Yong YANG, Xiao-qing DONG, Lei ZHANG, Jin CHANG. Preparation and Characterization of Quantum Dots-tagged Self-assembly Nanoparticles[J]. Polymer Bulletin, 2007,20(6):38-44.
Various cholic acid modified lysine grafted chitosan(CA-LysCS) with the same degrees of substitute (DS) of cholic acid (4∙2%) and different degrees of substitute (DS) of Lysine(2∙3%
4∙7%
9∙3%) were synthesized with the EOC as the coupling reagent.Structural characteristics of these products were investigated using FT-IR and
1
HNMR.The critical aggregation concentration(CAC) of the self-aggregate of CA-LysCS were determined by measuring the fluorescence intensity of the pyrene as a fluorescent probe
which increased with increase of DS of Lysine in the range of 1∙1~5∙3×10
-2
mg/mL.The average particle size of self-aggregates in distilled water also increased with the increase of the DS of Lysine in the range of 164∙6~414∙3nm.These self-assembly nanoparticles were tagged using TOPO-capped green quantum dots (QDs).A transmission electron microscopy study showed that the quantum dots located in the hydrophobic core of the micelles.The flurescence intensity of green Quantum dots decreased after encapsulated mainly due to the covering of the micelles.