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 __   __     ___      _  _     _____    _    _   
 \ \\/ //   / _ \\   | \| ||  |  ___|| | \  / || 
  \   //   | / \ ||  |  ' ||  | ||__   |  \/  || 
  / . \\   | \_/ ||  | .  ||  | ||__   | .  . || 
 /_//\_\\   \___//   |_|\_||  |_____|| |_|\/|_|| 
 `-`  --`   `---`    `-` -`   `-----`  `-`  `-`

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Text this: 1H-NMR analysis of degree of substitution in N,O-carboxymethyl chitosans from various chitosan sources and types