Tan XC, Zhang JL, Tan SW, Zhao DD, Huang ZW, Mi Y, Huang ZY. Amperometric hydrogen peroxide biosensor based on immobilization of hemoglobin on a glassy carbon electrode modified with fe(3)o(4)/chitosan core-shell microspheres.
SENSORS 2009;
9:6185-99. [PMID:
22454579 PMCID:
PMC3312438 DOI:
10.3390/s90806185]
[Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 07/23/2009] [Accepted: 08/03/2009] [Indexed: 11/25/2022]
Abstract
Novel magnetic Fe3O4/chitosan (CS) microspheres were prepared using magnetic Fe3O4 nanoparticles and the natural macromolecule chitosan. Then, using an easy and effective hemoglobin (Hb) immobilization method, an innovative biosensor with a Fe3O4/CS-Hb-Fe3O4/CS “sandwich” configuration was constructed. This biosensor had a fast (less than 10 s) response to H2O2 and excellent linear relationships were obtained in the concentration range of 5.0 × 10−5 to 1.8 × 10−3 M and 1.8 × 10−3 to 6.8 × 10−3 M with a detection limit of 4.0 × 10−6 M (s/n = 3) under the optimum conditions. The apparent Michaelis-Menten constant Km was 0.29 mM and it showed the excellent biological activity of the fixed Hb. Moreover, the biosensor had long-time stability and good reproducibility. The method was used to determine H2O2 concentration in real samples.
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