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Commercial gellan gum contains divalent cation contaminants (mainly Ca 2+ and Mg 2+ ) in levels sufficient to neutralize over one-third of its car☐yl groups. Consequently, in order to dissolve gellan gum in water, the mixtures must be heated to more than 90°C. This has prevented applications of gellan gum to such uses as the immobilization of viable enzymes and cells in beads. A rapid...
Lithium, sodium, potassium, and ammonium salts of the industrial polysaccharide gellan were prepared. The salts were freely soluble in water at room temperature (25°C). The opinion had been generally held that heating to 100°C was necessary for gellan to achieve complete solubility in the presence of mono- or multivalent cations. Then, upon cooling, the solutions would form gels. These conclusions...
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