Desenvolvimento de filmes biodegradáveis, a base de carragena, com propriedades antioxidantes

Abstract

Carrageenan has already been used in food, such as dairy drinks, meat, and in research used as a physical hydrogel. Given its use with hydrogels, it is worth trying to produce films with this material. Currently, biodegradable films have been shown to be a great alternative to nonrenewable sources due to their biocompatibility and biodegradability, in addition, they have been studied for different applications, such as dressings, in the production of food packaging, as well as the ecological part, already that are biodegradable, not generating excessive waste, such as synthetic polymer derivatives. In this sense, we sought to produce biodegradable films based on kappa-carrageenan, which has already been widely used for not presenting high costs, with the addition of gallic acid, giving the material an antioxidant property. Gallic acid was used in an attempt to produce an active package, since antioxidants, when present in low concentrations compared to one of greater significance, delay or inhibit substrate oxidation, increasing the shelf life of the food. The production of the new material, in triplicate, was with κ - carrageenan, polyvinyl alcohol, glycerol and enriched with gallic acid. The characteristics of the new material were evaluated by water solubility, swelling kinetics, diameter, opacity, oil permeability (PO) and the antioxidant capacity was evaluated by capturing the free radical DPPH and determined the amount of phenolic compounds (total phenolics ). The films showed proven antioxidant activity, regardless of their formulation, were oil-impermeable, soluble in water, with good processability, defined homogeneity and easy handling.