Structural studies of an extracellular polysaccharide (S-198) elaborated by Alcaligenes ATCC 31853

Chowdhury, Tofail A.; Lindberg, Bengt; Lindquist, Ulf; Baird, J. Kevin

doi:10.1016/0008-6215(87)84011-9

Cited by 27 publications

(7 citation statements)

References 7 publications

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“…Although the primary structure of S-198 gum [60] is similar to that of gellan [43] [44], welan [55], rhamsan [56], S-657 [57] and S-88 [59] gum, its rheological characteristics differ from gellan (deacylated) [5], native gellan [6] and deacetylated rhamsan [12], but are essentially in agreement with those of welan [51], native rhamsan [52] [53], S-657 [54] and S-88 [58] gums. Thus, S-198 gum molecules may involve intramolecular associations, as do welan, rhamsan, S-657 and S-88 gum molecules.…”

Section: Discussionmentioning

confidence: 88%

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Structure-Function Relationship of a Gellan Family of Polysaccharide, S-198 Gum, Produced by Alcaligenes ATCC31853

Tako¹,

Kitajima²,

Yogi³

et al. 2016

ABC

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The structure-function relationship of a gellan family of polysaccharides, S-198 gum produced by Alcaligenes ATCC31853 was investigated in terms of rheological aspects. The flow curves of S-198 gum showed plastic behavior above 0.3%. Gelation did not occur in S-198 gum solution at low temperature (0˚C), even at 0.8%. Both the viscosity and the elastic modulus remained constant with increasing temperature up to 80˚C. The elastic modulus decreased a little with the addition of CaCl2 (6.8 mM), but then once again remained constant up to 80˚C. The highest elastic modulus was observed for deacylated gellan gum with the addition of CaCl 2 and increased slightly with increasing temperature up to 80˚C, which was considered to be a transition temperature, after which it decreased rapidly. The elastic modulus of S-198 gum in the presence of urea (4.0 M) was lower than that in aqueous solution at low temperature (0˚C), but remained constant with increasing temperature up to 80˚C. The intramolecular associations, (hydrogen bonding and van der Waals forces of attraction), of S-198 gum molecules in aqueous solutions were proposed. The gellan family of polysaccharides, S-198, S-88, S-657, rhamsan, welan and gellan gum, provided a good opportunity to investigate the structure-function relationship for polysaccharides.

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Section: Discussionmentioning

confidence: 88%

“…gum, where the L-rhamnosyl side-chain is substituted at C-4 of every 3-linked D-glucosyl residue [60].…”

Section: Introductionmentioning

confidence: 99%

Structure-Function Relationship of a Gellan Family of Polysaccharide, S-198 Gum, Produced by Alcaligenes ATCC31853

Tako¹,

Kitajima²,

Yogi³

et al. 2016

ABC

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“…368 L-Glucose ( 23) can be made by isomerization of L-fructose (475) using D-arabinose isomerase present in a mutant strain of Klebsiella pneumonia. In this manner L-glucose (23) could be made in 35% yield from L-fructose (475). 369 L-Fructose (475) has itself been made from L-mannose (24) using isomerases present in cell-free extracts of Aerobacter aerogenes (Scheme 77b).…”

Section: Isomerization Between Ketose and Aldosementioning

confidence: 99%

“…l -Altruronic acid has been found both in the capsular polysaccharide of the Gram-positive bacteria Aerococcus viridans var. homari (structure 4 ) and in the Gram-negative Proteus mirabilis O10, a human opportunistic pathogen that causes urinary tract infections. , The rare l -mannose has been found in various cell-wall polysaccharides of different bacteria. − The capsular polysaccharides S-88 (structure 5 ) and S-130 from Sphingomonas both contain l -mannose and are used as gelling agents in the industry . Furthermore, p -nitrophenyl α- l -mannopyranoside can be used to measure the activity of commercial naringinase .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of l-Hexoses

2015

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“…This fact may also explain the strong carboxylate peak in the EPS through the FT-IR analysis. In addition, we detected mannose, which is an usual component commonly found in other sphingans like S-88 and S-198 [7,21,22]. By the above mentioned characterization, we may infer that the studied EPS show a composition similar to those belonged to sphingan family, being produced by several Sphingomonas strains [4,7].…”

Section: Discussionmentioning

confidence: 51%

Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

et al. 2016

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This study aimed to evaluate the emulsion stability of solutions containing exopolysaccharide and culture medium of a Sphingomonas sp. strain with various hydrophobic compounds. The exopolysaccharide characterized belongs to a sphingan group, however, not being a gellan gum as produced by certain Sphingomonas strains. In general, the emulsifying indexes found in this study were above 70% for gasoline, hexane, kerosene and used frying oil. Nonetheless, the best results were achieved in kerosene solutions, which showed an index of 80% after 24 h, remaining stable for more than 168 h in combinations with various EPS concentrations. Interestingly, diesel oil best results were singly achieved in solution pH of 11, showing an index of around 65%. Furthermore, hexane obtained an index of 100% after 24 h when culture medium was used. Thus, these findings highlight the use of EPS as a potential bioemulsifier agent to enhance hydrocarbon degradation and emulsification effects in environmental biotechnology.

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Structural studies of an extracellular polysaccharide (S-198) elaborated by Alcaligenes ATCC 31853

Cited by 27 publications

References 7 publications

Structure-Function Relationship of a Gellan Family of Polysaccharide, S-198 Gum, Produced by Alcaligenes ATCC31853

Structure-Function Relationship of a Gellan Family of Polysaccharide, S-198 Gum, Produced by Alcaligenes ATCC31853

Synthesis of l-Hexoses

Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

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