Nano polyurethane-assisted ultrasensitive biodetection of H(2)O(2) over immobilized microperoxidase-11 |
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Authors: | Chen Zhenping Sun Dongmei Zhou Yiming Zhao Jiayue Lu Tianhong Huang Xiaohua Cai Chenxin Shen Jian |
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Institution: | Jiangsu Key Laboratory of New Power Batteries, Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210046, PR China. |
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Abstract: | Nanostructured polyurethane (PU) synthesized by an emulsion polymerization with narrow size distribution was employed for the first time directly as a novel matrix for enzyme immobilization to develop sensitively amperometric biosensors. When Microperoxidase-11 (MP-11) was selected as a model protein, the resulting hydrogen peroxide (H(2)O(2)) biosensor exhibited improved sensitivity of 29.6μAmM(-1)cm(-2) with quite good response time of (1.3±0.4)s and remarkable limit of detection as low as 10pM (S/N 3) over existing protocols. A linear calibration curve for hydrogen peroxide was obtained up to 1.3μM under the optimized conditions with a relative low calculated Michaelis-Menten constant (K(M)(app)) (1.87±0.05)μM, which indicated the enhanced enzymatic affinity of MP-11 to H(2)O(2) via PU. The possible interferents had negligible effect on the response current and time of the prepared biosensor. Results suggest that the PU nanoparticles (PU-NPs) with good biocompatibility and sufficient interfacial adhesion hold promise as an attractive support material for construction of ultrasensitive amperometric biosensor. |
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