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Advisor(s)
Abstract(s)
Synthetic packaging materials offer cost efficiency and performance but pose environmental risks. This study
explores sustainable alternatives by developing k-carrageenan (KC) films functionalized with curcumin, using
solid dispersions (SDs) to improve curcumin's compatibility, addressing the challenge of incorporating hydrophobic
functionalities into hydrophilic film matrices. Films with varying curcumin content (1–20 wt%; KC1-
KC20) were compared to a base film without curcumin (KC0) regarding water solubility, vapor permeability,
water contact angle, and tensile properties. Compared to KC0, KC10 (10 % curcumin-SDs) exhibited improved
water resistance, with solubility decreasing from 82.89 % to 77.18 %, while maintaining vapor permeability
(2.96 × 10 10 g⋅m/s⋅m2⋅Pa). KC10 demonstrated enhanced tensile properties, with a 12.51 % increase in tensile
modulus (241.47 MPa), a 3.86 % increase in stress at break (3.50 MPa), and a 4.42 % increase in strain at break
(2.36 %). Furthermore, it exhibited potent antioxidant activity without releasing curcumin into a simulated fatty
medium (non-migratory active protection mechanism), effectively preserving olive oil by limiting lipid oxidation
to a peroxide value (PV) of 14 mEq. O2/kg oil, compared to 20 mEq. O2/kg oil in unprotected samples under
accelerated conditions. It demonstrated significant antimicrobial activity with bacterial reductions of 95.4 %
(Escherichia coli) and 90.6 % (Listeria monocytogenes), surpassing KC0. In conclusion, k-carrageenan films functionalized
with curcumin SDs are promising and sustainable alternatives to synthetic packaging materials.
Description
Keywords
K-carrageenan polymeric films Curcumin compatibilization mediated by solid Dispersions Active food packaging Olive oil preservation
Pedagogical Context
Citation
Rezende, Stephany Cunha de; Santamaria-Echart, Arantzazu; Almeida, Heloísa; Helena Scorsato; Marcet, Ismael; Carpintero, Maria; Rendueles, Manuel; Lopretti, Mary; Dias, Madalena Maria; Barreiro, Maria Filomena (2025). Solid dispersions as effective curcumin vehicles to obtain k-carrageenan functional films for olive oil preservation. International Journal of Biological Macromolecules. ISSN 0141-8130. 286, p. 1-11
Publisher
Elsevier