Article

[Enantioselective pharmacokinetics of benproperine in healthy volunteers].

Laboratory of Drug Metabolism and Pharmacokinetics, Shenyang Pharmaceutical University, Shenyang 110015, China.
Yao xue xue bao = Acta pharmaceutica Sinica 12/2000; 35(12):909-12. pp.909-12
Source: PubMed

ABSTRACT To investigate the enantioselective pharmacokinetic process of benproperine in healthy volunteers.
An enantiospecific HPLC method was developed and used to determine the plasma concentrations of each enantiomer. Six healthy Chinese male volunteers received an oral dose of 60 mg (+/-)-benproperine. The ratios of the enantiomers in plasma samples were measured on a chiral AGP column. The plasma concentration of each enantiomer was then calculated using the ratios of enantiomers and total concentration of the two enantiomers previously measured.
The plasma levels of (-)-(S)-benproperine were always significantly higher than those of its antipode in six volunteers. The mean AUC0-t and Cmax values for (-)-(S)-benproperine were 2.18 and 2.12 times higher than those of (+)-(R)-benproperine. There was no significant difference between the T1/2 for both enantiomers, tested by paired t test (P > 0.05). Half an hour after administration of benproperine, the S/R ratio in plasma samples was as high as 3.8, and in 2 hours it drastically decreased to about 2.2, then kept on till 24 hours.
Benproperine showed significant enantioselective pharmacokinetics in the human after an oral dose of the racemate.

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Keywords

+)-(R)-benproperine
 
+/-)-benproperine
 
2 hours
 
antipode
 
enantiomer
 
enantiomers
 
enantioselective pharmacokinetic process
 
enantiospecific HPLC method
 
healthy Chinese male volunteers
 
healthy volunteers
 
mean AUC0-t
 
oral dose
 
plasma concentration
 
plasma concentrations
 
plasma levels
 
plasma samples
 
significant enantioselective pharmacokinetics
 
total concentration
 
two enantiomers
 
volunteers