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A simple and fast method for determination of benzocaine and lidocaine in pharmaceutical formulations by capillary electrophoresis with spectrophotometric detection
Author(s) -
Junger Ayandra Santos,
Jesus Francielly Fernanda Souza,
Fracassi da Silva José Alberto,
Daniel Daniela,
Jesus Dosil Pereira
Publication year - 2019
Publication title -
separation science plus
Language(s) - English
Resource type - Journals
ISSN - 2573-1815
DOI - 10.1002/sscp.201900054
Subject(s) - benzocaine , chromatography , capillary electrophoresis , chemistry , lidocaine , detection limit , dilution , dosage form , extraction (chemistry) , anesthesia , medicine , physics , thermodynamics
A novel, simple, and rapid method for the determination of the anesthetics benzocaine and lidocaine in pharmaceutical formulations using capillary electrophoresis with spectrophotometric detection (210 nm) is proposed. In this method, the sample preparation was fast and simple, using only aqueous dilution or extraction with sonication aid. A background electrolyte composed by 10 mmol L ‐1 of monosodium phosphate with pH 2.1 allowed the separation of the anesthetics with good peak resolution in less than 5 min. The limits of quantification were 0.31 and 0.68 mg L −1 for lidocaine and benzocaine, respectively. The intra‐ and inter‐day precisions (RSD%) ranged from 1.1 to 4.8% and the accuracies (as recovery percentage) varied from 84 to 109.4%. The proposed method was successfully applied for analyses of commercial samples of pharmaceutical formulations, such as otologic solution, ointment, and spray solution and lozenges for sore throat.