Amorphous supramolecular structure of carboxymethyl cellulose in aqueous solution at different pH values as determined by rheology, small angle X-ray and light scattering

Dogša, Iztok; Tomšič, Matija; Orehek, Janez; Benigar, Elizabeta; Jamnik, Andrej; Stopar, David

doi:10.1016/j.carbpol.2014.04.020

Cited by 60 publications

(62 citation statements)

References 52 publications

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“…In such a case one could try to use the modeling approach. [28][29][30] The presented results clearly show that in the case of both KC and MC systems the dynamic correlation length ξ increases as the gel is formed. This is due to the fact that the dynamic parts of the polymer chains shorten between the progressing static entanglements and consequently become more rigid -they are correlated to longer distances ξ.…”

Section: Discussionmentioning

confidence: 60%

Testing Classical Approach to Polymer Solutions on SAXS Data of λ-Carrageenan, κ-Carrageenan and Methylcellulose Systems

Cerar

Jamnik

2015

ACSi

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In this paper we present the performance of the classical approach to polymer solutions in evaluation and interpretation of the experimental SAXS data obtained for aqueous solutions of two gelling polysaccharides κ-carrageenan and methylcellulose and a non-gelling polysaccharide λ-carrageenan. In a systematic structural SAXS study of various types of polymer solutions we pointed out and discussed the issues encountered and connected to the fact that the studied gels are obviously not "homogeneous gels" in terms of the structural details that the SAXS technique can resolve and the issues connected to the limited experimental resolution of the SAXS technique for such systems. In parallel the necessary modifications of the classical approach equations for the evaluation of the SAXS data are discussed. Furthermore, the detailed structural results of the studied aqueous polymeric systems in liquid state, during the onset of the gelation, and even in the gel state are presented.

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Section: Discussionmentioning

confidence: 60%

Testing Classical Approach to Polymer Solutions on SAXS Data of λ-Carrageenan, κ-Carrageenan and Methylcellulose Systems

Cerar

Jamnik

2015

ACSi

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“…The experimental SAXS data was analyzed using the string-of-beads model, which is explained into detail elsewhere (Benigar et al, 2015;Benigar et al, 2016;Dogsa et al, 2008;Dogsa et al, 2014;Orehek et al, 2013). In the following text the basic features of this model and its application to interpreting SAXS data are briefly outlined.…”

Section: The String-of-beads Modelmentioning

confidence: 99%

“…For the SAXS data evaluation each modelled representative () Pq is tested according to the following expression for the total scattering function   Iq (Benigar et al, 2015;Benigar et al, 2016;Coviello et al, 1998;Dogsa et al, 2014;Orehek et al, 2013;Y. Yuguchi et al, 1996): (Cerar et al, 2015)).…”

Section: The String-of-beads Modelmentioning

confidence: 99%

“…Due to their chemical and structural variability they exhibit different structural and dynamic phenomena that continue to present a great research challenge, even for modern techniques. In our studies we focused on structural and dynamic investigations utilizing various scattering techniques, i.e., small-angle X-ray scattering (SAXS), static light scattering (SLS) and dynamic light scattering (DLS) Benigar et al, 2015;Benigar et al, 2016;Cerar, Jamnik, & Tomsic, 2015;Dogsa, Štrancar, Laggner, & Stopar, 2008;Dogsa et al, 2014;Orehek et al, 2013). The advantage of these techniques is that they are, in general, nondestructive and can directly probe the polymers in aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, in the present study we successfully extend the range of the appropriate SAXS data analysis for the studied polysaccharide systems by also taking into account the contribution of the form factor of the polymer chain or its segments. We achieve this by applying the string-of-beads model (Benigar et al, 2015;Benigar et al, 2016;Dogsa et al, 2008;Dogsa et al, 2014;Orehek et al, 2013), which is briefly described later in the text and provides some additional information about the polymer structure in comparison to the classic approach. Furthermore, it also enables a straightforward visualization of the modeled molecular configurations and even of the anticipated modeled supramolecular structure of the system.…”

Section: Introductionmentioning

confidence: 99%

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Supramolecular structure of methyl cellulose and lambda- and kappa-carrageenan in water: SAXS study using the string-of-beads model

Dogša

Cerar

Jamnik

2017

Carbohydrate Polymers

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Mesoscopic structure of pectin in solution

2017

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Mesoscopic structure of pectin with different molecular characteristics was investigated by means of small angle X-ray scattering (SAXS), electrokinetic measurements and data modelling. The influence of a broad range of pH (2-7) on chain conformation in the dilute and semi-diluted regime was investigated. Scattering data and concomitant analysis revealed two length scales at all environmental conditions studied. pH showed greater influence at acidic values (pH 2.0) enhancing the globular component of the structure due to association of galacturonic acid residues. Double logarithmic scattering intensity plots revealed fractal dimensions of 1.9 ± 0.2 in the low-q regime and 1.5 ± 0.2 in the high q-region, irrespectively of the specific environment. Increase in branching of RG-I regions of the polysaccharide chains enhanced the compact conformation irrespectively of the pH or concentration. The present work shows that radical changes in pectin conformation can be induced only under strongly acidic conditions a finding that has important consequences in tailoring the technological performance of these biopolymers.

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Amorphous supramolecular structure of carboxymethyl cellulose in aqueous solution at different pH values as determined by rheology, small angle X-ray and light scattering

Cited by 60 publications

References 52 publications

Testing Classical Approach to Polymer Solutions on SAXS Data of λ-Carrageenan, κ-Carrageenan and Methylcellulose Systems

Testing Classical Approach to Polymer Solutions on SAXS Data of λ-Carrageenan, κ-Carrageenan and Methylcellulose Systems

Supramolecular structure of methyl cellulose and lambda- and kappa-carrageenan in water: SAXS study using the string-of-beads model

Mesoscopic structure of pectin in solution

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