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Fourier transform infrared spectroscopy attenuated total reflection (FTIR-ATR) spectrum of the (a) C. tomentosum seaweed extract (blue line) and the different tested films: (b) 1% alginate (red line), (c) 1% alginate with 0.5% of C. tomentosum seaweed extract (green line), (d) 1% chitosan (grey line), and (e) 1% chitosan with 0.5% of C. tomentosum seaweed extract (black line).
