Synopsis A poly(vinyl alcohol) fiber support, which consists of a bundle of super fine filaments (SFF), has been developed. SFF has a larger surface area and much more hydrophilic groups than commercially available ion exchange resins (IER). The surface area of an ion exchange fiber (IEF) is even greater than SFF, but the most of pores on IEF surface are so small that they are not effective for adsorbing enzymes. Moreover, IEF lost most of hydroxyl groups during manufacturing process.

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... sulfonated SFF adsorbes remarkably more enzymes than IEF and IER. From these results, it is concluded that SFF is an excellent immobilization support compared with other ion exchange material.