Imaging contrast effects in alginate microbeads containing trapped emulsion droplets

Gums induced microstructure stability in Ca(II)-alginate beads containing lactase analyzed by SAXS

“…Measurements were performed through the pulsed magnetic field gradient-spin echo sequence (Stejskal, & Tanner, 1965). The applied magnetic field gradient intensity was calibrated in the range between 1.4 and 2.4 T/m by employing 1.25 g/L CuSO4•5H2O water solution, characterized by a known Dw value (2.3•10 -9 m 2 /s at 25 ºC) (Hester-Reilly, & Shapley, 2007). The bead samples were analyzed by setting the magnetic field gradient amplitude to 1.4 T/m, t (the time between 90 and 180 pulses) to 7.5 ms,  to 0.5 ms, and  to 7.5 ms.…”

Surfactant‐mediated formation of alginate layers at the water‐air interface

“…In this work, we present investigations on polysaccharide solutions of sodium alginate with different cationic surfactants over a broad concentration range. Because of their environmental compatibility, biopolymers like gum acacia, chitosan, or alginate are found in pharmaceutical and food applications, in cosmetic products, and in detergents . Nevertheless, the use of biopolymers makes the study of polymer‐surfactant interactions more complicated because of a broader variation of the polymer chains (molecular weight, monomer sequence, branching, etc).…”

“…Because of their environmental compatibility, biopolymers like gum acacia, chitosan, or alginate are found in pharmaceutical and food applications, in cosmetic products, and in detergents. [34][35][36][37][38][39][40][41][42][43][44] Nevertheless, the use of biopolymers makes the study of polymer-surfactant interactions more complicated because of a broader variation of the polymer chains (molecular weight, monomer sequence, branching, etc). However, there are some important studies, [45][46][47][48] for example, the interesting hyaluronate-cationic surfactant complexes, which are investigated by Thalberg and Lindman, 49 or the carboxymethylcellulose-cationic surfactant complexes investigated by Langevin et al 50 Other important examples are the chitosan-anionic carboxylate surfactants studied by Chiappisi and Gradzielski 51 ; a good overview of the neglected class of surfactants with multiresponsive properties is given in Chiappisi.…”

Sol/Gel Transition of Aqueous Alginate Solutions Induced by Fe2+ Cations

“…In spite of the large number of publications dealing with the ionotropic gelation of alginate with divalent cations, the understanding of the gelation process with iron cations is poor even if this method has been extensively used for the preparation of magnetic gels,23, 24 ferrofluids25–27 and microbeads 28. In addition, the understanding of the mechanism of gelation of alginates induced by iron cations is of importance in the general understanding of polyuronides at low pH as well as for the utilisation of alginates in drug delivery systems.…”