Authors
Raja Priya Rajamani, Samanta Sekhar Khora
Published in
Journal of food science and technology. Volume 62. Issue 11. Pages 2056-2076. Epub Dec 15, 2024.
Abstract
Seaweeds are a rich source of various bioactive compounds and metabolites. In this study, sulfated polysaccharide, κ-carrageenan has been isolated from red algae, Hypnea valentiae, and developed biodegradable film with the addition of plasticizers, sorbitol and polyethylene glycol (PEG 4000) at varying concentrations of carrageenan (1%, 5% and 7% Carr). The biodegradable film exhibited excellent mechanical properties with increasing carrageenan concentration. The 5% Carr film showed improved water barrier properties, high water contact angle (hydrophobicity), high tensile strength (11.38 MPa) and elongation at break (23.27%) which imparts rigidity and flexibility to the film. The results of FTIR and SEM images revealed that the plasticizers and polysaccharides have been blended properly. Since seaweeds are natural antioxidants the κ-carrageenan based biodegradable films displayed strong radical scavenging activity. The 7% Carr film exhibited 86% of radical scavenging activity in ABTS assay and 5% Carr showed 80% of scavenging activity. The biodegradable films displayed efficient antibacterial activity against gram-negative bacteria, E. coli and gram-positive bacteria, B. subtilis. The developed films exhibited excellent biodegradability, the films samples degraded completely within 84 days of soil burial. The κ-carrageenan based biodegradable film (5% Carr) from red algae, H. valentiae better serves as a versatile food packaging material.
PMID:
41041495
Bibliographic data and abstract were imported from PubMed on 03 Oct 2025.
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