Journal of Analytical & Bioanalytical Techniques
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Great efforts are currently devoted to fabricate high-quality quantum dots (QDs) in aqueous solutions for biomedical
applications. Here, 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 (pH 7.2) showed significant photoluminescence 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 results for CdSe/ZnS-GSH QDs system suggest no new patterns are formed that could be assigned to a release of toxic
by-products following irradiation. This study demonstrates that CdSe/ZnS-GSH QDs system exhibits a high photostability with
relatively high luminescence efficiency in aqueous medium making this system attractive for several biomedical applications. An
analysis to the effects of low laser power on our system was proposed.
Tareq Youssef has completed his Ph.D. at the age 32 from Institute of Biophysics-Pisa/Italy and postdoctoral at the same Institute and Ecole
Normale Superiore-Paris/France. Now he is the head of Deptartment of Metreology, Photochemistry and Photobiology at National Institute of Laser
Enhanced Sciences, Cairo University He is a reviewer for some journals and published more than 20 international papers. He is involved in local and
international projects with Italy, France and Germany.
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