Conclusions
In relation to the different test strains, A. niger was
the best producer of extracellular lipase and its synthesis
is induced by the presence of a lipid source. Moderate
enzyme activity (9.14 IU/g dss) was obtained in SSF
using wheat bran, which to the best of the author’s knowledge
are amongst the highest extracellular lipase activities
reported in the literature concerning fungal sources.
This lipase has some properties in common with lipases
from other A. niger strains. This enzyme is also stable
over a broad pH range, 4 to 7, for a period of 24 hours
at 30 °C.
Due to the fact that these microorganisms are generally
recognized as safe (GRAS) for food, brewing and
pharmaceutical applications, more research is necessary
to optimize the fermentative process in order to obtain
higher lipase production through this strain.