starch, glycerol, carnauba wax and stearic acid concentrations were
chosen through an experimental design, and these formulations
were obtained in optimized area, as described in a previous work
(Chiumarelli & Hubinger, 2012). The stearic acid was used to reduce
the carnauba wax melting point.
Apple slices and cylinders were dipped into cassava starchecar
nauba waxestearic acid emulsions for 2 min and used in respiration
rate and water vapor resistance analyses. For the other analyses, films
were prepared by weighing an emulsion amount that provided
130 2 mm of film thickness on a Teflon casting plate resting on a
leveled surface. Films were dried until constant moisture content at
40 C and 60% RH to avoid cracking, peeled off the casting surface and
conditioned at 25 C and 58% RH in desiccators with a saturated NaBr
solution for 72 h prior to analysis.