Gellan gum is a polysaccharide produced by Sphingomonas elodea, a bacteria. Soluble in water, it is used primarily as a alternative to agar as a gelling agent in microbiological culture. Its largest advantages over agar are its almost perfect visual clarity and its strength; it is able to withstand 120 degree Celsius heat, making it especially useful in culturing thermophilic organisms. One needs only approximately half the amount of gellan gum as agar to reach an equivalent gel strength, though the exact texture and quality depends on the concentration of divalent cations present. Polysaccharides (sometimes called glycans) are relatively complex carbohydrates. ... Agar is a galactose polymer (or Agarose) obtained from the cell walls of some species of red algae or seaweed (Sphaerococcus euchema) and species of Gelidium, chiefly from eastern Asia and California. ... Thermophiles produce some of the bright colors of Grand Prismatic Spring, Yellowstone National Park A thermophile is an organism – a type of extremophile – which thrives at relatively high temperatures, up to about 60 °C. Many thermophiles are archaea. ... ...
Gellangum was shown to be poorly absorbed and did not cause any deaths in rats which received a single large dose (5 g/kg bwt) in the diet or by gavage.
Gellangum is a polysaccharide polymer composed of D-mannopyranose with D-glucopyranose and 6-deoxy-L- mannopyronose, calcium, potassium, and sodium salt.
Gellangum is a high-molecular-weight polysaccharidegum produced by a pure-culture fermentation of a carbohydrate with Sphingomonas elodea.
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