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Production and purification of high levels of cellulase-free bacterial xylanase by Bacillus sp. SV-34S using agro-residue

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Abstract

Xylanase produced from the isolated bacterial strain Bacillus sp. SV-34S showed a 8.74-fold increase in enzyme activity under optimized submerged fermentation conditions. Cultivation using wheat bran as the carbon source and beef extract and (NH4)H2PO4 as the nitrogen source resulted in productivity of 3,454.01 IU/mL xylanase. Xylanase was purified by 12.94-fold, with a recovery of 13.4 % and a specific activity of 3417.2 IU/mg protein, employing ammonium sulphate fractionation followed by cation-exchange chromatography using CM-Sephadex C-50 column chromatography, with a product of 27 kDa. The purified xylanase showed an optimum temperature and pH of 50 °C and 6.5, respectively although it was active even at pH 11.0. The thermostability study revealed that Bacillus sp. SV-34S was thermotolerant, being stable up to 50 °C; the residual activity at 55 and 60 °C was 96 and 93 %, respectively. The enzyme was stable between pH 6.0 and 8.0, although it retained >100 % activity at pH 8.0 and 9.0, respectively, following pre-incubation for 24 h. Xylanase activity was inhibited by various metal ions added to the assay mixture, with maximum inhibition observed in the presence of HgCl2. The Km and Vmax values of the purified xylanase using birch wood xylan as substrate were 3.7 mg/mL and 133.33 IU/mL, respectively. The isolated bacterial strain produced high levels of extremophilic cellulase-free xylanase. The fact that it can be used in crude form and that it can be produced cheaply with renewable carbon sources make the process economically feasible. The characteristics of the purified enzyme suggest its potential application in industries such as the paper and pulp industry.

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Acknowledgment

Mr. Sushil Nagar greatly acknowledges the financial assistance from University Grants Commission, India as Senior Research Fellowship under the Rajiv Gandhi National Fellowship Scheme.

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Correspondence to Vijay Kumar Gupta.

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Mittal, A., Nagar, S. & Gupta, V.K. Production and purification of high levels of cellulase-free bacterial xylanase by Bacillus sp. SV-34S using agro-residue. Ann Microbiol 63, 1157–1167 (2013). https://doi.org/10.1007/s13213-012-0574-9

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  • DOI: https://doi.org/10.1007/s13213-012-0574-9

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