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. Author manuscript; available in PMC: 2010 Dec 16.
Published in final edited form as: J Control Release. 2009 May 22;140(3):203–209. doi: 10.1016/j.jconrel.2009.05.021

Figure 2.

Figure 2

Characterization of cyclic and linear polymers. (A) 1HNMR spectra of linear APtBA-Br (2), linear APtBA-N3 (3) and cyclic PtBA (5). The hydrogens a – e and numbers 2, 3 and 5 are corresponding to the hydrogens and polymers in scheme 1, respectively. (B) The retention volume of linear (3, black) and cyclic (5, green) PtBA measured by GPC in THF. Numbers 2, 3 and 5 are corresponding to the polymers in Figure 1. (C) Linear polyacrylic acid (APAA-N3) and cyclic PAA characterized by matrix assisted laser desorption time-of-flight mass spectrometry (MALDI-TOF MS)