Rheology of gelatin solutions at the sol-gel transition

Abstract

This paper presents the results of rheological measurements of solutions of gelatin in the transition zone preceding the gel temperature. The relaxation function G(t) proposed by Martin, Adolf, and Wilcoxon ͓Phys.Rev. A 39, 1325 ͑1989͔͒ leads to very good agreement between the experimental data ͓Ј͑͒ and Љ͔͑͒ and the calculated curves. The gel strength and characteristic time are determined as a function of temperature.

Frequency- and Temperature-Dependent Rheological Properties of an Amphiphilic Block Co-polymer in Water and Including Cell-Culture Media

“…We also found that there was no significant change of n value by varying concentrations for four systems (data not shown). The independence of n upon concentration was also reported by Peyrelasse et al in rheological studies of physical gelation of gelatin, a natural macromolecule [54].…”

“…In rheological studies of different polymeric systems, such as some chemically-cross-linking processes during formation of some rubbers or resins, Winter and Chambon pointed out that the cross-over point was frequency dependent and thus ambiguous for a network formation [52]. A rigorous criterion to determine the gel point was further proposed and applied [52][53][54][55], according to which the storage modulus and loss modulus, G and G , both scale with frequency, ω, at the gel point as:…”

Microscopic structure of gelatin coacervates

“…The parameter δ is the phase angle or phase shift between the deformation and response that is measured. As far as dynamic behavior is concerned, a large number of experimental studies performed on visco-elastic systems [23][24][25][26][27][28][29][30] have shown that the complex shear modulus G(t) follows a power-law behavior as G(t) ∼ t ∆ , which in the angular frequency, ω gives…”

Rheological properties of concentrated solutions of gelatin in an ionic liquid 1-ethyl-3-methylimidazolium dimethyl phosphate

“…[3][4][5][6][7] Compared to a large number of researches on the gels, there are few rheological studies on gelatin solutions. [2,8,9] As is well known, gelatin is water-soluble, but actually, aqueous solutions of gelatin can be obtained only in low concentrations at high temperatures. Cooling of a gelatin solution induces partial conformational change of gelatin chains into helix and then the sol-gel transition occurs.…”