Results 261 to 270 of about 177,103 (312)

The dissolution rate of zinc pyrithione

International Journal of Cosmetic Science, 1985
SynopsisA method of measuring and correlating the rate at which zinc pyrithione dissolves during a shampoo is described. The rise in zinc concentration of a solution in a stirred vessel following the introduction of a dose of zine pyrithione suspension was measured as a function of time using atomic absorption spectrophotometry. An analysis of the mass
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Dissolution Rate of Cholesterol in Monooctanoin

Hepatology, 1984
Monooctanoin is used clinically for dissolution of common bile duct cholesterol gallstones. A number of factors influencing the dissolution rate of cholesterol monohydrate in this solvent were investigated. Water increased cholesterol dissolution rate in a manner inconsistent with previous solubility measurements.
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Investigation of dissolution kinetics for high rates of dissolution

Soviet Physics Journal, 1970
A procedure was developed for investigating the dissolution of crystals that rub against a substrate with the solvent, whereby the process becomes significantly intensified. A theory of the method is presented. The kinetics of dissolution of azobenzene in alcohol at different rates of substrate motion, normal loads on the crystal, and temperatures is ...
N. N. Nilova, G. M. Bartenev, V. T. Borisov   +2 more
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THE RATE OF DISSOLUTION OF COPPER

Canadian Journal of Chemistry, 1954
The rate of dissolution of polycrystalline metallic copper in sulphuric acid solutions has been determined as a function of temperature, oxygen pressure, rotation speed, hydrogen ion concentration, sample area, and corroding solution volume. A typical set of conditions would involve a volume of 500 ml.
Benjamin C.-Y. Lu, W. F. Graydon
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Dissolution Modeling: Factors Affecting the Dissolution Rates of Polydisperse Powders

Pharmaceutical Research, 1993
The dissolution rates of two lots of hydrocortisone (fine and coarse) were simulated using a computer program based on a Noyes-Whitney-type equation. Derivations of the equation were made to compare the accuracy of simulations using spherical and cylindrical particle geometry, with and without a time-dependent diffusion layer thickness.
A T, Lu, M E, Frisella, K C, Johnson
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Variation of Crystal Dissolution Rate Based on a Dissolution Stepwave Model

Science, 2001
A formulation based on defect-generated dissolution stepwaves of the variation of dissolution rate with the degree of undersaturation is validated by near-atomic-scale observations of surfaces, Monte Carlo simulations, and experimental bulk dissolution rates.
A C, Lasaga, A, Luttge
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Regulation of Dissolution Rate by Pellet Geometry

Journal of Pharmaceutical Sciences, 1969
The influence of surface configuration on the dissolution behavior of pellets suspended in a turbulent flow field has been investigated. The rate of dissolution of extruded cellulose acetate hydrogen phthalate pellets was found to be a complex function of surface geometry.
E G, Rippie, J R, Johnson
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Dissolution Rates of Pure Nonionic Surfactants

Langmuir, 2000
no ...
Chen, B. H., Miller, C. A., Walsh, J. M., Warren, P. B., Ruddock, J. N., Garrett, P. R., Argoul, Françoise, Léger, Christophe   +7 more
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Influence of Viscosity and Solubilization on Dissolution Rate

Journal of Pharmaceutical Sciences, 1972
Abstract The dissolution rate of benzoic acid in aqueous sucrose and methylcellulose solutions is inversely proportional to the viscosity of the dissolution medium. The total solubility of benzoic acid in aqueous solutions of polysorbate 80 increases linearly as the concentration of the surfactant is increased.
R J, Braun, E L, Parrott
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Dissolution Rates under Sink Conditions

Journal of Pharmaceutical Sciences, 1971
Abstract Equations are given for the dissolution of a drug into an aqueous phase overlayered with a lipid phase, in which back transfer from the lipid phase is assumed possible. Consideration of both the presence and absence of back transfer, assuming in each that the amount of drug in the aqueous phase either approaches saturation or remains ...
P J, Niebergall, E T, Sugita, R L, Schnaare   +2 more
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