Table 2.
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.