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Phosphorylcholine Coating of Iron Oxide Nanoparticles

✍ Scribed by Benoı̂t Denizot; Gisèle Tanguy; François Hindre; Elmar Rump; Jean Jacques Le Jeune; Pierre Jallet

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
235 KB
Volume
209
Category
Article
ISSN
0021-9797

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✦ Synopsis

In order to develop thin-walled superparamagnetic nanoparticle suspensions as a contrast agent for magnetic resonance imaging, phosphorylcholine PC was used to coat iron oxide cores of 5 nm. Weak stable positively charged suspensions can be obtained at concentration greater than 3 mmol.l-1 (corresponding to about 3.2 molecules per nm2), while the addition of phosphorylglycerol PG decreases the electrophoretic mobility. Raising the pH over 6 leads to flocculation: the binding of PC on iron oxides as a function of pH appears to be reversible. By Langmuir analysis, two adsorption domains may be observed with a maximal density of 3.48 and 6.55 mol.nm-2, interpreted as a multilayer formation. Copyright 1999 Academic Press.

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