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. 2015 Apr 14;5(3):270–276. doi: 10.1016/j.apsb.2015.03.008

Figure 4.

Figure 4

Optical path normalized image of different microspheres (MS1–MS3). (A) Carbonyl ester bond at 1750 cm−1 of PLGA; (B) CH2 wagging at 1450 cm−1 of PLGA; (C) amide I bond at 1656 cm−1; (D) amide II bond at 1545 cm−1.