Investigation of the diffusion of dyes in agar gels

Samprovalaki, K.; Robbins, Phillip T.; Fryer, P.J.

doi:10.1016/j.jfoodeng.2012.03.024

Cited by 20 publications

(18 citation statements)

References 37 publications

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“…They were extrapolated for 25 • C and used in this work as: 8.42 × 10 −10 m 2 •s −1 for MB and 8.93 × 10 −10 m 2 •s −1 for RH [24]. These results are in agreement with values determined using other methods [16,19,[39][40][41].…”

Section: Resultssupporting

confidence: 79%

“…This difference is partially caused by lower content agarose in our hydrogel and partially by different methods used for the determination of diffusivity, which is principal for the resulting value of the diffusivity [44]. The published values of diffusion coefficients of MB in 1.5 wt % agarose hydrogel (enriched by 3 wt % CaCl 2 ) were between 2.9 and 3.9 × 10 −10 m 2 •s −1 depending on the MB concentration and pH [40]. Similarly, the diffusion coefficients of RH in in 1.5 wt % agarose hydrogel were between 2 and 3.5 × 10 −10 m 2 •s −1 depending on the concentration and pH [16].…”

Section: Resultsmentioning

confidence: 93%

“…Wang et al [19] characterized the agarose hydrogel used in so-called DGT technique (diffusive gradients in thin films) for monitoring of different substances in natural environments (waters, soils, The highest values of effective diffusion coefficients were determined for pure AG hydrogel. The obtained values can be compared with the results published in other studies [16,19,40,[42][43][44]. Wang et al [19] characterized the agarose hydrogel used in so-called DGT technique (diffusive gradients in thin films) for monitoring of different substances in natural environments (waters, soils, sediments).…”

Section: Resultsmentioning

confidence: 95%

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Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

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The transport properties of agarose hydrogels enriched by humic acids were studied. Methylene blue, rhodamine 6G and Cu(II) ions were incorporated into hydrogel as diffusion probes, and then their release into water was monitored. Cu(II) ions as well as both the dyes studied in this work have high affinity to humic substances and their interactions strongly affected their diffusion in hydrogels. It was confirmed that humic acids retarded the transport of diffusion probes. Humic acids’ enrichment caused the decrease in the values of effective diffusion coefficients due to their complexation with diffusion probes. In general, the diffusion of dyes was more affected by the complexation with humic acids in comparison with Cu(II) ions. The effect of complexation was selective for the particular diffusion probe. The strongest effect was obtained for the diffusion of methylene blue. It was assumed that metal ions interacted preferentially with acidic functional groups. In contrast to Cu(II) ions, dyes can interact with acidic functional groups, and the condensed cyclic structures of the dye probes supported their interactions with the hydrophobic domains of humic substances.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 95%

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Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

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“…A characteristic parameter for all types of diffusion processes is the diffusion coefficient D [23,24]. The thermodynamic background, based on random movement of molecules or particles through Brownian motion, has been elucidated by the EinsteinSmoluchowski equation.…”

Section: Investigation Of Diffusion Processes In Biopolymer Food Gelsmentioning

confidence: 99%

Methods for investigation of diffusion processes and biopolymer physics in food gels

Einhorn-Stoll

Drusch

2015

Current Opinion in Food Science

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“…Based on the literature, factors that affect the diffusion of solute within hydrogel are the hydrogel structure (gel pore size), properties of solutes (concentration and size), diffusion time and temperature of solutes [46,47]. In most cases, the temperature of solute is increased to a mild temperature, usually between 30-50 • C, which has proven to be an effective range for increasing the diffusion coefficient and therefore a better solutes extraction.…”

Section: Heat Treatmentmentioning

confidence: 99%

Durability and Recoverability of Soft Lithographically Patterned Hydrogel Molds for the Formation of Phase Separation Membranes

et al. 2020

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Hydrogel-facilitated phase separation (HFPS) has recently been applied to make microstructured porous membranes by modified phase separation processes. In HFPS, a soft lithographically patterned hydrogel mold is used as a water content source that initiates the phase separation process in membrane fabrication. However, after each membrane casting, the hydrogel content changes due to the diffusion of organic solvent into the hydrogel from the original membrane solution. The absorption of solvent into the hydrogel mold limits the continuous use of the mold in repeated membrane casts. In this study, we investigated a simple treatment process for hydrogel mold recovery, consisting of warm and cold treatment steps to provide solvent extraction without changing the hydrogel mold integrity. The best recovery result was 96%, which was obtained by placing the hydrogel in a warm water bath (50 °C) for 10 min followed by immersing in a cold bath (23 °C) for 4 min and finally 4 min drying in air. This recovery was attributed to nearly complete solvent extraction without any deformation of the hydrogel structure. The reusability of hydrogel can assist in the development of a continuous membrane fabrication process using HFPS.

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Investigation of the diffusion of dyes in agar gels

Cited by 20 publications

References 37 publications

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Methods for investigation of diffusion processes and biopolymer physics in food gels

Durability and Recoverability of Soft Lithographically Patterned Hydrogel Molds for the Formation of Phase Separation Membranes

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