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https://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: | https://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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