Development of New Alkylated Carrageenan Derivatives: Physicochemical, Rheological, and Emulsification Properties Assessment

In this research, amphiphilic derivatives of kappa carrageenan (KC) were synthesized by hydrophobic modification with an alkyl halide (1-Octyl chloride). Three polymers different degrees substitution (DS) obtained the Williamson etherification reaction in alkaline medium. The effect molar ratio (R = reagent/polymer) on DS was investigated at ratios (1, 2, and 3). KC (KCRs) characterized techniques such as FT-IR, 1H-NMR, X-ray Diffraction, Scanning electron microscopy, a rheological assessment. FT-IR 1HNMR analyses confirmed binding groups onto molecule. calculated 1H-NMR demonstrated that derivative KCR3 (0.68) presented higher degree compared to KCR1(0.45) KCR2 (0.53). XRD SEM revealed conditions did not alter morphological crystallographic properties, well behavior derivatives. character KCRs using conductivity method which molecular aggregation occurred above critical concentration (CAC). Decreasing CAC values 0.15% (KCR1), 0.11% (KCR2) 0.08% (KCR3)with found. Furthermore, KCR’s greatly improved stability oil/water emulsions droplet size decreased increasing DS. (KCR3) DS, showed greater character, emulsifying power.