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Immobilization of enzymes on magnetic nanoparticles imparts them potentially unique properties.
In contrast to micrometer-sized particles, a highly specific surface area of the nanoparticles facilitates the immobilization of a larger amount of enzyme, which is accompanied by an increased specific enzyme activity.
The easy dispersibility of the nanoparticles also enables smooth contact
with the substrate alleviating mass-transfer limitations.
This lowers the detection limit and speeds up the analysis time.
Like in conventional polymer supports, various enzymes were immobilized via chemical bonds on coated or embedded magnetic nanoparticles.
The enzymes include glucoamylase ,cytochrome coxidase, b-lactamase , chymotrypsin, alcohol dehydrogenase ,glucose oxidase, galactose
oxidase, urease ,neuramidinase ,papain ,DNase ,RNase ,etc.
Enzymes immobilized on magnetic supports generally have higher thermal and storage stability facilitating repeated applications, but lower activity than free enzymes in solution.
Trypsin-immobilized magnetic polymer particles smaller than 1 lm can digest proteins in microchip (lchip) protease microreactor. This helps to elucidate prii mary structure of the proteins and their post-translation modification. A unique fingerprint for each protein palled a ¡°peptide map¡± can thus be obtained. Digestion
in l-chip immobilized magnetic enzyme reactor (IMER) using magnetic nano- and microparticles is a preferable alternative to the conventional batch mode for numerous large globular and highly glycosylated proteins .
On-line connection with mass spectrometer opens the route to automated, high-throughput proteomic devices, which significantly simplifies proteomic analysis protocols without compromising the quality and specificity of analysis.
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