采用酶解双醛淀粉固定化脲酶，并对相应的固定化脲酶的性质进行了研究．扫描电镜分析表明，酶解双醛淀粉固定化脲酶后，载体之间形成较大的团状．研究发现：酶解双醛淀粉固定化脲酶量达到24．3％；酶解双醛淀粉固定化脲酶的最适pH值为6．0，最造作用温度为70℃；固定化脲酶具有很好的储存稳定性和较高的米氏常数，且重复使用10次后的活力仅下降约25％．说明酶解双醛淀粉能有效固定化脲酶，是一种高效的固定化酶载体

This paper deals with the immobilization and properties of urease on enzymic dialdehyde starch. SEM results show that, as a carrier, enzymic dialdehyde starch aggregates after the immobilization. Moreover, it is found that （ 1 ） the content of urease immobilized on enzymic dialdehyde starch is up to 24.3 % ; （2） the optimal pH value and temperature for the immobilization are respectively 6. 0 and 70 ℃ ; （3） the immobilized urease is of excellent storage stability and large Michaelis constant; and （4） the activity of immobilized urease decreases only by 25% after being used for ten times. It is thus concluded that enzymic dialdehyde starch is an effective cartier for immobilized enzymes such as urease.