Produção e caracterização de biofilme a base de amido, biossurfactante e celulose bacteriana

Abstract

The objective of this work was to develop and characterize biofilm based on starch, bacterial cellulose, biosurfactant and glycerol. The concentrations of bacterial cellulose (40, 50, 60, 70%), biosurfactant (4.45, 9.80, 14.25) were evaluated as potato starch (3 g) and by the Ternary Mix method , 19.95%), glycerol (25.55, 30.20, 35.75, 40.05%), being produced by the casting technique. The biofilms were analyzed for thickness, weight, density, color, solubility, swelling index, adsorption isotherm, water vapor permeability rate, water vapor permeability, structural analysis by scanning electron microscopy and biodegradation. The biofilms formed a cohesive but irregular matrix with presence of granules. Biofilms with higher concentrations of bacterial cellulose presented lower thickness and weight, low solubility, reduced capacity to maintain the integrity of the biofilm and water, confirmed by the high permeability rate to water vapor and with greater degradation in 30 and 40 days. With the increase in biosurfactant and glycerol content, the biofilms showed greater solubility in water, with a slightly grayish coloration and low luminosity. Biofilms with 60% bacterial cellulose, 9.80% biosurfactant and 30.20% glycerol, submerged for 10 minutes in deionized water, had a higher swelling index. Therefore, biofilms consisting of potato starch, bacterial cellulose, biosurfactant and glycerol were generally characterized with good light barrier, moisture maintenance and biodegradability potential.