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Table 2 Observed wave numbers and the corresponding frequency assignments

From: Development of nitazoxanide-loaded colon-targeted formulation for intestinal parasitic infections: centre composite design-based optimization and characterization

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