Document Detail


Rapid and simultaneous extraction of propranolol, its neutral and basic metabolites from plasma and assay by high-performance liquid chromatography.
MedLine Citation:
PMID:  4066876     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A high-performance liquid chromatographic method is described for the determination of propranolol, its neutral and basic metabolites from a single plasma sample. These analytes were extracted simply and efficiently by a solid-phase extraction column based on C18 modified silica (C18 Bond-Elut). Propranolol, the 4-hydroxy and N-desisopropyl metabolites were separated on a mu Bondapak C18 column with a mobile phase of acetonitrile--0.1% phosphoric acid. Propranolol glycol was selectively eluted from the C18 Bond-Elut column with acetonitrile and chromatographed separately with a mobile phase of acetonitrile--water. The recoveries of propranolol and all metabolites were greater than 78% with an intra-assay coefficient of variation between 4.9 and 7.3% at a concentration of 5-50 ng/ml. The minimum detectable levels in 1 ml of plasma were 1.0 ng/ml propranolol, 6.0 ng/ml 4-hydroxypropranolol, 1.0 ng/ml N-desisopropylpropranolol and 2.5 ng/ml propranolol glycol. Enzyme hydrolysis, Bond-Elut extraction and high-performance liquid chromatography revealed that propranolol, the neutral and basic metabolites were extensively conjugated in dog plasma (propranolol 67%, 4-hydroxypropranolol 98%, N-desisopropylpropranolol 55% and propranolol glycol 80%). With the use of pure enzymes and a selective inhibitor the nature of this conjugation appeared to involve both glucuronidation and sulfation. The conjugation of propranolol involved mainly glucuronidation (58-62%) compared to sulfation (7-12%), whilst that of 4-hydroxypropranolol mainly involved sulfation (55-65%) compared to glucuronidation (32-38%). The values for N-desisopropylpropranolol and propranolol glycol were 26-31% and 12% sulfation, 16-29% and 68-85% glucuronidation, respectively.
Authors:
P M Harrison; A M Tonkin; C M Cahill; A J McLean
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of chromatography     Volume:  343     ISSN:  -     ISO Abbreviation:  J. Chromatogr.     Publication Date:  1985 Oct 
Date Detail:
Created Date:  1986-01-16     Completed Date:  1986-01-16     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0427043     Medline TA:  J Chromatogr     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  349-58     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Chromatography, High Pressure Liquid
Humans
Hydrolysis
Propranolol / analogs & derivatives,  blood*
Chemical
Reg. No./Substance:
20862-11-7/N-desisopropylpropranolol; 36112-95-5/propranolol glycol; 84418-31-5/N-hydroxypropranolol; 9Y8NXQ24VQ/Propranolol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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