Tannins from Amazonian tree barks as potential natural antioxidants: An alternative to synthetic phenolic compounds.

Synthetic antioxidants are widely used to prevent oxidation. However, due to their associated environmental and health risks, the demand for natural alternatives is increasing. This study evaluated the phytochemical profile and antioxidant properties of tannins extracted from the bark of five tree species from the Amazon rainforest: Byrsonima spicata, Croton matourensis, Myrcia splendens, Tapirira guianensis, and Vismia guianensis.

Utilization of rice production residues as a reinforcing agent in bioadhesives based on polyphenols extracted from the bark of trees from the Brazilian Cerrado biome.

The scarcity of nonrenewable resources and the increase in environmental pollution have intensified the search for materials that exhibit specific characteristics and are nontoxic, renewable, and sustainable. Thus, the objective of this work was to produce natural polyphenol adhesives reinforced with rice husk and its ash to increase the mechanical resistance and moisture resistance of the glue line in wood bonded joints. Polyphenols were extracted from the bark of Stryphnodendron adstringens (Mart.

Use of neural network and multivariate statistics in the assessment of pellets produced from the exploitation of agro-industrial residues.

The production of pellets from residual biomass generated monocropping by Brazilian agribusiness is an environmentally and economically interesting alternative in view of the growing demand for clean, low-cost, and efficient energy. In this way, pellets were produced with sugarcane bagasse and coffee processing residues, in different proportions with charcoal fines, aiming to improve the energy properties and add value to the residual biomass. The pellets had their properties compared to the commercial quality standard.