Author(s): Vu VH, Pham TA, Kim K
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Abstract Spores of Aspergillus sp. SU14 were treated repeatedly and sequentially with Co(60) γ-rays, ultraviolet irradiation, and N-methyl-N'-nitro-N-nitrosoguanidine. One selected mutant strain, Aspergillus sp. SU14-M15, produced cellulase in a yield 2.2-fold exceeding that of the wild type. Optimal conditions for the production of cellulase by the mutant fungal strain using solid-state fermentation were examined. The medium consisted of wheat-bran supplemented with 1\% (w/w) urea or NH(4)Cl, 1\% (w/w) rice starch, 2.5 mM MgCl(2), and 0.05\% (v/w) Tween 80. Optimal moisture content and initial pH was 50\% (v/w) and 3.5, respectively, and optimal aeration area was 3/100 (inoculated wheat bran/container). The medium was inoculated with 25\% 48 hr seeding culture and fermented at 35℃ for 3 days. The resulting cellulase yield was 8.5-fold more than that of the wild type strain grown on the basal wheat bran medium.
This article was published in Mycobiology
and referenced in Journal of Addiction Research & Therapy