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Diffusion of Amino Acids in non-Newtonian Fluids

Chinese Journal of Chemical Engineering 2006年第4X期14卷 450-455页

作者：朱春英段志青高习群马友光余国琮 State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

The amino acids are necessarily nutritious components, their diffusions in body fluid and blood that belong to typical non-Newtonian fluid are of virtual importance to control the diffusive process and help clinical treatment. In this article, a holographic interferometer has been adopted to measure the diffusivity of amino acids in non-Newtonian fluid with the use of real-time holographic interference technique. In order to prove the reliability of the experimental instrument, the diffusivities of sucrose aqueous solution at 298.15K were determined. The meas- ured result displays a satisfactory accuracy of the apparatus used. Furthermore, the diffusion coefficients of glynine, L-serine, L-threonine and L-valine in polyacrylamide （PAM） aqueous solution at 298.15K were measured, respec- tively. The experimental data were fitted by a newly proposed correlation equation based on Li＇s predictive model. The calculating results by the present model are at considerably good agreement with experimental values, and the maximum average deviation is only 0.5%.

关键词： amino acid non-Newtonian fluid diffusion coefficient holographic interferometer real-time predic-tive model

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Diffusion Coefficients of L-Arginine in Non-Newtonian Fluid

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Chinese Journal of Chemical Engineering 2008年第6期16卷 856-860页

作者：朱春英马友光季喜燕 School of Chemical Engineering and Technology.State Key Laboratory of Cl~emical Engineering Tianjin UniversityTianjin 300072 China

L-Arginine is an important component of amino acid injection. Its diffusion in body fluid and blood is of key importance to understand drug diffusion and drug release. As a fundamental demand for study and being a considerably valuable reference for application, in this study, the diffusion coefficients of L-arginine in polyacrylamide（PAM） aqueous solution used as non-Newtonian fluid similar to blood and body fluid were measured using a holographic interferometer. The effects of interaction among molecules and solution concentration on diffusion were analyzed and discussed, respectively. Based on the obstruction-scaling model, a novel modified model was presented for predicting diffusivity of solute in non-Newtonian fluid. Good agreement was achieved between the calculated value and the experimental data.

关键词： L-arginine diffusion coefficient holographic interferometer non-Newtonian fluid obstruction-scaling model

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