Figure 4: a). 1H-NMR (CD3OD) of Qdots, OCT and Qdots-OCT. Peak I at 2.5 - 2.8 ppm is corresponding to succinate moieties. PEG protons were detected in the region of peak II at 3.4 - 3.8 ppm before and after conjugation with OCT. The aromatic peaks at 7.00 - 7.50 ppm, peak III were used as indicator for the presence of OCT conjugated to Qdots. b). SEC chromatograms of OCT, unmodified and modified Qdot NPs using UV detection at 280 nm. The wavelength of the UV detection was 280 nm so that the elution peak of both the Qdots and OCT could be detected.