Table 8 Untreated potato starch (UPS) wavenumbers portrayed in Raman analysis with corresponding functional groups compared to mechanically treated starch nanoparticles (MTSN-3 days and MTSN-6 days) absorption spectrum
UPS | MTSN-3 days | MTSN-6 days | Â | |||
|---|---|---|---|---|---|---|
Wavenumber (cm−1) | Description | Wavenumber (cm−1) | Description | Wavenumber (cm−1) | Description | Functional group |
472 | Strong | 472 | Strong | 472 | Strong | Skeletal modes |
859 | Medium | 859 | Medium | 849 | Medium | CH and CH2 (deformation) |
930 | Medium | 930 | Medium | 930 | Medium | C–O–H (bending) |
1078 | Strong | – | – | – | – | C–O–H (bending) |
1249 | Weak | 1258 | Weak | 1258 | Weak | CH2 OH |
1341 | Strong | 1341 | Strong | 1341 | Strong | CH2 (twist) C–O–H (bending) |
1456 | Medium | 1456 | Medium | 1456 | Medium | CH2 (deformation) |