Abstract
Biodegradable films based on starches from different botanical sources exhibited physicochemical and functional properties which were related with the starch characteristics. However, had inadequate mechanical properties and were hard and brittle. In this research, jackfruit seed starch plasticized with glycerol were developed and characterized. The starch and glycerol concentrations ranged from 2 to 6% w/w and 20 to 60 g/100 g starch, respectively. Bioplastics were obtained by the casting method and characterized in terms of color, mechanical properties, solubility, water vapor permeability (WVP), morphology and free energy of the hydrophobic interaction. Electronic micrographics showed the presence of some intact starch granules. The bioplastics were hydrophilic and those of 6% starch and 40% glycerol were the most hydrophilic (\( \Delta G_{sas}^{tot} \) = 41.35 mJ m−1). The solubility of the films presented a direct relationship with the starch concentration ranging from 16.42 to 23.26%. Increased opacity and color difference were observed with increasing starch concentration. The WVP ranged from 1.374 × 10−3 to 3.07 × 10−4 g m/day m2 which was positively related with the concentration of starch and glycerol. Tensile strength, percent elongation and Young’s Modulus indicated that the jackfruit starch and glycerol provided a film with good mechanical properties. The results replaced that jackfruit starch can be used to develop films, with low opacity, moderate WVP and relatively high mechanical stability, by using glycerol in the gelatinized starch dispersions.
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We thank Foundation for Research Support of the Bahia State (FAPESB) and National Council for Scientific and Technological Development (CNPq) for financial support.
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Santana, R.F., Bonomo, R.C.F., Gandolfi, O.R.R. et al. Characterization of starch-based bioplastics from jackfruit seed plasticized with glycerol. J Food Sci Technol 55, 278–286 (2018). https://doi.org/10.1007/s13197-017-2936-6
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DOI: https://doi.org/10.1007/s13197-017-2936-6