Table 2 Assignment of FTIR spectra of as-synthesized manganese ferrite nanoparticles, APS, APS-modified manganese ferrite, biotin, NHS–biotin and biotin-conjugated manganese ferrite nanoparticles
From: Biotinylated magnetic nanoparticles for pretargeting: synthesis and characterization study
Samples | Stretching frequency (cm−1) | Vibrational mode |
|---|---|---|
Manganese ferrite | 3,415 | ν (O–H) |
573,452 | M–O stretching | |
3,361, 3,294 | νas (N–H) and νs (N–H) | |
3-Aminopropyltrimethoxysilane (APS) | 2,941, 2,842 | νas (C–H) and νs (C–H) |
1,596 | δ (NH2) | |
1,469 | δ (C–H) | |
1,192, 1,084 | Si–O–C stretching | |
3,348 | ν (N–H) | |
APS-modified manganese ferrite | 2,928 | ν (C–H) |
1,560 | δ (NH2) | |
1,490 | δ (C–H) | |
1,114, 1,027 | Si–O–Si and Si–O–Fe linkages | |
586,446 | M–O stretching | |
3,361 | ν (O–H) of –COOH | |
3,308 | ν (N–H) | |
Biotin | 2,969, 2,933 | νas (C–H) and νs (C–H) |
1,706, 1,689 | ν (C = O) of –COOH | |
1,639 | ν (C = O) of –CONH | |
1,480, 1,319 | δ (C–H) and δ (NH) | |
1,015 | ν (C–O) of –COOH | |
3,233 | ν (N–H) | |
2,941 | ν (C–H) | |
NHS–biotin | 1,819, 1,789 | ν (C = O) |
1,748, 1,731, 1,705 | ν (C = O) | |
1,470, 1,370 | δ (C–H) and δ (NH) | |
1,217, 1,072 | ν (N–O) and ν (C–O) of ester | |
3,252 | ν (N–H) | |
2,924 | ν (C–H) | |
Biotin-conjugated manganese ferrite | 1,684 | ν (C = O) amide I |
1,558 | δ (N–H) amide II | |
1,467 | δ (C–H) | |
1,134, 1,023 | Si–O–Si and Si–O–Fe linkages | |
589,435 | M–O stretching |