Table 6.
1H nuclear magnetic resonance (NMR) data of colorectal cancer (CRC) biomarker pool (sample A) and their methyl esters
| Types of protons | CRC biomarker pool | Methyl esters of CRC biomarker pool |
|---|---|---|
| CH3 | 0.83-0.90 | 0.83-0.90 |
| CH2 | 1.21-1.24, m | 1.21-1.24, m |
| -CH2CH2COOH | 1.57-1.65, m | 1.53-1.69, m |
| -CH2CH=CH- | 1.98-2.08, m | 1.94-2.03, m |
| CH2COO | 2.23-2.28, m | 2.23-2.31, m |
| -CH=CH-CH2-CH= | 2.75-2.79, m | 2.74-2.82, m |
| OCH3 | - | 3.64, s |
| -CH(OH)CH= | 3.45-3.71, 4.03-4.26 | 4.02-4.12, 4.16-4.26, 4.58-4.60 |
| -CH= | 5.10-5.47, m | 5.08-5.40, m |
| -CH(OH)CH= | 5.76-5.91, m | 5.75-5.90, m |
*NMR solvent is CDCl3, signals assigned using 2D NMR experiments (HMQC and HMBC)