An edible, composite film of lipid and cellulose ethers was developed and appraised as a barrier to moisture vapor transmission. The film was comprised of a matrix of methylcellulose, hydroxypropyl meth‐ylcellulose and saturated C 16 and C 18 fatty acids, with a thin layer of white beeswax laminated to the surface. The edible film effectively retarded transport of moisture at water activities (a w ) up to at least 0.97 and maintained good barrier properties even when the a w on the low‐humidity side of the film was relatively high. The apparent activation energy for water vapor transmission through the edible film was 14.2 ± 2.5 kcal/mole. Electron microscopy revealed the importance of lipid morphology in determining moisture resistance lipid‐base films.
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Kester et al. (1989) studied this question.
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