Purification of xylanase was effected by ammonium sulfate fractionation and by carboxymethyl sephadex (CM-Sephadex) chromatography. Ammonium sulfate precipitated protein was dissolved in small quantity of buffer and subjected to dialysis against same buffer. The dialyzed preparation was applied to carboxymethyl sephadex column (20 cm  1 cm), which was preequilibrated with phosphate buffer (50 mM, pH 8). The unbound run through was collected, and after washing the column with phosphate buffer (50 mM, pH 8), elution was carried out using 0–0.5 M continuous sodium chloride gradient and fractions of 5.0 ml each, were collected. Protein suspected to be still bound was eluted using 1 M NaCl (25 ml). Fractions collected were tested for xylanase activity and protein content.
Purification of xylanase was effected by ammonium sulfate fractionation and by carboxymethyl sephadex (CM-Sephadex) chromatography. Ammonium sulfate precipitated protein was dissolved in small quantity of buffer and subjected to dialysis against same buffer. The dialyzed preparation was applied to carboxymethyl sephadex column (20 cm  1 cm), which was preequilibrated with phosphate buffer (50 mM, pH 8). The unbound run through was collected, and after washing the column with phosphate buffer (50 mM, pH 8), elution was carried out using 0–0.5 M continuous sodium chloride gradient and fractions of 5.0 ml each, were collected. Protein suspected to be still bound was eluted using 1 M NaCl (25 ml). Fractions collected were tested for xylanase activity and protein content.
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