Table 2 Selected FTIR absorption peaks for PLA [14,15,16,17,18,19,20,21,22,23,24] and paclitaxel [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]
From: Fabrication of polylactic acid/paclitaxel nano fibers by electrospinning for cancer therapeutics
| Wavenumber (cm−1) | Mode |
|---|---|
| PLA | |
| 616 | COO–bend |
| 806 | COO–(out-of-plane) |
| 973 | C–N stretching |
| 1022 | –CH2 (out-of-plane) |
| 1090 | C–O stretching |
| 1183 | –C–O–C– |
| 1224 | –C–O–H– |
| 1305 | C–H (out-of-plane) |
| 1339 | C–H bending |
| 1434 | COO–symmetric stretching |
| 1470 | –CH2 bending |
| 1601 | COO–asymmetric stretching |
| 1746 | C=O stretching |
| 2905 | C–H stretching |
| 2956 | –CH2 symmetric stretching |
| 3004 | –CH2 asymmetric stretching |
| 3568 | OH (COOH) |
| 3572 | OH (COOH) |
| Paclitaxel | |
| 689 | C–H out-of-plane/C–C=O deformation |
| 803–941 | C–H in-plane deformation |
| 941–803 | C–H in-plane deformation |
| 1049–1090 | C–O stretching |
| 1112–1117 | O–H in-plane bending in (COOH) |
| 1274 | C–N stretching |
| 1330–1380 | CH3 deformation |
| 1369 | CH/NH bend |
| 1444 | C=C ring stretching |
| 1579–1652 | C–C stretching |
| 1640 | N–H bending |
| 1733 | (C=O stretching) of amide group |
| 1775 | C=O |
| 1777 | C=O |
| 2541–2973 | CH3/C–H stretching |
| 2860 | CH |
| 2909 | CH stretch |
| 3066 | –CH sp3 stretching |
| 3339 | N–H/O–H stretching |
| 3568 | OH (COOH) |
| 3572 | OH (COOH) |