Thermal studies on Arabic gum - carrageenan polysaccharides film

Abstract

Abstract:The main objective of this work is to develop film and study the thermal characteristics of polysaccharides films at various concentration of carrageenan in the mixture by calculating activation energy of polysaccharides films. There were four (4) film samples of two polysaccharides combination; arabic gum (AG) and carrageenan (C) with different formulations; sample A, sample B, sample C and sample D prepared. Sample A film is the control sample that contained only arabic gum and distilled water (DI) with 40% weight arabic gum per volume DI water (w/v%). Meanwhile for sample B and C were prepared with concentration 40 w/v% of Arabic gum and two differents of carrageenan concentrations; 1 w/v% and 10 w/v% respectively. Polyethylene glycol 400 (PEG 400) as a plasticiser was added into sample D film. The sample films were thermally characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) under nitrogen atmosphere. The major thermal transitions as well as, activation energies of the major decomposition stages were determined. Sample A and B films exhibited the highest (112.43 kJ/mol) and the lowest (102.89 kJ/mol) activation energy of thermal decomposition, respectively. The activation energies were lower at larger amounts of sulfate groups from carrageenan on the degradation reactions. The DSC trend for all samples shows two (2) major intense peaks recorded in the DSC thermograms; an endothermic transition at temperature around 100 °C and followed by an exothermic transition at temperature around 300 °C. The endothermic transition is due to the heat absorption for dehydration of water, H 2 O and the decomposition of samples process. Meanwhile, the exothermic transition is caused by the formation of H 2 O, CO and CH 4 in polysaccharide film from dehydration, depolymerisation and decomposition at the high-temperature stages.

Investigation of the chemical composition of red pigments and binding media

“…The first mass loss (10-15%) is due to the loss of adsorbed and structural water of gums and is observed between 30 and 150°C. The second mass loss of about 50% at 260-350°C is related with the decomposition of polysaccharide [27,28]. The final mass loss (30%) in the temperature range of 400-600°C could be associated with the thermal decomposition of intermediate residues formed in the carboxymethylated samples with inorganic compounds [29].…”

Purification, characterization and exploitation of Azadirachta indica gum for the production of drug loaded nanocarrier

“…1418 cm −1 corresponded to CH 3 and CH 2 bending, peak 1098 cm −1 corresponded to C-O-C esters ( Phenol sulphuric acid assay clearly indicated the presence of various sugars present as absorbance was found between 420 and 530 nm, which corresponded to glucose, galactose, mannose, xylose (figure 3) (Dodi et al 2016). The thermo gravimetric analysis was done to detect the thermal stability of the polysaccharide (Jamaludin et al 2017). The polysaccharide showed a loss of weight from 100 % to 63.3 % between the temperature range of 50 and 485°C ( figure 4).…”

Spray-Drying Performance and Thermal Stability of L-Ascorbic Acid Microencapsulated with Sodium Alginate and Gum Arabic

“…The pure ALG showed an endothermic transition during the first heating scan with a peak at 102 ºC, associated to a dehydration reaction [44,48]. Then, the glass transition was perceived around 110 ºC [46,47]. The GA revealed a similar endothermic dehydration process in the first heating scan with a peak at 89 ºC.…”

“…The pure ALG consisted in a three-stage process: (i) at 74 ºC with a 15% of mass loss associated to the humidity release, (ii) at 245 ºC with a mass contribution of 36%, and (iii) a stage at 625 ºC with a 18% of mass loss correlated to the decomposition of the previously formed carbonaceous residue [44,45]. The pure GA revealed an analogous behaviour, with a bimodal humidity release stage with peaks at 72 and 103 ºC and a mass loss of 9%, (ii) a main decomposition stage at 309 ºC with 53% of mass loss, and finally (iii) a decomposition at 513 ºC with a mass loss of 27% [46,47].…”