초록
<P>Crosslinked graft copolymers of CMC with <I>N</I>-vinyl-2-pyrrolidone (N-VP) were prepared in different grafting yields. <I>Saccharomyces bayanus</I> was immobilized in the graft copolymers of carboxymethylcellulose-g-poly(<I>N</I>-vinyl-2-pyrrolidone) (CMC-g-PVP) for ethanol fermentation. The effects of grafting yield, initial glucose concentration, and crosslinker concentration on the yield of ethanol process was investigated. Ethanol production increased when percentage of N-vinyl-2-pyrrolidone in the graft copolymer was increased. The maximum concentration, productivity, and yield of ethanol were 98.78 g L <SUP>−1</SUP>, 8.23 g L <SUP>−1</SUP> h <SUP>−1</SUP> and 0.494 g g <SUP>−1</SUP>, respectively. Reusability of the immobilized yeasts was found that the materials can be used seven times without losing their activity.</P>