Abstract
The purpose of the present research is to study the production of thermophilic alkaline protease by a local isolate, Streptomyces sp. CN902, under solid state fermentation (SSF). Optimum SSF parameters for enzyme production have been determined. Various locally available agro-industrial residues have been screened individually or as mixtures for alkaline protease production in SSF. The combination of wheat bran (WB) with chopped date stones (CDS) (5:5) proved to be an efficient mixture for protease production as it gave the highest enzyme activity (90.50 U g−1) when compared to individual WB (74.50 U g−1) or CDS (69.50 U g−1) substrates. This mixed solid substrate was used for the production of protease from Streptomyces sp. CN902 under SSF. Maximal protease production (220.50 U g−1) was obtained with an initial moisture content of 60%, an inoculum level of 1 × 108 (spore g−1 substrate) when incubated at 45°C for 5 days. Supplementation of WB and CDS mixtures with yeast extract as a nitrogen source further increased protease production to 245.50 U g−1 under SSF. Our data demonstrated the usefulness of solid-state fermentation in the production of alkaline protease using WB and CDS mixtures as substrate. Moreover, this approach offered significant benefits due to abundant agro-industrial substrate availability and cheaper cost.
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Acknowledgments
We thank Professor Ezzedine Aouani for valuable discussion and critical reading of the manuscript. This work was supported by the “Ministère de l’enseignement supérieur, de la recherche scientifique et de la technologie” of Tunisia.
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Lazim, H., Mankai, H., Slama, N. et al. Production and optimization of thermophilic alkaline protease in solid-state fermentation by Streptomyces sp. CN902. J Ind Microbiol Biotechnol 36, 531–537 (2009). https://doi.org/10.1007/s10295-008-0523-6
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DOI: https://doi.org/10.1007/s10295-008-0523-6