aromatic volatile compounds
using Rhizopus strains grown on agro-industrial wastes
was studied by Christen et al. (2000).