A New PEG-Lipid Conjugate Micelle for Encapsulation of CdSe/ZnS Quantum Dots
A new polymer conjugate of poly(ethylene glycol) (PEG) and 10,12-pentacosadiynoic acid (PCDA), PEG-PCDA conjugate, was synthesized by coupling reaction between carboxyl group of PCDA and hydroxyl group of PEG. Luminescent CdSe/ZnS QDs were encapsulated in the polymer micelles of mixtures of PEG-PCDA and PCDA using solid dispersion method to prepare water-soluble and biocompatible QD micelles. Upon UV-irradiation, the core of QD micelles was further stabilized by intramicellar crosslinking between neighboring PCDA moieties. The polymer conjugate was characterized by 1H-NMR, FT-IR, and GPC measurements, and thereof QD micelles observed using transmission electron microscopy (TEM) and dynamic light scattering (DLS). The QD micelles were spherical with diameters in the range of 30–190 nm. The encapsulated QDs in polymer micelles are water-soluble and have the high potential for applications in biomedical imaging and detection due to their good colloidal stability and biocompatible surface.
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Document Type: Research Article
Publication date: 2010-05-01
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