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SEM images of 2 wt %. chitosan film/membrane (a) 1000× and (b) 2000×; chitosan–gelatin blended (1:1 g; r = 0.5) films/membranes with 3 mM ferulic acid (c) 1000×; (d) 2000×; and (e) with glycerol plasticizer at 2000×; chitosan–gelatin blended (1:1 g; r = 0.5) films/membranes with 6 mM ferulic acid (f) 1000×; (g) 2000×; and (h) with glycerol plasticizer at 2000×.
