Thermodynamic compatibility of gelatin and tragacanth gum in aqueous systems
2022
Molaahmadi Bahraseman, Najme | Shekarchizadeh, Hajar | Goli, Sayed Amir Hossein
The influence of total concentration, biopolymer mixing ratio, and ionic strength on the association of tragacanth gum (TG) and gelatin (G) in the aqueous system during acidification was investigated. The onset of soluble complex formation appeared at pHc, where both biopolymers carried a negative charge. Insoluble complexes were formed at pHᵩ₁ by a further pH decrease, owing to increased interactions between the polymers. The complexes formed at pHᵩ₁ still had partly high negative surface charge. Complex coacervation was observed at pHₒₚₜ due to the growing size and number of insoluble complexes. The ζ value of the G- TG significantly decreased at pHₒₚₜ, which was subjected to phase separation. Turbidity decreased at pHᵩ₂ as a result of complex decomposition. The maximum efficiency of complex formation was at the salt-free samples. NaCl reduced critical pHs and complex formation efficiency by screening the ionized groups on the biopolymers.
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