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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