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The use of the 3 450 cm-' absorption band as an internal standard in the determination of the extent of N-acetylation of chitosan from the absorbance of the amide I band at 1 655 cm-' was studied. The results show that the technique gives consistent results that are relatively unaffected by whether the sample is air-dried or oven-dried. A number of chitosan samples, covering the range of N-acetyl values from 14% to 72% were analysed by three techniques: infrared spectroscopy using the ratio A,,,, /A345o, hydrobromide salt titration and residual salicylaldehyde determination. There is a very good correlation between the results from infrared spectroscopy and those from the other two analytical techniques, confirming the validity of the former technique.