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Different factors affecting growth and amylase production by fungi inhabiting poultry feeds
Author(s) -
Mahmoud A.L. E.
Publication year - 1993
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620330309
Subject(s) - amylase , aspergillus fumigatus , food science , sucrose , mycelium , starch , yeast extract , aspergillus flavus , chemistry , incubation , biology , extracellular , biochemistry , enzyme , microbiology and biotechnology , botany , fermentation
Extracellular amylase synthesis by Aspergillus flavus and A. fumigatus , isolated from poultry feeds, was studied in stationary liquid medium. Maximum mycelium and extracellular amylase were produced after 7 days of incubation at 30 °C and after 5 days at 35 °C by A. flavus and A. fumigatus , respectively. Optimal amylase yield was obtained at pH 8 and 6 by the two fungi, respectively. Amylase production did not depend on the presence of starch in the growth medium but its inclusion in the medium enhanced amylase production by A. fumigatus . Sucrose appeared to be a poor carbon source for amylase synthesis by the test fungi. Growth on varying nitrogen sources showed that glycine promoted amylase production by A. flavus while yeast extract achieved maximum enzymatic yield by A. fumigatus .