Alginate edible films as delivery systems for green tea polyphenols
[EN] This study investigated the potential of alginate edible films to act as vehicles for the delivery of polyphenols to the intestinal tract. Sodium alginate (0.5¿2% w/v) and green tea extract (GTE, 25¿50% w/w) were combined to form films with different microstructural properties via the casting m...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2025 |
| País: | España |
| Recursos: | Universitat Politècnica de València (UPV) |
| Repositório: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglês |
| OAI Identifier: | oai:riunet.upv.es:10251/230666 |
| Acesso em linha: | https://riunet.upv.es/handle/10251/230666 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Food simulants Green tea polyphenols In vitro gastrointestinal digestion Kinetic release Microstructure Sodium alginate films |
| Resumo: | [EN] This study investigated the potential of alginate edible films to act as vehicles for the delivery of polyphenols to the intestinal tract. Sodium alginate (0.5¿2% w/v) and green tea extract (GTE, 25¿50% w/w) were combined to form films with different microstructural properties via the casting method, where their physical, mechanical and barrier properties were analysed. Release studies into a 50% ethanol (v/v) food simulant and under simulated in vitro digestion were also conducted, and the resulting kinetics of polyphenols release was investigated. Composite alginate films with 25% w/w GTE (E~2500 MPa; EAB~14%; k~0.04) showed significantly enhanced mechanical properties and slower rates of polyphenol release than samples with 50% w/w GTE (E~6000 MPa; EAB~6%; k~0.18). Polyphenols entrapped within the 2% alginate ¿ GTE films were successfully released during digestion (~54%), demonstrating their bioaccessibility and availability for absorption by the gastrointestinal tract. The bioaccessibility of green tea polyphenols was significantly enhanced by films with good sustained-release effect (2% alginate ¿ GTE, C/C0 = 54.41 ± 0.75%) respect to the free GTE (C/C0 = 33.73 ± 6.57%). These findings highlight the versatility of bioactive alginate edible films and create a blueprint for the design of sustainable active packaging alternatives with dual functionality. |
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