Desenvolvimento e caracterização de biofilmes ativos contendo sorbato de potassio, feitos de alginato de calcio e acidos graxos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The relevance of suitable developments of biodegradable packaging is becoming vital due to consumers awareness and demand for safer and cleaner environment. Biodegradable films used for food packaging can be produced from natural polymers, like proteins, polysaccharides and/or lipids. In this work sodium alginate ws used and the reticulation of the polymeric matrix was strengthened with CA POT. ++ . Glycerol and sorbitol were lested as plasticizers. To impart the hydrophobicity of the film, saturated fatty acids (C:4 to C:18) were incorporated in the film-forming solution, with special consideration to caprilic acid, (C:8), due to its ability to form transparent films (non emulsionated). The properties of films containing 5% or 10% caprilic acid (relative to the mass of alginate) were characterized and compared to films without the lipid. The water solubility increased slightly in films with caprilic acid and their mechanical resistance (tension and elongation at break) decreased. The addition of caprilic acid improved the water vapor barrier capacity and reduced the degree of swelling. Morphological analyses (SEM) of fractures of films with caprilic acid confirmed a continuous internal structure. Active films were manufactured with potassium sorbate as antimicotic agent. Release tests indicate that the sorbate diffusivity inside the film is significantly reduced in the presence of caprilic acid and this tendency was confirmed with sorbate permeation data.

ASSUNTO(S)

alginatos alginates biofilme antimicoticos biofilms fatty acids difusão acidos graxos diffusion antimicotics

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