Salt effects on the diffusion of caffeine in aqueous solutions

被引：3

作者：

Ribeiro, A. C. F. ^{[1
]}

Santos, C. I. A. V. ^{[1
]}

Barros, M. C. F. ^{[1
]}

Gomes, J. C. S. ^{[1
]}

Verissimo, L. M. P. ^{[1
]}

Miguel, M. da G. ^{[1
]}

Esteso, M. A. ^{[2
]}

Lo Nostro, P. ^{[3
,4
]}

Lobo, V. M. M. ^{[1
]}

Leaist, D. G. ^{[5
]}

机构：

[1] Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal

[2] Univ Alcala de Henares, Fac Farm, Dept Quim Fis, Madrid 28871, Spain

[3] Univ Florence, Dept Chem, Florence, Italy

[4] Univ Florence, CSGI, Florence, Italy

[5] St Francis Xavier Univ, Dept Chem, Antigonish, NS B2G 2W5, Canada

来源：

FLUID PHASE EQUILIBRIA | 2013年 / 338卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Diffusion coefficient; Electrolytes; Caffeine; Salting-out; Solutions; NICKEL; COEFFICIENTS; CONSUMPTION; PROTEIN;

D O I：

10.1016/j.fluid.2012.11.017

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Taylor dispersion has been used to measure ternary mutual diffusion coefficients (D-11, D-12, D-21, and D-22) for aqueous solutions of caffeine (1) with added salt (2) (LiCl, NaCl, KCl, RbCl, CsCl, or NiCl2). The measurements were made at 25 degrees C and salt concentrations up to 1.00 mol dm(-3). Salt effects on the transport of caffeine are assessed by comparing the diffusion coefficient of caffeine in salt-free solutions with the caffeine main diffusion coefficient (D-11) measured for the caffeine + salt solutions. Coupled diffusion of caffeine and salt, as indicated by cross-diffusion coefficients D-12 and D-21, is discussed in terms of salting-out effects and the possible formation of caffeine-metal ion complexes. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：197 / 203

页数：7

共 30 条

[1] Salt effects on caffeine solubility, distribution, and self-association [J].

Al-Maaieh, A ;

Flanagan, DR .

JOURNAL OF PHARMACEUTICAL SCIENCES, 2002, 91 (04) :1000-1008

[2]

Alizadeh A., 1980, International Journal of Thermophysics, V1, P243, DOI 10.1007/BF00517126

[3] Nickel toxicity: Effects on growth and metabolism of maize [J].

Baccouch, S ;

Chaoui, A ;

El Ferjani, E .

JOURNAL OF PLANT NUTRITION, 1998, 21 (03) :577-588

[4] Taylor dispersion measurements at low electrolyte concentrations .1. Tetraalkylammonium perchlorate aqueous solutions [J].

Barthel, J ;

Gores, HJ ;

Lohr, CM ;

Seidl, JJ .

JOURNAL OF SOLUTION CHEMISTRY, 1996, 25 (10) :921-935

[5]

Bubnic Z, 2010, ACTA CHIM SLOV, V57, P37

[6] THERMODYNAMICS OF CAFFEINE AQUEOUS-SOLUTIONS [J].

CESARO, A ;

RUSSO, E ;

CRESCENZI, V .

JOURNAL OF PHYSICAL CHEMISTRY, 1976, 80 (03) :335-339

[7]

De Paula OJ, 2005, ARQ BRAS MED VET ZOO, V57, P212, DOI 10.1590/S0102-09352005000800012

[8] TERNARY MUTUAL DIFFUSION-COEFFICIENTS OF MGCL2 + MGSO4 + H2O AND NA2SO4 + MGSO4 + H2O FROM TAYLOR DISPERSION PROFILES [J].

DENG, ZP ;

LEAIST, DG .

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1991, 69 (10) :1548-1553

[9] Molecular modelling and NMR studies of the caffeine dimer [J].

Falk, M ;

Chew, W ;

Waiter, JA ;

Kwiatkowski, W ;

Barclay, KD ;

Klassen, GA .

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1998, 76 (01) :48-56

[10] SITES AND THERMODYNAMIC QUANTITIES ASSOCIATED WITH PROTON AND METAL ION INTERACTION WITH RIBONUCLEIC ACID, DEOXYRIBONUCLEIC ACID, AND THEIR CONSTITUENT BASES, NUCLEOSIDES, AND NUCLEOTIDES [J].

IZATT, RM ;

CHRISTENSEN, JJ ;

RYTTING, JH .

CHEMICAL REVIEWS, 1971, 71 (05) :439-+

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