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Optimal routine conditions for the determination of the degree of acetylation of chitosan by1H-NMR

Authors
Journal
Carbohydrate Polymers
0144-8617
Publisher
Elsevier
Publication Date
Volume
61
Issue
2
Identifiers
DOI: 10.1016/j.carbpol.2005.04.006
Keywords
  • Chitosan
  • Degree Of Acetylation
  • 1H-Nmr

Abstract

Abstract Chitosan applications and properties mostly depend on its degree of acetylation, so methods that allow its accurate determination are needed. 1H-NMR taken in 2% DCl solutions at 70 °C is usually employed for that purpose but suffers from long experimental times. Here, it is demonstrated that this time can be dramatically reduced more than six-fold by simply performing the 1H-NMR experiment at 27 °C (the standard NMR probe temperature) with 90° pulses. Routine conditions allowing DA determinations in less than 3.5 min of NMR time per sample are described.

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