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Avidin: A Natural Bridge for Quantum Dot-Antibody Conjugates
Abstract
We describe the preparation and characterization of bioinorganic conjugates in which luminescent semiconductor CdSe-ZnS core-shell nanocrystal quantum dots (QDs) were coupled to antibodies through the use of an avidin bridge adsorbed to the nanocrystal surface via electrostatic self-assembly. Avidin, a highly positively charged protein, was found to adsorb tightly to QDs modified with dihydrolipoic acid, which gives their surface a homogeneous negative charge. QD conjugation to biotinylated antibodies subsequently is readily achieved. Fluoroimmunoassays utilizing these antibody conjugated QDs were successful in the detection of protein toxins (staphylococcal enterotoxin B, cholera toxin). QD-antibody conjugates formed in such a facile manner permit their use as a common immuno reagent, and in the development of multianalyte detection.
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Metadata
- Authors
- Goldman, E. R., Balighian, E. D., Mattoussi, H., Kuno, M. K., Mauro, J. M., Tran, P. T., & Anderson, G. P.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-05-11
- Volume
- 124
- Issue
- 22
- Pages
- 6378-6382
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1980991166
- Cited by
- 518
- References
- 1
- FWCI
- 25.50
- Type
- journal article
- Language
- en
- Open access
- closed
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