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Films of methylcellulose ranging in thickness from 0.2 to 1.0 mil (0.0051 to 0.025 mm), and exposed to peanut oil at 30°C and 5 psig pressure differential, allowed less than 1.0 μg linoleic acid equivalents‐mil −1 cm −2 24 hr −1 to permeate, provided films were free from imperfections. Examination by scanning electron microscopy verified that many films were imperfect, especially those thinner than 0.2 mil. When films were embedded in chocolate and evaluated by a sensory panel, the 0.2 mil film was detectable, but only slightly objectionable.
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Nelson et al. (1991) studied this question.
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