Abstract
Thermophilic fungi are potential sources of thermostable enzymes and other value added products. Present study has focused on optimization of different physicochemical parameters for production of thermostable cellulases and xylanase by Thermoascus aurantiacus RCKK under SSF. Enzyme production was supported maximally on wheat bran fed with 20 % inoculum, at initial pH 5, temperature 45 °C and moisture ratio 1:3. The supplementation of wheat bran with yeast extract, Tween-80 and glycine further improved enzyme titres (CMCase 88 IU/g, FPase 15.8 IU/g, β-glucosidase 25.3 IU/g and xylanase 6,543 IU/g). The crude enzymes hydrolyzed phosphoric acid-swollen wheat straw, avicel and untreated xylan up to 74, 71 and 90 %, respectively. In addition, T. aurantiacus RCKK produced antioxidants as fermentation by-products with significant %DPPH∙ scavenging, FRAP and in vivo antioxidant capacity against H2O2-treated Saccharomyces cerevisiae. These capabilities show that it holds potential to exploit crop by-products for providing various commodities.
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Acknowledgments
The authors gratefully acknowledge financial support under major research project grant [F.2-2/2011 (SAP-II)] from University Grants Commission (UGC) and University of Delhi. KKJ also thanks CSIR for senior research fellowship during the course of this study.
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Jain, K.K., Bhanja Dey, T., Kumar, S. et al. Production of thermostable hydrolases (cellulases and xylanase) from Thermoascus aurantiacus RCKK: a potential fungus. Bioprocess Biosyst Eng 38, 787–796 (2015). https://doi.org/10.1007/s00449-014-1320-4
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DOI: https://doi.org/10.1007/s00449-014-1320-4