Scanning electron microscopy observations were carried out to
get a better insight in the homogeneity and the microscopic structure
of films. Scanning electron micrographs of cross sections of
alginate/pectin films are shown in the Fig. 4. Based on various
film-forming polysaccharides, single polymeric films may have different
structures (Phan et al., 2009). Appearance of both sides of
the film was different. Film side facing the casting plate was shiny
and the other one was dull. Pure alginate film was the smoothest. A
film containing pectin showed more structural discontinuities.