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. Author manuscript; available in PMC: 2015 Jan 28.
Published in final edited form as: J Control Release. 2013 Nov 12;174:88–97. doi: 10.1016/j.jconrel.2013.11.003

Fig 1.

Fig 1

TPT excitation spectra at varying pH (3.50, 4.50, 5.50, 6.00, 6.27, 6.50, 6.80, 7.10, and 7.50) obtained at an emission wavelength of 560 nm. As pH is increased, a red shift occurs with maximum excitation shifting from 380 nm to 410 nm.