title: Photodynamic therapy potential of thiol-stabilized CdTe quantum dot-group 3A phthalocyanine conjugates (QD-Pc).
abstract: Thiol stabilized CdTe quantum dot (QD) nanoparticles were synthesized in aqueous phase and were used as energy donors to tetra-triethyleneoxythia substituted aluminum, gallium and indium phthalocyanines through fluorescence resonance energy transfer (FRET). Energy transfer occurred from the QDs to phthalocyanines upon photoexcitation of the QDs. An enhancement in efficiency of energy transfer with the nature of the carboxylic thiol stabilizer on the QDs was observed. As a result of the nanoparticle and the phthalocyanine mixing, the photoluminescence efficiency of the phthalocyanine moieties in the mixtures does not strictly follow the quantum yields of the bare phthalocyanines. The photochemistry study of phthalocyanines in the presence of the QDs revealed high singlet oxygen quantum yield, hence the possibility of using QDs in combination with phthalocyanines as photosensitizers in photodynamic therapy of cancer. The fluorescence of the CdTe quantum dots-phthalocyanine conjugates (QDs-Pc) were effectively quenched by addition of 1,4-benzoquinone.
authors.affiliation: Gebze Institute of Technology, Department of Chemistry, PO Box 141, Gebze 41400, Turkey.
authors.forename: Duygu Aydın
authors.initials: DA
authors.lastname: Tekdaş
authors.forename: Mahmut
authors.initials: M
authors.lastname: Durmuş
authors.forename: Hülya
authors.initials: H
authors.lastname: Yanık
authors.forename: Vefa
authors.initials: V
authors.lastname: Ahsen
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D017319:Photosensitizing Agents / Q000737:chemistry*; D045663:Quantum Dots; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D007211:Indoles; D054833:Isoindoles; D017319:Photosensitizing Agents; D013438:Sulfhydryl Compounds; D013691:Tellurium; C028337:cadmium telluride; C013647:phthalocyanine