Method For Determination Of Lidocaine Research Articles

Automated analysis of lidocaine and its metabolite in plasma by in‐tube solid‐phase microextraction coupled with LC‐UV for pharmacokinetic study

A sensitive, selective, and reproducible in-tube solid-phase microextraction and liquid chromatographic (in-tube SPME/LC-UV) method for determination of lidocaine and its metabolite monoethylglycinexylidide (MEGX) in human plasma has been developed, validated, and further applied to pharmacokinetic study in pregnant women with gestational diabetes mellitus (GDM) subjected to epidural anesthesia. Important factors in the optimization of in-tube SPME performance are discussed, including the draw/eject sample volume, draw/eject cycle number, draw/eject flow rate, sample pH, and influence of plasma proteins. The limits of quantification of the in-tube SPME/LC method were 50 ng/mL for both metabolite and lidocaine. The interday and intraday precision had coefficients of variation lower than 8%, and accuracy ranged from 95 to 117%. The response of the in-tube SPME/LC method for analytes was linear over a dynamic range from 50 to 5000 ng/mL, with correlation coefficients higher than 0.9976. The developed in-tube SPME/LC method was successfully used to analyze lidocaine and its metabolite in plasma samples from pregnant women with GDM subjected to epidural anesthesia for pharmacokinetic study.

Hplc Method for Determination of Lidocaine in Admixture with Dextrose Injection

Abstract A reverse-phase HPLC system using a microparticulate octade-cylsilane column and an acetonitrile-phosphate buffer mobile phase is employed to determine lidocaine in an admixture of lidocaine injection with 5 per cent dextrose injection. The method is accurate over the range of 5 to 12.5 μg on column, as employed in our laboratories, which corresponds to 2 to 5 mg/ml of lidocaine hydrochloride in the admixture solution. It is precise (2.00 to 2.88% coefficient of variation) and has been used in stability studies of lidocaine. The method is also used to quantitate a degradation product of lidocaine, 2,6-dimethylaniline, over the range of 5 to 25 ng on column (corresponding to 2 to 10 μg/ml in the admixture solution) with a precision of 1.82 to 4.50% coefficient of variation. Samples are prepared by dilution in methanol containing the internal standard, procaine hydrochloride, and each chromatogram requires about 4 minutes.

High-performance liquid chromatographic method for the simultaneous determination of lidocaine and its N-dealkylated metabolites in plasma.

High-performance liquid chromatographic method for the simultaneous determination of lidocaine and its N-dealkylated metabolites in plasma.

A simple method for gas chromatographic determination of lidocaine in tissues.

A simple gas chromatographic method for the determination of lidocaine in tissues is described. Lidocaine is extracted from the tissue samples using liquid nitrogen. The recoveries of lidocaine from brain, liver, and muscle were 98.6, 99.8 and 89.1%, respectively. Results were reproducible to within 1.0% of lidocaine administered.