(CaCl2), Glycerol Concentration and Heat Treatment

Abstract

The aim of this work was to investigate the effect of gellan gum (GG), calcium chloride (CaCl2) and glycerol concentration on physical appearance of the film. It was found that, after heated at 50 °C for 24, hours the films were successfully produced using low amount of GG (0.50, 0.75, and 1.00 g) with effective concentration of CaCl2 (5 mM) and glycerol (50 % (w/w)). The film was not well dried at 40 °C while at 70 and 100 °C, the film formed was easily to rupture due to the overheated. At 1.5 g GG the film cannot be produced due to the formation of highly viscos and sticky formulated solution. The effective glycerol concentration was within the range of 30-50 % (w/w, based on GG weight). At 60 and 70 % (w/w) of glycerol, the films started to distort at the edge due to high concentration of the plasticizer.