Abstract：
:Papain enzyme was successfully immobilized by covalent bonding onto biocompatible Fe3O4/SF nanoparticles, which were prepared with the soft template of silk fibroin (SF). The optimized immobilization condition is pH6.0, hydrolysis time of 60min, and an enzyme/support ratio of 10.0mg/g. Compared with free papain, the immobilized papain exhibits a high effective activity, broader working pH and temperature. This immobilized papain can be separated from the solution by the external magnetic field for cyclic utilization, and 70% of initial activity was retained after eight consecutive operations while completely loss of proteolytic activity for the free papain. Furthermore, the immobilized papain maintained 85% of their initial activity after being stored for 28days. Kinetic parameters, maximum reaction rate (Vmax) and Michaelis constant (Km) of immobilized papain, were determined as 4.95mg/l·min and 0.23mg/ml, larger than its free counterpart. All the results above indicated that the immobilized papain onto magnetic Fe3O4/SF nanoparticles would have potential industrial and medical applications.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Sheng W,Xi Y,Zhang L,Ye T,Zhao Xdoi
10.1016/j.ijbiomac.2018.03.088subject
Has Abstractpub_date
2018-07-15 00:00:00pages
143-148eissn
0141-8130issn
1879-0003pii
S0141-8130(18)30608-1journal_volume
114pub_type
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