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Position: Home > Articles > Preparation of Encapsulation-crosslinked Aggregates of Phospholipase A_1 FOOD SCIENCE 2012,33 (5) 118-123

包埋-交联磷脂酶A_1聚集体的制备及酶学性质

作  者:
王妍;王雪;李越;李志平;于殿宇
单  位:
东北农业大学食品学院
关键词:
磷脂酶A1;沉淀剂;戊二醛;交联酶聚集体;固定化;包埋;扫描电镜(SEM)
摘  要:
为得到可重复使用且活力较高的固定化磷脂酶A1,采用包埋-交联酶聚集体的方法对磷脂酶A1进行固定,对固定化条件和部分酶学特性进行优化和研究,确定最佳条件为:酶液质量浓度0.06g/mL、沉淀剂饱和度80%、沉淀pH6、沉淀时间35min、戊二醛体积分数0.4%、交联时间6.5h、海藻酸钠质量分数2%、Ca2+浓度0.25mol/L。得到包埋-交联磷脂酶聚集体A1的酶活回收率为80.2%。固定化酶热稳定性增强,重复使用7次相对酶活力保留在6 5%以上。
译  名:
Preparation of Encapsulation-crosslinked Aggregates of Phospholipase A_1
作  者:
WANG Yan,WANG Xue,LI Yue,LI Zhi-ping,YU Dian-yu(College of Food Science,Northeast Agricultual University,Harbin 150030,China)
关键词:
phospholipase A1;precipitan;glutaraldehyde;cross-linked enzyme aggregates(CLEAs);immobilization;encapsulation;SEM
摘  要:
In order to prepare reusable immobilized phospholipase A1with high activity,the encapsulation-crosslinked aggregate method was used.The immobilization conditions and partial properties of immobilized phospholipase were determined.Results indicated that the optimal preparation conditions were enzyme concentration of 0.06 g/mL,precipitant saturation degree of 80%,precipitation time of 35 min,glutaradehyde concentration of 0.4%,cross-linking time of 6.5 h,sodium alginate concentration of 0.2% and Ca2+concentration of 0.25 mol/L.Under the optimal preparation conditions,the recovery rate of enzyme activity was 80.2%.The thermal stability of immobilized phospholipase was better than that of free phospholipase.Meanwhile,after seventh repeated use,the relative activity of immobilized phospholipase still remained more than 65%.

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