Table 9 FTIR analysis of cottonseeds, oil, and Methyl ester (COME) showing functional group changes during transesterification.
Wave Number (cm⁻¹) | Vibration type | Functional group | Sample identified in |
|---|---|---|---|
3637.148 | O–H stretch | –OH | Cottonseed powder (CS) |
1409.33 | C–H bending | –CH₃, –CH₂– | Cottonseed powder (CS) |
588.002 | C–C bending | –C–C– | Cottonseed Powder (CS) |
2933.246 | C–H stretch | –CH₃, –CH₂– | Cottonseed oil (CSO) |
1743.364 | C = O stretch | –C(= O)–O– (Ester) | Cottonseed oil (CSO) |
1174.456 | C–O stretch | –C–O–C– | Cottonseed oil (CSO) |
705.83 | =C–H bending | > C = CH₂, –CH = CH– | Cottonseed oil (CSO) |
2913.916 | C–H stretch | –CH₃, –CH₂– | Cottonseed oil methyl ester (COME) |
1741.434 | C = O stretch | –C(= O)–O– (Ester) | Cottonseed oil methyl ester (COME) |
1159.089 | C–O–C stretch | –C–O–C– | Cottonseed oil methyl ester (COME) |
705.83 | =C–H bending | > C = CH₂, –CH = CH– | Cottonseed oil methyl ester (COME) |
