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. 2022 Feb 4;23(3):1792. doi: 10.3390/ijms23031792

Table 2.

Summary of observed FT-IR absorption frequencies in cm−1.

Vibration a PAA GlcN PAA-UGON GlcN-PAA-UGON Ref
(C-O) s - 1026 - 1060 [30,45,46]
(C-N) s - 1415 - 1401 [45]
(COO-) ss - - 1401 1401 [30,45]
(COO-) as - - 1538 1538 [30,45]
(N-H) b - 1540 - 1538 [46]
(C=O) s 1700 - - - [30]
(C-H) s 2957 2940 2945 2945 [30,45,46]
(N-H) s - 3283 - ~3319 [45,46,47]
(O-H) s - 3346 ~3319 ~3319 [45,46,47]

a Subscripts as, ss, s, and b indicate asymmetric stretching, symmetric stretching, stretching, and bending, respectively.