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Structural characterization of the chitosan–stearic acid (CS-SA) and polyethyleneimine–stearic acid (PEI-SA) conjugates: (A) 1H, 1H-TOCSY spectrum of stearic acid bound to chitosan in D2O; (B) 1H, 1H-NOESY spectrum of stearic acid bound to polyethyleneimine in CDCl3.
