Swelling pressure equilibrium of swollen crosslinked systems in an external field. II: The determination of molecular parameters of gelatin/water gels from the swelling pressure-concentration curves

Holtus, G.; Cölfen, Helmut; Borchard, W.

doi:10.1007/bfb0115012

Cited by 20 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[11] Several studies have been done on the swelling behaviors of physically cross-linked gelatin gels. [12][13][14] Pezron et al [12] studied polymer fibers drawn from gelatin gels by wide-angle X-ray scattering and concluded that significant swelling of the fibers was induced by the water's ability to drive apart the triple-helices in the gels. Mel'nichenko and Klepko [13] investigated the gelatin gels formed under different conditions, such as gelatin volume fraction, temperature of gelation, and the aging time.…”

Section: Introductionmentioning

confidence: 98%

“…In another study, it was concluded that Flory' classical theory was applicable for the description of the swelling behaviors of gels formed by the protein macromolecules. [14] Moreover, it was reported that the swelling of gelatin gel films was a first-order kinetic process. [15] These studies mainly concentrated on the swelling of physically crosslinked gelatin gels in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Swelling Behavior of Physically Cross-Linked Gelatin Gels in Varied Salt Solutions

Qiao¹,

Cao²

2013

Journal of Macromolecular Science, Part B

View full text Add to dashboard Cite

A series of physically cross-linked gelatin networks were prepared and the effects of salt concentration and chemical valence of the salt ions on the swelling properties of the gelatin gels were studied in detail. It was found that the swelling behaviors as polyelectrolytic or polyampholytic gels depended on the charge distribution on the gelatin chains. The swelling capacity of polyelectrolytic gels with excess positive charges decreased with an increase in salt concentrations. However, the swelling capacity of polyelectrolytic gels with excess negative charges showed a nonmonotonic change with salt concentration. For polyampholytic gels, the equilibrium swelling ratio increased monotonously with the concentration of NaCl and CaCl 2 solutions . On the other hand, the swelling capacities of the polymer networks increased first and were then followed by a decrease with an increase in the concentration of AlCl 3 solution. Moreover, the swelling kinetics of the gelatin gels in varied salt solutions with different concentrations was also investigated.

show abstract

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Swelling Behavior of Physically Cross-Linked Gelatin Gels in Varied Salt Solutions

Qiao¹,

Cao²

2013

Journal of Macromolecular Science, Part B

View full text Add to dashboard Cite

show abstract

Soluble parts in gelatin/water gels

Cölfen¹,

Borchard²

1994

Acta Polymerica

View full text Add to dashboard Cite

So-called soluble parts were extracted from gelatidwater gels by means of deswelling caused by application of a swelling pressure. The soluble parts were characterized by FTIR spectroscopy, time-of-flight mass spectrometry, analytical ultracentrifugation and amino acid analysis. The results are compared with literature data.The extracted gelatin has a composition similar to the original gelatin. The extract has a much lower molar mass than the soluble parts obtained by different extraction procedures reported in the literature. This supports the conclusion that there must be at least two types of soluble parts. Soluble part of type 1 has molar masses up to 4000 g/mol, has composition similar to the original gelatin and shows virtually no gelling abilities, although an association of the molecules occurs. Soluble part of type 2 consists of a significant amount of a,(I) chains of type (I) collagen or their fragments and probably has weak gelling abilities.

show abstract

Osmotic Pressure and Phase Boundary Determination of Multiphase Systems by Analytical Ultracentrifugation

et al. 2008

View full text Add to dashboard Cite

We show that analytical ultracentrifugation can be applied to derive full equations of state of colloids in a single sedimentation equilibrium experiment, by determination of single-phase boundaries as well as of osmotic pressure versus concentration at fixed temperatures. A continuous dependence of the osmotic pressure, over orders of magnitude between at least approximately 10(1) and 10(4) Pa, and a wide concentration range, are determined in agreement with standard theoretical considerations. Two model experimental colloidal systems are investigated: For a well-known synthetic clay system (laponite), it is shown that two regimes-counter-ion ideal gas and interacting double layers-can easily be identified in the equation of state, whereas metastable glass- or microphase-separated gel states previously encountered in osmotic stress measurements of laponite are circumvented. For the case of rigid, crystallized catanionic bilayers, single phase domains can be identified. Osmotic pressure results in this case disagree with results obtained using the classical osmotic stress technique, as a result of sample adhesion to the ultracentrifuge cell windows and uncertainty due to possible micromolar ion contamination.

show abstract

Swelling pressure equilibrium of swollen crosslinked systems in an external field. II: The determination of molecular parameters of gelatin/water gels from the swelling pressure-concentration curves

Cited by 20 publications

References 26 publications

Swelling Behavior of Physically Cross-Linked Gelatin Gels in Varied Salt Solutions

Swelling Behavior of Physically Cross-Linked Gelatin Gels in Varied Salt Solutions

Soluble parts in gelatin/water gels

Osmotic Pressure and Phase Boundary Determination of Multiphase Systems by Analytical Ultracentrifugation

Contact Info

Product

Resources

About