Abstract
The dissolution rates for hydrocortisone alcohol and acetate were determined using a stationary disk/ rotating fluid system. The hydrocortisone was compressed in a tablet die, and the die placed in a vessel above a rotating magnetic bar. Dissolution rates were evaluated in aqueous media under conditions involving the following independent variables: solubility (C s), diffusion coefficient (D), viscosity (v), rotational speed (ω), and tablet radius (r). A design equation which relates dissolution rate (R) to these variables was formulated for the system R α C s D 2/3(v) −1/6(ω) 1/2( r)3/2 This design equation adequately represents the system, which is related to fluid mechanics and convective diffusion models. The fluid mechanics model assumes that the fluid ideally rotates as solid-body rotation and the momentum layer is initiated at the outside radius of the tablet die. The convective diffusion model is based on the formation of a diffusion layer at the outside radius of the dissolving surface and a predictable relationship between the momentum and the mass transport quantities of bulk viscosity and diffusion coefficient. This configuration, like the rotating disk in a stationary fluid, offers the attractive attribute of being useful to study drug release mechanisms for systems of pharmaceutical interest.
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REFERENCES
A. Dakkuri and A. C. Shah. Pharm. Technol. June:28–86 (1986).
A. C. Shah, C. B. Poet, and J. F. Ochs. J. Pharm. Sci. 62:671–677 (1973).
K. G. Nelson and A. C. Shah. J. Pharm. Sci. 64:610–614 (1975).
B. Vongvirat, S. Howard, J. Mauger, and L. Luzzi. Int. J. Pharm. 9:213–219 (1981).
H. Schlichting. Boundary Layer Theory, 6th ed., McGraw-Hill, New York, 1968.
J. H. Wood, J. E. Syarto, and H. Letterman. J. Pharm. Sci. 54:1068 (1965).
G. Milosovich. J. Pharm. Sci. 53:484–487 (1964).
K. A. Smith and C. K. Colton. AICHE 18(5):949–958 (1972).
K. A. Smith and C. K. Colton. AICHE 18(5):958–967 (1972).
T. von Karman. Z. Angew Math. Mech. 1:244–247 (1921).
W. G. Cochran. Proc. Cambr. Phil. Soc. 30:365–375 (1934).
V. Levich. Physicochemical Hydrodynamics, Prentice Hall, Englewood Cliffs, N.J., 1962.
M. H. Rogers and G. N. Lance. Q. J. Mech. Appl. Math. 17:319–330 (1964).
P. Kabasakalian, E. Britt, and Y. Yudis. J. Pharm. Sci. 55:642 (1966).
R. J. Braun and E. L. Parrot. J. Pharm. Sci. 61:592–597 (1972).
N. C. Fawcett and R. Caton. J. Anal. Chem. 48:600–604 (1979).
P. J. Stout, N. Khoury, J. Mauger, and S. Howard. J. Pharm. Sci. 75:65–67 (1986).
A. Paruta, B. Sciarrone, and N. Lordi. J. Pharm. Sci. 58:216–219 (1969).
K. G. Nelson and A. C. Shah. J. Pharm. Sci. 76:799–802 (1987).
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Khoury, N., Mauger, J.W. & Howard, S. Dissolution Rate Studies from a Stationary Disk/Rotating Fluid System. Pharm Res 5, 495–500 (1988). https://doi.org/10.1023/A:1015965223891
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DOI: https://doi.org/10.1023/A:1015965223891