Rheological properties and interactions between polysaccharides in mixed carrageenan solutions

Du, Lei; Liu, Yang; Geonzon, Lester C.; Xie, Junxia; Matsukawa, Shingo

doi:10.17106/jbr.30.13

Cited by 9 publications

(4 citation statements)

References 18 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference of these carrageenan is the number of sulfate group available per disaccharide, where ƙ-carrageenan has one sulfate group, ι-carrageenan has two, and λ-carrageenan has three [8]. Sulfate groups are known to affect the rheological of carrageenan properties such as viscosity [9]. reported that ƙ-carrageenan produces strong brittle thermo-reversible gels, while ι-carrageenan gives soft elastic thermo-reversible gels and λ-carrageenan is non-gelling [8].…”

Section: Introductionmentioning

confidence: 99%

Purification on Kappa Carrageenan by Re-Precipitation Technique

Shrgawi

Shamsudin

Hanibah

et al. 2021

SSP

View full text Add to dashboard Cite

Purification on kappa (ƙ) carrageenan was performed by dissolving ƙ-carrageenan powder in distilled water and re-precipitated with ethanol and n-hexane separately during re-precipitation process. The purified kappa carrageenan was analyzed by using Fourier transform infrared (FTIR) spectroscopy and carbon, hydrogen, nitrogen, and sulfur (CHNS) elemental analysis. The outcomes from FTIR showed there are physical changes due to intermolecular interactions which lead to decrease and lower intensity of hydroxyl band at 3345 cm-1 after re-precipitated with n-hexane, compared to re-precipitation with ethanol and unpurified ƙ-carrageenan. There were variations observed in the percentages of C, H and S in the CHNS analysis between unpurified and purified ƙ-carrageenan. The successfully purified ƙ-carrageenan are suitable to be used for further application.

show abstract

Section: Introductionmentioning

confidence: 99%

Purification on Kappa Carrageenan by Re-Precipitation Technique

Shrgawi

Shamsudin

Hanibah

et al. 2021

SSP

View full text Add to dashboard Cite

show abstract

“…Particle tracking has been used in numerous applications to study the mechanical and rheological properties of microscopic environments in polymer gels like Carbopol gels [1], in biological systems such as intercellular region of live cells [2,3], and actin solutions and bundles [4] and in food gels, such as gelatin [5], β-glucan solutions [6], carrageenan systems [7,8] and emulsion systems [9,10] providing valuable information on the microstructure and local physical property of the media. The thermal fluctuation of added probe particles gives information of the microenvironment rheology, that is, the local rheological parameters in the spatial range of the particle size [11,12].…”

Section: Introductionmentioning

confidence: 99%

Accuracy improvement of centroid coordinates and particle identification in particle tracking technique

Geonzon

Matsukawa

2019

J Biorheol

Self Cite

View full text Add to dashboard Cite

We have applied an algorithm to improve the accuracy of particle identification and centroid coordinates for each particle image in particle tracking technique. The algorithm introduced two techniques; 1) cutting off by each threshold at the peak in the pixel intensity distribution for each image of local area around the particle, and 2) calculation of the centroid based on pixel intensities in the original image of the particle instead of binarized data. The former properly cuts the noise in the background for each particle which has large variety in level particle by particle due to fluctuating illuminations and out-of-focus particles in the image, and the latter avoids the loss of accuracy by the commonly used binarization. We have demonstrated that the algorithm significantly improves the accuracy in determination of centroid coordinates and the correctness in particle identification. We have also validated the advantage of the algorithm in accuracy by applying the algorithm to a sequence of confocal microscopy images of diffusing particles in a polysaccharide solution. This algorithm will be significantly useful in particle tracking technique for biological systems, especially for fluorescence microscopy observations with considerable obstructive stray fluorescent signals.

show abstract

“…Among the different types of carrageenan, kappa carrageenan (k-carr) and iota carrageenan (i-carr) are widely used in industries due to its gelling behavior. The gelation mechanism of k-carr and i-carr as well as its mixture have been extensively studied [1,2,3,4]. Macroscopic rheological measurements showed that mixtures of k-carr and i-carr undergo two-step gelation process [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

(Invited) Phase Separation in Mixed Polysaccharide Gels

Geonzon

Flores

Bacabac³

et al. 2018

ECS Trans.

View full text Add to dashboard Cite

Studies on phase separation behavior for the mixed polysaccharides of kappa carrageenan (k-carr) and iota carrageenan (i-carr) has been reviewed. It was reported that the temperature dependence of G' and G'' for the mixture solution measured by dynamic rheological measurement showed two step increases in cooling process, suggesting the individual network formation of k- and i-carr chains at gelling temperatures (T g) corresponding to T g for pure each solution of. DSC measurements for the mixture showed two exothermic peaks at the T g’s of pure k- and i-carr, supporting the individual network formation. Diffusions of a probe polymer added in the mixed gel were measured by gradient NMR with a view to revealing the morphological structure in the gel, but adequate information was not obtained. Particle tracking method for fluorescent particles with diameter of 100nm in the mixture was demonstrated suggesting the formation of phase separated structure with k-carr rich and i-carr rich phases from the micro rheological diversity.

show abstract

Rheological properties and interactions between polysaccharides in mixed carrageenan solutions

Cited by 9 publications

References 18 publications

Purification on Kappa Carrageenan by Re-Precipitation Technique

Purification on Kappa Carrageenan by Re-Precipitation Technique

Accuracy improvement of centroid coordinates and particle identification in particle tracking technique

(Invited) Phase Separation in Mixed Polysaccharide Gels

Contact Info

Product

Resources

About