Influence of Deep Eutectic Solvents and Polyphenolic Extracts on the Structure and Functional Properties of Sodium Alginate Films
Daniel Szopa, Paulina Wróbel, Julia Zwolińska, Hira Anwar, Maciej Kaniewski, Anna Witek-Krowiak
TL;DR
This study explores how adding deep eutectic solvents and polyphenolic extracts improves the strength, stability, and antimicrobial properties of sodium alginate films for sustainable food packaging.
Contribution
The novel combination of NADES and polyphenolic extract enhances alginate films with antimicrobial, antioxidant, and controlled-release properties for food packaging.
Findings
NADES and polyphenolic extract increased tensile strength and flexibility through hydrogen bonding.
The A4E2 film showed the best balance of mechanical, thermal, and antimicrobial performance.
Phenolic compounds were released gradually in different food simulants, showing suitability for packaging.
Abstract
The growing demand for biodegradable and functional packaging has driven research toward polysaccharide-based materials with improved performance. In this study, sodium alginate films were modified using natural deep eutectic solvents (NADES) and acorn polyphenolic extract to enhance their antimicrobial, mechanical, and thermal properties. The films were acquired by solvent casting and characterized through mechanical, spectroscopic, thermal, and microbiological analyses. Both NADES and the polyphenolic extract enhanced tensile strength and flexibility through additional hydrogen bonding within the alginate network, while the extract also introduced antioxidant functionality. Among all tested formulations, the A4E2 film exhibited the most balanced performance. FTIR spectra revealed hydrogen bonding between the film components, and thermogravimetric analysis showed an approximately 15 °C…
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Taxonomy
TopicsNanocomposite Films for Food Packaging · Advanced Cellulose Research Studies · Polymer Science and PVC