Fig. 1

¹H NMR spectra of N-benzyl chitosan in runs 1–3 (a) from 0 to 10 ppm, (b) from 3.2 to 4.2 ppm, and (c) from 2.5 to 3.5 ppm at room temperature in 1% TFA containing D₂O as a solvent. The chitosan data are included for comparison