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%.
出处
《化学世界》
CAS
CSCD
北大核心
2011年第2期65-68,73,共5页
Chemical World
关键词
双孔
明胶改性
固定化酶
酶活性
double-pore
gelatin modification
immobilizing enzyme
enzyme activity
作者简介
陈玉玲(1985-),女,河北人,硕士,主要从事多孔陶瓷生物酶载体材料的合成及改性。E-mail:chenyuling23@gmail.com
联系人:E-mail:qichen@ecust.edu.cn