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• W2000873312 abstract "An easily replaceable microchip enzymatic microreactor has been fabricated based on the glass microchip with trypsin-immobilized superparamagnetic nanoparticles. Magnetic nanoparticles with small size (50 nm in diameter) and strong magnetism were synthesized. At first, amine-functionalized magnetic nanoparticles with high magnetic responsivity and excellent dispersibility were prepared through a facile one-pot strategy. Then, magnetic nanoparticles were functionalized with numerous aldehyde (–CHO) groups by treating the as-synthesized, amine-functionalized magnetic nanoparticles with glutaraldehyde. Finally, immobilization of trypsin onto the aldehyde-functionalized magnetic nanoparticles was achieved through reaction of the aldehyde groups with amine groups of trypsin. The prepared magnetic nanoparticles were then locally packed onto the glass microchip by the application of a strong magnetic field using a magnet to form an on-chip magnetic nanoparticles packing bed. Capability of the proteolytic microreactor was demonstrated by cytochrome c, bovine serum albumin and myoglobin as model proteins. The digestion products were characterized using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry with sequence coverage of 83%, 43% and 79% observed, respectively. Complete protein digestion was achieved in a short time (10 s) under the flow rate of 5 μL/min. These results are expected to open up a new possibility for the proteolysis analysis as well as a new application of magnetic nanoparticles. It is easy to replace the nanoparticles and make the new microreactor. It takes less than 1 min under the condition of extra magnetic to form a new packing bed. The packing bed can be used for at least five times without any treatments. Additionally, since the preparation and surface functionality of magnetic nanoparticles is low-cost and reproducible, the preparation method and application approach of the magnetic nanoparticles may find much potential in proteome research. This microreactor was also successfully applied to the analysis of an RPLC fraction of the rat liver extract. After a database search, six proteins were identified. This opens a route for its further application in bottom-up proteomic analysis." @default.
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• W2000873312 date "2007-12-01" @default.
• W2000873312 modified "2023-09-25" @default.
• W2000873312 title "On-chip enzymatic microreactor using trypsin-immobilized superparamagnetic nanoparticles for highly efficient proteolysis" @default.
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• W2000873312 doi "https://doi.org/10.1016/j.chroma.2007.10.094" @default.
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