Microchimica Acta

, Volume 164, Issue 1–2, pp 93–99

A novel mimetic peroxidase catalyst by using magnetite-containing silica nanoparticles as carriers

Original Paper

Abstract

A method for coating magnetite and mimetic enzyme (hemin) with amorphous silica to form a novel mimetic peroxidase (magnetite–hemin/SiO2) has been developed by combining reverse microemulsion and the modified Stöber method. The magnetic silica nanoparticle supported hemin has a long-term stability toward temperature and good reusability. They can be easily separated from the reaction solution by using an external magnetic field and reused directly for next round of reaction. The peroxidase activity of the magnetite–hemin/SiO2 was studied based on its catalytic effect on the reaction of p-hydroxyphenylacetic acid and H2O2. The results indicated that the catalytic activity of the new mimetic enzyme catalyst is higher than that of the free hemin. The possibility of its application was proven by the determination of H2O2, with the detection limits of 7.3 nmol L−1 H2O2.

Keywords

Mimetic enzyme Magnetic Magnetite–hemin/SiO2 nanoparticles Fluorescence 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen UniversityXiamenPeople’s Republic of China

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