Table 1 FTIR wavenumber and allocated functional groups of reported tannins, BDTF, PDTF and tannic acid standard (ST)
From: Anti-dengue virus serotype 2 activity of tannins from porcupine dates
No. | Functional group | Wavenumber (cm−1) | |||
|---|---|---|---|---|---|
Tanninsa | BDTF | PDTF | Tannic acid (ST) | ||
1 | OH | 3356 | 3339 | 3340 | 3307 |
2 | C–H | 2725 | 2926; 2972 | 2929; 2972 | 2980 |
3 | C=O (ester) | 1718 | 1704 | 1705 | 1700 |
4 | C–Carom | 1614; 1452 | 1608; 1445 | 1608; 1446 | 1607; 1445 |
5 | C–O | 1191 | 1193 | 1192 | 1187 |
6 | Carom–H (out of plane bending) | 754 | 756 | 757 | 754 |