NDLI: Photoluminescence and photostability investigations of biocompatible semiconductor nanocrystals coated with glutathione using low laser power

Content Provider	Springer Nature Link
Author	Ibrahim, Salwa Ali Ahmed, Wafaa Youssef, Tareq
Copyright Year	2014
Abstract	Great efforts are currently devoted to fabricate high-quality quantum dots (QDs) in aqueous solutions for biomedical applications. Two biocompatible systems consisting of core (CdSe) and core/shell (CdSe/ZnS) QDs surface modified with glutathione (GSH), named CdSe-GSH and CdSe/ZnS-GSH, respectively, were built. Upon photoirradiation using low laser power, both systems in HEPES buffer (pH 7.2) showed significant photoluminescence (PL) enhancements. CdSe/ZnS-GSH showed much less blue shifts in excitonic absorption and emission peaks without photobleaching compared with CdSe-GSH QDs system. X-ray diffraction showed that there is no change in the crystalline phase structure of the CdSe/ZnS-GSH QDs system after 1 h irradiation. Cell viability assessment, in the dark, demonstrated that no cytotoxic effects were shown upon incubation CdSe/ZnS-GSH QDs with normal human skin cell line for periods up to 72 h and at concentrations up to 100 nM. The present study demonstrates that CdSe/ZnS-GSH QDs system exhibits a high photostability with a relatively high PL efficiency in aqueous medium following low intensity photoexcitation, without dark cytotoxicity, making this system attractive for several important biomedical applications.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	16
Issue Number	6
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-05-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanotechnology Quantum dots Glutathione Laser Photoluminescence Photostability Cytotoxicity Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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