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gellan gum : ウィキペディア英語版
gellan gum
Gellan gum is a water-soluble anionic polysaccharide produced by the bacterium ''Sphingomonas elodea'' (formerly ''Pseudomonas elodea''). The gellan-producing bacterium was discovered and isolated by the former Kelco Division of Merck & Company, Inc. in 1978 from the lily plant tissue from a natural pond in Pennsylvania, USA. It was initially identified as a substitute gelling agent at significantly lower use level to replace agar in solid culture media for the growth of various microorganisms 〔Kang K.S., Veeder G.T., Mirrasoul P.J., Kaneko T., Cottrell I.W. (1982) Agar-like polysaccharide produced by a Pseudomonas species: Production and basic properties. Applied & Environmental Microbiology, 43, 1086-1091.〕 Its initial commercial product with the trademark as "GELRITE" gellan gum, was subsequently identified as a suitable agar substitute as gelling agent in various clinical bacteriological media.〔Shungu D, Valiant M, Tutlane V, Weinberg E, Weissberger B, Koupal L, Gadebusch H, Stapley E.: GELRITE as an Agar Substitute in Bacteriological Media, Appl Environ Microbiol. 1983 Oct;46(4):840-5.〕
==Chemical structure==
The repeating unit of the polymer is a tetrasacharide, which consists of two residues of D-glucose and one of each residues of L-rhamnose and D-glucuronic acid. The tetrasacharide repeat has the following structure:
()n. As it is evident from the formula, the tetrasacharide units are connected by (α1→3) glycosidic bonds.

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