Document Detail


Use of ion-exchange membranes to measure transfer free energies of charged local anesthetics: correlation to anesthetic potency.
MedLine Citation:
PMID:  2352147     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ion-selective electrodes, sensitive to local anesthetic cations, were prepared with carboxylated poly(vinyl chloride) (PVC) membranes. Three plasticizers with varying degrees of polarity were used to adjust the hydrophobicity of the membrane. The affinity of the drug to the ion-exchange membrane was measured by the electromotive force of the cation-selective electrodes. The difference in the transfer free energies of the anesthetics for the membrane was estimated in reference to dibucaine. The values correlated to their clinical potencies. By comparing drugs with similar structures, the transfer free energy per methylene moiety linked to the hydrophilic domain was found to be -1.7 kJ.mol-1, and that of Cl linked to the hydrophobic domain was -3.1 kJ.mol-1. Interferences from Na+ and K+ were estimated as the selectivity coefficients against dibucaine. The values were 2.6 x 10(-5) for Na+ and 1.2 x 10(-4) for K+. The ion-exchange membrane appears to mimic the surface properties of cell membranes. These cation-selective electrodes have potential applicability in measuring charged local anesthetic concentrations (activities) in biological materials under limited conditions.
Authors:
N Kitagawa; Y Kaminoh; M Takasaki; I Ueda
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of pharmaceutical sciences     Volume:  79     ISSN:  0022-3549     ISO Abbreviation:  J Pharm Sci     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-07-16     Completed Date:  1990-07-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985195R     Medline TA:  J Pharm Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  344-8     Citation Subset:  IM    
Affiliation:
Anesthesia Service, Veterans Administration Medical Center, Salt Lake City, UT 84148.
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MeSH Terms
Descriptor/Qualifier:
Anesthetics / analysis*,  pharmacology
Chemistry, Physical
Dibucaine / analysis,  pharmacology
Ion Exchange
Membranes, Artificial
Physicochemical Phenomena
Plasticizers
Polyvinyl Chloride
Potassium
Sodium
Structure-Activity Relationship
Grant Support
ID/Acronym/Agency:
GM25716/GM/NIGMS NIH HHS; GM27670/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Anesthetics; 0/Membranes, Artificial; 0/Plasticizers; 7440-09-7/Potassium; 7440-23-5/Sodium; 85-79-0/Dibucaine; 9002-86-2/Polyvinyl Chloride

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


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