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RISS 인기검색어
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- 저자 : Scaiano, J.C. (검색결과 2 건)
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Fluorescence quenching of CdSe quantum dots by tertiary amines and their surface binding effect
Galian, Raquel E.,Scaiano, Juan C. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.1
The effect of different amines on the fluorescence of quantum dots has been discussed in the literature but the mechanism involved is not fully understood. We have studied the interaction of core CdSe quantum dots of different sizes and core-shell CdSe quantum dots with tertiary amines, such as aliphatic amines (triethylamine) and bicyclic amines (DABCO and quinuclidine), using fluorescence techniques. Fluorescence quantum yield decreases with increasing concentration of the amine following a linear Stern.Volmer behaviour ($K_q$ = 80-330 $M^{-1}$), but relatively small changes were observed in the fluorescence lifetimes. In order to get insights into the mechanism involved, small nanoparticles (2.1 nm) were synthesized and the interaction QD surface.amine was analysed by NMR and FTIR spectroscopy.
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Cucurbituril complexes cross the cell membrane
Montes-Navajas, Pedro,Gonzalez-Bejar, Maria,Scaiano, J.C.,Garcia, Hermenegildo Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.12
Cucurbiturils (CBs) of the appropriate size (CB[7] and CB[8]) form strong guest-host complexes in phosphate buffer solution (PBS) with acridine orange (AO) and pyronine Y (PYY) with 1 : 1 and 2 : 1 stoichiometries for CB[7] and CB[8] complexes, respectively. Binding constants in the range $0.87-1.60{\times}10^6M^{-1}$ and $5.2-6.3{\times}10^{13}M^{-2}$ were determined by titration with fluorescence spectroscopy for 1 : 1 and 2 : 1 complexes, respectively. These binding constants in PBS and the eight-fold excess of CBs minimize the presence of free dye in solution and also stabilize the host-guest complex in the culture medium. Images showing that the CB complexes can cross the cell membrane of 3T3 cells have been acquired using fluorescence microscopy. Given the current importance of supramolecular CB complexes and the search for new drug delivery systems, the present findings open avenues for the use of CBs as nanocapsules to transport drugs into the cells.
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