title: Effects of plasticizers on sorption and optical properties of gum cordia based edible film.
abstract: The present study aimed to characterize a biodegradable film produced from the polysaccharide of an indigenous plant Cordia myxa. Effect of plasticizer type (Glycerol, Sorbitol, PEG200 and PEG 400) and concentration (0-30 %) was studied on sorption and optical properties of the casted film. Increase in plasticizer concentration resulted in increase in equilibrium moisture content of the film and was supported by GAB model of sorption indicating that isotherms were of Type II. The monolayer value increased with the increase in plasticizer concentration with a peak of 0.93 g.g-1 for glycerol. Addition of plasticizers improved the total color (ΔE) with glycerol showing the highest effects. All films showed resistance to UV light in the range of 280-200 nm. The polysaccharide of the fruit of C.myxa can be used to prepare an edible film with improved properties as compared to other available edible coatings.
authors.affiliation: Department of Food Science & Technology, University of Karachi, Karachi, 75270 Pakistan.
authors.forename: Muhammad Abdul
authors.initials: MA
authors.lastname: Haq
authors.affiliation: Department of Food Science & Technology, University of Karachi, Karachi, 75270 Pakistan.
authors.forename: Feroz Alam
authors.initials: FA
authors.lastname: Jafri
authors.affiliation: Department of Food Science & Technology, University of Karachi, Karachi, 75270 Pakistan.
authors.forename: Abid
authors.initials: A
authors.lastname: Hasnain
keywords: Edible film; Gum cordia; Optical properties; Sorption isotherm