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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: J Biomed Mater Res A. 2013 Jun 24;102(5):1467–1477. doi: 10.1002/jbm.a.34821

Figure 3.

Figure 3

FTIR spectroscopy data for the reaction of glycerol and citric acid ([glycerol]:[citric acid] =1.4) at 110°C showing the carbonyl region for citric acid, product after 10 min, and product after 150 min as the ester absorbance at 1724 cm-1 becomes more pronounced.