Table 2.
Functional groups and bonding patterns in the methanolic, ethanolic, and hexane extracts of Enteromorpha intestinalis as determined by FT-IR analysis.
| Extract | Peak Value (cm−1) | Functional Group | Bonding Pattern |
|---|---|---|---|
| MEEI | 3726.47 | Alcohol (free) | O-H stretching |
| 2920.23 | Alkane | C-H stretching | |
| 2850.79 | Alkane | C-H stretching | |
| 2358.94 | Carbon dioxide | O=C=O | |
| 1743.65 | Esters (6-membered lactone) | C=O stretching | |
| 1031.92 | Sulfoxide | S=O stretching | |
| 669.30 | Halo compound | C-Br | |
| EEEI | 3354.21 | Alcohol (intermolecular bond) | O-H stretching |
| 2922.16 | Alkane | C-H stretching | |
| 2850.79 | Alkane | C-H stretching | |
| 2358.94 | Carbon dioxide | O=C=O | |
| 1643.35 | Alkene (cis-disubstituted) | C=C stretching | |
| 1045.42 | Sulfoxide | S=O stretching | |
| 667.37 | Halo compound | C-Br | |
| HEEI | 3726.47 | Alcohol (free) | O-H stretching |
| 2922.16 | Alkane | C-H stretching | |
| 2852.72 | Alkane | C-H stretching | |
| 2358.94 | Carbon dioxide | O=C=O | |
| 1710.86 | Conjugated acid | C=O stretching | |
| 1462.04 | Sulfate | S=O stretching | |
| 1259.52 | Alkyl aryl ether | C-O stretching | |
| 750.31 | Monosubstituted | C-H bending | |
| 669.30 | Halo compound | C-Br |