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UV spectra: (a) a mixture of N-acetyl-glucosamine and glucosamine hydrochloride in 0.1 M hydrochloric acid solution; (b) chitosan in 0.1 M hydrochloric acid solution. Reprinted from Carbohydrate Research 341, 2006, Liu, D., Wei, Y., Yao, P., Jiang, L., Determination of the degree of acetylation of chitosan by UV spectrometry using dual standards, 782–785, Copyright (2010), with permission from Elsevier [180].
