Controlled Release, Disintegration, Antioxidant, and Antimicrobial Properties of Poly (Lactic Acid)/Thymol/Nanoclay Composites
| Autor: | Elena Fortunati, Livia Visai, Alfonso Jiménez, Jose Maria Kenny, Francesco Cristofaro, Ana Beltrán, Marina Ramos, Artur J.M. Valente, Mercedes Ana Peltzer, María del Carmen Garrigós |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología, Análisis de Polímeros y Nanomateriales |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Antioxidant
Polymers and Plastics medicine.medical_treatment 02 engineering and technology migration Article Nanocomposites lcsh:QD241-441 chemistry.chemical_compound 0404 agricultural biotechnology lcsh:Organic chemistry thymol nanocomposites medicine Thymol Migration Films Functional properties functional properties Ethanol 04 agricultural and veterinary sciences General Chemistry 021001 nanoscience & nanotechnology Antimicrobial 040401 food science Controlled release Lactic acid Montmorillonite chemistry PLA Química Analítica films 0210 nano-technology Antibacterial activity Nuclear chemistry |
| Zdroj: | Polymers Volume 12 Issue 9 Polymers, Vol 12, Iss 1878, p 1878 (2020) RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| ISSN: | 2073-4360 |
| Popis: | Nano-biocomposite films based on poly (lactic acid) (PLA) were prepared by adding thymol (8 wt.%) and a commercial montmorillonite (D43B) at different concentrations (2.5 and 5 wt.%). The antioxidant, antimicrobial, and disintegration properties of all films were determined. A kinetic study was carried out to evaluate the thymol release from the polymer matrix into ethanol 10% (v/v) as food simulant. The nanostructured networks formed in binary and ternary systems were of interest in controlling the release of thymol into the food simulant. The results indicated that the diffusion of thymol through the PLA matrix was influenced by the presence of the nanoclay. Disintegration tests demonstrated that the incorporation of both additives promoted the breakdown of the polymer matrix due to the presence of the reactive hydroxyl group in the thymol structure and ammonium groups in D43B. Active films containing thymol and D43B efficiently enhanced the antioxidant activity (inhibition values higher than 77%) of the nano-biocomposites. Finally, the addition of 8 wt.% thymol and 2.5 wt.% D43B significantly increased the antibacterial activity against Escherichia coli and Staphylococcus aureus 8325-4, resulting in a clear advantage to improve the shelf-life of perishable packaged food. Authors would like to thank Spanish Ministry of Economy and Competitiveness (MAT2017-84909-C2-1-R) and Generalitat Valenciana (IDIFEDER/2018/007) for their support of this research. Marina Ramos would like to thank University of Alicante (Spain) for the UAFPU2011-48539721S predoctoral research grant. AJMV thanks ´Coimbra Chemistry Center and Fundação para a Ciência e Tecnologia (FCT) for the financial support through the programmes UID/QUI/UI0313/2020 and COMPETE. |
| Databáze: | OpenAIRE |
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