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. 2021 Dec 22;23(1):443–453. doi: 10.1021/acs.biomac.1c01398

Table 3. Assignment of FT-IR Bands of HA.

wavenumber (cm–1) functional groups
3690
graphic file with name bm1c01398_m013.jpg
3390 phenolic −OH hydroxyl groups
2925 aliphatic C–H bands
1575 antisymmetric νCOO of carboxyl salt
1380 symmetric νCOO of carboxyl salt
1100 νCO (phenolic), νOH (aliphatic)
1040 νC–N
1005 νCO
910 out-of-phase δCH (aromatic)