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Purification and Characterization of an Antifungal Chitinase from Citrobacter freundii str. nov. haritD11

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Abstract

The purpose of the research was to study the purification and partial characterization of antifungal alkaline chitinase from a newly isolated Citrobacter freundii haritD11. The enzyme was purified in a three-step procedure involving ammonium sulfate precipitation, dialysis, and Sephadex G-100 gel filtration chromatography. The enzyme was shown to have a relative high molecular weight of 64 kDa by sodium dodecyl sulfate polyacrylamide gel electrophoresis and was purified 7.3-fold with a yield of 18.8 %. It was most active at 35 °C, pH 8.0, with colloid chitin as substrate and was very stable at alkaline pH contradicting the characteristic that most of the bacterial chitinases are active at acidic pH. Further, the purified chitinase exhibited remarkable antifungal activity against pathogenic fungi Aspergillus flavus MTCC 2798 and Aspergillus niger MTCC 9652 showing diametric inhibition zones of 27 mm and 21 mm, respectively.

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Correspondence to Haritha Meruvu.

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Meruvu, H., Donthireddy, S.R.R. Purification and Characterization of an Antifungal Chitinase from Citrobacter freundii str. nov. haritD11. Appl Biochem Biotechnol 172, 196–205 (2014). https://doi.org/10.1007/s12010-013-0540-4

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