从草鱼肠道中分离筛选出6株产木聚糖酶的菌株,从中挑选产酶量最大的菌株测定酶液活力,并采用壳聚糖、海藻酸钠等固定游离酶.结果表明,与游离酶相比,壳聚糖固定酶的最适pH向碱性方向偏移,海藻酸钠固定酶的最适pH向酸性方向偏移.与游离酶相比,固定化酶有较高的最适温度和较强的热稳定性.%6 xylanase producing strains were screened from the intestinal tract of grass carp, among -which the strain with the highest xylanase yield was adopted to detect the enzyme activity of xylanase. Furthermore, the xylanase was immobilized by chitosan and sodium alginate. The results showed that compared with free enzyme, the optimal pH for chitosan immobilized xylanase was higher while for sodium alginate immobilized xylanase was lower. The optimal temperature for the immobilized xylanase was higher than that of free enzyme. The immobilized xylanase also showed broader temperature adaptability.
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