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Normalized FTIR spectra for pure materials, the physical mixture (PM) of drug and carrier materials, and nanofibers generated with traditional electrospinning, TES (formulation F-I) and ultrasound-enhanced electrospinning, USES (F-II, F-III and F-IV). Key: CHI = Chitosan, PEO = Polyethylene oxide, TPH = Theophylline.
