Table 2 Observed wave numbers and the corresponding frequency assignments
S. No. | Frequency assignment | Wave number (cm− 1) |
|---|---|---|
Observed wavenumbers (cm− 1) of nitazoxanide | ||
1 | –C=O stretching (amide linkage) | 1662.11 |
2 | –C=C– ring benzene | 1471.73 |
4 | –CH aromatic ring | 3087.92 |
5 | –C=O stretching (ester linkage) | 1772.27 |
6 | –N–H stretching | 3356.15 |
Observed wavenumbers (cm− 1) of chitosan | ||
7 | –OH stretching | 3460.81 |
8 | Symmetric (CH3) stretching and asymmetric (CH2) stretching | 2927.94 |
9 | Amide II band and amide I band | 1600 and 1650 |
10 | C=O stretching in NHCOCH3 group | 1662.39 |
Observed wavenumbers (cm− 1) of drug: polymer (1:1) physical mixture after 15 days | ||
11 | –C=O–N stretching | 1662.75 |
12 | –C=C– ring benzene | 1473.77 |
13 | –C–H aromatic ring | 3088.32 |
14 | C=O stretching | 1773.37 |
15 | –N–H stretching | 3358.30 |