Characterization of the Oral Absorption of β-Lactam Antibiotics. I. Cephalosporins: Determination of Intrinsic Membrane Absorption Parameters in the Rat Intestine In Situ
dc.contributor.author | Amidon, Gordon L. | en_US |
dc.contributor.author | Sinko, Patrick J. | en_US |
dc.date.accessioned | 2006-09-08T19:20:36Z | |
dc.date.available | 2006-09-08T19:20:36Z | |
dc.date.issued | 1988-10 | en_US |
dc.identifier.citation | Sinko, Patrick J.; Amidon, Gordon L.; (1988). "Characterization of the Oral Absorption of β-Lactam Antibiotics. I. Cephalosporins: Determination of Intrinsic Membrane Absorption Parameters in the Rat Intestine In Situ ." Pharmaceutical Research 5(10): 645-650. <http://hdl.handle.net/2027.42/41516> | en_US |
dc.identifier.issn | 1573-904X | en_US |
dc.identifier.issn | 0724-8741 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/41516 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=3244617&dopt=citation | en_US |
dc.description.abstract | The oral absorption of five cephalosporin antibiotics, cefaclor, cefadroxil, cefatrizine, cephalexin, and cephradine, has been studied using a single-pass intestinal perfusion technique in rats. Intrinsic membrane absorption parameters, “unbiased” by the presence of an aqueous permeability (diffusion or stagnant layer), have been calculated utilizing a boundary layer mathematical model. The resultant intrinsic membrane absorption parameters are consistent with a significant carrier-mediated, Michaelis-Menten-type kinetic mechanism and a small passive component in the jejunum. Cefaclor colon permeability is low and does not exhibit concentration dependent behavior. The measured carrier parameters (±SD) for the jejunal perfusions are as follows: cefaclor, J max * = 21.3 (±4.0), K m = 16.1 (±3.6), P m * = 0, and P c * = 1.32 (±0.07); cefadroxil, J max * = 8.4 (±0.8), K m = 5.9 (±0.8), P m * = 0, and P c * = 1.43 (±0.10); cephalexin, J max * = 9.1 (±1.2), K m = 7.2 (±1.2), P m * = 0, and P c * = 1.30 (±0.10); cefatrizine, J max * = 0.73 (±0.19), K m = 0.58 (±0.17), P m * = 0.17 (±0.03), and P c * = 1.25 (±0.10); and cephradine, J max * = 1.57 (±0.84), K m = 1.48 (±0.75), P m * = 0.25 (±0.07), and P c * = 1.06 (±0.08). The colon absorption parameter for cefaclor is P m * = 0.36 (±0.06, where J max * (m M ) is the maximal flux, K m (m M ) is the Michaelis constant, P m * is the passive membrane permeability, and P c *is the carrier permeability. Aminocephalosporin perfusion results indicate that jejunal absorption in the rat occurs by a nonpassive process, with some of the compounds possessing a small but statistically significant passive component, while the colon permeability is low and follows a simple passive absorption mechanism. | en_US |
dc.format.extent | 876029 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media | en_US |
dc.subject.other | Pharmacy | en_US |
dc.subject.other | Biochemistry, General | en_US |
dc.subject.other | Biomedicine | en_US |
dc.subject.other | Nonpassive Absorption | en_US |
dc.subject.other | Intrinsic Permeability | en_US |
dc.subject.other | Biomedical Engineering | en_US |
dc.subject.other | Jejunum | en_US |
dc.subject.other | Unstirred Layer | en_US |
dc.subject.other | Colon | en_US |
dc.subject.other | Concentration Dependent Absorption | en_US |
dc.subject.other | Pharmacology/Toxicology | en_US |
dc.subject.other | Medical Law | en_US |
dc.title | Characterization of the Oral Absorption of β-Lactam Antibiotics. I. Cephalosporins: Determination of Intrinsic Membrane Absorption Parameters in the Rat Intestine In Situ | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Pharmacy and Pharmacology | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | College of Pharmacy, The University of Michigan, Ann Arbor, Michigan, 48109-1065 | en_US |
dc.contributor.affiliationum | College of Pharmacy, The University of Michigan, Ann Arbor, Michigan, 48109-1065 | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.identifier.pmid | 3244617 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/41516/1/11095_2004_Article_306263.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1023/A:1015974920682 | en_US |
dc.identifier.source | Pharmaceutical Research | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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