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Superparamagnetic maghemite nanoparticles from solid-state synthesis – Their functionalization towards peroral MRI contrast agent and magnetic carrier for trypsin immobilization

Paper ID Volume ID Publish Year Pages File Format Full-Text
10080 663 2009 9 PDF Available
Title
Superparamagnetic maghemite nanoparticles from solid-state synthesis – Their functionalization towards peroral MRI contrast agent and magnetic carrier for trypsin immobilization
Abstract

Nearly monodispersed superparamagnetic maghemite nanoparticles (15–20 nm) were prepared by a one-step thermal decomposition of iron(II) acetate in air at 400 °C. The presented synthetic route is simple, cost effective and allows to prepare the high-quality superparamagnetic particles in a large scale. The as-prepared particles were exploited for the development of magnetic nanocomposites with the possible applicability in medicine and biochemistry. For the purposes of the MRI diagnostics, the maghemite particles were simply dispersed in the bentonite matrix. The resulting nanocomposite represents very effective and cheap oral negative contrast agent for MRI of the gastrointestinal tract and reveals excellent contrast properties, fully comparable with those obtained for commercial contrast material. The results of the clinical research of this maghemite–bentonite contrast agent for imaging of the small bowel are discussed. For biochemical applications, the primary functionalization of the prepared maghemite nanoparticles with chitosan was performed. In this way, a highly efficient magnetic carrier for protein immobilization was obtained as demonstrated by conjugating thermostable raffinose-modified trypsin (RMT) using glutaraldehyde. The covalent conjugation resulted in a further increase in trypsin thermostability (T50 = 61 °C) and elimination of its autolysis. Consequently, the immobilization of RMT allowed fast in-solution digestion of proteins and their identification by MALDI–TOF mass spectrometry.

Keywords
Maghemite; Solid-state synthesis; Abdomen MRI; Proteomics; Nanocomposites; Contrast agent
First Page Preview
Superparamagnetic maghemite nanoparticles from solid-state synthesis – Their functionalization towards peroral MRI contrast agent and magnetic carrier for trypsin immobilization
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 30, Issue 15, May 2009, Pages 2855–2863
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering