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Molar mass and rheological characterisation of an exopolysaccharide from Pediococcus damnosus 2.6

Lambo, Adele LU ; Leeman, Mats LU ; Wahlund, Karl-Gustav LU ; Nyman, Margareta LU ; Öste, Rickard LU and Larsson, Helena LU (2007) In Carbohydrate Polymers 68(3). p.577-586
Abstract
The molar mass and theological properties of an exopolysaccharide (EPS) from Pediococcus damnosus 2.6 were investigated. The molar mass was determined by asymmetrical flow field-flow fractionation coupled with multiangle light scattering and refractive index detection. The EPS was observed to be a flexible chain polymer with a molar mass value of 4 x 10(6) g mol(-1). Heating the sample at 80 degrees C for 10 min caused a shift to lower hydrodynamic radius. The theological behaviour of the EPS was compared to that of a commercial cereal beta-glucan (0.359 x 10(6) g mol(-1)). The maximum storage modulus, G'(max) for EPS solution was lower than that for the cereal beta-glucan at all concentrations, while the relaxation time, t(G'=G") was... (More)
The molar mass and theological properties of an exopolysaccharide (EPS) from Pediococcus damnosus 2.6 were investigated. The molar mass was determined by asymmetrical flow field-flow fractionation coupled with multiangle light scattering and refractive index detection. The EPS was observed to be a flexible chain polymer with a molar mass value of 4 x 10(6) g mol(-1). Heating the sample at 80 degrees C for 10 min caused a shift to lower hydrodynamic radius. The theological behaviour of the EPS was compared to that of a commercial cereal beta-glucan (0.359 x 10(6) g mol(-1)). The maximum storage modulus, G'(max) for EPS solution was lower than that for the cereal beta-glucan at all concentrations, while the relaxation time, t(G'=G") was higher. The G'(max) was reduced on heating the EPS solution at 80 degrees C for 10 min, likely indicating some conformational changes. Three-dimensional models of the polymers revealed some differences in intramolecular hydrogen bonds. The EPS molecule had a ropy nature in solution and this could make it suitable for usage as a thickener in food systems. (c) 2006 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Pediococcus damnosus 2.6, exopolysaccharide, molar mass, root mean, square radius, loss modulus, polydispersity, storage modulus
in
Carbohydrate Polymers
volume
68
issue
3
pages
577 - 586
publisher
Elsevier
external identifiers
  • wos:000245779100023
  • scopus:33847610229
ISSN
0144-8617
DOI
10.1016/j.carbpol.2006.06.037
language
English
LU publication?
yes
id
ae5c8cf0-ad14-472c-891f-1ec817942f7b (old id 666070)
date added to LUP
2007-12-12 12:17:25
date last changed
2017-08-06 03:32:58
@article{ae5c8cf0-ad14-472c-891f-1ec817942f7b,
  abstract     = {The molar mass and theological properties of an exopolysaccharide (EPS) from Pediococcus damnosus 2.6 were investigated. The molar mass was determined by asymmetrical flow field-flow fractionation coupled with multiangle light scattering and refractive index detection. The EPS was observed to be a flexible chain polymer with a molar mass value of 4 x 10(6) g mol(-1). Heating the sample at 80 degrees C for 10 min caused a shift to lower hydrodynamic radius. The theological behaviour of the EPS was compared to that of a commercial cereal beta-glucan (0.359 x 10(6) g mol(-1)). The maximum storage modulus, G'(max) for EPS solution was lower than that for the cereal beta-glucan at all concentrations, while the relaxation time, t(G'=G") was higher. The G'(max) was reduced on heating the EPS solution at 80 degrees C for 10 min, likely indicating some conformational changes. Three-dimensional models of the polymers revealed some differences in intramolecular hydrogen bonds. The EPS molecule had a ropy nature in solution and this could make it suitable for usage as a thickener in food systems. (c) 2006 Elsevier Ltd. All rights reserved.},
  author       = {Lambo, Adele and Leeman, Mats and Wahlund, Karl-Gustav and Nyman, Margareta and Öste, Rickard and Larsson, Helena},
  issn         = {0144-8617},
  keyword      = {Pediococcus damnosus 2.6,exopolysaccharide,molar mass,root mean,square radius,loss modulus,polydispersity,storage modulus},
  language     = {eng},
  number       = {3},
  pages        = {577--586},
  publisher    = {Elsevier},
  series       = {Carbohydrate Polymers},
  title        = {Molar mass and rheological characterisation of an exopolysaccharide from Pediococcus damnosus 2.6},
  url          = {http://dx.doi.org/10.1016/j.carbpol.2006.06.037},
  volume       = {68},
  year         = {2007},
}