Time course of growth and antibiotic production
Fermentation was carried out in ISP2 broth medium for 10 days
in order to select the culture time favorable for antibiotic production
from strain SA198. The 500-ml Erlenmeyer flasks containing
100 ml of medium were inoculated with 3ml of a pre-culture broth
of strain SA198 prepared with the same medium and incubated at
30 ◦C for 2 days. The cultures were incubated on a rotary shaker
(250 rpm) at 30 ◦C for 10 days. Changes in pH, growth (dry weight
of mycelium), and antibiotic production were examined daily. The
antimicrobial activity in the culture broth was monitored by the
conventional agar diffusion assay (well technique) using Bacillus
subtilis, Aspergillus carbonarius and Mucor ramannianus. Each 10-
mm-diameter well was filled with 0.2 ml of supernatant