Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/27115
Title: Diffusion of levodopa in aqueous solutions of hydrochloric acid at 25 °C
Authors: Barros, Marisa C. F. 
Ribeiro, Ana C. F. 
Esteso, Miguel A. 
Lobo, Victor M. M. 
Leaist, Derek G. 
Keywords: Levodopa; Diffusion coefficient; Transport properties; Aqueous solutions
Issue Date: May-2014
Publisher: Elsevier
Citation: BARROS, Marisa C. F. [et al.] - Diffusion of levodopa in aqueous solutions of hydrochloric acid at 25 °C. "The Journal of Chemical Thermodynamics". ISSN 0021-9614. Vol. 72 (2014) p. 44-47
Serial title, monograph or event: The Journal of Chemical Thermodynamics
Volume: 72
Abstract: Ternary mutual diffusion coefficients (D11, D22, D12 and D21) measured by the Taylor dispersion method are reported for aqueous solutions of {levodopa (l-dopa) + HCl} solutions at 25 °C and HCl concentrations up to 0.100 mol · dm−3. The coupled diffusion of l-dopa (1) and HCl (2) is significant, as indicated by large negative cross-diffusion coefficients. D21, for example, reaches values that are larger than D11, the main coefficient of l-dopa. Combined Fick and Nernst–Planck equations are used to analyze the proton coupled diffusion of l-dopa and HCl in terms of the binding of H+ ions to l-dopa and ion migration in the electric field generated by l-dopa and HCl concentration gradients.
URI: http://hdl.handle.net/10316/27115
ISSN: 0021-9614
DOI: 10.1016/j.jct.2013.12.010
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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