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Degradation kinetics of metronidazole and olsalazine by bacteria in ascending colon and in feces of healthy adults.
MedLine Citation:
PMID:  21540091     Owner:  NLM     Status:  Publisher    
PURPOSE: To compare the degradation kinetics of metronidazole and olsalazine by the bacteria of ascending colon and the bacteria of feces of healthy adults. METHODS: Contents of the ascending colon of seven healthy adults were collected under conditions simulating the bioavailability/bioequivalence studies in the fasted and in the fed states on a crossover basis. Material from the contents of the ascending colon was prepared by ultracentrifuging and diluting the precipitate with a volume of normal saline equivalent to that of the supernatant. Fecal material was prepared from feces of three healthy adults collected at two occasions that were separated by at least 6 months. Ex vivo drug degradation kinetics were evaluated under anaerobic conditions. RESULTS: Mean half-lives of metronidazole degradation in material from the contents of the ascending colon collected in the fasted state and in fecal material were 16.1 and 2.4min, respectively (p<0.001). The corresponding numbers for olsalazine were 57.8 and 9.2min, respectively (p<0.001). Both compounds were stable in material from the contents of ascending colon collected in the fed state. CONCLUSIONS: Compared with data in fecal material, degradation of metronidazole and olsalazine in material from the contents of the ascending colon is significantly slower and it becomes non-significant during the arrival of fresh food remnants in the region.
Maria Vertzoni; Anders Carlsson; Bertil Abrahamsson; Konstantinos Goumas; Christos Reppas
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-22
Journal Detail:
Title:  International journal of pharmaceutics     Volume:  -     ISSN:  1873-3476     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-5-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7804127     Medline TA:  Int J Pharm     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier B.V.
Laboratory of Biopharmaceutics and Pharmacokinetics, University of Athens, Athens, Greece.
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