Extração, caracterização e modificação do amido de inhambu (dioscorea trifida l.) para produção de filmes ativos reforçados com nanoamido e nanocristais de celulose contendo hibisco e pimenta rosa como aditivos naturais

Abstract

The use of biodegradable materials has been a focus in the industrial production of packaging. To achieve this, the use of renewable natural polymers has been the most studied alternative. Therefore, the search for new sources of starch is one of the most studied topics in the area, as it is an abundant natural polymer, with characteristics necessary for the production of biodegradable films and because it is sometimes an edible product. Inhambu, the popular name given to the species Dioscorea Trifida L. in the Bahia Southern Lowlands, is a tuber rich in starch. It was used to extract starch, which was later modified, characterized and used in the production of films and nanoparticles. Native and modified starches presented physicochemical characteristics suitable for applications as raw materials in the production of biopolymers. Modifications by acetylation resulted in changes in crystallinity, evidenced in the XRD profile, and in physicochemical characteristics when compared to native starch. The production of native and acetylated nanostarches yielded nanometric particles with potential application as reinforcement in starch films. The films prepared with inhambu starch, reinforced with nanostarch and cellulose nanocrystals, showed good barrier characteristics, such as water vapor permeability and good mechanical performance when compared to the standard film. The films containing natural additives (hibiscus extract and pink pepper oil) performed well in antioxidant and antibacterial potential tests and can be used as packaging devices. The materials produced in this work had their properties evaluated using various characterization techniques, enabling a detailed study to support future applications.