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FTIR spectra of (1) pure drug (MT), (2) pure polymer (MC), (3) physical mixture (drug and polymer), (4) MT niosomal film, (5) physical mixture (drug and cholesterol), (6) physical mixture (drug and span 60), (7) pure cholesterol, and (8) pure span 60.
Abbreviations: FTIR, Fourier transform infrared spectroscopy; MC, methyl cellulose; MT, metoprolol tartarate.
