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. Author manuscript; available in PMC: 2014 Oct 2.
Published in final edited form as: Small. 2011 Apr 20;7(10):1432–1439. doi: 10.1002/smll.201002274

Figure 3.

Figure 3

UV spectroscopy of ATRA. NDI-ATRA in PBS (black line) displays a normal ATRA absorption spectrum with peak between 341-350 nm. NDI in PBS alone (green line) has no spectral properties while the DMPC/DMPG-ATRA control in PBS (yellow line) did not retain significant levels of ATRA following excess lipid/drug centrifugation and sterile filtration. An equal concentration of ATRA in ethanol (red line) has a similar spectrum as NDI-ATRA in PBS. However, the spectrum for ATRA in PBS (blue line) is mostly attenuated.