Journal
LANGMUIR
Volume 26, Issue 2, Pages 1278-1284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la9024553
Keywords
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Funding
- National Science Foundation of China [20875011, 20635010]
- Education Committee of Liaoning Province of China
- U.S. National Science Foundation
- National Institutes of Health
- Department of Defense Congressionally Directed Medical Research Programs
- Oklahoma Center for the Advancement of Science and Technology
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [847758] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0854465, 0854414] Funding Source: National Science Foundation
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The synthesis of a new kind of magnetic, fluorescent multifunctional nanoparticles (similar to 30 nm in diameter) was demonstrated, where multiple fluorescent CdTe quantum dots (QDs) are covalently linked to and assembled around individual silica-coated superparamagnetic Fe3O4 nanoparticles and active carboxylic groups are presented on the surface for easy bioconjugation with biomolecules. The Fe3O4 nanoparticles were first functionalized with thiol groups, followed by chemical conjugation with multiple thioglycolic acid modified CdTe QDs to form water-soluble Fe3O4/CdTe magnetic/fluorescent nanocomposites. diffraction, infrared spectroscopy, transmission electron microscopy, absorption and fluorescence spectroscopy, and magnetometry were applied to fully characterize the multifunctional nanocomposites. The nanocomposites were found to exhibit magnetic and fluorescent properties favorable for their applications in magnetic separation and guiding as well as fluorescent imaging. The carboxyl groups on the nanocomposite surface were proved to be chemically active and readily available for further bioconjugation with biomolecules such its bovine serum albumin and antibodies, enabling the applications of the nanocomposites for specific recognition of biological targets. The Fe3O4/CdTe magnetic/fluorescent nanocomposites conjugated with anti-CEACAM8 antibody were successfully employed for immuno-labeling and fluorescent imaging of HeLa cells.
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