Abstract
The surface of polyacrylonitrile fibers and membrane were modified by nitrilase from Escherichia coli BL21 (DE3)/pET-Nit. Escherichia coli BL21(DE3)/pET-Nit was able to convert nitrile groups on PAN fibers and membrane to corresponding carboxylic acid as indicated by X-ray photoelectron spectroscopy (XPS). An increase of O/C atomic ratio on the fiber and membrane surface showed an increase in hydrophilicity and fabric-dyeing efficiency. Strength of treated fiber decreased by only 1.17%, because only surfacial nitrile groups of acrylic fibers were hydrolyzed by E.coli BL21(DE3)/pET-Nit.
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