Valorização dos taninos da casca e dos frutos de Anadenanthera colubrina var. Cebil como revestimentos sustentáveis para papel de embalagem de alto desempenho

Abstract

The increase in plastic waste generation and the need to reduce dependence on nonrenewable resources have spurred the development of biodegradable materials derived from renewable sources that can meet market demands without compromising environmental sustainability. In this context, the use of condensed tannins as a coating for packaging paper has attracted the interest of researchers due to their antioxidant properties, UV radiation absorption, and ability to form interactions that can improve the barrier properties, mechanical strength, and stability of materials. Among the species with potential for obtaining these compounds, Anadenanthera colubrina var. cebil stands out, widely known for its pharmacological use and the high tannin content present in its bark. However, other parts of the plant, such as the fruits, remain largely unexplored. Given this, the objective of this study was to evaluate the potential of tannins extracted from the bark and fruits of A. colubrina var. cebil for application as a coating on kraft sack paper. The results demonstrated that both bark and fruit tannins can be used as coatings for packaging paper. In general, bark tannins exhibited better adhesion to the substrate and greater potential for applications aimed at improving barrier properties. In contrast, fruit tannins exhibited distinct behavior, associated with their chemical composition, indicating potential for specific applications that require greater interaction with adhesives or other polymeric matrices. The results obtained expand the possibilities for utilizing this species and reinforce the potential for using its tannins in the development of sustainable coatings for packaging papers.