Determination of the degree of N-acetylation for chitin and chitosan by various NMR spectroscopy techniques: A review
Carbohydrate Polymers, Volume 79, Issue 4, 17 March 2010, Pages 801-810
Mohammad R. Kasaai
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http://dx.doi.org/10.1016/j.carbpol.2009.10.051International Journal of Biological Macromolecules, Volume 14, Issue 3, June 1992, Pages 122-128
Marguerite Rinaudo, Pham Le Dung, Claude Gey, Michel Milas
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http://dx.doi.org/10.1016/S0141-8130(05)80001-7