ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A thermodynamic analysis unambiguously relates interfacial-electrostatic-potential differences measured with Ag/AgCl capillary electrodes to the equilibrium properties of an aqueous two-phase system. Interfacial electrostatic potentials were measured as a function of total α-cyclodextrin concentration in an aqueous two-phase system containing 9.1 wt. % poly (ethylene glycol), 6.1 wt. % Dextran T-70, and 1-mM potassium iodide. An order-of-magnitude increase in the interfacial electrostatic potential was observed as the total concentration of α-cyclodextrin increased from 0 to 1 mM. Measured partition coefficients for α-chymotrypsin, lysozyme, and bovine serum albumin depend strongly on α-cyclodextrin concentration. For example, as the concentration of α-cyclodextrin rises from 0 to 1 mM, the partition coefficient of lysozyme decreases from 1.7 to 0.55. These measurements are in good agreement with theoretical expectations.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690370912
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