Wave number ( cm–1) Functional group 1753 cm–1 (C=O stretching) 1451 cm–1 (C-H stretching) 3423 cm–1 (O-H stretching) 1180 cm–1 C-C(O)-C stretching 1080 cm–1 (C-O stretching)

Table 1: Wave number and functional group present in the pla scaffolds