Development of an experimental procedure for real time investigation of diffusion in foods

Samprovalaki, K.; Fryer, P.J.

doi:10.1007/s11694-011-9114-8

Cited by 3 publications

(2 citation statements)

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“…Erioglaucine disodium salt, with a molecular formula of C 37 H 34 N 2 Na 2 O 9 S 3 , was used as a diffusing substance in the experiments. According to Samprovalaki et al 58 who used the diffusion imaging method to study diffusion in hydrogels, the sensitivity of conversion from the gray to concentration value increases with decreasing concentration of the dye solution because at a higher concentration, the fluctuation of the gray value produces larger errors when the system is saturated. Therefore, in the present experiments, the concentration of erioglaucine disodium salt was fixed at 0.2 mg/mL, which had been calibrated to ensure accuracy of the diffusion imaging method.…”

Section: Experimental Methodsmentioning

confidence: 99%

Evaporation-Induced Diffusion Acceleration in Liquid-Filled Porous Materials

et al. 2021

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Liquid-filled porous materials exist widely in nature and engineering fields, with the diffusion of substances in them playing an important role in system functions. Although surface evaporation is often inevitable in practical scenarios, the evaporation effects on diffusion behavior in liquid-filled porous materials have not been well explored yet. In this work, we performed noninvasive diffusion imaging experiments to observe the diffusion process of erioglaucine disodium salt dye in a liquid-filled nitrocellulose membrane under a wide range of relative humidities (RHs). We found that evaporation can significantly accelerate the diffusion rate and alter concentration distribution compared with the case without evaporation. We explained the accelerated diffusion phenomenon by the mechanism that evaporation would induce a weak flow in liquid-filled porous materials, which leads to convective diffusion, i.e. , evaporation-induced flow and diffusion (EIFD). Based on the EIFD mechanism, we proposed a convective diffusion model to quantitatively predict the diffusion process in liquid-filled porous materials under evaporation and experimentally validated the model. Introducing the dimensionless Peclet ( P e ) number to measure the relative contribution of the evaporation effect to pure molecular diffusion, we demonstrated that even at a high RH of 95%, where the evaporation effect is usually assumed negligible in common sense, the evaporation-induced diffusion still overwhelms the molecular diffusion. The flow velocity induced by evaporation in liquid-filled porous materials was found to be 0.4–5 μm/s, comparable to flow in many biological and biomedical systems. The present analysis may help to explain the driving mechanism of tissue perfusion and provide quantitative analysis or inspire new control methods of flow and material exchange in numerous cutting-edge technologies, such as paper-based diagnostics, hydrogel-based flexible electronics, evaporation-induced electricity generation, and seawater purification.

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Section: Experimental Methodsmentioning

confidence: 99%

Evaporation-Induced Diffusion Acceleration in Liquid-Filled Porous Materials

et al. 2021

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“…For example, mass transfer was enhanced when MEF were applied to the infusion of synthetic colorants in potato, potato-alginate mix and agar gels (Kemp and Fryer, 2007), and adsorption of bovine serum albumin to Cibracron blue Sepharose in an electrochromatographic column increased when electrical fields were applied, making mass transfer of protein in the adsorbent particles more effective (Jia et al, 2007). Diffusion of rhodamine6G and methylene blue into gels of agar and alginate when electrical fields from 0 to 667 V m À1 were applied, showed little effect on diffusion (Samprovalaki, 2005;Samprovalaki and Fryer, 2011). Meanwhile, it was suggested that the presence of MEF during preparation of chitosan coating solutions may influence their transport properties and electrical processing has been suggested as a route to modify edible films and coatings for applications such as increasing shelf life (Souza et al, 2009).…”

Section: Introductionmentioning

confidence: 99%