Alginate/aloe vera films reinforced with tragacanth gum

Abstract

The objective of present study was to investigate the effect of incorporation of varying concentrations (2% to 14%) of Tragacanth gum (TG) to alginate/aloe vera composite films to enhance their functional properties. The resulting films were investigated for their mechanical, barrier, optical properties and biodegradability. The WVP, swelling capacity and thickness of films increased significantly by the addition of TG while film solubility was dropped at higher concentration of TG. It was observed that TG acted as an efficient reinforcing agent for enhancing the strength and flexibility of the films. The tensile strength (TS) of films increased more than threefold as compared to control, reaching a maximum value 67.64 N/mm2at 12% concentration of TG. Colour properties were affected by the addition of TG as the higher the concentration, the darker the films.

Keywords

• Alginate
• Aloe vera
• Organic fiber
• Tragacanth gum
• Biodegradable edible films