Abstract
This work focused on the valorization of tar derived from rice husk pyrolysis as a precursor of matrices for the encapsulation of active principles. In this regard, the development of novel films based on alginate and eugenol-loaded tar microparticles with suitable mechanical properties and antibacterial activity was studied. Tar microparticles loaded with eugenol were incorporated into sodium alginate films and the effect on the mechanical, thermal and humidity resistance properties were determined, as well as the antimicrobial activity. Films with different crosslinking degrees were also prepared using CaCl2, and the eugenol controlled release profiles were evaluated. Crosslinked films exhibited improved mechanical and humidity resistance properties, as well as a lower release rate of eugenol in water. The antimicrobial studies showed that eugenol-loaded films present a higher antimicrobial activity against Staphylococcus aureus. Alginate/eugenol-loaded tar microparticles composites showed an enhancement of antibacterial properties and suitable physical characteristics to be used in active packaging applications.
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Acknowledgements
The authors are grateful to the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional del Litoral (U.N.L.), Universidad Tecnológica Nacional (U.T.N.), and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) for the financial support.
Funding
This work was supported by the Grant N° PIP2011 848 and PUE N° 2920160100007 (CONICET), Grant N° PICT2011 1254 and PICT 1208/2016 (National Agency for Scientific and Technological Promotion (ANPCyT)) and Grant N° CAI+D2011 419 and CAID 50420150100068LI (Universidad Nacional del Litoral).
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MET: investigation, formal analysis, data curation, conceptualization, writing—original draft. CB: investigation, formal analysis, data curation, conceptualization, writing—original draft. PS: investigation, formal analysis, writing—original draft. MB: investigation, formal analysis, writing—original draft. US: visualization, conceptualization, writing—review & editing, project administration, funding acquisition. DE: visualization, conceptualization, supervision, writing—review & editing, resources, project administration, funding acquisition.
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Taverna, M.E., Busatto, C.A., Saires, P.J. et al. Bio-composite Films Based on Alginate and Rice Husk Tar Microparticles Loaded with Eugenol for Active Packaging. Waste Biomass Valor 13, 3061–3070 (2022). https://doi.org/10.1007/s12649-022-01679-z
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DOI: https://doi.org/10.1007/s12649-022-01679-z