Development of functional films using compatibilization by emulsion techniques Teses uri icon

resumo

  • Due to the great difficulty in incorporating hydrophobic compounds into hydrophilic ma-trix films, new strategies for compatibilization have been sought, considering their appli-cations, e.g., food packaging materials. In this context, the present work aims to develop and optimize one of these new strategies, namely by using Pickering emulsions to develop functionalized films from hydrophobic functionalities. For the production of Pickering emulsions and films, biopolymers are commonly used, which can be used to produce particles to act as emulsion stabilizers and as components of the polymeric matrix in the films. In this work, Pickering emulsions were developed based on chitosan (Ch) and gum Arabic (GA), whose ionic bonding, forms a particle complex that stabilizes the emulsion, then added to the film as a carrier of hydrophobic components, which are incorporated in the oil phase. Diverse emulsion parameters were tested, including the oil/water ratio and solid particle concentration, to obtain a stable system to be added to the films (also added with turmeric extract, in a second phase). With the production of the most promising formulation for the emulsion according to an oil ratio of 0.10, and a Ch/GA particle con-centration of 4% (w/v) the film-forming solution was prepared an emulsion/aqueous dis-persion at a volume ratio of 05/95. It was possible to observe the effects of various factors, such as particle concentration, oil/water ratio, and glycerol content in the emulsions and films. These effects were analyzed concerning the emulsion and the film by analysis of visual inspection, color, morphology, structural and functional analysis by FT-IR, and transparency by UV-vis, among others. For the most promising emulsion formulation with the hydrophobic compound turmeric extract compatibilized, a system with spherical droplets with an average diameter of 3.76 ± 0.70 μm was observed. A yellowish material with a transparency of 18.67% was obtained for the films, demonstrating the influence of the plasticizer agent and the emulsion when compared to the base emulsion.

autores

  • Jeferson Felipe Rio Vicente

data de publicação

  • janeiro 1, 2023