Isolation of β-Xylanase from whole broth of Bacillus amyloliquefaciens by adsorption on a matrix in fluidized bed with low degree of expansion

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β-1,4-Xylanase, produced extracellularly by Bacillus amyloliquefaciens MIR 32, was isolated directly from the culture broth by adsorption on a cation exchanger, Amberlite IRC-50, in fluidized bed with a low degree of expansion. The enzyme was eluted from the adsorbent by increase in pH, with a recovery of 82.3% and purification of 5.3 fold. About 99.99% of the colony forming units, 82% of the contaminating neutral protease activity, and 100% of the reducing sugars present in the crude feedstock were removed at the end of the purification cycle.

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