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Determination of intrinsic membrane transport parameters from perfused intestine experiments: A boundary layer approach to estimating the aqueous and unbiased membrane permeabilities by Donald A. Johnson; Gordon L. Amidon is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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A boundary layer approach is developed for estimating the aqueous resistance in a perfused rat intestine experiment. Knowing the aqueous resistance allows the membrane surface concentration to be calculated as a function of the perfusate inlet concentration and perfusional flow rate. Determination of membrane uptake as a function of the membrane surface concentration rather than the perfusate concentration gives the intrinsic, unbiased membrane parameters for the uptake mechanism of Michaelis-Menten-type kinetics in parallel with passive diffusion. The aqueous resistance derived in the analysis is verified by comparison with flux data for 1-leucine and progesterone measured at various flow rates and intestinal lengths. The approach allows for a direct estimate to be made of the unbiased membrane permeability parameters.

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Author

Donald A. Johnson; Gordon L. Amidon

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-5193)

Published

1988

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)