Abstract
The optimal conditions of the formation and extraction of mefenamic acid ion associates with the astrafloxin polymethine dye are studied. The extraction of ion associates with isooctane-dichloroethane mixtures attains a maximum at pH 9–11 and dye concentration of (5–7) × 10−5 M. The Beer law is fulfilled in the range 2.0–21.0 μg/mL; the detection limit for mefenamic acid is 0.72 μg/mL. A method is developed for the extraction-spectrophotometric determination of mefenamic acid in pharmaceutical preparations.
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