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. Author manuscript; available in PMC: 2010 Apr 7.
Published in final edited form as: Nano Res. 2009 Jun 1;2(6):500–508. doi: 10.1007/s12274-009-9046-3

Figure 3.

Figure 3

(a) Comparison of fluorescence signals between traditional amphiphilic PEG-coated QDs and proton-resistant QDs in simulated gastric fluids. Under similarly acidic conditions, QDs coated with traditional amphiphilic polymers (octylamine-modified polyacrylic acid) are both quenched and precipitated. (b) Absorbance and fluorescence spectra of proton-resistant QD at different etching times. Notice that there is no blue-shift to either absorbance or fluorescence and that > 50% of the fluorescence intensity remains at 60 min.