The technique of solid-state fermentation (SSF) involves
the growth and metabolism of microorganisms
on moist solids without any free flowing water. SSF has
many advantages over submerged fermentation (SmF),
including an economical use of space that is required for
fermentation, simplification of the fermentation media,
superior yields and no requirement for complex machinery
(8). However, SSF has some limitations such as a
poor pool of microorganisms capable of growth under
restricted conditions and the controlling and monitoring
of parameters such as temperature, pH, humidity and
air flow (9). Although the vast majority of the literature
on SSF refers to fungal systems, there are actually very
few reports on lipase production in SSF by A. niger
(10,11).