Dynamic and static light scattering on aqueous solutions of sodium alginate

Strand, Knut Arne; Boee, A.; Dalberg, P. S.; Sikkeland, T.; Smidsroed, Olav

doi:10.1021/ma00230a070

Cited by 47 publications

(30 citation statements)

References 14 publications

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“…The steady increase of R G with time is clear evidence that separation occurred in the FFF channel. The weight average value of 53 nm for the radius of gyration is close to values found in the literature: 50 ± 7 nm obtained by static light scattering measurements at pH 6.3 [38] or 56 nm determined by wide angle LS in 0.1 M NaCl at 25 • C. [34] Evaluation of incremental molar mass and associated R G as well as R H along the elution time allows accurate determination of the correlation between these parameters and extraction of information about macromolecular conformation. Thus, the R H independently obtained from FFF theory increased with experimentally determined molar mass.…”

Section: Determination Of the Alginate Size Distributions In The Absesupporting

confidence: 89%

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Alasonati

Stolpe²,

Benincasa³

et al. 2006

Environ. Chem.

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Abstract. The present study explores the potential use of asymmetrical flow field flow fractionation (aFlFFF) with a multidetection system for the study of metal-alginate interactions. aFlFFF, coupled on-line to a differential refractive index and seven angle laser light scattering detectors was used to provide information on the alginate size distributions. In parallel, the metal distributions of metal-alginate complexes were probed by aFlFFF-high resolution inductively coupled plasma-mass spectrometry. Average values and continuous distributions of molar masses, radiuses of gyration and hydrodynamic radiuses, which are critical for understanding the role of alginates as carriers of metal pollutants, were evaluated in presence of Pb or Cd and compared with those in metal-free solutions of alginate. The values of number average and weight average molar mass, weight average radius of gyration and shape factor for alginate were 150 and 188 kg mol −1 , 53 nm and 1.7, respectively. Alginate molar mass and radius of gyration distributions were slightly shifted to higher values by the addition of micromolar concentrations of Pb or Cd. The alginate size distribution in the presence of Cd was similar to the alginate-alone control, whereas in the presence of Pb the size distribution was broader with a shift of the maximum toward higher molar masses.

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Section: Determination Of the Alginate Size Distributions In The Absesupporting

confidence: 89%

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Alasonati

Stolpe²,

Benincasa³

et al. 2006

Environ. Chem.

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“…As can be seen by optical microscopy the best results were obtained at 3% alginate using 0.1 mol.L -1 CaCl 2 concentration, since, there was no tail formation. The results obtained in this work corroborate with the studies carried out by Strand et al 16 and Burey et al…”

Section: Mathematical Modelssupporting

confidence: 93%

“…Figure 5 presents OM images of calcium alginate microparticles with sodium chloride. According MCCONAUGHY et al 18 and STRAND et al 16 the presence of NaCl promotes a significant increase of the ionic force, leading to lowering values of zeta potential. In order, to verify the influence of NaCl on the alginate microparticles the last procedure was carried out in 3% (m/v) of alginate using 0.1 mol.L -1 CaCl 2 .…”

mentioning

confidence: 98%

Development and Evaluation of a Controlled Release System of TBH Herbicide Using Alginate Microparticles

et al. 2016

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The development of controlled delivery system formulations has received increasing interest in the agriculture area. Tebuthiuron (TBH) is the most commonly used herbicide for weed control in sugar cane and cotton crops. The TBH and some of its metabolites are detected in surface water by leaching process, evidencing contamination and the need for an efficient process to decrease pesticide residues. The development of a controlled system release appears as a good solution. The present investigation aimed to study the development and evaluation of alginate microparticles as a delivery system for the TBH. The calcium alginate microparticles were prepared from the crosslinking of sodium alginate by Ca ++ containing varied amounts of TBH supplied in CaCl 2 aqueous solution. The particle size and morphological analysis of microparticles were determined by optical microscopy (OM) and by field emission gun scanning electron microscopy (FEG-SEM). The encapsulation efficiency and release of TBH studies was accessed by UV-vis spectroscopy. The results show that the polymeric microparticles containing TBH can be obtained successfully through a simple method and is suitable as a controlled release carrier system for herbicides and can be effective for controlling weeds.

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“…Where available, values of radii were obtained by dynamic light scattering (DLS) 37,38 and were generally much larger than those observed here. Indeed, DLS has a much larger bias than FCS toward larger molecules and molecular aggregates because of a dependency of the scattered light intensity on the sixth power of the radius.…”

Section: Resultsmentioning

confidence: 62%

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

et al. 2005

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The Pb and Cd binding capacity of alginates were quantified by the determination of their complex stability constants and the concentration of complexing sites using H + , Pb 2+ , or Cd 2+ selective electrodes in both static and dynamic titrations. Centrifugation filter devices (30 kDa filter cutoff), followed by inductively coupled plasma mass spectrometry (ICP-MS) measurements of lead or cadmium in the filtrates, were used to validate the results. The influence of ionic strength, pH, and the metal-to-alginate ratio was determined for a wide range of metal concentrations. Because of their polyelectrolytic properties, alginates may adopt different conformations depending on the physicochemistry of the medium, including the presence of metals. Therefore, molecular diffusion coefficients of the alginate were determined by fluorescence correlation spectroscopy under the same conditions of pH, ionic strength, and metal-to-alginate ratios that were used for the metal binding studies. The complexation and conformational properties of the alginate were related within the framework of the nonideal competitive adsorption isotherm (NICA) combined with a Donnan approach to account for both intrinsic and electrostatic contributions.

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Dynamic and static light scattering on aqueous solutions of sodium alginate

Cited by 47 publications

References 14 publications

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Development and Evaluation of a Controlled Release System of TBH Herbicide Using Alginate Microparticles

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

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