Aging dynamics in gelatin gel microstructure

Tosh, Susan M.; Marangoni, Alejandro G.; Hallett, F. R.; Britt, Ian J.

doi:10.1016/s0268-005x(03)00018-3

Cited by 48 publications

(31 citation statements)

References 17 publications

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“…This is due to the fact that, on heating the gelatin solutions, the molecules assume a random coil-type conformation. On cooling, reorganization begins and the nuclei appear, due to helical interactions (Tosh et al, 2003). In this experiment the immobilization yield values were 77.31% to 87.92%.…”

Section: Immobilization Yield (Iy)mentioning

confidence: 57%

Influence of bloom number and plastifiers on gelatin matrices produced for enzyme immobilization

Kempka

Souza

et al. 2014

Braz. J. Chem. Eng.

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-In this study the immobilization of lipase in matrices produced with gelatin with different Bloom values and with the addition of plastifiers was investigated to evaluate the influence of the Bloom value, as well as the capacity of the plastifiers to maintain the enzyme immobilized and the immobilization yield. The results indicated the need for crosslinking of the matrices with glutaraldehyde due to the high solubility in water, explained by the amino acid profile, which confirms the solubility of gelatin. Mannitol showed greater efficiency in the lipase immobilization, since it led to more porous structures and more uniform pores. These structures were also influenced by the gelatin concentration; greater concentrations associated with intermediate concentrations of plastifier led to matrices with a greater immobilization yield (87.92%). The X-ray diffraction analysis revealed that the structure of the immobilization matrices was partially crystalline.

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Section: Immobilization Yield (Iy)mentioning

confidence: 57%

Influence of bloom number and plastifiers on gelatin matrices produced for enzyme immobilization

Kempka

Souza

et al. 2014

Braz. J. Chem. Eng.

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“…These helices act as junction zones within the network. (30) In that study, hydrogel samples were incubated at various temperatures for similar incubation times and thawed subsequently at the same rate. The cryogels developed, could be distinguished by their appearance and their swelling properties.…”

Section: Effect Of the Number Of Cryogenic Cyclesmentioning

confidence: 99%

Effect of Cryogenic Treatment on the Rheological Properties of Gelatin Hydrogels

Vlierberghe

Dubruel

Schacht

2010

Journal of Bioactive and Compatible Polymers

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Above the critical gelation concentration, gelatin has the ability to form a gel when cooled below the sol-gel temperature. In the present work, freeze-thaw cycles were implemented on gelatin solutions possessing varying concentrations. The rheological properties of the cryogels developed were compared with hydrogels formed at room temperature. The results indicated that the rheological properties of cryogels were superior to those of the corresponding hydrogels formed at room temperature. In addition, the critical gelation concentration decreased after (repeated) cryo-treatment(s). The effect of applying various (cryo)parameters, including the number of freeze-thaw cycles, the cooling rate, the thawing rate and the gelatin concentration, on the final material properties was examined. The rheological properties of the cryogels improved with an increasing number of cryo-cycles and a decreasing cooling and thawing rate. In a second part of the work, methacrylamide-modified gelatin was treated cryogenically, followed by in situ UV-irradiation to enable radical crosslinking. It was shown that the crosslinking efficiency improved upon freeze-thawing. The latter was however limited by the gelatin concentration, which affects the chain mobility required to induce phase separation. The present work demonstrates that cryogelation offers possibilities to finetune the mechanical properties of hydrogels. The observed findings are of relevance for the field of tissue engineering, since this concept was previously applied for the development of porous gelatin hydrogels as biomaterials. In addition, a cryogenic treatment can be applied to a wide range of synthetic and natural polymers.-3 -

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“…Under the conditions of the present work, the usage of the StokesEinstein formula, to obtain an apparent hydrodynamic radius, R H , is obviously questionable, especially because the viscosity experienced by the large aggregates could not be the viscosity of the solvent [51]. Anyway, since we were interested in following the relative pHinduced size changes, we used the solvent viscosity in the StokesEinstein formula just to obtain an estimate of the radius of a hypothetical sphere that diffuses at the same speed as the aggregates being measured.…”

Section: Dlsmentioning

confidence: 85%

Study of the dynamical behavior of sodium alginate/myoglobin aqueous solutions: A dynamic light scattering study

Branca¹,

Wanderlingh²,

D’Angelo³

et al. 2015

Journal of Molecular Liquids

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Aging dynamics in gelatin gel microstructure

Cited by 48 publications

References 17 publications

Influence of bloom number and plastifiers on gelatin matrices produced for enzyme immobilization

Influence of bloom number and plastifiers on gelatin matrices produced for enzyme immobilization

Effect of Cryogenic Treatment on the Rheological Properties of Gelatin Hydrogels

Study of the dynamical behavior of sodium alginate/myoglobin aqueous solutions: A dynamic light scattering study

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