2.2. Extraction procedure
A. niger strain SS10 was grown on PDA (Difco, USA) at
30 ± 2 C for seven days and obtained as mycelia in a liquid
culture of potato dextrose broth (PDB) (Difco, USA), prepared
as per the manufacturer’s instructions. Aliquots of the
media (250 mL) were decanted into individual 1000-mL Erlenmeyer
flasks, closed with cotton wool stoppers placed over the
flask mouths, and then autoclaved at 121 C and 1.4 kg cm1
for 15 min. After the flask cooled down, the fungal mycelium
on the culture plates was cut in disks, 5 mm in diameter, and
placed in the center of the broth-cultured flask. The cotton
wool stoppers were then wrapped with aluminum foil, sealed
with parafilm, and incubated at 30 ± 2 C (12-h-darkness/
12-h-light cycle) on a rotary shaker for 14 days at 120 rpm
for the culturing of A. niger.
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