Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 58, Issue 4, Pages 457-462Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.201190006
Keywords
Substance P; Rat spinal cord samples; Iron oxide nanoparticles; MALDI/MS
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Funding
- National Science Council of Taiwan [NSC 97-2113-M-029-008-MY2]
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Functionalized iron oxide nanoparticles (IONPs) were used as concentrating probes to extract substance P (SP) from aqueous solution before matrix-assisted laser desorption/ionization mass spectrometric (MALDI/MS) analysis. Adsorption of SP onto the nanoparticles was mainly due to electrostatic interaction. After simple washing, the SP-adsorbed nanoparticles were directly analyzed by MALDI/MS. With this concentration strategy, the limit of detection (LOD) of SP in 500 mu L buffer solution (pH 8) was 0.1 nM. In addition, the nanoparticles could isolate SP from a solution with high contents of salts and surfactants, thus alleviating suppression effect during MALDI/MS analysis. This new method was successfully applied to the determination of SP in rat spinal cord samples. The LOD and recovery of SP in a rat spinal cord sample were 3.1 nM and 85.7%, respectively.
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