Onyegeme-Okerenta, B. M. and Chinedu, S. N. and Okochi, V. I. and Okafor, U. A.
Agro-waste: a potential fermentation substrate for Penicillium chrysogenum.
International Journal of Biological and Chemical Sciences, 3 (2).
Common agro-wastes found in Lagos, Nigeria (cassava shavings, corncob, sawdust, and sugarcane
pulp) were compared with glucose and lactose as fermentation substrates for Penicillium chrysogenum
PCL501. Cassava shavings significantly (P<0.001) produced the highest amount of mycelia weight (0.43 ±
0.02 mg/ml) than all the other substrates. This was followed by corncob with peak mycelia weight of 0.33 ±
0.02 mg/ml. Peak mycelia weight of 0.27 ± 0.01 mg/ml was equally obtained with glucose and sugarcane pulp
whereas lactose gave a slightly lower peak of 0.25 ± 0.01 mg/ml. Sawdust gave the least mycelia weight of
0.13 ± 0.01 mg/ml. Total sugar content of all the culture media steadily decreased as fungal growth progressed
indicating that the organism utilized carbohydrates for growth and mycelia formation. Cultures containing
cassava shavings and sawdust gave high protein peaks of 0.84 ± 0.05 and 0.65 ± 0.03 mg/ml respectively.
Cultures containing corncob, glucose, lactose and sugarcane pulp yielded lower protein peaks of 0.37 ± 0.02,
0.30 ± 0.02, 0.24 ± 0.02 and 0.18 ± 0.01 mg/ml respectively. The results suggest that cassava shavings,
corncob and sugarcane pulp could serve as cheap fermentation substrates for the growth of the fungus. Of all
the substrates investigated, cassava shavings have the best potential to serve as substrate for fermentation by
Penicillium chrysogenum PCL501.
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