The nine mutual diffusion coeffs. Dij (i, j = 1-3) of the quaternary system α-cyclodextrin (0.02 M)-L-phenylalanine (0.06 M)-monobutylurea (0.06 M)-H2O have been detd. at 25°. Eight reliable expts. were performed at these mean concns. by the free-diffusion method with a Gouy optical interferometer. A min. of three expts. is required to obtain the nine diffusion coeffs. However, several more were required to reduce the errors to an acceptable level. A computer program is described that analyzes data from four-component Gouy free-diffusion expts. Values of those diffusion coeffs. for the flow of L-phenylalanine and monobutylurea caused by a concn. gradient of α-cyclodextrin were particularly sensitive to the choice of expts. used in the data anal. Because of the large uncertainty of these coeffs., any mechanistic interpretation of these data should be viewed with caution. However, the behavior of this system is strongly influenced by the formation of inclusion compds. of L-phenylalanine and monobutylurea with α-cyclodextrin. The diffusion coeffs. may reflect this interaction.

Measurement of the mutual diffusion coefficients at one composition of the four-component system α-cyclodextrin-L-phenylalanine-monobutylurea-water at 25°C / Paduano, Luigi; R., Sartorio; V., Vitagliano; J. G., Albright; D. G., Miller. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - STAMPA. - (1992), pp. 7478-7483.

Measurement of the mutual diffusion coefficients at one composition of the four-component system α-cyclodextrin-L-phenylalanine-monobutylurea-water at 25°C

PADUANO, LUIGI;
1992

Abstract

The nine mutual diffusion coeffs. Dij (i, j = 1-3) of the quaternary system α-cyclodextrin (0.02 M)-L-phenylalanine (0.06 M)-monobutylurea (0.06 M)-H2O have been detd. at 25°. Eight reliable expts. were performed at these mean concns. by the free-diffusion method with a Gouy optical interferometer. A min. of three expts. is required to obtain the nine diffusion coeffs. However, several more were required to reduce the errors to an acceptable level. A computer program is described that analyzes data from four-component Gouy free-diffusion expts. Values of those diffusion coeffs. for the flow of L-phenylalanine and monobutylurea caused by a concn. gradient of α-cyclodextrin were particularly sensitive to the choice of expts. used in the data anal. Because of the large uncertainty of these coeffs., any mechanistic interpretation of these data should be viewed with caution. However, the behavior of this system is strongly influenced by the formation of inclusion compds. of L-phenylalanine and monobutylurea with α-cyclodextrin. The diffusion coeffs. may reflect this interaction.
1992
Measurement of the mutual diffusion coefficients at one composition of the four-component system α-cyclodextrin-L-phenylalanine-monobutylurea-water at 25°C / Paduano, Luigi; R., Sartorio; V., Vitagliano; J. G., Albright; D. G., Miller. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - STAMPA. - (1992), pp. 7478-7483.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/457110
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