固定化木聚糖酶的方法及酶学性质的研究
发布时间:2018-05-23 20:47
本文选题:固定化酶 + 木聚糖酶 ; 参考:《吉林农业大学》2015年硕士论文
【摘要】:本研究分别以壳聚糖、海藻酸钠和D280大孔树脂为载体制备固定化木聚糖酶,对其固定化条件进行优化,并对固定化酶的酶学性质进行了研究,得到以下结论:1)制备了壳聚糖固定化木聚糖酶,单因素试验确定的最佳制备条件为:给酶量450U,固定化pH5.8,处理时间为5h,固定化温度为40℃;正交试验确定壳聚糖固定木聚糖酶的最优条件为:给酶量450U,固定化pH5.6,处理时间为5h,固定化温度为40℃,此时固定化木聚糖酶酶活力回收率最高,为35.6%;(2)制备了海藻酸钠固定化木聚糖酶,单因素试验确定的最佳制备条件为:给酶量360U,固定化pH5.8,处理时间为3h,固定化温度为30℃;对固定化条件进行正交试验优化,确定海藻酸钠固定木聚糖酶的最优条件为:给酶量360U,固定化pH5.6,处理时间为3h,处理温度为30℃,此时固定化木聚糖酶酶活力回收率为39.3%;(3)制备了D280大孔树脂固定化木聚糖酶,单因素试验确定的最佳制备条件为:给酶量450U,固定化pH5.3,处理时间为7h,固定化温度为50℃;对固定化条件进行正交试验优化,确定D280大孔树脂固定木聚糖酶的最优条件为:给酶量450U,固定化pH5.1,处理时间为8h,固定化温度为52℃,此时固定化木聚糖酶酶活力回收率为40.8%;(4)对三种载体制备的固定化酶酶学性质进行研究,与游离酶相比,三种固定化酶的储藏稳定性、热稳定性和酸碱稳定性均优于游离酶,其中D280大孔树脂效果最好。(5)对三种载体制备的固定化酶的酶促反应动力学进行了研究,与游离酶相比,三种固定化酶的Km均有所升高,Vmax均有所降低,但D280大孔树脂与游离酶相差最小,且基本处于同一水平,说明D280大孔树脂制备的固定化酶与底物亲和力最强。综上所述,以D280大孔树脂为载体固定化木聚糖酶在各项指标上均优于壳聚糖和海藻酸钠。
[Abstract]:In this study, chitosan, sodium alginate and D280 macroporous resin were used as carriers to prepare immobilized xylanase, and the immobilized conditions were optimized, and the enzymatic properties of immobilized xylanase were studied. The following conclusions were obtained: (1) chitosan immobilized xylanase was prepared. The optimum preparation conditions were determined by single factor experiment: enzyme dosage 450 U, immobilized pH 5.8, treatment time 5 h, immobilization temperature 40 鈩,
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