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. Author manuscript; available in PMC: 2017 Apr 10.
Published in final edited form as: Bioconjug Chem. 2015 Aug 11;26(8):1766–1774. doi: 10.1021/acs.bioconjchem.5b00313

Figure 2.

Figure 2

ATR-FTIR shows incorporation of quaternary ammonium group in cESG A) ATR-FTIR spectra of ESG, cESG synthesized at 1:10 ratio (AGU:GTMA), and GTMA, where the peak at 1475 cm−1 in cESG is assigned to C-H stretching of methyl groups on the quaternary amine. See Figure S2 for additional cESG peak assignments. B) Zoomed in overlay spectra of the products from various AGU:GTMA ratios. The incorporation a quaternary amine, as indicated by the 1475 cm−1 peak, is clearly seen for the 1:10 and 1:5 samples.