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Advisor(s)
Abstract(s)
Jackfruit seeds have been explored as one interesting alternative starch source to be
used in the production of sustainable bioplastics. In this context, this work aimed to
investigate the effect of sorbitol concentration, one alternative plasticizer to glycerol,
and the starch properties of the films. A complete factorial experimental study was
done based on five different concentrations of starch (2, 3, 4, 5, and 6% w/w) and
sorbitol (40, 50, 60, 70, 80 g per 100 g of starch). The films were produced by cast-
ing technique and were characterized about thickness, optical properties, moisture
resistance, mechanical properties, and morphology. The optical properties revealed
opaque films, with opacity values ranging from 16.04 to 21.26%. Regarding mois-
ture resistance, the less hydrophilic films showed lower plasticizer content. The
water solubility varied from 25.48 to 38.93%; the water vapor permeability ranged
from 9.99 to 11.82 × 10 −9 (g/m s Pa) and the free energy of hydrophobic interac-
tions varied from − 28.16 to 40.13 mJ m −1 . Concerning the mechanical properties,
the tensile strength of the films ranged from 3.55 to 9.25 MPa, and increasing the
sorbitol concentration decreased the tensile strength and increased the elongation
at break. The morphology and structure analysis showed that starch granules were
not fully gelatinized, with microbubbles and grooves in the film matrix. This study
showed the great potential of jackfruit seed starch and sorbitol in the manufacture of
biodegradable films as alternative sustainable packaging.
Description
Keywords
Sustainability Polysaccharides Plasticizer Polymer Bioplastics
Pedagogical Context
Citation
Santana R, Lima CMG, Alves NA, Maniglia BC, Anjos L, Pires ACS, Santos LS, Rodrigues LB, Fontan RCI, Gosnçalves JTT, Guiné RPF, Coutinho HDM, Bonomo RCF (2024) Sorbitol‑plasticized jackfruit starch‑based films: investigation of the effect of the starch and plasticizer concentration on the film properties. Polymer Bulletin, 81(14):13089-13111