详细信息

明胶改性双孔块状SiO_2载体材料及其酶活力    

Gelatin Modified SiO_2 Monolith with Double-pore Structure for Enzyme Immobilization

文献类型:期刊文献

中文题名:明胶改性双孔块状SiO_2载体材料及其酶活力

英文题名:Gelatin Modified SiO_2 Monolith with Double-pore Structure for Enzyme Immobilization

作者:陈玉玲[1];陈奇[1,2];叶蕊芳[3];宋鹂[2];张金朝[2];候凤珍[2]

机构:[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237;[2]华东理工大学无机材料系,上海200237;[3]华东理工大学生物反应器工程国家重点实验室,上海200237

年份:2011

卷号:52

期号:2

起止页码:65

中文期刊名:化学世界

外文期刊名:Chemical World

收录:北大核心:【北大核心2008】;CSCD:【CSCD2011_2012】;

语种:中文

中文关键词:双孔;明胶改性;固定化酶;酶活性

外文关键词:double-pore; gelatin modification; immobilizing enzyme; enzyme activity

摘要:采用溶胶-凝胶法,以正硅酸乙酯为硅源,PEG为价孔造孔剂,50~100 nm的聚苯乙烯为大孔造孔剂,制得具有双孔结构的SiO2块体材料。制得的块体用不同相对分子质量明胶溶液对其进行表面改性,并通过吸附法将葡萄糖淀粉酶进行固定化。经过明胶改性后,固定化酶的初酶活力回收率由未改性的62.8%分别提高到84.1%(高分子量明胶)和86.7%(低分子量明胶)。连续使用5次后,低的相对分子质量明胶改性后块体固定化酶的相对活性仍达到76.6%。
SiO2 monoliths with double-pore structure were synthesized using tetraethyl orthosilicate(TEOS) as starting material,polyethylene glycol(PEG) as mesopore-making agent and polystyrene(PS) as marcopore-making agent via sol-gel route.High-(H-gelatin) and low-molecular weight gelatin(L-gelatin) were tethered on SiO2 monoliths for glucoamylase immobilization.Glucoamylase initial activities increased to 84.1% on H-gelatin modified SiO2 monoliths and 86.7% on L-gelatin modified SiO2 monoliths,respectively,comparing with 62.8% of enzyme directly immobilized on SiO2 monoliths.Continuously used for 5 times,the relative activity of enzyme immobilized on L-gelatin modified SiO2 monoliths still reached 76.6%.

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