Chemical and rheological properties of bacterial succinoglycan with distinct structural characteristics

Şimşek, Şenay; Mert, Behiç; Campanella, Osvaldo H.; Reuhs, Bradley L.

doi:10.1016/j.carbpol.2008.10.033

Cited by 46 publications

(21 citation statements)

References 16 publications

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“…3). This behavior is typical of solutions composed of entangled macromolecules [21,23,26,27] and it had already been observed in a previous work focused on the effect of temperature on the rheological properties of 1.0 wt.% FucoPol solutions [15]. In addition, for all concentrations studied, the apparent viscosity did not change when reducing the applied shear rate, right after shearing the sample up to a shear rate of 700 s −1 .…”

Section: Effect Of Polymer Concentration On Apparent Viscositysupporting

confidence: 66%

Rheological studies of the fucose-rich exopolysaccharide FucoPol

Torres

Ferreira

Freitas

et al. 2015

International Journal of Biological Macromolecules

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Section: Effect Of Polymer Concentration On Apparent Viscositysupporting

confidence: 66%

Rheological studies of the fucose-rich exopolysaccharide FucoPol

Torres

Ferreira

Freitas

et al. 2015

International Journal of Biological Macromolecules

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“…These differences could be attributed to the differences in molecular weight between the SE's. Others authors observed that an irreversible decrease in molecular weight causes a change in the viscosity system (Fidanza et al ., ; Simsek et al ., ), as observed mainly for SE‐C that showed the lowest molecular weight and viscosity. Both extraction temperature and drying conditions exerted important effect on molecular weight decrease as severe conditions of drying, and higher extraction temperature led to a significant reduction in viscosity values (≥20%).…”

Section: Resultsmentioning

confidence: 71%

Characterisation of soy extract processed under different drying methods and extraction conditions

Fasolin

Cunha

2012

Int J of Food Sci Tech

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Summary Soybean extract (SE), enriched in soy soluble polysaccharide (SSPS), was evaluated in three different conditions varying in extraction temperature and drying process: SE‐A −80 °C, freeze‐dried, SE‐B −80 °C, spray‐dried, SE‐C −95 °C, spray‐dried. Spray‐dried SE presented lower moisture content, smaller and more uniform particles. In addition, zeta potential showed the same negative surface charge for all extracts showing the prevailing behaviour of SSPS. Moreover, all biopolymers were composed of three main molecular weight (Mw) fractions, but the Mw distribution was different between the three ingredients, reflecting their rheological behaviour in aqueous solution. Higher mean Mw led to enhanced apparent viscosity observed in neutral and acid pH for SE‐A, followed by ‐B and ‐C, respectively. The inverse behaviour was observed for intrinsic viscosity at neutral pH. However, SE‐C showed lower intrinsic viscosity at acid pH, which was attributed to protein–polysaccharide interaction presents in the solution.

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“…As size and/or functional groups change, so the physicochemical character of the polymer should also change. For example, the lower the succinate abundance in an exopolysaccharide that has pyruvate, acetate, and succinate groups, the higher its viscosity and elasticity may be in solution at a specific concentration (Simsek et al 2009). It is not apparent whether polymer molecular mass and/or non-saccharide functional groups varied with growth for these experiments with R. tropici.…”

Section: Discussionmentioning

confidence: 98%

Variations in exopolysaccharide production by Rhizobium tropici

2011

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Rhizobium tropici, a legume-symbiont soil bacterium, is known for its copious production of exopolysaccharide (EPS). Many aspects of this organism's growth and EPS production, however, remain uncharacterized, including the influence of environment and culturing conditions upon EPS. Here, we demonstrate that R. tropici EPS chemical composition and yield differ when grown with different substrates in a defined minimal medium in batch culture. Exopolysaccharide was quantified from R. tropici grown using arabinose, glucose, sucrose, mannitol, fructose, or glutamate as a sole carbon source. All tested substrates produced plenteous amounts of exopolysaccharide material. Variations in pH and carbon-to-nitrogen (C/N) ratio also resulted in assorted cell growth and exopolysaccharide production differences. We found that optimizing the C/N ratio has a greater impact upon R. tropici EPS production than upon R. tropici growth. A maximum EPS yield of 4.08 g/L was realized under optimized conditions, which is large even in comparison with other known rhizobia. We provide evidence that the chemical composition of R. tropici EPS can vary with changes to the growth environment. The composition of glucose-grown EPS contained rhamnose-linked residues that were not present in arabinose-grown EPS.

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Chemical and rheological properties of bacterial succinoglycan with distinct structural characteristics

Cited by 46 publications

References 16 publications

Rheological studies of the fucose-rich exopolysaccharide FucoPol

Rheological studies of the fucose-rich exopolysaccharide FucoPol

Characterisation of soy extract processed under different drying methods and extraction conditions

Variations in exopolysaccharide production by Rhizobium tropici

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