The influence of the conformational state of κ- and τ-carrageenan on the rate of acid hydrolysis

Hjerde, Torgeir; Smidsrød, Olav; Christensen, Bjørn E.

doi:10.1016/s0008-6215(96)90795-8

Cited by 20 publications

(81 citation statements)

References 42 publications

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“…On the hypothesis of Hjerde, Smidsrød, & Christensen (1996) and 121 Tanford (1961), and glycoside bonds on KC have a similar susceptibility 122 to scission. 123…”

Section: Theoretical Basis: Degradation Rate 111mentioning

confidence: 99%

Kinetic study of κ-carrageenan degradation and its impact on mechanical and structural properties of chitosan/κ-carrageenan film

Shahbazi¹,

Rajabzadeh²,

Ettelaie

et al. 2016

Carbohydrate Polymers

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8The purpose of the current research was to study -carrageenan degradation behavior through 9 thermal treatment, and its influence on chitosan/ -carrageenan film properties. A pseudo first-10 order reaction equation was applied by using reciprocal plots of -carrageenan molecular mass 11 versus heating time, which showed strongly heating time dependence. Incorporation of thermally 12 treated -carrageenan to the chitosan had a deterioration effect on water resistance and water 13 vapor permeability of the blend, in contrast to those for intact. A dramatic decrease of 14 equilibrium moisture content and tensile strength were noticed, in which a longer time was found 15 to be more effective. Furthermore, the contact angle of the films was found to be a function of 16 the heating time. SEM revealed apparent agglomeration of -carrageenan through the thermal 17 process. AFM demonstrated that the intact blend had the most flat surface, whilst the blend 18 containing treated -carrageenan became rugged and uneven with high roughness. 19

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“…On the hypothesis of Hjerde, Smidsrød, & Christensen (1996) and 121 Tanford (1961), and glycoside bonds on KC have a similar susceptibility 122 to scission. 123…”

Section: Theoretical Basis: Degradation Rate 111mentioning

confidence: 99%

Kinetic study of κ-carrageenan degradation and its impact on mechanical and structural properties of chitosan/κ-carrageenan film

Shahbazi¹,

Rajabzadeh²,

Ettelaie

et al. 2016

Carbohydrate Polymers

View full text Add to dashboard Cite

show abstract

“…16,17 In previous works we have investigated the depolymerization by acid hydrolysis of -and -carrageenan both in the ordered and disordered conformations. 18 -20 The hydrolysis was monitored both by the decrease in specific viscosity and increase in the number of reducing end groups, 18,19 as well as by monitoring the changes in molecular weight and molecular weight distribution. 20 These results were interpreted in terms of double-stranded structures for the ordered conformations of both -and -carrageenan, partly supported by the observation of a twofold decrease in M w when going from the ordered to the disordered state.…”

Section: 8 -12mentioning

confidence: 99%

“…3,19 High concentrations may favor nonspecific interactions leading to concentration-dependent networks. In most cases, such as for carrageenans, the ordered state is formed from a disordered state by first dissolving the polymer above T m (e.g., in pure water) and then inducing the ordered state by lowering T or increasing the ionic strength.…”

Section: 8 -12mentioning

confidence: 99%

“…-Carrageenan contains segments and vice versa. 19 Despite the higher charge density that normally favors interchain repulsion, -type structures have a pronounced tendency for aggregation. The content and distribution (normally unknown) of structural irregularities may well influence the conformational properties.…”

Section: 8 -12mentioning

confidence: 99%

“…The purity of the samples was investigated by nmr as described previously. 19 The samples were fractionated on a Sepharose CL-2B column (2.6 ⅐ 80 cm, Pharmacy Biotech) with 0.01M LiCl as the eluent. A fraction of the main peak was in each case collected as shown in Figure 2.…”

Section: Samplesmentioning

confidence: 99%

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Analysis of the conformational properties of ?- and ?-carrageenan by size-exclusion chromatography combined with low-angle laser light scattering

1999

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Separation of ι-, κ and λ-carrageenans by capillary electrophoresis

2001

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The present study reports a novel method for the separation of the high-molecular-weight anionic polysaccharides, iota, kappa, and lambda carrageenans, in capillary electrophoresis (CE). Carrageenan samples are first derivatised with 9-aminopyrene-1,4,6-trisulfonic acid (APTS), separated in an ammonium acetate background electrolyte (BGE) and detected with laser-induced fluorescence (LIF). The effects of changes of instrumental parameters (temperature, injection mode, field strength) and the composition of the BGE (concentration and pH) are reported, and are explained in terms of the physical chemistry of the BGE and the biopolymers. Optimal separation conditions for kappa, iota, and lambda carrageenans, including an APTS internal standard, were found in a polyvinyl alcohol coated capillary with an ammonium acetate BGE of low concentration (25 mM) and moderate pH (8.0). This BGE gave the best reproducibility in tests on iota/kappa mixtures, with relative standard deviations (RSDs) in migration times and normalised peak areas (relative to the APTS internal standard) of less than 0.1% and 1%, respectively. Using this BGE at 50 degrees C and a voltage of 30 kV, all three carrageenan subtypes were separated in a run time of 3 min.

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The influence of the conformational state of κ- and τ-carrageenan on the rate of acid hydrolysis

Cited by 20 publications

References 42 publications

Kinetic study of κ-carrageenan degradation and its impact on mechanical and structural properties of chitosan/κ-carrageenan film

Kinetic study of κ-carrageenan degradation and its impact on mechanical and structural properties of chitosan/κ-carrageenan film

Analysis of the conformational properties of ?- and ?-carrageenan by size-exclusion chromatography combined with low-angle laser light scattering

Separation of ι-, κ and λ-carrageenans by capillary electrophoresis

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