✦ LIBER ✦

Different factors affecting growth and amylase production by fungi inhabiting poultry feeds

✍ Scribed by Dr. A.-L. E. Mahmoud

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 330 KB
Volume: 33
Category: Article
ISSN: 0233-111X
DOI: 10.1002/jobm.3620330309

No coin nor oath required. For personal study only.

✦ Synopsis

Extracellular amylase synthesis by Aspergillus f l a w s 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.flaous while yeast extract achieved maximum enzymatic yield by A . fumigatus.

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