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Effects of Different Semipermeable Membranes on In Vitro and In Vivo Performance of Microdialysis Probes
Author(s) -
Hsiao John K.,
Ball Beth Ann,
Morrison Paul F.,
Mefford Ivan N.,
Bungay Peter M.
Publication year - 1990
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1990.tb01982.x
Subject(s) - microdialysis , in vivo , membrane , semipermeable membrane , chromatography , chemistry , biophysics , biochemistry , extracellular , biology , microbiology and biotechnology
The in vitro and in vivo performance of three different semipermeable microdialysis membranes was compared: a proprietary polycarbonate‐ether membrane made by Carnegie Medecin; cuprophan, a regenerated cellulose membrane; and polyacrylonitrile. When microdialysis probes were tested in a stirred in vitro solution, large and statistically significant differences among the three membranes in extraction of acid metabolites (3,4‐dihydroxyphenylacetic acid, 5‐hydroxyindoleacetic acid, and homovanillic acid) and acetaminophen were found. Polyacrylonitrile had the highest extractions in vitro. In contrast, when microdialysis probes were implanted in vivo (in rat striatum), extraction of acid metabolites and acetaminophen did not differ significantly among the different membranes. These results are consistent with predictions made by a mathematical model of microdialysis and can be explained by the fact that in vitro the main factor limiting extraction is membrane resistance to diffusion, whereas tissue resistance to diffusion plays a more dominant role in vivo. These findings suggest that (aside from differences in surface area), the choice of semipermeable membrane will generally have little effect on in vivo microdialysis results. Furthermore, in vitro measurements of microdialysis probe extractions are not a reliable way of calibrating in vivo performance.