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Download Transport Processes in Pharmaceutical Systems (Drugs and the by Gordon L. Amidon, Ping I. Lee, Elizabeth M. Topp PDF

By Gordon L. Amidon, Ping I. Lee, Elizabeth M. Topp

This state-of-the-art reference truly explains pharmaceutical shipping phenomena, demonstrating purposes starting from drug or nutrient uptake into vesicle or mobile suspensions, drug dissolution and absorption throughout organic membranes, complete physique kinetics, and drug unlock from polymer reservoirs and matrices to warmth and mass delivery in freeze-drying and hygroscopicity. specializes in functional purposes of drug supply from a actual and mechanistic viewpoint, highlighting organic platforms. Written through greater than 30 foreign professionals within the box, shipping tactics in Pharmaceutical platforms ·discusses the an important courting among the delivery approach and thermodynamic components ·analyzes the dynamics of diffusion at liquid-liquid, liquid-solid, and liquid-cultured phone interfaces ·covers prodrug layout for making improvements to membrane shipping ·addresses the consequences of exterior stimuli in changing a few typical and artificial polymer matrices ·examines houses of hydrogels, together with synthesis, swelling measure, swelling kinetics, permeability, biocompatibility, and biodegradability ·presents mass move of substances and pharmacokinetics in keeping with mass stability descriptions ·and extra! Containing over one thousand references and greater than 1100 equations, drawings, pictures, micrographs, and tables, shipping methods in Pharmaceutical platforms is a must-read source for examine pharmacists, pharmaceutical scientists and chemists, chemical engineers, actual chemists, and upper-level undergraduate and graduate scholars in those disciplines.

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Transport Processes in Pharmaceutical Systems (Drugs and the Pharmaceutical Sciences)

This state-of-the-art reference truly explains pharmaceutical delivery phenomena, demonstrating purposes starting from drug or nutrient uptake into vesicle or cellphone suspensions, drug dissolution and absorption throughout organic membranes, complete physique kinetics, and drug liberate from polymer reservoirs and matrices to warmth and mass shipping in freeze-drying and hygroscopicity.

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Extra resources for Transport Processes in Pharmaceutical Systems (Drugs and the Pharmaceutical Sciences)

Example text

Under these conditions, the component mass balance for A in this system is d(S ∆x CA ) ϭ S[J(x) Ϫ J(x ϩ ∆x)] dt (14) where S is the surface area of the x-directed faces of the cube (S ϭ ∆y ∆z). Figure 4 Differential fluid element (system) used for the development of Fick’s second law. Diffusion occurs only in the x direction, as shown. The front face of the cube is shaded for contrast. TM Copyright n 2000 by Marcel Dekker, Inc. All Rights Reserved. When S is constant, dividing both sides of the equation by ∆x and taking the limit as ∆x → 0 gives ∂CA ∂J ϭϪ ∂t ∂x (15) where the partial derivative (∂) replaces the ordinary derivative (d) since two independent variables (x and t) appear in the equation.

The concentrations c 1 and c 2 are assumed to be independent of time in Eqs. (36) and (37). This may experimentally imply that the volume of the membrane is negligible compared to that of solutions on either side of the membrane. Practically, neither these concentrations nor the concentration gradient is exactly constant. In diffusion or Caco-2 cell experiments, for example, a solution of higher concentration is initially placed in the donor compartment and a solution of lower concentration is placed in the receptor compartment.

Convection Mass transfer driven by a gradient in pressure. Fick’s laws Equations that describe the relationship between gradients in concentration and the rate of diffusion. See Eqs. (13) and (16). Flux Rate of mass transfer per unit surface area. Fourier’s law for thermal conduction An equation describing the relationship between the rate of heat flux and the temperature gradient. See Eq. (23). Kedem–Katchalsky equations Phenomenological equations for combined convection and diffusion, derived from nonequilibrium thermodynamics.

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