کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6659690 | 1426190 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffusion in ternary aqueous {L-dopaâ¯+â¯(NaSO3)n-β-cyclodextrin} solutions using the pseudo-binary approximation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Mass transport in (drugâ¯+â¯cyclodextrin) solutions is investigated by using Taylor dispersion technique, monitored by differential refractometry, to measure ternary mutual diffusion in aqueous solutions of {L-dopaâ¯+â¯(NaSO3)n-β-CD} (the sodium salt of sulfated β-cyclodextrin). The values of the binary mutual diffusion coefficients of both aqueous L-dopa and aqueous (NaSO3)n-β-CD solutions are close to each other differing only by a few per cent units. As a result, the eigenvalues for the matrix of the ternary Dik diffusion coefficients for aqueous {L-dopa(1)â¯+â¯(NaSO3)n-β-CD(2)} solutions are nearly identical, and the numerical analysis of the Taylor dispersion data may be ill-conditioned in view of the unreliable data obtained from their analysis. To overcome these difficulties, the pseudo-binary diffusion approximation is used to evaluate in a simple way this ternary system. The pseudo-binary diffusion coefficient values found, Dp1 and Dp2, are very close to the binary diffusion ones, being the cross-coefficients approached zero, within the experimental error. From the obtained results, and under the circumstances of this study, we may deduct that no interaction between L-dopa and NaSO3ÃCD was determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 123, August 2018, Pages 17-21
Journal: The Journal of Chemical Thermodynamics - Volume 123, August 2018, Pages 17-21
نویسندگان
Marisa C.F. Barros, Ana C.F. Ribeiro, LuÃs M.P. Verissimo, Derek G. Leaist, Miguel A. Esteso,