562727.fig.001
Figure 1: FT-IR spectrum of (a) CS and (b) OCM-CS. Intense peak at 1734 cm−1 in the IR spectrum of OCM-CS signifies the presence of –COOH group. Abbreviations: OCM-CS, 6-O-carboxymethyl chitosan; CS, chitosan; FT-IR, Fourier transformation-infrared.