Enhanced lysozyme imprinting over nanoparticles functionalized with carboxyl groups for noncovalent template sorption.
Surface molecular imprinting, in particular over nanosized support materials, is very suitable for a template of bulky structure like protein. Inspired by the surface template immobilization method reported previously, we herein demonstrate an alternative strategy for enhancing specific recognition of core-shell protein-imprinted nanoparticles through prefunctionalizing the cores with noncovalent template sorption groups. For proof of this concept, silica nanoparticles chosen as the core materials were modified consecutively with 3-aminopropyltrimethoxysilane and maleic anhydride to introduce polymerizable double bonds and terminal carboxyl groups, hence capable of physically adsorbing the print protein. With lysozyme as a template, thin protein-imprinted shells were fabricated according to our newly developed approach for surface protein imprinting over nanoparticles. The rebinding experiments confirmed that the introduction of the carboxyl groups could remarkably improve the imprinting effect in relation to a significantly increased imprinting factor and specific rebinding capacity. Moreover, in contrast to the harsh template removal conditions required for the covalent template coupling approach, the template removal during the imprinted particle synthesis as well as desorption after rebinding could be mildly achieved via washing with salt solution.
Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, People's Republic of China. gqfu@nankai.edu.cn
Guoqi
G
Fu
Hongyan
H
He
Zhihua
Z
Chai
Huachang
H
Chen
Juan
J
Kong
Yan
Y
Wang
Yizhe
Y
Jiang
D007700:Kinetics; D046529:Microscopy, Electron, Transmission; D054802:Molecular Imprinting / Q000379:methods*; D009113:Muramidase / Q000737:chemistry* / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry*; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry; D055672:Static Electricity; D013379:Substrate Specificity; D013818:Thermogravimetry
D012822:Silicon Dioxide; D009113:Muramidase